{"id":8689,"date":"2020-06-26T11:12:39","date_gmt":"2020-06-26T03:12:39","guid":{"rendered":"http:\/\/dmi65.com\/ky-thuat\/nhung-cau-hoi-thuong-gap\/"},"modified":"2020-06-26T11:12:42","modified_gmt":"2020-06-26T03:12:42","slug":"nhung-cau-hoi-thuong-gap","status":"publish","type":"page","link":"https:\/\/dmi65.com\/vi\/ky-thuat\/nhung-cau-hoi-thuong-gap\/","title":{"rendered":"Nh\u1eefng c\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p"},"content":{"rendered":"

[vc_row][vc_column][vc_column_text]C\u00e1c c\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p s\u1eed d\u1ee5ng DMI-65\u00ae ph\u01b0\u01a1ng ti\u1ec7n x\u1eed tr\u1ecb n\u01b0\u1edbc, \u0111\u1ec3 bi\u1ebft th\u00eam th\u00f4ng tin c\u1ee5 th\u1ec3 xin vui l\u00f2ng li\u00ean h\u1ec7<\/a>[\/vc_column_text][vc_toggle title=”Bao l\u00e2u s\u1ebd DMI-65 cu\u1ed1i c\u00f9ng trong m\u1ed9t h\u1ec7 th\u1ed1ng l\u1ecdc?” style=”simple” color=”peacoc”]N\u1ebfu DMI-65 \u0111\u01b0\u1ee3c duy tr\u00ec v\u00e0 ho\u1ea1t \u0111\u1ed9ng theo c\u00e1c th\u00f4ng s\u1ed1 thi\u1ebft k\u1ebf c\u1ee7a n\u00f3, n\u00f3 s\u1ebd ti\u1ebfp t\u1ee5c lo\u1ea1i b\u1ecf s\u1eaft<\/a> v\u00e0 mangan<\/a> trong t\u1ed1i \u0111a 5 \u2013 10 n\u0103m s\u1eed d\u1ee5ng li\u00ean t\u1ee5c.[\/vc_toggle][vc_toggle title=”DMI-65 k\u00e9o d\u00e0i nh\u01b0 th\u1ebf n\u00e0o?” style=”simple” color=”peacoc”]B\u1edfi v\u00ec DMI-65 kh\u00f4ng \u0111\u01b0\u1ee3c ti\u00eau th\u1ee5 trong qu\u00e1 tr\u00ecnh oxy h\u00f3a ti\u00ean ti\u1ebfn, n\u00f3 \u0111\u01b0\u1ee3c duy tr\u00ec trong m\u1ed9t tr\u1ea1ng th\u00e1i v\u0129nh vi\u1ec5n c\u1ee7a x\u00fac t\u00e1c.[\/vc_toggle][vc_toggle title=”DMI-65 \u0111\u00e3 ho\u1ea1t \u0111\u1ed9ng li\u00ean t\u1ee5c trong 5 -10 n\u0103m. Khi n\u00e0o n\u00f3 s\u1ebd c\u1ea7n thay th\u1ebf?” style=”simple” color=”peacoc”]DMI-65 kh\u00f4ng hi\u1ec3n th\u1ecb kh\u1ea3 n\u0103ng ph\u00e2n r\u00e3 \u0111\u1ec3 l\u00e0m c\u00f4ng vi\u1ec7c x\u00fac t\u00e1c c\u1ee7a n\u00f3. Trong th\u1eddi gian 5 \u0111\u1ebfn 10 n\u0103m, th\u00f4ng qua nhi\u1ec1u chu k\u1ef3 ph\u00eda \u0111\u1ecbnh k\u1ef3, m\u1ed9t m\u1ea5t m\u00e1t c\u1ee7a c\u00e1c ph\u01b0\u01a1ng ti\u1ec7n truy\u1ec1n th\u00f4ng x\u1ea3y ra th\u00f4ng qua m\u00e0i m\u00f2n c\u01a1 kh\u00ed c\u1ee7a c\u00e1c h\u1ea1t li\u00ean l\u1ea1c. N\u1ebfu m\u1ed9t s\u1ef1 s\u1ee5t gi\u1ea3m hi\u1ec7u su\u1ea5t l\u00e0 \u0111\u00e1ng ch\u00fa \u00fd, m\u1ed9t \u0111\u1ea7u \u0111\u01a1n gi\u1ea3n l\u00ean c\u1ee7a c\u00e1c ph\u01b0\u01a1ng ti\u1ec7n truy\u1ec1n th\u00f4ng gi\u01b0\u1eddng s\u1ebd l\u00e0 m\u1ed9t bi\u1ec7n ph\u00e1p kh\u1eafc ph\u1ee5c \u0111\u1ea7y \u0111\u1ee7. \u0110\u00f3 l\u00e0 khuy\u1ebfn c\u00e1o r\u1eb1ng t\u1ea5t c\u1ea3 c\u00e1c b\u1ed9 l\u1ecdc DMI-65 c\u00f3 to\u00e0n b\u1ed9 gi\u01b0\u1eddng ph\u01b0\u01a1ng ti\u1ec7n truy\u1ec1n th\u00f4ng thay th\u1ebf tr\u01b0\u1edbc khi 10 n\u0103m ho\u1ea1t \u0111\u1ed9ng li\u00ean t\u1ee5c, v\u00ec c\u00e1c h\u1ea1t m\u00f2n m\u1ed9t ph\u1ea7n s\u1ebd homogonise v\u1edbi \u0111\u1ea7u trang m\u1edbi l\u00ean ph\u01b0\u01a1ng ti\u1ec7n truy\u1ec1n th\u00f4ng, hi\u1ec7u qu\u1ea3 h\u1ea1n ch\u1ebf hi\u1ec7u su\u1ea5t t\u1ed1i \u0111a c\u1ee7a qu\u00e1 tr\u00ecnh oxy h\u00f3a.[\/vc_toggle][vc_toggle title=”DMI-65 c\u00f3 th\u1ec3 thay th\u1ebf c\u00f4ng ngh\u1ec7 c\u0169, ho\u1eb7c k\u00e9m th\u1ef1c hi\u1ec7n ti\u00eau chu\u1ea9n s\u1eaft v\u00e0 mangan b\u1ed9 l\u1ecdc ph\u01b0\u01a1ng ti\u1ec7n truy\u1ec1n th\u00f4ng?” style=”simple” color=”peacoc”]C\u00e1c ph\u01b0\u01a1ng ti\u1ec7n truy\u1ec1n th\u00f4ng x\u1eed tr\u1ecb n\u01b0\u1edbc DMI-65 l\u00e0 m\u1ed9t s\u1ef1 thay th\u1ebf tr\u1ef1c ti\u1ebfp cho t\u1ea5t c\u1ea3 c\u00e1c ch\u1ea5t x\u00fac t\u00e1c, \u0111a ph\u01b0\u01a1ng ti\u1ec7n, v\u00e0 ti\u00eau chu\u1ea9n silica c\u00e1t l\u1ecdc Medias. N\u00f3 r\u1ea5t d\u1ec5 d\u00e0ng \u0111\u1ec3 thay th\u1ebf v\u00e0 c\u1ea3i thi\u1ec7n hi\u1ec7u su\u1ea5t c\u1ee7a b\u1ea5t k\u1ef3 b\u1ed9 l\u1ecdc. L\u1ee3i \u00edch ti\u1ebft ki\u1ec7m chi ph\u00ed c\u1ee7a vi\u1ec7c gi\u1ea3m h\u00f3a ch\u1ea5t \u0111\u1eaft ti\u1ec1n cho qu\u00e1 tr\u00ecnh oxy h\u00f3a v\u00e0 t\u00e1i t\u1ea1o ph\u01b0\u01a1ng ti\u1ec7n truy\u1ec1n th\u00f4ng s\u1ebd v\u01b0\u1ee3t qu\u00e1 chi ph\u00ed v\u1ed1n ban \u0111\u1ea7u c\u1ee7a ph\u01b0\u01a1ng ti\u1ec7n truy\u1ec1n th\u00f4ng x\u1eed tr\u1ecb n\u01b0\u1edbc DMI-65 v\u00e0 lao \u0111\u1ed9ng th\u00f4ng th\u01b0\u1eddng trong 12 th\u00e1ng \u0111\u1ea7u.[\/vc_toggle][vc_toggle title=”Lo\u1ea1i b\u1ed9 l\u1ecdc n\u00e0o t\u01b0\u01a1ng th\u00edch v\u1edbi DMI-65?” style=”simple” color=”peacoc”]DMI-65 s\u1ebd l\u00e0m vi\u1ec7c trong t\u1ea5t c\u1ea3 c\u00e1c b\u1ed9 l\u1ecdc gi\u01b0\u1eddng s\u00e2u, b\u1ed9 l\u1ecdc \u00e1p su\u1ea5t, b\u1ed9 l\u1ecdc c\u00e1t nhanh v\u00e0 c\u00e1c b\u1ed9 l\u1ecdc c\u00e1t ch\u1eadm. Trong tr\u01b0\u1eddng h\u1ee3p m\u1ed9t gi\u01b0\u1eddng l\u1ecdc s\u00e2u 1000mm l\u00e0 c\u00f3 th\u1ec3, hi\u1ec7u su\u1ea5t v\u01b0\u1ee3t tr\u1ed9i l\u00e0 \u0111\u1ea1t \u0111\u01b0\u1ee3c.