Kev soj ntsuam ntawm qhov cuam tshuam ntawm Kev Pab Cuam Oxygen nyob rau hauv Aerobic Zone ntawm AAO txheej txheem ntawm kev tshem tawm cov pa phem
Txheej txheem cej luam
Cov txheej txheem AAO yog cov cuab yeej siv kho dej khib nyiab dav siv, feem ntau suav nrog theem anaerobic, anoxic, thiab aerobic theem, uas ua haujlwm sib koom ua ke kom tshem tawm cov pa phem ntawm cov dej khib nyiab. Cov theem aerobic yog ib qho tseem ceeb ntawm cov txheej txheem AAO, thiab cov txheej txheem ntawm cov pa oxygen ncaj qha cuam tshuam rau kev ua haujlwm ntawm tag nrho lub cev. Txhawm rau txhim kho qhov ua tau zoo ntawm cov txheej txheem AAO hauv kev siv tswv yim, cov kws tshawb fawb tau thov kom muaj cov txheej txheem pa oxygen. Los ntawm kev tsim ntau thaj chaw nrog ntau qhov sib txawv ntawm cov pa oxygen (DO) ntau nyob rau hauv lub cev, lub tswv yim no yog txhawm rau txhim kho cov metabolism hauv cov kab mob aerobic microorganisms thiab txhim kho cov pa phem tshem tawm. Yog li ntawd, kev txheeb xyuas qhov cuam tshuam ntawm cov pa oxygen nyob rau hauv thaj chaw aerobic ntawm AAO txheej txheem ntawm kev tshem tawm cov pa phem muaj txiaj ntsig tseem ceeb.
Txheej txheem cej luam ntawm Staged Oxygen Supply nyob rau hauv Aerobic Zone ntawm AAO txheej txheem
Qhov chaw aerobic yog thawj qhov chaw rau oxidation thiab decomposition ntawm cov organic teeb meem. Los ntawm theem cov pa oxygen, DO concentrations nyob rau hauv ib cheeb tsam sib txawv tuaj yeem hloov kho tau yooj yim raws li qhov degradation ntawm cov organic teeb meem thiab cov pa oxygen xav tau ntawm cov kab mob, kom ntseeg tau tias tsis sib xws thiab txaus degradation ntawm cov organic teeb meem thoob plaws ib cheeb tsam. Txoj hauv kev no pab txhim kho cov nqi tshem tawm cov organic thiab txhim kho cov dej ntws zoo. Hauv thaj chaw aerobic, ammonia nitrogen yog oxidized rau nitrate los ntawm cov kab mob nitrifying. Cov pa oxygen theem ua kom cov kab mob nitrifying ua haujlwm tau zoo raws li qhov tsim nyog DO concentrations, tsis txhob cuam tshuam rau cov txheej txheem nitrification tshwm sim los ntawm ntau dhau los yog qis DO. Nyob rau tib lub sijhawm, los ntawm kev tswj hwm qhov sib piv ntawm qhov sib piv thiab cov cawv sib xyaw ua ke, cov txheej txheem nitrification tuaj yeem ua tau zoo ntxiv, txhim kho ammonia nitrogen tshem tawm efficiency. Cov txheej txheem AAO ua ib txhij tshem tawm nitrogen thiab phosphorus. Nyob rau hauv cov txheej txheem oxygen mov hauv thaj chaw aerobic, phosphorus- cov kab mob sib sau ua ke (PAOs) tuaj yeem nqus tau phosphorus nyob rau hauv qhov tsim nyog DO concentrations thiab ua tiav phosphorus tshem tawm los ntawm kev tso tawm phosphorus - nplua nuj sludge nyob rau theem tom ntej. Lub caij no, los ntawm kev kho cov kev ua haujlwm tsis zoo hauv thaj chaw anoxic thiab aerobic, cov txheej txheem denitrification tuaj yeem ua kom zoo, txhim kho tag nrho cov kev tshem tawm nitrogen.
