High MLSS (Mixed Liquor Suspended Solids) tuaj yeem ua rau kev puas tsuaj rau cov dej khib nyiab hauv ntau txoj hauv kev, suav nrog kev hloov pauv loj, sedimentation, kev siv hluav taws xob, thiab cov txheej txheem ruaj khov. Qhov teeb meem tseem ceeb yog tias nws tshaj qhov tsim nyog nqa peev xwm rau microbial ciaj sia taus thiab cov txheej txheem ua haujlwm. Cov kev cuam tshuam tshwj xeeb thiab cov ntsiab lus tseem ceeb yog raws li hauv qab no:
1. Tsis txaus Dissolved Oxygen, Ua rau Sludge Hypoxia/Anaerobic Ib puag ncig
High MLSS ua rau kom cov pa oxygen xav tau ntawm cov kab mob, txo cov pa oxygen hloov mus rau hauv lub tank aeration thiab yooj yim ua rau thaj chaw hauv cheeb tsam hypoxic / anaerobic. Cov kab mob aerobic yog inhibited, txo cov organic teeb meem degradation efficiency; denitrification tshwm sim ntxov ntxov nyob rau hauv lub aeration tank, tsim ib tug loj tus naj npawb ntawm npuas, ua rau sludge bulking, sludge floating, thiab ntau tshaj COD thiab ammonia nitrogen nyob rau hauv lub effluent.
2. Deterioration ntawm theem nrab nyob rau hauv lub tank sedimentation kev ua tau zoo, ua rau ib tug surge nyob rau hauv effluent suspended solids (SS).
High MLSS nce viscosity ntawm cov cawv sib xyaw, ua rau cov sludge flocs sib zog. Qhov no yooj yim ua rau stratified sedimentation nyob rau hauv lub thib ob settling tank, txo sludge compressibility thiab txo qis tshaj tawm. Ib txhij, siab -concentration sludge yog nquag denitrification (lub anoxic decomposition ntawm nitrates ua N₂ npuas uas nqa sludge mus rau saum npoo), ua rau sludge poob thiab SS effluent ntau dhau. Qhov no tseem ua rau ntxiv sludge poob los ntawm qhov system, tsim kom muaj lub voj voog tsis zoo.
3. Ua kom aeration zog noj thiab nce nqi khiav hauj lwm.
Txhawm rau ua kom tau raws li qhov xav tau ntawm cov pa oxygen siab ntawm MLSS, kev siv aeration yuav tsum tau nce ntxiv, ua rau kom muaj kev sib npaug ntawm kev siv lub tshuab hluav taws xob. Nyob rau tib lub sijhawm, lub siab viscosity ntawm cov cawv sib xyaw ua rau muaj kev thauj mus los thiab kev sib xyaw ua haujlwm ntawm cov twj thiab cov khoom sib xyaw, ntxiv rau kev siv zog ntxiv. Qhov no ua rau cov nqi khiav lag luam nce ntau yam tsis muaj cov txiaj ntsig txheej txheem.
4. Shortened sludge hnub nyoog thiab microbial imbalance
High MLSS, ua ke nrog kev tshem tawm cov sludge tsis tu ncua, ua rau lub sijhawm luv dua sludge (SRT) hauv qhov system. Qhov no ua rau nws nyuaj rau ntev - tiam - lub voj voog nitrifying kab mob thiab lwm cov kab mob ua haujlwm kom muaj sia nyob, txo qis nitrification efficiency thiab ua kom cov dej ammonia nitrogen ntau dhau cov qauv. Tib lub sijhawm, cov kab mob tseem ceeb hloov mus rau qhov fouling ntau dua - cov genera resistant, ua rau kom lub cev tsis kam mus rau qhov hloov pauv ntawm cov dej zoo thiab kom muaj nuj nqis.
5. Membrane txheej txheem- cov teeb meem tshwj xeeb (piv txwv li, MBR): Accelerated membrane fouling
Nyob rau hauv daim nyias nyias bioreactors, siab MLSS ho nce qhov tshwm sim ntawm kev sib cuag ntawm colloids thiab flocs nyob rau hauv lub mix cawv thiab daim nyias nyias. Qhov no ua kom cov membrane pore blockage, lim ncuav mog qab zib thickening, thiab nce ceev hauv transmembrane siab (TMP). Qhov no ua rau kom muaj qhov ua kom huv ntawm daim nyias nyias, ua kom lub neej luv luv, thiab ua kom cov nqi tu ntau.
6. Kev poob siab ntawm kev poob siab, ua kom tiav kev sib tsoo
Nyob rau hauv siab MLSS tej yam kev mob, qhov system qhov chaw tsis yog heev me me. Thaum nws ntsib kev hloov pauv hauv cov dej muaj txiaj ntsig zoo (xws li COD, tshuaj lom neeg) lossis tus nqi ntws, cov kab mob ua rau tuag taus vim kev hloov pauv ib puag ncig, ua rau sludge disintegration. Kev rov qab los tom ntej yog qhov nyuaj thiab siv sijhawm - siv.
Cov ntsiab lus tseem ceeb (Mnemonic):
High sludge ntim=oxygen tsis txaus, tsis muaj kev daws teeb meem, kev siv hluav taws xob siab, microbial tsis txaus, nws yuav tawg; cov txheej txheem membrane tseem yuav ua kom nrawm nrawm.
Tswv yim teb tswv yim:
1. Tam sim ntawd nce sludge tawm kom sai txo MLSS rau cov txheej txheem tsim ntau yam (2000-4000 mg / L rau cov pa aerobic tso tsheb hlau luam, kho raws li cov txheej txheem yuav tsum);
2. Ua kom muaj zog aeration ib ntus kom tsis txhob muaj cov hypoxia hauv zos, thaum saib xyuas DO (tswj ntawm 2-3 mg / L);
3. Txheeb xyuas cov hydraulic load ntawm lub tank thib ob sedimentation, thiab txo tus nqi ntws tawm yog tias tsim nyog los txo cov sludge daws siab;
4. Saib xyuas sludge settling ratio (SV30) thiab sludge volume index (SVI) los txiav txim seb puas muaj cov sludge bulking, thiab ntxiv flocculants (xws li PAC) los txhim kho kev daws teeb meem.