[\/vc_toggle][vc_toggle title=”Th\u00f4ng l\u01b0\u1ee3ng t\u1ed1i \u01b0u ho\u1eb7c v\u1eadn t\u1ed1c tuy\u1ebfn t\u00ednh \u0111\u1ec3 lo\u1ea1i b\u1ecf s\u1eaft v\u00e0 mangan v\u1edbi DMI-65 l\u00e0 g\u00ec?” style=”simple” color=”peacoc”]C\u00e1c con s\u1ed1 v\u1eadn t\u1ed1c tuy\u1ebfn t\u00ednh b\u1ea3o th\u1ee7 t\u1eeb 5 \u0111\u1ebfn 10M3\/m2\/gi\u1edd l\u00e0 th\u1ef1c h\u00e0nh ph\u1ed5 bi\u1ebfn cho c\u00e1c \u1ee9ng d\u1ee5ng n\u01b0\u1edbc u\u1ed1ng v\u00e0 \u0111\u1eb7c bi\u1ec7t l\u00e0 \u0111\u1ec3 lo\u1ea1i b\u1ecf mangan. Tuy nhi\u00ean, n\u00f3 \u0111\u00e3 \u0111\u01b0\u1ee3c ch\u1ee9ng minh r\u1eb1ng DMI-65 c\u00f3 th\u1ec3 lo\u1ea1i b\u1ecf c\u00e1c n\u1ed3ng \u0111\u1ed9 ph\u1ed5 bi\u1ebfn c\u1ee7a s\u1eaft v\u00e0 mangan 2 \u0111\u1ebfn 4 l\u1ea7n v\u1eadn t\u1ed1c tuy\u1ebfn t\u00ednh c\u1ee7a Medias ti\u00eau chu\u1ea9n. C\u00f4ng ngh\u1ec7 truy\u1ec1n c\u1ee7a DMI-65 th\u00fac \u0111\u1ea9y t\u1ed1c \u0111\u1ed9 \u00f4xi h\u00f3a cao nh\u1ea5t c\u1ee7a b\u1ea5t k\u1ef3 ph\u01b0\u01a1ng ti\u1ec7n l\u1ecdc x\u00fac t\u00e1c n\u00e0o. \u0110i\u1ec1u n\u00e0y cho ph\u00e9p m\u1ed9t th\u00f4ng l\u01b0\u1ee3ng cao h\u01a1n \u0111\u00e1ng k\u1ec3 m\u00e0 duy tr\u00ec hi\u1ec7u su\u1ea5t mong mu\u1ed1n c\u1ee7a lo\u1ea1i b\u1ecf s\u1eaft v\u00e0 mangan.[\/vc_toggle][vc_toggle title=”L\u00e0m th\u1ebf n\u00e0o th\u01b0\u1eddng xuy\u00ean l\u00e0 chu k\u1ef3 r\u1eeda \u0111\u1ecbnh k\u1ef3 tr\u1edf l\u1ea1i? Bao nhi\u00eau n\u01b0\u1edbc ph\u00eda \u0111\u01b0\u1ee3c chi ti\u00eau?” style=”simple” color=”peacoc”]M\u1ed9t b\u1ed9 l\u1ecdc \u00e1p su\u1ea5t DMI-65 \u0111i\u1ec3n h\u00ecnh c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c t\u1ef1 \u0111\u1ed9ng ho\u00e1 \u0111\u1ec3 l\u00e0m m\u1ed9t chu tr\u00ecnh ph\u00eda \u0111\u1ecbnh k\u1ef3 sau khi t\u00e0u \u0111\u00e3 \u0111\u1ea1t \u0111\u1ebfn m\u1ed9t gi\u1ecdt \u00e1p l\u1ef1c \u0111\u1ea7u c\u1ee7a 50kpa. \u0110\u1ed1i v\u1edbi b\u1ed9 l\u1ecdc c\u00e1t nhanh, vi\u1ec7c r\u1eeda m\u1eb7t n\u00ean \u0111\u01b0\u1ee3c hi\u1ec7u chu\u1ea9n \u0111\u1ebfn th\u1eddi gian c\u1ea7n cho c\u00e1c c\u00e0nh \u0111\u1ea7u ti\u00ean c\u1ee7a s\u1eaft d\u01b0 ho\u1eb7c mangan \u0111\u1ec3 ph\u00e1 v\u1ee1 th\u00f4ng qua. Th\u00f4ng th\u01b0\u1eddng, m\u1ed9t b\u1ed9 l\u1ecdc DMI-65 s\u1ebd ch\u1ec9 c\u1ea7n 10 ph\u00fat chu k\u1ef3 r\u1eeda ng\u01b0\u1ee3c, v\u1edbi v\u1eadn t\u1ed1c t\u1eeb 30 \u0111\u1ebfn 40m3\/m2\/gi\u1edd, m\u1ed7i 24 \u0111\u1ebfn 48 gi\u1edd.[\/vc_toggle][vc_toggle title=”DMI-65 c\u00f3 th\u1ec3 lo\u1ea1i b\u1ecf c\u00e1c kim lo\u1ea1i h\u00f2a tan kh\u00e1c kh\u00f4ng?” style=”simple” color=”peacoc”]Ph\u01b0\u01a1ng ti\u1ec7n x\u1eed tr\u1ecb n\u01b0\u1edbc DMI-65 \u0111\u00e3 \u0111\u01b0\u1ee3c ch\u1ee9ng minh l\u00e0 c\u00f3 hi\u1ec7u qu\u1ea3 lo\u1ea1i b\u1ecf nh\u00f4m v\u00e0 asen<\/a>. C\u00e1c x\u00e9t nghi\u1ec7m trong ph\u00f2ng th\u00ed nghi\u1ec7m g\u1ea7n \u0111\u00e2y c\u0169ng \u0111\u00e3 ch\u1ee9ng minh c\u00e1c ph\u01b0\u01a1ng ti\u1ec7n x\u1eed tr\u1ecb n\u01b0\u1edbc r\u1ea5t hi\u1ec7u qu\u1ea3 trong vi\u1ec7c oxy h\u00f3a v\u00e0 duy tr\u00ec s\u1ef1 k\u1ebft t\u1ee7a \u0111\u1ed3ng, ch\u00ec v\u00e0 k\u1ebdm, cho th\u1ea5y DMI-65 c\u00f3 ph\u1ea1m vi s\u1eed d\u1ee5ng r\u1ed9ng h\u01a1n so v\u1edbi d\u1ef1 \u0111\u1ecbnh ban \u0111\u1ea7u.[\/vc_toggle][vc_toggle title=”C\u00f3 th\u1ec3 DMI-65 lo\u1ea1i b\u1ecf hydro sulphide?” style=”simple” color=”peacoc”]DMI-65 h\u1ea7u nh\u01b0 c\u00f3 th\u1ec3 lo\u1ea1i b\u1ecf t\u1ea5t c\u1ea3 hydro sulphide n\u01a1i th\u1ef1c t\u1ebf. H\u1ec7 th\u1ed1ng l\u1ecdc DMI-65 t\u1ea1o ra m\u1ed9t b\u1ed3n t\u1eafm c\u1ee7a n\u01b0\u1edbc b\u1ecb \u00f4xi h\u00f3a, v\u00e0 ch\u1ea3y t\u1eeb tr\u00ean \u0111\u1ec9nh th\u00e1p th\u00f4ng qua m\u1ed9t bu\u1ed3ng x\u00fac t\u00e1c v\u00e0 n\u01b0\u1edbc b\u1ecb \u00f4xi h\u00f3a, sau \u0111\u00f3 ra th\u00f4ng qua d\u01b0\u1edbi c\u00f9ng c\u1ee7a \u0111i\u1ec7n tho\u1ea1i. Hydrogen sulphide ph\u1ea3n \u1ee9ng v\u1edbi n\u01b0\u1edbc \u00f4xi h\u00f3a v\u00e0 sau \u0111\u00f3 \u0111\u01b0\u1ee3c chuy\u1ec3n \u0111\u1ed5i th\u00e0nh nguy\u00ean t\u1ed1 Sulphur v\u00e0 s\u1eaft sulphide. Hi\u1ec7n nay kh\u00f4ng h\u00f2a tan Sulphur t\u1ea1o ra \u0111\u01b0\u1ee3c l\u1ea5y ra kh\u1ecfi n\u01b0\u1edbc b\u1eb1ng c\u00e1ch l\u1ecdc c\u01a1 kh\u00ed v\u1edbi DMI-65. Khi l\u01b0u hu\u1ef3nh ion \u0111\u1ebfn li\u00ean l\u1ea1c v\u1edbi ph\u1ee9c h\u1ee3p s\u1eaft ferric, n\u00f3 b\u1ecb \u00f4xi h\u00f3a th\u00e0nh nguy\u00ean t\u1ed1 Sulphur v\u00e0 \u0111\u01b0\u1ee3c k\u1ebft t\u1ee7a.