Kev Tshawb Fawb Kev Tshawb Fawb Txog Kev Tshawb Fawb Txog Kev cuam tshuam ntawm Staged Oxygen Supply on Pollutant Removal Efficiency
Thaum lub sij hawm kev sim, txoj kev xws li aeration valve tswj systems, tsis siv neeg tswj systems, thiab cov xov tooj ntawm blower li tau siv los tswj aeration siv, yog li xav txog DO concentration. Cov txheej txheem khiav ntawm kev sim teeb tsa tau qhia hauvDaim duab 1.
Raws li pom nyob rau hauv daim duab 1, lub aerobic cheeb tsam ntawm AAO system muab faib ua peb cheeb tsam: lub taub hau, nruab nrab, thiab tus Tsov tus tw. Lub sijhawm hydraulic tuav (HRT) ntawm qhov system tau teem rau 2 teev. Lub reactor qhov ntev yog 160 cm × 125 cm × 100 cm (ntev × dav × qhov siab), nrog rau ib tug sib tov cawv qhov siab teem ntawm 60 cm. Flow kev taw qhia ntawm cov tshuaj tiv thaiv tso tsheb hlau luam tau tswj los ntawm kev qhia cov phab ntsa thiab baffles.
Cov qauv ntawm cov dej khib nyiab tau sau los ntawm lub hauv paus sedimentation tank ntawm lub nroog qhov chaw kho dej khib nyiab. Cov dej khib nyiab zoo kuj ruaj khov, nrog rau tag nrho cov ntsuas ntsuas hauv cov qauv: TP concentration ranged ntawm 3.0 txog 5.5 mg / L, TN concentration ntawm 26 txog 49 mg / L, thiab COD los ntawm 255 txog 485 mg / L.
Txhua ntu aerobic tau nruab nrog lub twj tso kua mis vortex thiab ib qho ntawm nws tus kheej configured perforated yeeb nkab system los tsim lub aeration system rau aeration ua hauj lwm. Thaum lub sijhawm ua haujlwm, txhua lub vortex cua twj tso kua mis ua haujlwm ntawm nws tus kheej thiab ruaj khov, tswj DO concentrations nyob rau hauv thaj tsam ntawm 4–5 mg / L, 3–4 mg / L, thiab 2–3 mg / L, feem. Cov DO concentrations thiab effluent zoo los ntawm cov seem sib txawv tau ntsuas thiab soj ntsuam los txiav txim seb qhov tshwj xeeb cuam tshuam rau kev tshem tawm cov pa phem.
3 Kev tshuaj xyuas qhov cuam tshuam ntawm Lub Taub Hau Tshooj DO Kev Cuam Tshuam ntawm Kev Tshem Tawm Cov Khoom Uas Muaj Cai
3.1 COD Tshem Tawm Kev Ntsuas Ua Haujlwm
Kev soj ntsuam ntawm COD tshem tawm hauv lub taub hau ntawm AAO aerobic zone nyob rau hauv peb qhov sib txawv DO concentration pom pom cov txiaj ntsig COD ntawm 41.2, 40.2, thiab 40.8 mg / L, nrog rau kev tshem tawm ntawm 91.3%, 90.5%, thiab 90.8%, feem. Cov ntsiab lus tshwj xeeb muaj nyob hauvDaim duab 2.
Cov ntaub ntawv txheeb xyuas qhia tau hais tias thaum COD tshem tawm kev ua tau zoo nyob rau hauv lub taub hau ntu sib txawv rau qee qhov raws li qhov sib txawv DO concentrations, tag nrho cov kev hloov pauv yog tsawg thiab tsis qhia meej txog kev sib raug zoo. Thaum DO concentration nce ntawm 2-3 mg / L mus rau qib 3-4 mg / L, effluent COD thiab kev tshem tawm cov txiaj ntsig tau txo qis los ntawm 1.0 mg / L thiab 0.8%, feem. Txawm li cas los xij, thaum DO concentration nce mus rau qib 4-5 mg / L, COD effluent thiab tshem tawm efficiency nce 0.6 mg / L thiab 0.3%, feem. Qhov sib txawv DO concentrations tsis cuam tshuam rau COD tshem tawm efficiency.
