Qhov kev lees paub dav dav tshaj plaws hais txog cov txheej txheem ntawm kev tsim cov sludge floc yog qhov cuam tshuam ntawm cov kab mob extracellular polymers thiab cov kab mob filamentous. Yog li ntawd, cov sludge-dej sib cais teeb meem nyob rau hauv activated sludge systems kuj tau piav qhia los ntawm cov nram qab no yam:
1. Kev loj hlob tawg
Dispersed kev loj hlob, tseem hu ua anti-flocculation los yog sludge disintegration, feem ntau ntseeg tau tias yog vim tsis muaj extracellular polymers los yog cuam tshuam nrog bridging nyhuv ntawm cov polymers, tiv thaiv activated sludge microorganisms los ntawm adhering ua ke. Cov yam tseem ceeb uas tuaj yeem ua rau kev loj hlob tawg mus xws li: kev loj hlob ntau dhau ntawm cov kab mob uas tsis yog -flocculating; tsawg piv ntawm divalent cations (piv txwv li, calcium thiab magnesium ions) rau monovalent cations (potassium thiab sodium ions); cov tshuaj tiv thaiv -flocculation nyhuv ntawm biosurfactants; sludge lom vim kev taw qhia ntawm co toxins; ib tug ntse nce nyob rau hauv tus F / M piv los ntawm shock loads los yog sludge poob; thiab loj - cheeb tsam acidification thiab disintegration ntawm anaerobic sludge nyob rau hauv lub aeration tank.
Xws li flocs sib txawv loj heev; flocs loj dua dab dej sai sai, thaum cov flocs me me ua rau qeeb qeeb, tsim ib txheej tsis tu ncua nrog cov turbid supernatant.
2. Koob -zoo li tus sludge flocs
Thaum qhib cov sludge flocs tsuas muaj floc-zoo li cov kab mob thiab tsis muaj cov kab mob filamentous, lawv feem ntau me me (li 75µm), xoob, thiab nkig. Cov flocs no hu ua koob - zoo li cov sludge flocs.
Thaum bioflocculation tsis muaj txiaj ntsig, cov flocs tau yooj yim sheared rau hauv cov khoom tawg yooj yim los ntawm cov turbulent ntws hauv lub tank aeration, tshwj xeeb tshaj yog thaum siv cov tshuab aeration lossis cov npuas loj. Tsis tas li ntawd, ntau lub twj tso kua mis, lub ntiajteb txawj nqus weirs, thiab tortuous kav yuav tsim turbulence, ntxiv shearing cov flocs rau hauv me me pieces. Thaum cov sludge loading (F/M) tsawg dhau lawm, sludge aging kuj tuaj yeem ua rau rab koob - zoo li cov sludge flocs.
Cov flocs sib txawv loj heev; loj flocs nyob sai sai, thaum me me flocs nyob maj mam, tsim ib tug discontinuous txheej nrog ib tug turbid supernatant.
3. Tshem tawm flocs tawg
Loose flocs tuaj yeem pom tau raug tshem tawm ntawm qhov chaw ntawm lub tank thib ob, tab sis cov dej ntws tawm tseem pom tseeb. Kev ntsuas ntsuas tau pom tias cov sludge daws qhov nrawm nrawm. Qhov tshwm sim no hu ua xoob floc suspension. Qhov laj thawj tseem ceeb yog vim li cas cov sludge loading (F / M) siab dhau lawm, cov kab mob activated sludge yog nyob rau theem kev loj hlob ntawm logarithmic, ua rau lub zog siab hauv cov activated sludge, muaj zog microbial kev ua, xoob sludge floc kev ntxhib los mos, tsis zoo floc tsim, thiab teeb meem. Thaum cov sludge loading raug txo kom tsim nyog, cov xoob flocs tuaj yeem ploj mus.