Kev soj ntsuam ntawm kev tshem tawm cov pa phem hauv cov dej khib nyiab siv qhov hloov kho AAO System
Txheej txheem cej luam
CovAnaerobic-Anoxic-Oxic (AAO lossis A²/O)txheej txheem yog ib tug dav saws daws cov dej khib nyiab technology tsim rau ib txhij tshem tawm cov organic carbon, nitrogen, thiab phosphorus. Nws muaj peb thaj chaw sib txuas:
- Anaerobic Zone: Tsis muaj oxygen thiab nitrate, cov kab mob facultative zom cov organic tebchaw, tso phosphorus.
- Anoxic Zone: Cov kab mob denitrifying siv cov pa roj carbon monoxide ua cov khoom siv hluav taws xob los txo cov nitrates / nitrites (rov qab los ntawm thaj chaw oxic) rau hauv cov pa roj nitrogen, ua tiav cov nitrogen tshem tawm.
- Oxic Zone: Cov kab mob aerobic oxidize cov organic uas tseem tshuav thiab pab cov nitrification (ammonia rau nitrate), thaum phosphorus{0}} cov kab mob sib sau ua ke phosphates.
Hauv kev kho dej khib nyiab, thaum AAO cov txheej txheem ib txwm tuaj yeem tshem tawm cov pa phem los ntawm cov dej phwj tuaj, qhov sib xyaw ua ke ntawm cov dej khib nyiab tau ua rau muaj qee qhov kev poob qis hauv kev kho cov txheej txheem AAO. Txhawm rau kom ntseeg tau tias qib kev thov thiab kev ua tau zoo ntawm cov txheej txheem AAO,Nws yog ib qho tsim nyog los ua cov kev tshawb fawb tshwj xeeb ntawm cov kev hloov kho, uas tuav cov tswv yim tseem ceeb rau cov tuam txhab lag luam thiab cov tuam haujlwm hauv kev txhim kho lawv cov kev ua haujlwm zoo.
Modified AAO System
1. Cov Ntsiab Cai ntawm AAO System
Noj AAO qhov kev kho dej khib nyiab hauv ib qho chaw kho dej khib nyiab tshwj xeeb ua piv txwv, cov kab ke uas twb muaj lawm yog acov txheej txheem AAO, feem ntau muaj plaub yam:Ib lub tank anaerobic, lub tank aerobic, lub tank anoxic, thiab lub tank thib ob, raws li tau piav qhia hauvDaim duab 1.
Nyob rau hauv cov pa AAO system, kab mob loj hlob thiab metabolize nyob rau hauv ntau yam tej yam kev mob. Los ntawm kev sib cuam tshuam ntawm cov zej zog sib txawv microbial, kev tshem tawm cov pa phem tau ua tiav los ntawm kev siv tshuaj lom neeg xws li ammonification, nitrification, thiab denitrification, uas tshem tawm cov pa phem ntau.
Cov txheej txheem AAO cov qauv muaj qhov zoo xws li cov nqi qis, kev ua haujlwm yooj yim, thiab lub sijhawm luv hydraulic tuav (HRT). Txawm li cas los xij, nws kuj raug kev txom nyem los ntawm qhov tsis zoo suav nrogtsis zoo phosphorus tshem tawm efficiencythiabCov kev cai nruj rau cov hnub nyoog sludge thiab carbon qhov tsim, ua rau nws nyuaj kom ua tau raws li cov qauv kev xav tau hauv qee qhov dej khib nyiab tshem tawm cov haujlwm.
2. Tsim Kev Ntsuam Xyuas ntawm Hloov Kho AAO System
Raws li kev tshawb fawb yav dhau los, kev txhim kho tau ua rau cov qauv AAO, feem ntau tsom rau lub tank anaerobic. Covhloov kho anaerobic tank systemmuaj peb ntu:ib qho sludge-dej sib tov cheeb tsam, ib qho sludge-dej cais cheeb tsam, thiab ib cheeb tsam xov xwm, raws li qhia hauvDaim duab 2.
Hauvmodified AAO system (Daim duab 3), cov sludge -dej sib tov cheeb tsam thiab cheeb tsam xov xwm yog tsim los nrog zoo tib yam qhov ntev (15 cm ntev × 20 cm dav × 60 cm qhov siab), txhua tus muaj ib tug zoo ntim ntawm 9 L. Lub sij hawm hydraulic retention (HRT) rau ob qho tib si sludge zone thiab media zone yog 2 teev.