3.2 TN Tshem Tawm Kev Ntsuas Ua Haujlwm
Kev soj ntsuam ntawm TN tshem tawm hauv lub taub hau tau pom cov TN concentrations ntawm 12.8, 12.3, thiab 13.1 mg / L raws li peb DO, nrog rau kev tshem tawm ntawm 68.0%, 66.8%, thiab 67.7%, feem.
Cov ntaub ntawv tsom xam qhia tias TN tshem tawm kev ua tau zoo nyob rau hauv lub taub hau ntu sib txawv rau qee qhov raws li qhov sib txawv DO ntau, tab sis tag nrho qhov sib txawv yog tsawg thiab tsis pom qhov sib txheeb meej. Yog li, nws tuaj yeem txiav txim siab tias qhov sib txawv DO concentrations tsis cuam tshuam rau TN tshem tawm kev ua haujlwm.
3.3 TP Tshem Tawm Kev Ntsuas Ua Haujlwm
Kev soj ntsuam ntawm TP tshem tawm hauv lub taub hau tau pom TP concentrations ntawm 0.60, 0.51, thiab 0.48 mg / L raws li peb DO, nrog rau kev tshem tawm ntawm 88.1%, 90.7%, thiab 91.7%, feem.
Cov ntaub ntawv txheeb xyuas qhia tau hais tias TP tshem tawm kev ua haujlwm hauv lub taub hau sib txawv nrog DO concentration. Ua kom DO concentration txo TP concentration thiab txhim kho kev tshem tawm ntxiv. Yog li, nws tuaj yeem xaus lus tias DO concentration ntawm 4-5 mg / L tau ua tiav qhov kev tshem tawm siab tshaj plaws.
Kev tsom xam pom tau hais tias kev teeb tsa DO concentration nyob rau hauv lub taub hau ntu mus rau qib 4-5 mg / L ua rau muaj phosphorus uptake efficiency.
4 Kev soj ntsuam ntawm qhov cuam tshuam ntawm Middle Section DO Concentration on pollutant Removal Efficiency
4.1 COD Tshem Tawm Kev Ntsuas Ua Haujlwm
Kev soj ntsuam ntawm COD tshem tawm hauv ntu nruab nrab tau pom cov txiaj ntsig COD ntawm 39.9, 38.9, thiab 40.4 mg / L raws li peb qhov DO, nrog rau kev tshem tawm ntawm 91.0%, 90.9%, thiab 91.2%, feem. Cov ntsiab lus tshwj xeeb muaj nyob hauvDaim duab 3.
Cov ntaub ntawv txheeb xyuas qhia tau hais tias thaum COD tshem tawm kev ua tau zoo nyob rau hauv nruab nrab ntu sib txawv rau qee qhov raws li qhov sib txawv DO concentrations, tag nrho cov kev hloov pauv yog tsawg thiab tsis pom qhov sib txheeb meej. Thaum DO concentration tau nce los ntawm 2-3 mg / L mus rau 3-4 mg / L, effluent COD thiab kev tshem tawm efficiency txo los ntawm 1.0 mg / L thiab 0.1%, feem. Txawm li cas los xij, thaum DO concentration nce mus rau qib 4-5 mg / L, COD effluent thiab tshem tawm efficiency nce 0.5 mg / L thiab 0.3%, feem. Qhov sib txawv DO concentrations tsis cuam tshuam rau COD tshem tawm efficiency.