[\/vc_toggle][vc_toggle title=”DMI-65 c\u00f3 th\u1ec3 lo\u1ea1i b\u1ecf asen?” style=”simple” color=”peacoc”]Trong tr\u01b0\u1eddng h\u1ee3p x\u1eed tr\u1ecb n\u01b0\u1edbc u\u1ed1ng khi y\u00eau c\u1ea7u l\u00e0 gi\u1ea3m asen xu\u1ed1ng m\u1ed9t v\u00e0i ph\u1ea7n t\u1ef7, c\u00e1c c\u00f4ng ngh\u1ec7 \u00e1p d\u1ee5ng \u0111\u01b0\u1ee3c gi\u1edbi h\u1ea1n. Lo\u1ea1i b\u1ecf asen chi ph\u00ed th\u1ea5p t\u1eeb n\u01b0\u1edbc u\u1ed1ng c\u00f3 kh\u1ea3 n\u0103ng b\u1ecb gi\u1edbi h\u1ea1n \u1edf l\u01b0\u1ee3ng m\u01b0a v\u00e0 h\u1ea5p ph\u1ee5. DMI-65 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng l\u00e0m v\u1eadt li\u1ec7u x\u00fac t\u00e1c \u0111\u1ec3 l\u1ecdc c\u00e1c k\u1ebft t\u1ee7a asen. S\u1ef1 h\u1ea5p th\u1ee5 t\u1ed1i \u01b0u c\u1ee7a asen (III) tr\u00ean ferrihydrit x\u1ea3y ra \u1edf pH 8-9. V\u00ec v\u1eady, n\u00f3 \u0111\u01b0\u1ee3c hi\u1ec3u b\u1eb1ng c\u00e1ch gi\u1edbi thi\u1ec7u m\u1ed9t \u0111\u1ea1i l\u00fd l\u1eafng \u0111\u1ecdng nh\u01b0 dung l\u01b0\u1ee3ng ferric clorua \u1edf t\u1ef7 l\u1ec7 t\u1eadp trung l\u00ean \u0111\u1ebfn 50 b\u1ed9 ph\u1eadn ferric clorua nh\u01b0 s\u1eaft \u0111\u1ebfn m\u1ed9t ph\u1ea7n asen, s\u1ebd \u00e1p \u0111\u1ea3o c\u00e1c asen \u0111\u1ec3 t\u1ea1o th\u00e0nh m\u1ed9t ph\u1ee9c t\u1ea1p v\u1edbi s\u1eaft. Ch\u00fang t\u00f4i s\u1eed d\u1ee5ng FeCl3 \u0111\u1ec3 t\u1ea1o th\u00e0nh m\u1ed9t tr\u00e1i phi\u1ebfu v\u1edbi asen, v\u00e0 nh\u01b0 DMI-65 c\u00f3 hi\u1ec7u qu\u1ea3 lo\u1ea1i b\u1ecf s\u1eaft cao, c\u00f3 th\u1ec3 lo\u1ea1i b\u1ecf asen th\u00f4ng qua vi\u1ec7c duy tr\u00ec asen k\u1ebft t\u1ee7a \u0111\u00e3 h\u00ecnh th\u00e0nh m\u1ed9t ph\u1ee9c h\u1ee3p v\u1edbi s\u1eaft \u0111\u01b0\u1ee3c gi\u1edbi thi\u1ec7u t\u1eeb clorua ferric[\/vc_toggle][vc_toggle title=”DMI-65 b\u1ea3o v\u1ec7 m\u00e0ng th\u1ea9m th\u1ea5u ng\u01b0\u1ee3c nh\u01b0 th\u1ebf n\u00e0o?” style=”simple” color=”peacoc”]Vi\u1ec7c lo\u1ea1i b\u1ecf hi\u1ec7u qu\u1ea3 c\u1ee7a s\u1eaft h\u00f2a tan v\u00e0 mangan \u0111\u1ebfn m\u1ee9c g\u1ea7n nh\u01b0 kh\u00f4ng th\u1ec3 ph\u00e1t hi\u1ec7n th\u1ea5p nh\u01b0 0.001 mg\/L v\u1eadt ch\u1ea5t l\u00e0m gi\u1ea3m t\u1ef7 l\u1ec7 m\u1eafc c\u1ee7a Bio-fouling c\u1ee7a m\u00e0ng RO \u1edf h\u1ea1 l\u01b0u. \u0110i\u1ec1u n\u00e0y l\u00e0m gi\u1ea3m s\u1ef1 c\u1ea7n thay th\u1ebf m\u00e0ng v\u00e0 gi\u1eef cho c\u00e1c h\u1ec7 th\u1ed1ng x\u1eed tr\u1ecb l\u00e0m vi\u1ec7c \u1edf m\u1ee9c t\u1ed1i \u01b0u. Ti\u1ebft ki\u1ec7m hi\u1ec7u qu\u1ea3 s\u1ea3n xu\u1ea5t v\u00e0 chi ph\u00ed thay th\u1ebf m\u00e0ng v\u00e0 ho\u1ea1t \u0111\u1ed9ng downtime.[\/vc_toggle][vc_toggle title=”DMI-65 c\u00f3 c\u1ea3i thi\u1ec7n m\u00e0u s\u1eafc v\u00e0 m\u00f9i kh\u00f4ng?” style=”simple” color=”peacoc”]Trong tr\u01b0\u1eddng h\u1ee3p nghi\u00ean c\u1ee9u c\u1ee7a nh\u00e0 m\u00e1y x\u1eed tr\u1ecb n\u01b0\u1edbc th\u00e0nh ph\u1ed1 \u1edf Nam Phi, n\u01b0\u1edbc m\u00e1y \u1edf th\u1ecb tr\u1ea5n George n\u1ed5i ti\u1ebfng v\u1edbi m\u00e0u s\u1eafc kh\u00f3 coi, m\u00f9i, v\u00e0 h\u01b0\u01a1ng v\u1ecb do “kh\u00f3 kh\u0103n \u0111\u1ec3 lo\u1ea1i b\u1ecf” axit humic v\u00e0 Fulvic trong n\u01b0\u1edbc th\u00f4. Sau khi \u0111\u01b0\u1ee3c DMI-65 \u0111i\u1ec1u tr\u1ecb, m\u00e0u s\u1eafc, m\u00f9i v\u00e0 h\u01b0\u01a1ng v\u1ecb c\u1ee7a n\u01b0\u1edbc c\u00f3 ch\u1ea5t l\u01b0\u1ee3ng t\u1ed1t h\u01a1n so v\u1edbi n\u01b0\u1edbc kh\u1eed kho\u00e1ng \u0111\u01b0\u1ee3c th\u1eed nghi\u1ec7m t\u1ea1i hi\u1ec7u thu\u1ed1c \u0111\u1ecba ph\u01b0\u01a1ng.[\/vc_toggle][vc_toggle title=”S\u1eaft lo\u1ea1i b\u1ecf OK, nh\u01b0ng kh\u00f4ng mong mu\u1ed1n mangan lo\u1ea1i b\u1ecf?” style=”simple” color=”peacoc”]Mangan l\u00e0 m\u1ed9t y\u1ebfu t\u1ed1 kh\u00f3 kh\u0103n h\u01a1n nhi\u1ec1u \u0111\u1ec3 lo\u1ea1i b\u1ecf h\u01a1n s\u1eaft. Qu\u00e1 tr\u00ecnh oxy h\u00f3a l\u00e0 pH ph\u1ee5 thu\u1ed9c v\u00e0 l\u1ee3i \u00edch t\u1eeb th\u1eddi gian giam gi\u1eef l\u1edbn h\u01a1n v\u1edbi ch\u1ea5t x\u00fac t\u00e1c oxy h\u00f3a DMI-65. B\u1eb1ng c\u00e1ch t\u0103ng pH c\u00e0ng g\u1ea7n 8, gi\u1ea3m v\u1eadn t\u1ed1c th\u00f4ng v\u00e0 t\u0103ng tuy\u1ebfn t\u00ednh qua \u0111\u1ed9 s\u00e2u c\u1ee7a gi\u01b0\u1eddng l\u1ecdc, mangan \u0111\u1ed3ng th\u1eddi \u0111\u01b0\u1ee3c lo\u1ea1i b\u1ecf b\u1eb1ng s\u1eaft \u0111\u1ebfn m\u1ee9c g\u1ea7n nh\u01b0 kh\u00f4ng th\u1ec3 ph\u00e1t hi\u1ec7n \u0111\u01b0\u1ee3c 0.001 mg\/L.[\/vc_toggle][vc_toggle title=”Sau khi m\u1ed9t backwash \u0111\u1ecbnh k\u1ef3, s\u1eaft v\u00e0 mangan lo\u1ea1i b\u1ecf \u0111\u01b0\u1ee3c ch\u1ea5p nh\u1eadn trong m\u1ed9t v\u00e0i gi\u1edd, sau \u0111\u00f3 ph\u00e1 v\u1ee1 d\u01b0 qua li\u00ean t\u1ee5c x\u1ea3y ra?” style=”simple” color=”peacoc”]\u0110\u00e2y l\u00e0 d\u1ea5u hi\u1ec7u cho bi\u1ebft-tale r\u1eb1ng v\u1eadn t\u1ed1c ph\u00eda kh\u00f4ng \u0111\u1ee7 m\u1ea1nh \u0111\u1ec3 ho\u00e0n to\u00e0n fluidise c\u1ee7a t\u1ed5ng s\u1ed1 gi\u01b0\u1eddng l\u1ecdc. K\u1ebft t\u1ee7a mangan s\u1ebd \u0111\u1eb7t c\u1ecdc \u1edf d\u01b0\u1edbi c\u00f9ng c\u1ee7a gi\u01b0\u1eddng l\u1ecdc, thay v\u00ec \u0111\u01b0\u1ee3c ph\u00e1t h\u00e0nh v\u00e0o ch\u1ea5t th\u1ea3i v\u00e0 ph\u00e1 v\u1ee1 th\u00f4ng qua x\u1ea3y ra s\u1edbm. \u0110\u1ed1i v\u1edbi \u0111\u1ed9 s\u00e2u gi\u01b0\u1eddng 700 \u2013 800mm, m\u1ed9t v\u1eadn t\u1ed1c ph\u00eda 30m3\/m2\/gi\u1edd l\u00e0 \u0111\u1ee7 \u0111\u1ec3 ho\u00e0n to\u00e0n fluidise gi\u01b0\u1eddng \u0111\u1ec3 m\u1edf r\u1ed9ng 50 gi\u01b0\u1eddng l\u00e0 \u0111\u1ea1t \u0111\u01b0\u1ee3c. \u0110\u1ed1i v\u1edbi gi\u01b0\u1eddng s\u00e2u h\u01a1n nh\u01b0 1000mm, m\u1ed9t v\u1eadn t\u1ed1c ph\u00eda c\u1ee7a 40m3\/m2\/gi\u1edd l\u00e0 c\u1ea7n thi\u1ebft \u0111\u1ec3 ph\u00e1t h\u00e0nh m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3 c\u00e1c k\u1ebft t\u1ee7a \u0111\u1ec3 l\u00e3ng ph\u00ed.