3. Kev soj ntsuam ntawm COD Tshem Tawm Kev Ua Tau Zoo hauv Kev Hloov Kho AAO System
Cov tshuaj oxygen xav tau (COD) tshem tawm kev ua haujlwm ntawm kev hloov kho AAO tau txheeb xyuas. Thaum lub zog COD yog 447 mg / L, cov effluent COD los ntawm cov theem anaerobic yog kwv yees li 147 mg / L, thiab qhov kawg effluent COD yog 42 mg / L, ua tau raws li Class A paug tus qauv. COD tshem tawm kev ua haujlwm tau zoo nyob rau theem anaerobic thaum ntxov tsis ruaj khov, nrog kev hloov pauv tseem ceeb thiab cov dej cawv uas tsis tshua muaj kev tshem tawm cov khib nyiab (MLSS). Txawm li cas los xij,Tom qab 7 hnub, qhov kev tshem tawm tau ruaj khov ntawm 94%. Cov theem anaerobic feem ntau tshem tawm cov pa phem los ntawm microbial degradation thiab dilution los ntawm reflux, ua kom pom cov pa phem tshem tawm.
Siv Minitab software, kev tshem tawm kev ua tau zoo ntawm cov kev hloov kho thiab cov qauv AAO tau muab piv los ntawm cov qauv ywj pheej t- kev tshuaj ntsuam xyuas, nrog cov txiaj ntsig tau pom hauvDaim duab 4.
Ntawm 95% kev ntseeg siab ib ntus, t- tus nqi yog 0.26, thiab p- tus nqi yog 0.605. Cov ntaub ntawv txheeb xyuas qhia tias tsis muaj qhov sib txawv tseem ceeb hauv kev tshem tawm cov nqi ntawm ob lub tshuab. Cov kev hloov kho AAO tau pom muaj qhov sib txawv ntawm COD tshem tawm kev ua tau zoo, feem ntau yog vim qhov sib txawv ntawm - cov ntaub ntawv theem pib, suav nrog rau theem acclimation.Zuag qhia tag nrho, cov kev hloov kho AAO tau pom zoo tshem tawm COD.
4. Kev soj ntsuam ntawm Ammonia Nitrogen tshem tawm Efficiency hauv Modified AAO System
Cov tshuaj ammonia nitrogen (NH₃-N) tshem tawm tau raug tshuaj xyuas. Thaum lub zog NH₃-N concentration yog 36 mg/L, cov dej NH₃-N los ntawm theem anaerobic yog kwv yees li 19 mg/L. Nyob rau hauv thaum ntxov ua sawv, lub effluent concentration yog kuj siab, thiab tshem tawm efficiency fluctuated ho. Txawm li cas los xij,Tom qab 12 hnub ntawm acclimation, qhov kev tshem tawm tau nce mus txog 81%, nrog nitrifying kab mob nyob rau hauv lub logarithmic kev loj hlob theem.Tom qab ntawd, qhov kev tshem tawm tau ruaj khov, nce mus txog qhov nruab nrab ntawm 93%, nrog rau NH₃{0}}N concentration ntawm 4 mg/L, ua tau raws li tus qauv tso tawm Class A.
Ntawm 95% kev ntseeg siab ib ntus, t- tus nqi yog 3.41, thiab p- tus nqi yog 0.998. Cov ntaub ntawv txheeb xyuas qhia tias tsis muaj qhov sib txawv tseem ceeb hauv kev tshem tawm cov nqi ntawm ob lub tshuab. Cov kev hloov kho AAO tau pom muaj qhov sib txawv ntawm NH₃-N tshem tawm kev ua tau zoo, feem ntau yog vim qhov sib txawv ntawm cov ntaub ntawv thaum ntxov- theem, suav nrog theem acclimation.Zuag qhia tag nrho, cov kev hloov kho AAO tau pom tias muaj txiaj ntsig zoo NH₃-N tshem tawm.
