Tom qab cov txheej txheem AOA tab tom khiav, cov kev ntsuas twg yog qhov tseem ceeb tshaj plaws? Yuav kho lawv li cas?
Muaj qhov sib txawv tseem ceeb ntawm cov engineers thiab cov kws tshawb fawb. Cov kws tshawb fawb tuaj yeem sim nrog qhov ntsuas ib los ntawm ib qho, tswj cov xwm txheej rau lawv lub xeev zoo tagnrho, thiab siv lub hlis kom tau txais cov ntaub ntawv zoo meej. Cov engineers tsis tuaj yeem ua qhov no; Lub sijhawm ua haujlwm tsuas yog ob peb lub hlis xwb, dej yuav tsum tau ntxiv txhua hnub, thiab cov dej ntws tawm yuav tsum tau ua raws li cov qauv txhua hnub. Koj yuav tsum coj lub kaw lus mus rau qhov chaw ua haujlwm ruaj khov hauv lub sijhawm txwv. Koj yuav tsum paub dab tsi qhov tseem ceeb los teeb tsa thiab nyob rau hauv qhov kev taw qhia los kho.
Cov txheej txheem parameter ntawm AOA yog txawv los ntawm cov tsoos AAO - AAO tsis yog "ntau-coupled," nrog rau sab hauv reflux piv, sab nraud reflux piv, aeration tus nqi, thiab cov pa roj carbon ntau npaum li cas influencing ib leeg, ua rau kev hloov kho nyuaj heev. AOA tshem tawm cov yeeb nkab reflux sab hauv, ua rau qis qis ntawm qhov tsis sib xws, tab sis txhua qhov kev ntsuas muaj ntau yam kev cuam tshuam thiab kev nkag siab ntau dua. Qhov no tsis tau txhais hais tias AOA yog "yooj yim kho," tab sis qhov uas txhua qhov kev ntsuas yuav tsum tau kho kom meej dua.
Qhov ntim piv ntawm anaerobic rau aerobic rau thaj chaw anoxic yog ib qho kev ntsuas uas yuav tsum tau kho thaum lub sij hawm tsim qauv thiab yog qhov nyuaj rau kev kho kom zoo thaum lub sijhawm ua haujlwm -yog li ntawd, cov npoo txaus yuav tsum tau muab tso rau hauv qhov tsim.
Lub hauv paus pom zoo piv yog 1: 1: 3 mus rau 4. Nyob rau hauv qis C / N piv cov xwm txheej -C / N qis dua 3- nws raug pom zoo kom hloov mus rau 1.5: 1: 4, txuas ntxiv rau thaj tsam anaerobic kom cov kab mob muaj sijhawm txaus los khaws cov pa roj carbon monoxide. Hauv qhov qis- qhov kub thiab txias- dej kub hauv qab 15℃- nws raug pom zoo kom hloov mus rau 1: 1: 4 mus rau 5, txuas ntxiv rau thaj tsam anoxic kom tso cai rau lub sijhawm txaus rau kev ua kom tsis muaj zog endogenous.
Lub hauv paus ntsiab lus tseem ceeb yog qhov yooj yim: thaj tsam anoxic yog qhov chaw sib ntaus sib tua loj, yog li nws zoo dua kom loj dua. Lub cheeb tsam aerobic yuav tsum luv dua es ntev dua - ib cheeb tsam ntev pov tseg cov pa roj carbon monoxide, thaum ib cheeb tsam luv luv tuaj yeem them rov qab los ntawm kev nce aeration. Cov piv txwv no tsis yog qhov kev txiav txim siab tab sis muab los ntawm cov txiaj ntsig ntawm kev ntsuas tiag tiag thiab kev ua kom zoo tshaj plaws hauv ntau tus kws tsav dav hlau- nplai thiab cov teeb meem engineering. Thaum tsim koj lub cev, koj tuaj yeem pib los ntawm kev xa mus rau cov kev faib ua feem no thiab tom qab ntawd zoo - kho lawv raws li qhov muaj txiaj ntsig dej zoo.
** Thaum kawg Aerobic DO Concentration ** Qhov no yog qhov sib cav tseem ceeb tshaj plaws hauv kev ua haujlwm AOA.
High kawg aerobic DO ua kom muaj ammonia nitrification txaus-tab sis cov pa oxygen ntau dhau nkag mus rau thaj chaw anoxic siv cov pa roj carbon monoxide, ua rau txo qis denitrification. Tsawg kawg aerobic DO khaws cia cov pa roj carbon monoxide zoo-tab sis yuav ua rau tsis tiav nitrification thiab ntau dhau ammonia nitrogen nyob rau hauv cov effluent. Tus nqi pom zoo yog nyob nruab nrab ntawm 1.0 thiab 1.5 mg / L, "qhov chaw qab zib" txheeb xyuas los ntawm ntau qhov teeb meem engineering.
Cov ntaub ntawv tshawb fawb qhia tau hais tias thaum DO (solved oxygen) yog 1.0 mg/L, qhov endogenous denitrification tus nqi siab tshaj plaws nyob rau hauv lub post- anoxic zone; thaum DO ntau dua 2.0 mg / L, qhov muaj zog DO nyob rau hauv thaj chaw anoxic ho inhibits denitrification, thiab tag nrho cov nitrogen tshem tawm txo los ntawm 5% mus rau 10%; Thaum DO yog qis dua 0.5 mg / L, nitrification efficiency txo qis, thiab cov effluent ammonia nitrogen yuav dhau tus qauv.