4.2 TN Tshem Tawm Kev Ntsuas Ua Haujlwm
Kev soj ntsuam ntawm TN tshem tawm hauv nruab nrab ntu pom cov TN concentrations ntawm 13.8, 13.0, thiab 12.9 mg / L raws li peb qhov DO, nrog rau kev tshem tawm ntawm 62.5%, 66.3%, thiab 66.4%, feem. Piv txwv li, DO concentration ntawm 3–4 mg / L thiab 4–5 mg / L ua rau TN tshem tawm tau zoo dua.
4.3 TP Tshem Tawm Kev Ntsuas Ua Haujlwm
Kev soj ntsuam ntawm TP tshem tawm nyob rau hauv nruab nrab seem pom TP concentrations ntawm 0.57, 0.52, thiab 0.46 mg / L raws li peb DO, nrog rau kev tshem tawm ntawm 88.5%, 90.8%, thiab 91.5%, feem. Piv txwv li, DO concentration ntawm 3–4 mg / L thiab 4–5 mg / L ua rau TP tshem tawm tau zoo dua.
Kev tsom xam pom tau hais tias kev teeb tsa DO concentration nyob rau hauv nruab nrab ntu mus rau qib 3-4 mg / L ua tiav kev tshem tawm cov pa phem ntau dua.
Kev tsom xam ntawm qhov cuam tshuam ntawm Tail Section DO Concentration ntawm Pollutant Removal Efficiency
5.1 COD Tshem Tawm Kev Ntsuas Ua Haujlwm
Kev soj ntsuam ntawm COD tshem tawm hauv ntu ntu tau pom qhov kev tshem tawm ntawm 91.8% nyob rau hauv tag nrho peb DO concentration. Qhov sib txawv DO concentrations tsis cuam tshuam rau COD tshem tawm efficiency.
5.2 TN Tshem Tawm Kev Ntsuas Ua Haujlwm
Kev soj ntsuam ntawm TN tshem tawm hauv ntu ntu tau pom tias muaj TN ntau npaum li cas ntawm 11.5, 12.7, thiab 13.4 mg / L raws li peb qhov DO, nrog rau kev tshem tawm ntawm 72.7%, 67.9%, thiab 66.5%, feem. Piv txwv li, DO concentration ntawm 2-3 mg / L ua rau TN tshem tawm tau zoo dua.
5.3 TP Tshem Tawm Kev Ntsuas Ua Haujlwm
Kev soj ntsuam ntawm TP tshem tawm hauv ntu ntu tau pom tias thaum DO concentration qis dua 2.0 mg / L, kev tshem tawm tsis tshaj 96%. Hauv qhov kev sim no, tus nqi tshem tawm raws li tag nrho peb DO cov xwm txheej yog 90%, thiab cov dej ntws tawm tau raws li tus qauv tseem ceeb.
Hauv cov ntsiab lus, kev teeb tsa DO concentration hauv ntu ntu mus rau qib 2-3 mg / L ua tiav kev tshem tawm cov pa phem ntau dua.
Xaus
Txhawm rau tshawb xyuas qhov cuam tshuam tshwj xeeb ntawm cov pa oxygen nyob rau hauv thaj chaw aerobic ntawm AAO txheej txheem ntawm kev tshem tawm cov pa phem, thaj chaw aerobic tau muab faib ua lub taub hau, nruab nrab, thiab tus Tsov tus tw thaum kawm. Kev soj ntsuam ntawm COD, TN, thiab TP tshem tawm cov txiaj ntsig thoob plaws cov ntu no, ua ke nrog cov txiaj ntsig kev tshawb fawb, qhia tau hais tias kev teeb tsa DO concentration theem hauv peb thaj chaw aerobic mus rau 4–5 mg / L, 3–4 mg / L, thiab 2–3 mg / L, raws li, ua tiav zoo dua tag nrho cov pa phem tshem tawm. Txoj hauv kev no tuaj yeem muab kev txhawb nqa thiab siv rau kev tiv thaiv ib puag ncig ecological, kev txuag hluav taws xob, thiab kev siv zog txo qis.