5. Kev soj ntsuam ntawm Tag Nrho Phosphorus thiab Tag Nrho Nitrogen Tshem Tawm Efficiency hauv Modified AAO System
5.1 Tag Nrho Phosphorus Tshem Tawm Efficiency
Tag nrho cov phosphorus (TP) tshem tawm efficiency tau txheeb xyuas. Thaum qhov muaj zog TP concentration yog 3.6 mg / L, yuav tsum muaj 11-hnub acclimation lub sijhawm. TP concentration ntawm tag nrho cov system mus txog 2.8 mg / L, thaum lub sij hawm anaerobic effluent TP concentration yog 4.2 mg / L, qhia tau hais tias tseem ceeb phosphorus tso tawm. Tom qab acclimation, TP tshem tawm kev ua tau zoo dua qub, nrog rau theem anaerobic effluent TP concentration txo mus rau 2.7 mg / L thiab qhov kev tshem tawm tau nce mus txog 17%.Nyob rau theem tom ntej, TP tshem tawm tus nqi ruaj khov siab dua 60%, thiab TP concentration nce mus txog 0.5 mg / L., ua tau raws li Class B tso tawm tus qauv.
Kev sib piv ntawm ob lub tshuab tau pom tias qhov kev hloov kho AAO yuav tsum muaj lub sijhawm pib ua haujlwm nrog kev tshem tawm qis dua. Txawm li cas los, tom qab acclimation,nws cov TP tshem tawm kev ua tau zoo tau zoo dua qub, ua kom pom kev ua tau zoo dua qub piv rau cov qauv AAO.
5.2 Tag Nrho Nitrogen Tshem Tawm Efficiency
Tag nrho cov nitrogen (TN) tshem tawm efficiency tau txheeb xyuas. Thaum qhov muaj zog TN concentration yog 34 mg / L, anaerobic theem TN concentration yog kwv yees li 18 mg / L. Nyob rau hauv thaum ntxov ua sawv, lub effluent concentration yog kuj siab, thiab tshem tawm efficiency fluctuated ho.Tom qab 10 hnub ntawm acclimation, TN tshem tawm tus nqi tau nce mus rau 68%, nrog rau cov effluent concentration ntawm 9 mg / L., ua tau raws li tus qauv tso tawm Class A.
Ntawm 95% kev ntseeg siab ib ntus, t- tus nqi yog 0.72, thiab p- tus nqi yog 0.753. Cov ntaub ntawv txheeb xyuas qhia tias tsis muaj qhov sib txawv tseem ceeb hauv kev tshem tawm cov nqi ntawm ob lub tshuab. Cov kev hloov kho AAO tau pom muaj qhov sib txawv ntawm TN tshem tawm kev ua tau zoo, feem ntau yog vim qhov sib txawv ntawm cov ntaub ntawv thaum ntxov -, suav nrog rau theem acclimation.Zuag qhia tag nrho, qhov hloov kho AAO tau pom tias muaj txiaj ntsig zoo tshem tawm TN.
Xaus
Hauv cov ntsiab lus, qhov hloov kho AAO qhia tau tias muaj kev ua tau zoo hauv kev tshem tawm cov dej khib nyiab tseem ceeb -COD, ammonia nitrogen, tag nrho nitrogen, thiab tag nrho phosphorus- raws li cov qauv kev tso tawm hauv chav kawm A lossis B tom qab lub sijhawm luv luv.
Txawm hais tias kev txheeb xyuas kev txheeb xyuas (t-test, p- tus nqi) tsis muaj qhov sib txawv tseem ceeb hauv kev tshem tawm cov txiaj ntsig zoo piv rau cov qauv siv, qhov kev hloov kho tau pom muaj kev ruaj ntseg dua thiab txhim kho cov txiaj ntsig kev kho mob nyob rau lub sijhawm, txawm hais tias muaj cov ntaub ntawv sib txawv ntau dua thaum pib ua haujlwm. Cov kev txhim kho, tshwj xeeb tshaj yog nyob rau hauv cheeb tsam anaerobic nrog optimized mixing, sib cais, thiab media zones, pab txhawb kom muaj zog cov txheej txheem resilience thiab efficiency.
Cov kev tshawb pom no underscoreLub peev xwm ntawm kev hloov kho AAO systems los daws cov dej khib nyiab nyuaj kom zoo, txhawb lawv cov kev siv tswv yim rau kev txhim kho cov kev kho mob uas twb muaj lawm.