Flocculation - Aluminium sulphate vs Poly aluminium chloride

Flocculation yog cov txheej txheem los ntawm qhov tsis zoo them nyiaj tshem tawm cov khoom uas muaj nyob rau hauv qhov kev ncua ruaj khov hauv dej yog destabilized. Qhov no yog ua tiav los ntawm kev ntxiv cov coagulant zoo. Tus nqi zoo hauv coagulant neutralizes cov nqi tsis zoo tam sim no hauv dej (piv txwv li destabilizes nws). Thaum cov khoom tsis ruaj khov lossis nruab nrab, cov txheej txheem flocculation tshwm sim. Cov destabilized hais ua ke rau hauv cov khoom loj thiab loj dua kom txog rau thaum lawv hnyav txaus los khom tawm los ntawm sedimentation los yog loj txaus los cuab cua npuas thiab ntab.

Niaj hnub no peb yuav saib ze dua ntawm cov khoom flocculation ntawm ob hom flocculants: poly aluminium chloride thiab aluminium sulfate.

Aluminium Sulfate: Aluminium Sulfate yog acidic hauv xwm. Lub hauv paus ntsiab lus ntawm kev ua haujlwm ntawm aluminium sulfate yog raws li hauv qab no: aluminium sulfate tsim aluminium hydroxide, Al (0H) 3. Aluminium hydroxides muaj ib tug txwv pH ntau yam, saum toj no uas lawv yuav tsis zoo hydrolysis los yog , hydrolyzated aluminium hydroxides nyob sai sai ntawm pH siab (pH pH saum toj no 8.5), yog li cov kev khiav hauj lwm pH yuav tsum tau ua tib zoo tswj kom nws nyob rau hauv qhov ntau ntawm 5.8-8.5. . alkalinity nyob rau hauv dej yuav tsum txaus thaum lub sij hawm flocculation txheej txheem los xyuas kom meej tias insoluble hydroxide yog tag nrho tsim thiab precipitated. Tshem tawm cov xim thiab cov khoom siv colloidal los ntawm kev sib xyaw ntawm adsorption thiab hydrolysis ntawm / rau hauv cov hlau hydroxides. Yog li ntawd, kev khiav hauj lwm pH qhov rais ntawm txhuas sulfate yog nruj me ntsis 5.8-8.5, yog li nws yog ib qho tseem ceeb heev los xyuas kom meej pH zoo nyob rau hauv cov txheej txheem thaum siv txhuas sulfate.

Polyaluminium chloride(PAC) yog ib qho tshuaj kho dej zoo tshaj plaws hauv kev siv niaj hnub no. Nws yog dav siv hauv dej haus thiab kev kho dej khib nyiab vim tias nws cov coagulation siab ua haujlwm thiab qhov dav tshaj pH thiab kub daim ntawv thov piv rau lwm cov tshuaj kho dej. PAC muaj nyob rau hauv ntau qib sib txawv nrog alumina concentrations xws li 28% mus rau 30%. Alumina concentration tsis yog tib qho kev txiav txim siab thaum xaiv qib twg ntawm PAC siv.

PAC tuaj yeem suav tias yog pre-hydrolysis coagulant. Lub pre-hydrolysis aluminium pawg muaj cov nqi zoo heev, uas ua rau PAC ntau cationic dua alum.ua rau nws muaj zog destabilizer rau qhov tsis zoo them cov impurities hauv dej.

PAC muaj cov nram qab no zoo dua aluminium sulfate

1. Nws ua haujlwm ntawm qhov qis qis dua. Raws li txoj cai ntawm tus ntiv tes xoo, koob tshuaj PAC yog kwv yees li ib feem peb ntawm cov koob tshuaj uas xav tau rau alum.

2. Nws tawm tsawg dua aluminium residual nyob rau hauv cov dej kho

3. Nws tsim cov sludge tsawg

4. Nws ua haujlwm tshaj pH dav

Muaj ntau ntau hom flocculants, thiab tsab xov xwm no tsuas yog qhia ob ntawm lawv. Thaum xaiv cov coagulant, koj yuav tsum xav txog cov dej zoo uas koj kho thiab koj tus kheej cov peev nyiaj. Kuv vam tias koj yuav muaj kev kho dej zoo. Raws li cov khoom siv tshuaj kho dej nrog 28 xyoo ntawm kev paub. Kuv zoo siab los daws koj cov teeb meem (txog cov tshuaj kho dej).