[\/vc_toggle][vc_toggle title=”Bao l\u00e2u s\u1ebd DMI-65 cu\u1ed1i c\u00f9ng trong m\u1ed9t h\u1ec7 th\u1ed1ng l\u1ecdc?” style=”simple” color=”peacoc”]N\u1ebfu DMI-65 \u0111\u01b0\u1ee3c duy tr\u00ec v\u00e0 ho\u1ea1t \u0111\u1ed9ng theo c\u00e1c th\u00f4ng s\u1ed1 thi\u1ebft k\u1ebf c\u1ee7a n\u00f3, n\u00f3 s\u1ebd ti\u1ebfp t\u1ee5c lo\u1ea1i b\u1ecf s\u1eaft v\u00e0 mangan trong t\u1ed1i \u0111a 5 \u2013 10 n\u0103m s\u1eed d\u1ee5ng li\u00ean t\u1ee5c.[\/vc_toggle][vc_toggle title=”PH t\u1ed1t nh\u1ea5t cho s\u1eaft v\u00e0 mangan lo\u1ea1i b\u1ecf v\u1edbi DMI-65 l\u00e0 g\u00ec?” style=”simple” color=”peacoc”]Trong khi DMI-65 c\u00f3 ph\u1ea1m vi pH r\u1ed9ng \u0111\u1ec3 lo\u1ea1i b\u1ecf s\u1eaft. Lo\u1ea1i b\u1ecf c\u1ea3 hai k\u1ebft t\u1ee7a \u0111\u1ed3ng th\u1eddi c\u00f3 th\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c hi\u1ec7u su\u1ea5t cao trong n\u01b0\u1edbc h\u01a1i c\u01a1 b\u1ea3n v\u00e0 t\u1ed1t nh\u1ea5t l\u00e0 g\u1ea7n pH 8 c\u00e0ng t\u1ed1t.[\/vc_toggle][vc_toggle title=”DMI-65 c\u00f3 th\u1ec3 th\u1ef1c hi\u1ec7n trong n\u01b0\u1edbc m\u1eb7n kh\u00f4ng?” style=”simple” color=”peacoc”]DMI-65 c\u00f3 dung sai cho n\u01b0\u1edbc l\u1ee3 \u0111\u01b0\u1ee3c gi\u1edbi h\u1ea1n \u1edf kho\u1ea3ng 1000mg\/L. Lo\u1ea1i b\u1ecf s\u1eaft hi\u1ec7u qu\u1ea3 c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c duy tr\u00ec trong nhi\u1ec1u n\u0103m, Tuy nhi\u00ean mu\u1ed1i s\u1ebd quy m\u00f4 v\u00e0 t\u1ea1o th\u00e0nh m\u1ed9t l\u1edbp v\u1ecf tr\u00ean b\u1ec1 m\u1eb7t x\u00fac t\u00e1c. S\u1ef1 d\u1eabn \u0111i\u1ec7n cao v\u00e0 n\u1ed3ng \u0111\u1ed9 m\u1eb7n c\u1ee7a n\u01b0\u1edbc bi\u1ec3n s\u1ebd kh\u00f4ng cho ph\u00e9p c\u00e1c b\u1ec1 m\u1eb7t x\u00fac t\u00e1c c\u1ee7a DMI-65 t\u01b0\u01a1ng t\u00e1c v\u1edbi c\u00e1c kim lo\u1ea1i m\u1ee5c ti\u00eau v\u00e0 b\u1ea5t l\u1ee3i c\u1ee7a DMI-65 s\u1ebd l\u00e0m suy gi\u1ea3m nhanh ch\u00f3ng.[\/vc_toggle][vc_toggle title=”C\u00f3 th\u1ec3 DMI-65 ho\u1ea1t \u0111\u1ed9ng trong n\u01b0\u1edbc \u0103n m\u00f2n cao ho\u1eb7c c\u1ee9ng?” style=”simple” color=”peacoc”]C\u00e1c h\u00f3a h\u1ecdc ti\u00eau c\u1ef1c li\u00ean quan \u0111\u1ebfn n\u01b0\u1edbc \u0103n m\u00f2n cao do \u0111\u1ed9 pH th\u1ea5p v\u00e0 \u0111\u1ed9 c\u1ee9ng qu\u00e1 m\u1ee9c c\u1ea7n ph\u1ea3i \u0111\u01b0\u1ee3c gi\u1ea3i quy\u1ebft v\u00ec n\u00f3 s\u1ebd l\u00e0m h\u1ecfng DMI-65 v\u00e0 h\u1ea7u h\u1ebft c\u00e1c thi\u1ebft b\u1ecb ho\u1ea1t \u0111\u1ed9ng.[\/vc_toggle][vc_toggle title=”M\u1ee5c \u0111\u00edch c\u1ee7a \u0111i\u1ec1u h\u00f2a v\u00e0 ng\u00e2m DMI-65 khi b\u1eaft \u0111\u1ea7u l\u00ean?” style=”simple” color=”peacoc”]C\u00f3 m\u1ed9t l\u1ee3i th\u1ebf qu\u00e1 tr\u00ecnh h\u00f3a h\u1ecdc h\u1ea5p d\u1eabn \u0111\u1ec3 b\u1ea3o d\u01b0\u1ee1ng m\u1ea1nh m\u1ebd c\u1ee7a c\u00e1c b\u1ec1 m\u1eb7t x\u00fac t\u00e1c DMI-65-b\u1eb1ng c\u00e1ch ng\u00e2m c\u00e1c ph\u01b0\u01a1ng ti\u1ec7n truy\u1ec1n th\u00f4ng l\u1ecdc n\u01b0\u1edbc \u00edt nh\u1ea5t 3 gi\u1edd tr\u01b0\u1edbc khi s\u1eed d\u1ee5ng. L\u00fd t\u01b0\u1edfng h\u01a1n th\u1eddi gian ng\u00e2m v\u00e0 \u0111i\u1ec1u h\u00f2a l\u00e0, m\u1ea1nh m\u1ebd h\u01a1n v\u00e0 kh\u00f3 kh\u0103n h\u01a1n c\u00e1c b\u1ec1 m\u1eb7t x\u00fac t\u00e1c tr\u1edf th\u00e0nh.[\/vc_toggle][vc_toggle title=”T\u1ea1i sao duy tr\u00ec m\u1ed9t m\u1ee9c \u0111\u1ed9 d\u01b0 clo c\u1ee7a 0,1-03mg\/L khi s\u1eed d\u1ee5ng DMI-65?” style=”simple” color=”peacoc”]DMI-65 ch\u1ec9 \u0111\u00f2i h\u1ecfi l\u01b0\u1ee3ng clo nh\u1ecf ch\u00ednh x\u00e1c \u0111\u1ec3 kh\u1eed tr\u00f9ng \u0111\u1ec3 gi\u1eef cho b\u1ec1 m\u1eb7t x\u00fac t\u00e1c s\u1ea1ch, trong tr\u1ea1ng th\u00e1i t\u1ef1 \u0111\u1ed9ng x\u00fac t\u00e1c li\u00ean t\u1ee5c c\u1ee7a qu\u00e1 tr\u00ecnh oxy h\u00f3a v\u00e0 thu h\u00fat ch\u1ea5t keo s\u1eaft v\u00e0 mangan. L\u01b0\u1ee3ng clo d\u01b0 nh\u1ecf n\u00e0y c\u0169ng ph\u00f9 h\u1ee3p thu\u1eadn ti\u1ec7n v\u1edbi h\u01b0\u1edbng d\u1eabn n\u01b0\u1edbc u\u1ed1ng c\u1ee7a t\u1ed5 ch\u1ee9c y t\u1ebf th\u1ebf gi\u1edbi v\u00e0 \u0111\u01b0\u1ee3c ch\u1ea5p thu\u1eadn v\u00e0 ch\u1ee9ng nh\u1eadn t\u01b0\u01a1ng t\u1ef1.