Hauv MBR biochemical kev ua haujlwm thiab kev saib xyuas, lub ntsiab lus tseem ceeb tshaj plaws ntawm kev tswj hwm -thiab qhov feem ntau tsis pom zoo los ntawm cov novices- yog MLSS (Mixed Liquor Suspended Solids) concentration.
Kev paub dhau los nthuav tawm tias feem ntau cov teeb meem- xws li cov sludge sludge nyob rau hauv daim nyias nyias, explosive biofilm loj hlob, nquag fiber ntau breakage, thiab instability nyob rau hauv lub biochemical system- thaum kawg stems los ntawm uncontrolled sludge concentrations.
Kos rau ntau xyoo ntawm tes- ntawm kev paub dhau los, kev lag luam tau txheeb xyuas qhov kev ua haujlwm zoo tshaj plaws uas tsis txhob muaj kev cuam tshuam ntau: tswj MBR system's MLSS tsis tu ncua ntawm 6,000 thiab 10,000 mg / L kom ruaj khov thiab teeb meem ntau tshaj - ua haujlwm dawb. Deviating siab dhau lossis qis dhau ua rau muaj kev cuam tshuam ntawm kev ua tsis tiav.
Cov neeg ua haujlwm tshiab feem ntau poob rau hauv ib qho ntawm ob qhov kev kub ntxhov: lawv tsis kam tso cov sludge, ua rau muaj kev sib txuam ntau dhau, lossis lawv tso tawm ntau dhau, ua rau cov concentration qis. Ob qho kev coj ua tuaj yeem ua rau tag nrho cov txheej txheem membrane.
Xav txog cov kev pheej hmoo ntawm qhov tsis tshua muaj siab: ib zaug MLSS poob qis dua 5,000 mg / L, biofilm proliferates wildly, ua rau pom thiab tsis tuaj yeem thaiv cov membrane txhaws.
Thaum cov sludge concentration tsawg dhau lawm, cov txheej txheem biochemical cov khoom thauj tau zoo nce, thiab cov zej zog microbial ua tsis zoo. Cov kab mob oligotrophic thiab cov kab mob nplaum nplaum ua kom sib npaug sai; sludge flocs dhau los ua xoob thiab tawg, cov ntsiab lus colloidal nyob rau hauv cov dej surges, thiab tag nrho cov dej zoo stability poob tag nrho.
Cov nplua, nplaum impurities sai sai ua rau cov membrane fibers, tsim ib txheej ntom ntom ntawm cov roj ntsha slime. Tsis zoo li tus qauv sludge ncuav mog qab zib, slime no tsis tshua muaj nplaum thiab khov; cov pa aeration scouring thiab online huv si - dej rov qab yog qhov tsis muaj txiaj ntsig ntawm kev tshem tawm.
Tsis pub dhau kaum mus rau nees nkaum hnub, cov membrane pore clogging hnyav tshwm sim, ua rau TMP (Trans-Membrane Pressure) rau skyrocket thiab permeate ntau lawm rau plummet. Txoj kev kho tsuas yog siv tshuaj tua kab mob hnyav, tab sis rov ua dua tshiab degrades fiber ntau toughness, ua rau cov khoom siv membrane nce nkig dhau sijhawm. Xav txog cov teeb meem tseem ceeb uas cuam tshuam nrog cov concentrations siab: thaum MLSS tsis tu ncua ntau dua 12,000 mg / L, tus nqi ntawm cov membrane filament breakage skyrockets.
Cov sludge ntau dhau ua rau cov viscosity ntawm cov cawv sib xyaw hauv lub tank membrane, impairs flowability, thiab drastic nce tsis kam mus rau aeration - induced turbulence. High -viscosity sludge subjects membrane filaments to nruam kev sib txhuam thiab nro, ua kom lawv nyob rau hauv lub xeev siab ntawm -load nkees.
Nyob rau tib lub sijhawm, siab -sludge concentration yog nquag mus rau hauv cheeb tsam sib sau ua ke thiab tsis sib xws, ua rau muaj kev ntxhov siab tsis sib haum ntawm cov filaments, uas ua rau muaj kev sib tsoo ntau dhau, hnav hnav, thiab qaug zog- ua rau tawg. Cov ntaub ntawv qhia meej qhia tau hais tias nyob rau hauv tej yaam num uas MLSS tshaj qhov txwv, txhua xyoo filament breakage tus nqi yog peb mus rau plaub zaug siab tshaj nyob rau hauv tus txheej txheem ntau yam, ua rau tsis tu ncua nqi siab rau kho thiab hloov daim nyias nyias.
Qhov "golden range" ntawm 6,000-10,000 mg / L ua rau qhov sib npaug zoo.
Qhov no zoo kawg nkaus sib npaug ntawm kev ua haujlwm biochemical nrog kev xav tau los tiv thaiv daim nyias nyias. Nyob rau hauv no ntau yam, cov qauv microbial hauv zej zog tseem ruaj khov, thiab flocs yog ntom; Cov pa phem degradation efficiency yog siab, thiab kev loj hlob ntawm cov nplaum biofilms yog tsawg. Tsis tas li ntawd, cov kua viscosity yog nruab nrab, kom ntseeg tau tias qhov zoo tshaj plaws aeration scouring cuam tshuam thiab ua kom txhua yam hnav ntawm cov filaments tswj.
Nov yog cov lus pom zoo ua haujlwm uas koj tuaj yeem siv ncaj qha:
Rau qhov qis -load influent tej yam kev mob, tswj MLSS ntawm 6,000–7,000 mg/L kom tsis txhob muaj microbial imbalance thiab biofilm proliferation. Rau siab -load, siab- cov dej khib nyiab hauv kev lag luam, tswj qib ntawm 8,000–10,000 mg / L los txhim kho biochemical degradation peev xwm; nruj me ntsis tswj cov hnub nyoog sludge thiab tso tawm sludge raws li xav tau los tiv thaiv ntau dhau.
Tus yuam sij rau lub sijhawm ntev - kev ruaj ntseg ntawm MBR system tsis yog nyob rau hauv kev tu cov ntaub so ntswg ntau zaus lossis yuam cov cuab yeej los tiv thaiv cov xwm txheej hnyav, tab sis hauv kev tswj hwm biochemical. Kev ua raws li MLSS concentration txwv tiv thaiv kev ruaj ntseg ntawm cov txheej txheem membrane.
