Lub Ntiaj Teb Loj Tshaj Plaws MABR System yuav hloov koj txoj kev nkag siab ntawm Aeration txheej txheem!
Tam sim no, nyob rau hauv feem ntau cov nroj tsuag kev kho dej khib nyiab, kev siv lub zog ntawm cov txheej txheem aeration tso nyiaj ntau dua 50% ntawm tag nrho cov kev siv hluav taws xob ntawm cov nroj tsuag, tawm hauv lub peev xwm loj rau kev txuag hluav taws xob. Raws li cov khoom siv hluav taws xob siv hluav taws xob siv hluav taws xob siv hluav taws xob uas siv cov pa oxygen xa mus los ntawm daim nyias nyias los muab cov pa oxygen thiab ua cov khoom siv biofilm, MABR thev naus laus zis tuaj yeem txo cov dej khib nyiab siv hluav taws xob zoo, ua kom cov khoom siv thauj khoom, thiab txhim kho kev tshem tawm cov nitrogen thiab phosphorus as-ham. Nws muaj cov txiaj ntsig tseem ceeb hauv kev kho cov dej khib nyiab uas xav tau oxygen siab, cov dej tsis zoo ntawm cov organic sib txuas, thiab cov dej ammonia-nitrogen siab.
Hespeler Wastewater Plant: Lub Ntiaj Teb Loj Tshaj Membrane Surface Area MABR System
Nyob hauv Cambridge, Ontario, Canada, Hespeler Wastewater Treatment Plant yog ib qho ntawm kaum peb cov nroj tsuag ua haujlwm rau thaj av Waterloo cov pej xeem ntau dua 600,000 cov neeg.
Keeb kwm tsim nyob rau hauv 1973, cov nroj tsuag tau hloov kho nyob rau hauv 1988 thiab 1992, tab sis cov kev hloov kho tshiab no tsis txaus los ua kom tau raws li cov pej xeem xav tau thiab nce kev kho dej khib nyiab. Yog li ntawd, Waterloo Regional Government txiav txim siab los kho dua txheej txheem kev kho mob thib ob ntawm Hespeler cog.
Hespeler Wastewater Treatment Plant
Hauv 2017 thiab 2018, tsoomfwv hauv cheeb tsam tau tshawb xyuas cov qauv tsim, kev ua haujlwm ntev, thiab kev lag luam muaj peev xwm ntawm kev txhim kho MABR thev naus laus zis, thaum kawg txiav txim siab los txhim kho nws cov aerobic activated sludge system rau MABR / AO (anoxic-oxic) ua ke txheej txheem. Thaum lub phiaj xwm mus nyob hauv 2021, nws tau dhau los ua lub ntiaj teb loj tshaj plaws MABR system nyob rau hauv cov nqe lus ntawm daim nyias nyias.
Qhov kev txiav txim siab xaiv MABR thev naus laus zis rau Hespeler cog tau ua pov thawj tias muaj txiaj ntsig zoo.
1. Los ntawm kev pom kev txuag hluav taws xob:
Hais txog tus thawj aerobic activated sludge txoj kev ntawm Hespeler, seem no tau siv 60% ntawm tag nrho cov zog raws li oxygen xav tau los ntawm micro npuas aeration. Thaum lub sijhawm hloov kho, 40% txo qis hauv biochemical zog noj ntawm cov nroj tsuag tau tshwm sim.
Nyob rau hauv ib qho chaw kho dej khib nyiab, txoj kev siv aeration ib txwm siv tshuab tshuab lossis tshuab aeration uas cov pa los yog cov pa ntshiab yog mechanically yuam rau hauv cov dej khib nyiab. Txawm hais tias cov txheej txheem no ua tau zoo thiab yooj yim los tswj, lawv muaj ntau qhov tsis zoo: Cov npuas aeration ntau ua rau muaj zog siv zog, ua haujlwm tau zoo thiab tsis tshua muaj pa oxygen hloov pauv.
Hauv kev sib piv rau MABR thev naus laus zis, cov ntsiab lus oxygen hauv fiber ntau yog tsav los ntawm qhov sib txawv ntawm sab hauv thiab sab nraud cov ntsiab lus oxygen tom qab pib aeration. Cov ntaub ntawv membrane dissolves thiab diffuses oxygen raws li ib tug tib molecule thiaj li yuav diffuse los ntawm daim nyias nyias. Piv nrog rau cov pa aeration txoj kev, MABR muaj ntau yam zoo:
Txawm li cas los xij, cov pa oxygen tuaj yeem raug xa ncaj qha mus rau biofilm, uas tuaj yeem txo cov pa oxygen hloov mus los ntawm cov kua theem thiab siv cov pa oxygen ntau dua 100%. Siv cov txheej txheem ib txwm muaj, qhov kev hloov pauv oxygen tsuas yog nce mus txog 1.5 kg / (kW·h), thaum nws tuaj yeem mus txog 6 kg / (kW·h).