[\/vc_toggle][vc_toggle title=”C\u00f3 th\u1ec3 DMI-65 x\u1eed l\u00fd n\u01b0\u1edbc th\u00f4 v\u1edbi 3mg\/L c\u1ee7a mangan?” style=”simple” color=”peacoc”]DMI-65 l\u00e0 ph\u01b0\u01a1ng ti\u1ec7n truy\u1ec1n th\u00f4ng x\u00fac t\u00e1c hi\u1ec7u qu\u1ea3 nh\u1ea5t cho oxidising v\u00e0 lo\u1ea1i b\u1ecf c\u00e1c ch\u1ea5t g\u00e2y \u00f4 nhi\u1ec5m g\u00e2y kh\u00f3 hi\u1ec3u n\u1ed5i ti\u1ebfng v\u00e0 cao. Qu\u00e1 tr\u00ecnh oxy h\u00f3a m\u1ea1nh m\u1ebd c\u1ee7a \u0111\u1eb7c \u0111i\u1ec3m DMI-65 \u0111\u01b0\u1ee3c so s\u00e1nh v\u1edbi ozon ho\u1eb7c peroxide. V\u1edbi m\u1ed9t l\u01b0\u1ee3ng nh\u1ecf clo v\u00e0 s\u1ef1 ch\u00fa \u00fd \u0111\u1ebfn pH, mangan kh\u00f3 kh\u0103n \u0111\u01b0\u1ee3c lo\u1ea1i b\u1ecf \u0111\u1ec3 th\u01b0\u1eddng \u00edt h\u01a1n 0.001 mg\/L.[\/vc_toggle][vc_toggle title=”DMI-65 c\u00f3 th\u1ec3 x\u1eed l\u00fd n\u01b0\u1edbc th\u00f4 v\u1edbi 50mg\/L c\u1ee7a s\u1eaft?” style=”simple” color=”peacoc”]N\u00f3 r\u1ea5t d\u1ec5 d\u00e0ng \u0111\u1ec3 \u0111i\u1ec1u tr\u1ecb v\u00f9ng n\u01b0\u1edbc n\u1ed3ng \u0111\u1ed9 s\u1eaft cao b\u1eb1ng c\u00e1ch oxy h\u00f3a tr\u01b0\u1edbc n\u01b0\u1edbc th\u00f4 tr\u01b0\u1edbc khi l\u1ecdc v\u1edbi DMI-65. \u0110\u00f3 l\u00e0, v\u00ed d\u1ee5, r\u1ea5t d\u1ec5 d\u00e0ng \u0111\u1ec3 oxy h\u00f3a h\u00f3a h\u1ecdc, \u0111\u00f4ng t\u1ee5 v\u00e0 t\u00e1ch 90 c\u1ee7a t\u1ed5ng s\u1ed1 s\u1eaft trong m\u1ed9t b\u1ec3 giam trong v\u00e0i ph\u00fat. N\u00f3 \u0111\u1ebfn nay kh\u00f3 kh\u0103n h\u01a1n \u0111\u1ec3 lo\u1ea1i b\u1ecf c\u00e1c 10 c\u00f2n l\u1ea1i c\u1ee7a t\u1ed5ng s\u1ed1 s\u1eaft \u0111\u1ebfn m\u1ee9c g\u1ea7n nh\u01b0 kh\u00f4ng th\u1ec3 ph\u00e1t hi\u1ec7n. \u0110\u00e2y l\u00e0 l\u00fd do t\u1ea1i sao DMI-65 \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1ec3 c\u00f3 m\u1ed9t hi\u1ec7u su\u1ea5t cao, ph\u01b0\u01a1ng ph\u00e1p chi ph\u00ed th\u1ea5p c\u1ee7a lo\u1ea1i b\u1ecf s\u1eaft th\u01b0\u1eddng \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 “\u0111\u00e1nh b\u00f3ng s\u1eaft DMI-65″.[\/vc_toggle][vc_toggle title=”DMI-65 s\u1ebd lo\u1ea1i b\u1ecf s\u1eaft v\u00e0 mangan trong n\u01b0\u1edbc \u0111\u1ed9 \u0111\u1ee5c cao?” style=”simple” color=”peacoc”]C\u00e1c v\u1ea5n \u0111\u1ec1 ch\u00ednh v\u1edbi \u0111\u1ed9 \u0111\u1ee5c l\u00e0 n\u00f3 g\u00e2y ra v\u1ea5n \u0111\u1ec1 v\u1edbi qu\u00e1 tr\u00ecnh kh\u1eed tr\u00f9ng, m\u00e0 l\u1ea7n l\u01b0\u1ee3t c\u00f3 th\u1ec3 cho ph\u00e9p c\u00e1c vi khu\u1ea9n s\u1eaft \u0111\u1ec3 trang tr\u1ea3i c\u00e1c b\u1ec1 m\u1eb7t c\u1ee7a c\u00e1c ph\u01b0\u01a1ng ti\u1ec7n truy\u1ec1n th\u00f4ng l\u1ecdc n\u01b0\u1edbc, gi\u1ea3m hi\u1ec7u su\u1ea5t c\u1ee7a qu\u00e1 tr\u00ecnh oxy h\u00f3a.[\/vc_toggle][vc_toggle title=”DMI-65 c\u00f3 th\u1ec3 x\u1eed l\u00fd n\u01b0\u1edbc th\u00f4 v\u1edbi 50mg\/L c\u1ee7a s\u1eaft?” style=”simple” color=”peacoc”]N\u00f3 r\u1ea5t d\u1ec5 d\u00e0ng \u0111\u1ec3 \u0111i\u1ec1u tr\u1ecb v\u00f9ng n\u01b0\u1edbc n\u1ed3ng \u0111\u1ed9 s\u1eaft cao b\u1eb1ng c\u00e1ch oxy h\u00f3a tr\u01b0\u1edbc n\u01b0\u1edbc th\u00f4 tr\u01b0\u1edbc khi l\u1ecdc v\u1edbi DMI-65. \u0110\u00f3 l\u00e0, v\u00ed d\u1ee5, r\u1ea5t d\u1ec5 d\u00e0ng \u0111\u1ec3 oxy h\u00f3a h\u00f3a h\u1ecdc, \u0111\u00f4ng t\u1ee5 v\u00e0 t\u00e1ch 90 c\u1ee7a t\u1ed5ng s\u1ed1 s\u1eaft trong m\u1ed9t b\u1ec3 giam trong v\u00e0i ph\u00fat. N\u00f3 \u0111\u1ebfn nay kh\u00f3 kh\u0103n h\u01a1n \u0111\u1ec3 lo\u1ea1i b\u1ecf c\u00e1c 10 c\u00f2n l\u1ea1i c\u1ee7a t\u1ed5ng s\u1ed1 s\u1eaft \u0111\u1ebfn m\u1ee9c g\u1ea7n nh\u01b0 kh\u00f4ng th\u1ec3 ph\u00e1t hi\u1ec7n. \u0110\u00e2y l\u00e0 l\u00fd do t\u1ea1i sao DMI-65 \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1ec3 c\u00f3 m\u1ed9t hi\u1ec7u su\u1ea5t cao, ph\u01b0\u01a1ng ph\u00e1p chi ph\u00ed th\u1ea5p c\u1ee7a lo\u1ea1i b\u1ecf s\u1eaft th\u01b0\u1eddng \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 “\u0111\u00e1nh b\u00f3ng s\u1eaft DMI-65″.[\/vc_toggle][vc_toggle title=”C\u00f3 th\u1ec3 DMI-65 x\u1eed l\u00fd n\u01b0\u1edbc th\u00f4 v\u1edbi 3mg\/L c\u1ee7a mangan?” style=”simple” color=”peacoc”]DMI-65 l\u00e0 ph\u01b0\u01a1ng ti\u1ec7n truy\u1ec1n th\u00f4ng x\u00fac t\u00e1c hi\u1ec7u qu\u1ea3 nh\u1ea5t cho oxidising v\u00e0 lo\u1ea1i b\u1ecf c\u00e1c ch\u1ea5t g\u00e2y \u00f4 nhi\u1ec5m g\u00e2y kh\u00f3 hi\u1ec3u n\u1ed5i ti\u1ebfng v\u00e0 cao. Qu\u00e1 tr\u00ecnh oxy h\u00f3a m\u1ea1nh m\u1ebd c\u1ee7a \u0111\u1eb7c \u0111i\u1ec3m DMI-65 \u0111\u01b0\u1ee3c so s\u00e1nh v\u1edbi ozon ho\u1eb7c peroxide. V\u1edbi m\u1ed9t l\u01b0\u1ee3ng nh\u1ecf clo v\u00e0 s\u1ef1 ch\u00fa \u00fd \u0111\u1ebfn pH, mangan kh\u00f3 kh\u0103n \u0111\u01b0\u1ee3c lo\u1ea1i b\u1ecf \u0111\u1ec3 th\u01b0\u1eddng \u00edt h\u01a1n 0.001 mg\/L.[\/vc_toggle][vc_toggle title=”T\u1ea1i sao duy tr\u00ec m\u1ed9t m\u1ee9c \u0111\u1ed9 d\u01b0 clo c\u1ee7a 0,1-03mg\/L khi s\u1eed d\u1ee5ng DMI-65?” style=”simple” color=”peacoc”]DMI-65 ch\u1ec9 \u0111\u00f2i h\u1ecfi l\u01b0\u1ee3ng clo nh\u1ecf ch\u00ednh x\u00e1c \u0111\u1ec3 kh\u1eed tr\u00f9ng \u0111\u1ec3 gi\u1eef cho b\u1ec1 m\u1eb7t x\u00fac t\u00e1c s\u1ea1ch, trong tr\u1ea1ng th\u00e1i t\u1ef1 \u0111\u1ed9ng x\u00fac t\u00e1c li\u00ean t\u1ee5c c\u1ee7a qu\u00e1 tr\u00ecnh oxy h\u00f3a v\u00e0 thu h\u00fat ch\u1ea5t keo s\u1eaft v\u00e0 mangan. L\u01b0\u1ee3ng clo d\u01b0 nh\u1ecf n\u00e0y c\u0169ng ph\u00f9 h\u1ee3p thu\u1eadn ti\u1ec7n v\u1edbi h\u01b0\u1edbng d\u1eabn n\u01b0\u1edbc u\u1ed1ng c\u1ee7a t\u1ed5 ch\u1ee9c y t\u1ebf th\u1ebf gi\u1edbi v\u00e0 \u0111\u01b0\u1ee3c ch\u1ea5p thu\u1eadn v\u00e0 ch\u1ee9ng nh\u1eadn t\u01b0\u01a1ng t\u1ef1.