◎ Nws yog ib qho chaw ruaj khov rau microbial kev loj hlob thiab kev loj hlob. Lub MABR aeration siv yog me me, ua yuav luag tsis muaj kev puas tsuaj rau cov kab mob uas txuas nrog rau daim nyias nyias fibers, uas stabilized microbial kev loj hlob.
◎ Qhov no aeration yog npuas tsis muaj npuas, tiv thaiv cov khoom tsis haum rau hauv huab cua feem ntau los ntawm npuas kom tsis txhob muaj kuab paug thib ob. Ntxiv mus, nws suppresses npuas tsim los ntawm microbial metabolism.
◎ Los ntawm kev kho cov pa oxygen yooj yim, cov pa paug uas tshwm sim los ntawm qhov tsawg kawg nkaus xav tau oxygen rau cov tshuaj tiv thaiv raug zam.
2. Los ntawm kev nthuav dav kev xav:
Thawj lub peev xwm ua tiav ntawm Hespeler cog yog 6,600 m3 / hnub. Tom qab kev txhim kho, lub peev xwm kho tau nce mus rau 9,320 m3 / hnub, nce 40%.
MABR cov cuab yeej yog compact, nyob qhov chaw me me, thiab tuaj yeem ntsia tau ncaj qha rau hauv cov tso tsheb hlau luam uas twb muaj lawm. Cov pa oxygen yog xaiv tau los ntawm daim nyias nyias rau cov npuas tsis muaj aeration, nrog rau kev ua haujlwm siab oxygen. Cov pa oxygen muab tau siv tag nrho los ntawm biofilm, ua rau kev siv cov pa oxygen siab heev thiab ua kom lub cev muaj zog biomass, ua tiav cov peev txheej cog tsis muaj kev nthuav dav.
Kev hloov kho MABR tuaj yeem ua rau muaj kev thauj khoom ntawm cov dej khib nyiab uas twb muaj lawm los ntawm 20%-40%, lossis ntau dua.
Kev hloov pauv cov pa oxygen hauv MABR yog qhov cuam tshuam rau kev hloov pauv ntawm ammonia nitrogen thiab organic teeb meem. Nitrifying kab mob tsim kev loj hlob nyob ze ntawm daim nyias nyias thiab muaj kev tiv thaiv los ntawm cov txheej txheem biofilm, uas tsis tsuas yog nce cov nitrification tus nqi tab sis kuj ua kom muaj kev ruaj ntseg ntawm nitrification. Qhov txiaj ntsig no tshwj xeeb tshaj yog tshwm sim hauv kev poob siab lossis thaum lub caij ntuj no txias.
Ua ntej kev txhim kho, lub caij ntuj no effluent ammonia nitrogen (nrog rau qhov ntsuas dej tsawg kawg nkaus ntawm 10 degree) tshaj li 5 mg / L tawm tus qauv; Tom qab kev txhim kho, cov dej ntws tau raws li tus qauv (lub caij ntuj no tso tawm <5 mg / L, lub caij ntuj sov txwv < 2 mg / L).
Tsis tas li ntawd, txhim kho MABR reactors nyob rau hauv anaerobic lossis anoxic tso tsheb hlau luam tso cai rau ib txhij nitrification thiab denitrification. Nyob rau hauv tib lub effluent tag nrho nitrogen tej yam kev mob, piv rau lwm yam nitrogen tshem tawm xws li A2O, nws txo qhov sib piv ntawm kev rov ua haujlwm sab hauv, txhim kho denitrification efficiency thaum txuag cov pa roj carbon thiab lub zog.
Peb Lub Ntsiab Tseem Ceeb cuam tshuam rau Membrane Aerated Biofilm Reactor (MABR)
1. Aeration Siab
Txij li thaum kev khiav hauj lwm siab hauv MABR yuav tsum nyob qis dua ntawm daim nyias nyias lub npuas taw tes, peb tau txais npuas-dawb aeration.
◎ Thaum lub siab qis dhau lawm, yuav tsis muaj cov pa oxygen txaus nyob rau hauv lub biofilm sab hauv, thiab yog li kev ua haujlwm ntawm aerobically nitrifying thiab heterotrophic kab mob yuav raug kev txom nyem.
◎ Thaum lub zog siab heev, tag nrho biofilm yuav ua rau aerobic, txhawb nqa cov kab mob anaerobic denitrifying thiab lwm yam anaerobes kom tsis txhob loj hlob thiab cuam tshuam rau cov txheej txheem denitrification.
Qhov tseeb, kev kho mob yuav tsum tau ua tiav hauv kev xyaum raws li qhov tsim nyog dej zoo siv raws li cov dej zoo.
2. Dej ntws nrawm
Nyob rau theem ntawm microbial txuas, qhov ntws tawm ntau dhau yuav cuam tshuam qhov kev loj hlob ntawm microbial thiab adhesion, yog li ntawd, tus nqi ntws tsis siab dhau ntawm theem no.