[\/vc_toggle][vc_toggle title=”M\u1ee5c \u0111\u00edch c\u1ee7a \u0111i\u1ec1u h\u00f2a v\u00e0 ng\u00e2m DMI-65 khi b\u1eaft \u0111\u1ea7u l\u00ean?” style=”simple” color=”peacoc”]C\u00f3 m\u1ed9t l\u1ee3i th\u1ebf qu\u00e1 tr\u00ecnh h\u00f3a h\u1ecdc h\u1ea5p d\u1eabn \u0111\u1ec3 b\u1ea3o d\u01b0\u1ee1ng m\u1ea1nh m\u1ebd c\u1ee7a c\u00e1c b\u1ec1 m\u1eb7t x\u00fac t\u00e1c DMI-65-b\u1eb1ng c\u00e1ch ng\u00e2m c\u00e1c ph\u01b0\u01a1ng ti\u1ec7n truy\u1ec1n th\u00f4ng l\u1ecdc n\u01b0\u1edbc \u00edt nh\u1ea5t 3 gi\u1edd tr\u01b0\u1edbc khi s\u1eed d\u1ee5ng. L\u00fd t\u01b0\u1edfng h\u01a1n th\u1eddi gian ng\u00e2m v\u00e0 \u0111i\u1ec1u h\u00f2a l\u00e0, m\u1ea1nh m\u1ebd h\u01a1n v\u00e0 kh\u00f3 kh\u0103n h\u01a1n c\u00e1c b\u1ec1 m\u1eb7t x\u00fac t\u00e1c tr\u1edf th\u00e0nh.[\/vc_toggle][vc_toggle title=”Oxy h\u00f3a kh\u00e1c c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng kh\u00e1c h\u01a1n so v\u1edbi clo?” style=”simple” color=”peacoc”]C\u00f3 th\u1ec3 s\u1eed d\u1ee5ng hi\u1ec7u qu\u1ea3 c\u00e1c ch\u1ea5t oxy h\u00f3a kh\u00e1c nh\u01b0 ozone, hydrogen peroxide, kali permanganat, th\u1eadm ch\u00ed oxy h\u00f2a tan v\u1edbi m\u1ed9t soda \u0103n da nh\u1ecf \u0111\u1ebfn \u0111\u1ecba ch\u1ec9 kh\u1eed tr\u00f9ng. Tuy nhi\u00ean, m\u1ed9t s\u1ef1 hi\u1ec3u bi\u1ebft t\u1ed1t v\u1ec1 s\u1ef1 \u1ed5n \u0111\u1ecbnh c\u1ee7a oxy h\u00f3a \u0111\u01b0\u1ee3c l\u1ef1a ch\u1ecdn s\u1eed d\u1ee5ng l\u00e0 c\u1ea7n thi\u1ebft \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o lu\u00f4n c\u00f3 m\u1ed9t oxy h\u00f3a c\u00f2n l\u1ea1i duy tr\u00ec. Sodium hypochlorite l\u00e0 d\u1ec5 nh\u1ea5t, h\u1ea7u h\u1ebft c\u00e1c ph\u01b0\u01a1ng ph\u00e1p th\u1ef1c t\u1ebf v\u00e0 chi ph\u00ed th\u1ea5p nh\u1ea5t \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o kh\u1eed tr\u00f9ng kh\u00f4ng b\u1ecb t\u1ed5n h\u1ea1i.[\/vc_toggle][vc_toggle title=”Ph\u01b0\u01a1ng ti\u1ec7n truy\u1ec1n th\u00f4ng c\u00f3 th\u1ec3 b\u1ecb h\u01b0 h\u1ecfng kh\u00f4ng?” style=”simple” color=”peacoc”]C\u00f3, c\u00f3 th\u1ec3 l\u00e0 ph\u01b0\u01a1ng ti\u1ec7n truy\u1ec1n th\u00f4ng x\u1eed tr\u1ecb n\u01b0\u1edbc c\u00f3 th\u1ec3 tho\u00e1i h\u00f3a do thi\u1ebfu oxy h\u00f2a tan hi\u1ec7n nay \u1edf b\u1ec1 m\u1eb7t x\u00fac t\u00e1c do m\u1ed9t s\u1ef1 th\u1ea5t b\u1ea1i trong li\u1ec1u oxy h\u00f3a. \u0110\u1ed9 pH th\u1ea5p b\u1ea5t th\u01b0\u1eddng, n\u01b0\u1edbc \u0103n m\u00f2n v\u00e0 \u0111\u1ed9 c\u1ee9ng qu\u00e1 m\u1ee9c c\u0169ng s\u1ebd l\u00e0m ph\u1ee9c t\u1ea1p c\u00e1c matrixes n\u01b0\u1edbc, c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn thi\u1ec7t h\u1ea1i ph\u01b0\u01a1ng ti\u1ec7n truy\u1ec1n th\u00f4ng. Vui l\u00f2ng tham kh\u1ea3o \u00fd ki\u1ebfn<\/a> c\u1ee7a nh\u00e2n vi\u00ean DMI-65 \u0111\u1ec3 nh\u1eadn l\u1eddi khuy\u00ean.[\/vc_toggle][vc_toggle title=”Th\u1ee7 t\u1ee5c cho m\u1ed9t b\u1ed9 l\u1ecdc DMI-65 l\u00e0 g\u00ec \u0111\u1ec3 \u0111i offline v\u00e0 \u0111\u01b0\u1ee3c ra d\u1ecbch v\u1ee5 cho m\u1ed9t kho\u1ea3ng th\u1eddi gian?” style=”simple” color=”peacoc”]C\u00e1c th\u1ef1c h\u00e0nh t\u1ed1t nh\u1ea5t trong t\u00ecnh hu\u1ed1ng n\u00e0y l\u00e0 ho\u00e0n to\u00e0n Submerge c\u00e1c ph\u01b0\u01a1ng ti\u1ec7n truy\u1ec1n th\u00f4ng x\u1eed tr\u1ecb n\u01b0\u1edbc gi\u01b0\u1eddng trong m\u1ed9t gi\u1ea3i ph\u00e1p clo m\u1ea1nh m\u1ebd nh\u01b0 \u0111\u01b0\u1ee3c \u0111\u1ec1 ngh\u1ecb trong DMI-65 thi\u1ebft l\u1eadp h\u01b0\u1edbng d\u1eabn<\/a>. C\u00e1c b\u1ed9 l\u1ecdc \u0111\u00e3 \u0111\u01b0\u1ee3c duy tr\u00ec trong t\u1ed1i \u0111a 5 \u2013 10 n\u0103m li\u00ean t\u1ee5c v\u1edbi s\u1ef1 c\u1ed1 gi\u00e1n tuy\u1ebfn theo m\u00f9a trong 6 th\u00e1ng \u0111\u01b0\u1ee3c duy tr\u00ec v\u00e0 s\u1eb5n s\u00e0ng ho\u1ea1t \u0111\u1ed9ng trong nh\u1eefng th\u00e1ng m\u00f9a h\u00e8.[\/vc_toggle][vc_toggle title=”L\u00e0 n\u00f3 c\u1ea7n thi\u1ebft \u0111\u1ec3 li\u1ec1u clo trong n\u01b0\u1edbc ph\u00eda?” style=”simple” color=”peacoc”]Qu\u00e1 tr\u00ecnh oxy h\u00f3a n\u00e2ng cao \u0111\u01b0\u1ee3c duy tr\u00ec t\u1ed1t nh\u1ea5t khi \u0111\u1ed9 pH v\u00e0 ch\u1ea5t oxy ho\u00e1 l\u00e0 \u1ed5n \u0111\u1ecbnh v\u00e0 li\u00ean t\u1ee5c. \u0110i\u1ec1u n\u00e0y l\u1ea7n l\u01b0\u1ee3t th\u00fac \u0111\u1ea9y m\u1ed9t tr\u1ea1ng th\u00e1i li\u00ean t\u1ee5c c\u1ee7a x\u00fac t\u00e1c v\u1edbi s\u1eaft v\u00e0 mangan. C\u00e1c oxy h\u00f3a d\u00f9ng thu\u1ed1c n\u00ean \u0111\u01b0\u1ee3c hi\u1ec7u ch\u1ec9nh \u0111\u1ec3 ph\u00f9 h\u1ee3p v\u1edbi t\u1ed1c \u0111\u1ed9 c\u1ee7a d\u00f2ng ch\u1ea3y d\u1ecbch v\u1ee5, nh\u01b0ng c\u0169ng \u0111\u1ebfn t\u1ed1c \u0111\u1ed9 c\u1ee7a ph\u00eda \u0111\u1ecbnh k\u1ef3 \u0111\u1ec3 d\u01b0 clo c\u00f9ng m\u1ed9t Vi\u1ec7t \u0111\u01b0\u1ee3c duy tr\u00ec t\u1ea1i 0,1 \u2013 0,3 mg\/L trong r\u1eeda m\u1eb7t v\u00e0 n\u01b0\u1edbc s\u1ea3n ph\u1ea9m.[\/vc_toggle][vc_toggle title=”Li\u1ec1u clo l\u1edbn h\u01a1n s\u1ebd lo\u1ea1i b\u1ecf th\u00eam s\u1eaft v\u00e0 mangan?” style=”simple” color=”peacoc”]\u0110\u00e2y l\u00e0 m\u1ed9t quan ni\u1ec7m sai l\u1ea7m ph\u1ed5 bi\u1ebfn, v\u00ec n\u00f3 l\u00e0 c\u00e1c l\u1edbp x\u00fac t\u00e1c DMI-65 t\u0103ng c\u01b0\u1eddng qu\u00e1 tr\u00ecnh oxy h\u00f3a. Trong th\u1ef1c t\u1ebf, li\u1ec1u l\u01b0\u1ee3ng l\u1edbn h\u01a1n c\u1ee7a clo c\u00f3 kh\u1ea3 n\u0103ng s\u1ebd l\u00e0m gi\u1ea3m hi\u1ec7u su\u1ea5t do c\u00e1c sulfua c\u1ea1nh tranh \u0111\u01b0\u1ee3c \u0111\u01b0a v\u00e0o ma tr\u1eadn n\u01b0\u1edbc.[\/vc_toggle][vc_toggle title=”Chi ph\u00ed ho\u1ea1t \u0111\u1ed9ng c\u1ee7a vi\u1ec7c s\u1eed d\u1ee5ng DMI-65 \u0111\u1ec3 lo\u1ea1i b\u1ecf s\u1eaft v\u00e0 mangan l\u00e0 g\u00ec?” style=”simple” color=”peacoc”]T\u00ednh to\u00e1n c\u01a1 b\u1ea3n c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh bao nhi\u00eau clo l\u00e0 c\u1ea7n thi\u1ebft cho vi\u1ec7c s\u1eed d\u1ee5ng ho\u1ea1t \u0111\u1ed9ng v\u1edbi DMI-65 clo Injection Calculator. Tuy nhi\u00ean, nh\u01b0 m\u1ed9t v\u00ed d\u1ee5, \u0111i\u1ec3n h\u00ecnh s\u1eaft v\u00e0 mangan n\u01b0\u1edbc t\u1eadp trung c\u00f3 th\u1ec3 c\u00f3 chi ph\u00ed kho\u1ea3ng $0,01 cho m\u1ed7i m\u00e9t kh\u1ed1i n\u01b0\u1edbc x\u1eed l\u00fd.[\/vc_toggle][vc_toggle title=”DMI-65 c\u00f3 y\u00eau c\u1ea7u t\u00e1i t\u1ea1o h\u00f3a h\u1ecdc kh\u00f4ng?” style=”simple” color=”peacoc”]DMI-65 kh\u00f4ng y\u00eau c\u1ea7u t\u00e1i t\u1ea1o h\u00f3a ch\u1ea5t v\u00e0 kh\u00f4ng c\u00f3 nhu c\u1ea7u h\u00f3a h\u1ecdc cao. DMI-65 l\u00e0 chi ph\u00ed th\u1ea5p nh\u1ea5t, gi\u1ea3i ph\u00e1p tr\u1ecdn \u0111\u1eddi cho s\u1eaft, mangan v\u00e0 lo\u1ea1i b\u1ecf asen t\u1eeb ngu\u1ed3n n\u01b0\u1edbc ng\u1ea7m.[\/vc_toggle][vc_toggle title=”T\u1ea1i sao DMI-65 c\u00f4ng ngh\u1ec7 truy\u1ec1n kh\u00e1c nhau t\u1eeb Medias tr\u00e1ng kh\u00e1c?” style=”simple” color=”peacoc”]C\u00f4ng ngh\u1ec7 truy\u1ec1n DMI-65 th\u00e2m nh\u1eadp v\u00e0o c\u1ea5u tr\u00fac ph\u1ee5 vi x\u1ed1p c\u1ee7a v\u1eadt li\u1ec7u ma tr\u1eadn \u0111\u1ec3 t\u1ea1o th\u00e0nh c\u00e1c li\u00ean k\u1ebft h\u00f3a h\u1ecdc m\u1ea1nh m\u1ebd. S\u1ea3n ph\u1ea9m ho\u00e0n ch\u1ec9nh l\u00e0 k\u1ebft qu\u1ea3 c\u1ee7a c\u00f4ng ngh\u1ec7 ti\u00ean ti\u1ebfn \u0111\u01b0\u1ee3c ph\u00e1t tri\u1ec3n v\u1edbi m\u1ee5c ti\u00eau l\u00e0 c\u00f3 hi\u1ec7u qu\u1ea3 cao, b\u1ec1n v\u1eefng v\u00e0 chi ph\u00ed ho\u1ea1t \u0111\u1ed9ng th\u1ea5p nh\u1ea5t.[\/vc_toggle][vc_toggle title=”DMI-65 c\u00f3 c\u00f4ng su\u1ea5t t\u1ea3i cao h\u01a1n so v\u1edbi c\u00e1c ph\u01b0\u01a1ng ti\u1ec7n x\u00fac t\u00e1c kh\u00e1c kh\u00f4ng?” style=”simple” color=”peacoc”]B\u1edfi v\u00ec c\u00e1c c\u00f4ng ngh\u1ec7 truy\u1ec1n v\u00e0 c\u1ea5u tr\u00fac vi x\u1ed1p c\u1ee7a v\u1eadt li\u1ec7u ma tr\u1eadn DMI-65 c\u00f3 di\u1ec7n t\u00edch b\u1ec1 m\u1eb7t t\u0103ng l\u00ean v\u00e0 kh\u1ea3 n\u0103ng ch\u1ecbu t\u1ea3i cao h\u01a1n cho s\u1eaft v\u00e0 mangan m\u1ee5c ti\u00eau.[\/vc_toggle][vc_toggle title=”DMI-65 ho\u1ea1t \u0111\u1ed9ng \u1edf m\u1ee9c l\u01b0u l\u01b0\u1ee3ng cao h\u01a1n so v\u1edbi c\u00e1c ph\u01b0\u01a1ng ti\u1ec7n x\u00fac t\u00e1c kh\u00e1c?” style=”simple” color=”peacoc”]C\u00f4ng ngh\u1ec7 truy\u1ec1n th\u00fac \u0111\u1ea9y t\u1ef7 l\u1ec7 \u00f4xi h\u00f3a cao nh\u1ea5t c\u1ee7a b\u1ea5t k\u1ef3 ph\u01b0\u01a1ng ti\u1ec7n x\u00fac t\u00e1c n\u00e0o. Cho ph\u00e9p v\u1eadn t\u1ed1c l\u1ecdc cao h\u01a1n nhi\u1ec1u, \u0111\u1ea1t \u0111\u01b0\u1ee3c k\u1ebft qu\u1ea3 mong mu\u1ed1n t\u01b0\u01a1ng t\u1ef1 ho\u1eb7c t\u1ed1t h\u01a1n.[\/vc_toggle][vc_toggle title=”L\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 DMI-65 lo\u1ea1i b\u1ecf s\u1eaft k\u1ebft t\u1ee7a v\u00e0 mangan trong backwash?” style=”simple” color=”peacoc”]Vi\u1ec7c fluidisation c\u1ee7a gi\u01b0\u1eddng ph\u01b0\u01a1ng ti\u1ec7n truy\u1ec1n th\u00f4ng cho ph\u00e9p k\u1ebft t\u1ee7a s\u1eaft v\u00e0 mangan \u0111\u1ec3 tho\u00e1t kh\u1ecfi trong r\u1eeda ng\u01b0\u1ee3c. N\u0103ng l\u01b0\u1ee3ng \u0111\u1ed9ng h\u1ecdc c\u1ee7a ph\u00eda l\u00e0 \u0111\u1ee7 m\u1ea1nh \u0111\u1ec3 ph\u00e1t h\u00e0nh m\u1ed9t ph\u1ea7n s\u1eaft oxy h\u00f3a v\u00e0 mangan l\u00e0 h\u00f3a h\u1ecdc thu h\u00fat b\u1edfi h\u1ea5p ph\u1ee5 \u1edf b\u1ec1 m\u1eb7t x\u00fac t\u00e1c c\u1ee7a c\u00e1c ph\u01b0\u01a1ng ti\u1ec7n truy\u1ec1n th\u00f4ng.