Thaum cov biofilm tsim, qhov nce hauv dej ntws nrawm txo cov kua ciam txheej tuab. Raws li biofilm thickness stabilizes thaum lub sijhawm ua haujlwm ruaj khov, ua kom nrawm nrawm txo cov ciam txheej tuab ntawm cov kua theem thiab txhawb nqa biofilm rov ua dua tshiab, uas txo cov biofilm thickness ntau dhau, ua rau cov pa oxygen thiab cov pa phem hloov pauv.
Cov dej ntws tawm nrawm yog ib qho ntawm qhov cuam tshuam rau kev loj hlob ntawm microbial thiab biofilm thickness, raws li kev tshawb fawb.
◎ Lub thinner ntawm ciam teb txheej yog vim qhov siab tshaj tawm thiab qhov sib txuam ruaj khov biofilm thickness.
◎ Ua kom muaj kuab paug degradation yuav tsum txo qis tshaj tawm, thicker ruaj khov biofilm, thiab ib tug thicker ruaj khov biofilm ntawm qis ntws tshaj tawm.
3. Carbon, Nitrogen, thiab Phosphorus Ratio hauv cov dej khib nyiab
Qhov tsim nyog C: N: P piv txhawb kev loj hlob ntawm microbial hauv MABR biofilm, ua kom yooj yim nitrification thiab denitrification hauv lub reactor.
◎ Nyob rau hauv cov ntaub ntawv ntawm tsawg C: N piv, cov organic carbon concentration yog tsis txaus kom tau raws li cov carbon qhov kev thov rau denitrification, cuam tshuam tag nrho cov nitrogen tshem tawm efficiency.
◎ Thaum qhov sib piv C: N siab dhau lawm, cov kab mob aerobic heterotrophic yuav loj hlob thiab siv cov pa ntau, txo cov pa oxygen concentration thiab cuam tshuam nitrification.
Plaub Daim Ntawv Thov Kev Sib Tham rau Membrane Aerated Biofilm Reactor (MABR)
- Kev kho cov dej ammonia-nitrogen siab
- Cov khoom siv sib xyaw ua ke rau kev kho dej hauv nroog nyob deb nroog
- Biological restoration ntawm cov dej hauv nroog
- Txhim kho cov chaw kho dej khib nyiab kom ua tau zoo dua
Qhov tseeb, nyob rau xyoo tas los no, MABR tau siv ntau ntxiv hauv cov chaw kho dej khib nyiab thoob ntiaj teb.
Piv txwv li, ntawm YBSD Wastewater Treatment Plant hauv Illinois, Tebchaws Asmeskas, 10 thawj aerobic bioreactors tau hloov kho rau 2 lub tso tsheb hlau luam anaerobic, 2 MABR anoxic tso tsheb hlau luam, thiab 6 lub tso tsheb hlau luam aerobic, nrog 12 MABR modules ntsia hauv cov tso tsheb hlau luam anoxic. Qhov no tau hloov pauv cov txheej txheem aerobic yav dhau los rau hauv cov txheej txheem tshem tawm nitrogen thiab phosphorus, ua tiav lub hom phiaj ntawm kev ua kom muaj peev xwm kho tau zoo thaum txhim kho lom nitrogen thiab phosphorus tshem tawm.
MABR system lub sijhawm biofilm acclimation tsuas yog 3 lub lis piam, thiab tom qab qhov kev kho dej khib nyiab tau ua haujlwm tiav, cov khoom muaj zog BOD5 tau nce mus rau 0.60 kg / (m3·hnub), nce 47% piv rau ua ntej. nce qib.
Cov nroj tsuag kawg effluent ua tau raws li tag nrho cov kev xav tau tsim, nrog effluent BOD5<10 mg/L, total suspended solids (TSS) < 10 mg/L, NH3-N < 1.5 mg/L, and TP < 1.0 mg/L. The average oxygen transfer rate (OTR) and oxygen transfer efficiency (OTE) were 10.8 g/(m2·day) and 33.3%, respectively.
Microbial pejxeem tsom xam ntawm biofilm tau pom tias cov kab mob ammonia-oxidizing (AOB) thiab cov kab mob nitrite-oxidizing (NOB) suav txog 40% ntawm cov neeg microbial, ntau dua plaub npaug ntau dua li cov txheej txheem activated sludge.
Ntxiv mus, piv rau CAS txheej txheem rau cov nroj tsuag ntawm tib lub teev (nrog rau kev nqis peev ntawm $ 25 lab thiab lub sijhawm tsim kho ntawm 2.5 xyoo), cov txheej txheem MABR tau nqis peev tsuas yog $ 5 lab thiab lub sijhawm tsim kho ntawm 1 xyoo, txo cov nqi thiab lub sijhawm tsim kho.