[\/vc_toggle][vc_toggle title=”DMI-65 gi\u1eef l\u1ea1i k\u1ebft t\u1ee7a s\u1eaft v\u00e0 mangan nh\u01b0 th\u1ebf n\u00e0o?” style=”simple” color=”peacoc”]S\u1eaft h\u00f2a tan v\u00e0 mangan l\u00e0 thu h\u00fat h\u00f3a h\u1ecdc b\u1eb1ng c\u00e1ch h\u1ea5p ph\u1ee5 v\u00e0o b\u1ec1 m\u1eb7t c\u1ee7a c\u00e1c ph\u01b0\u01a1ng ti\u1ec7n truy\u1ec1n th\u00f4ng. Khi h\u1ecd \u00f4xi h\u00f3a v\u00e0 l\u1ea5y m\u1ed9t h\u00ecnh th\u1ee9c v\u1eadt l\u00fd c\u00f3 k\u00edch th\u01b0\u1edbc h\u1ea1t l\u1edbn h\u01a1n so v\u1edbi nh\u1eefng kho\u1ea3ng tr\u1ed1ng trong c\u00e1c h\u1ea1t DMI-65.[\/vc_toggle][vc_toggle title=”L\u00e0 DMI-65 an to\u00e0n \u0111\u1ec3 s\u1eed d\u1ee5ng cho c\u00e1c \u1ee9ng d\u1ee5ng n\u01b0\u1edbc u\u1ed1ng?” style=”simple” color=”peacoc”]DMI-65 \u0111\u00e3 \u0111\u01b0\u1ee3c ch\u1ee9ng nh\u1eadn \u0111\u1ec3 s\u1eed d\u1ee5ng an to\u00e0n trong c\u00e1c \u1ee9ng d\u1ee5ng n\u01b0\u1edbc u\u1ed1ng<\/a> theo c\u00e1c Hi\u1ec7p h\u1ed9i ch\u1ea5t l\u01b0\u1ee3ng n\u01b0\u1edbc ‘ nsf ANSI 61 ti\u00eau chu\u1ea9n v\u00e0ng Seal ch\u01b0\u01a1ng tr\u00ecnh<\/a>. Ngo\u00e0i ra DMI-65 ph\u01b0\u01a1ng ti\u1ec7n truy\u1ec1n th\u00f4ng l\u1ecdc n\u01b0\u1edbc \u0111\u01b0\u1ee3c ch\u1ea5p thu\u1eadn an to\u00e0n \u0111\u1ec3 s\u1eed d\u1ee5ng b\u1edfi thanh tra n\u01b0\u1edbc u\u1ed1ng c\u1ee7a V\u01b0\u01a1ng Qu\u1ed1c Anh.[\/vc_toggle][\/vc_column][\/vc_row][vc_row content_placement=”middle” css=”.vc_custom_1592794121420{padding-top: 20px !important;padding-right: 20px !important;padding-bottom: 5px !important;padding-left: 20px !important;}” el_class=”cta”][vc_column]

<\/span>\u0110\u1ec3 bi\u1ebft th\u00eam c\u00e1c c\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p s\u1eed d\u1ee5ng DMI-65\u00ae ph\u01b0\u01a1ng ti\u1ec7n x\u1eed tr\u1ecb n\u01b0\u1edbc vui l\u00f2ng h\u1ecfi <\/span><\/div><\/div>[vc_btn title=”C\u00c2U H\u1eceI K\u1ef8 THU\u1eacT” style=”custom” custom_background=”#162441″ custom_text=”#ffffff” shape=”square” size=”lg” align=”center” i_align=”right” i_icon_fontawesome=”fas fa-chevron-right” add_icon=”true” css=”.vc_custom_1593050402705{margin-top: 20px !important;}” el_class=”ctaButton sg-popup-id-8549″][\/vc_column][\/vc_row]<\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"

[vc_row][vc_column][vc_column_text]C\u00e1c c\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p s\u1eed d\u1ee5ng DMI-65\u00ae ph\u01b0\u01a1ng ti\u1ec7n x\u1eed tr\u1ecb n\u01b0\u1edbc, \u0111\u1ec3 bi\u1ebft th\u00eam th\u00f4ng tin c\u1ee5 th\u1ec3 xin vui l\u00f2ng li\u00ean h\u1ec7[\/vc_column_text][vc_toggle title=”Bao l\u00e2u s\u1ebd DMI-65 cu\u1ed1i c\u00f9ng trong m\u1ed9t h\u1ec7 th\u1ed1ng l\u1ecdc?” style=”simple” color=”peacoc”]N\u1ebfu DMI-65 \u0111\u01b0\u1ee3c duy tr\u00ec v\u00e0 ho\u1ea1t \u0111\u1ed9ng theo c\u00e1c th\u00f4ng s\u1ed1 thi\u1ebft k\u1ebf c\u1ee7a n\u00f3, n\u00f3 s\u1ebd…<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":7172,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"content-type":"","footnotes":""},"class_list":["post-8689","page","type-page","status-publish","hentry","description-off"],"yoast_head":"\nPh\u01b0\u01a1ng ti\u1ec7n x\u1eed tr\u1ecb n\u01b0\u1edbc th\u01b0\u1eddng g\u1eb7p c\u00e2u h\u1ecfi - DMI-65\u00ae<\/title>\n<meta name=\"description\" content=\"C\u00e1c c\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p s\u1eed d\u1ee5ng DMI-65\u00ae ph\u01b0\u01a1ng ti\u1ec7n x\u1eed tr\u1ecb n\u01b0\u1edbc, \u0111\u1ec3 bi\u1ebft th\u00eam th\u00f4ng tin ho\u1eb7c c\u00e1c c\u00e2u h\u1ecfi k\u1ef9 thu\u1eadt xin vui l\u00f2ng li\u00ean h\u1ec7.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/dmi65.com\/vi\/ky-thuat\/nhung-cau-hoi-thuong-gap\/\" \/>\n<meta property=\"og:locale\" content=\"vi_VN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Ph\u01b0\u01a1ng ti\u1ec7n x\u1eed tr\u1ecb n\u01b0\u1edbc th\u01b0\u1eddng g\u1eb7p c\u00e2u h\u1ecfi - DMI-65\u00ae\" \/>\n<meta property=\"og:description\" content=\"C\u00e1c c\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p s\u1eed d\u1ee5ng DMI-65\u00ae ph\u01b0\u01a1ng ti\u1ec7n x\u1eed tr\u1ecb n\u01b0\u1edbc, \u0111\u1ec3 bi\u1ebft th\u00eam th\u00f4ng tin ho\u1eb7c c\u00e1c c\u00e2u h\u1ecfi k\u1ef9 thu\u1eadt xin vui l\u00f2ng li\u00ean h\u1ec7.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/dmi65.com\/vi\/ky-thuat\/nhung-cau-hoi-thuong-gap\/\" \/>\n<meta property=\"og:site_name\" content=\"DMI-65\u00ae\" \/>\n<meta property=\"article:modified_time\" content=\"2020-06-26T03:12:42+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/dmi65.com\/wp-content\/uploads\/2020\/06\/dmi65_Logo_Blk.png\" \/>\n\t<meta property=\"og:image:width\" content=\"466\" \/>\n\t<meta property=\"og:image:height\" content=\"200\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"29 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/dmi65.com\/vi\/ky-thuat\/nhung-cau-hoi-thuong-gap\/\",\"url\":\"https:\/\/dmi65.com\/vi\/ky-thuat\/nhung-cau-hoi-thuong-gap\/\",\"name\":\"Ph\u01b0\u01a1ng ti\u1ec7n x\u1eed tr\u1ecb n\u01b0\u1edbc th\u01b0\u1eddng g\u1eb7p c\u00e2u h\u1ecfi - 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