Nov yog qhov yooj yim saib xyuas kev ua haujlwm nthuav dav: qib DO kawg hauv thaj chaw aerobic tsis tuaj yeem hloov kho yooj yim los ntawm kev hloov lub valve ntawm lub aerator kawg. Yog tias koj txo cov aeration ntawm pawg aerator kawg, qhov aeration ntawm cov aerators ua ntej tseem zoo ib yam, tab sis tag nrho DO faib nyob rau hauv aerobic cheeb tsam yuav hloov mus rau pem hauv ntej - DO thaum pib nce, thaum DO thaum kawg txo qis, thiab tag nrho qhov nruab nrab DO yuav nyob twj ywm tsis hloov. Txoj hauv kev kom raug yog los kho cov aeration faib thoob plaws hauv cheeb tsam aerobic, me ntsis nce aeration thaum pib kom ntseeg tau tias qhov pib nitrification sai thiab txo qis me ntsis thaum kawg kom txo qhov kawg DO. Qhov no yuav tsum muaj peev xwm tswj tau lub tshuab aeration hauv pab pawg; qhov qub -fashioned ib leeg- yeeb nkab aeration layout tsis tshua muaj txiaj ntsig hauv qhov xwm txheej no.
Sludge Retention Time (SRT)
AOA pom zoo rau SRT ntawm 20 txog 30 hnub. Vim li cas thiaj ntev? Vim tias DGAOs loj hlob qeeb dua li cov kab mob heterotrophic zoo tib yam. Ib qho luv luv SRT yuav ua rau lawv raug ntxuav tawm, tiv thaiv kev tsim ntawm endogenous denitrification peev xwm hauv lub cev. Cov kab mob endogenous denitrifying yuav tsum muaj lub hnub nyoog ntev sludge los khaws; qhov no yog txiav txim los ntawm lawv qhov "slow and meticulous" nature. Tsis tas li ntawd, ntev SRT txhais tau hais tias muaj sludge concentration, ib txwm ua rau tus nqi endogenous denitrification.
Txawm li cas los xij, ntev SRT tsis yog ib txwm zoo dua. Tom qab 35 hnub, cov sludge muaj hnub nyoog hnyav, nws cov khoom txo qis, thiab nws cov haujlwm txo qis, cuam tshuam tsis zoo rau kev kho mob. Hauv kev xyaum, SRT raug kho los ntawm kev tswj cov sludge tawm-thaum lub caij ntuj no thaum dej kub qis, SRT tuaj yeem txuas ntxiv kom tsim nyog thaum txo cov sludge tawm los them rau qhov txo qis nitrification.
Cov lus qhia tswv yim: Yog tias koj qhov TN (Tag Nrho Nitrogen Tolerance) tsis txo qis, tom qab txiav txim DO (Dissolved Oxygen) thiab HRT (Hydrogen Retention Time) teeb meem, xyuas SRT ua ntej. Ntau lub AOA tej yaam num, nyob rau hauv lawv thawj theem commissioning, muaj ib tug sludge turnover lub sij hawm (SRT) tsawg tshaj li 15 hnub. DGAOs (digestive gas oxidants) tseem tsis tau tsim lawv tus kheej ua ntej tso tawm, tiv thaiv lub cev los ntawm kev mus txog lub xeev ruaj khov. Txo cov sludge tawm tus nqi thiab tso cai rau SRT nce mus txog 25 hnub feem ntau ua rau tag nrho cov nitrogen (TN) pib poob.
Sludge Concentration (MLSS)
Qhov pom zoo MLSS rau AOA cov txheej txheem yog 3500 txog 5000 mg / L. Yog tias siv ib hom sludge rov qab, qhov txwv siab tshaj ntawm 4000 txog 5000 mg / L raug pom zoo kom them nyiaj rau biomass tsis txaus hauv thaj chaw anoxic. Yog tias siv dual sludge rov qab hom, nws tuaj yeem ua haujlwm ntawm qhov txwv qis ntawm 3500 txog 4500 mg / L.
Nco ntsoov tias MLSS siab dhau heev lawm- siab dua 6000 mg/L- yuav ua rau kom cov khib nyiab thauj khoom hauv lub tank thib ob, cuam tshuam sludge- dej sib cais. Nws yuav tsum tau txiav txim siab ua ke nrog kev suav cov sedimentation tank thib ob. Siab dua MLSS tsis yog ib txwm zoo dua; nrhiav kev sib npaug yog qhov tseem ceeb dua.
Tag Nrho Lub Sijhawm Hydraulic Retention (HRT)
Tag nrho HRT ntawm AOA (Automatic Aeration Unit) feem ntau yog nyob ntawm 12 txog 18 teev, nyob ntawm seb cov dej muaj txiaj ntsig zoo thiab cov qauv tso tawm. HRT no yeej zoo ib yam li ib txwm AAO (Auto-Aerated Aquarium), uas feem ntau yog 10 mus rau 16 teev- thiab tsis ua kom lub tank ntim ntau dua txawm tias ntxiv rau hauv denitrification.
Cov kev tshawb fawb tau pom tias thaum tag nrho HRT raug txo los ntawm 11 teev mus rau 5 teev, cov dej TN (Tag nrho Nitrogen Tag Nrho) tseem tuaj yeem khaws cia ntawm thaj tsam 7.5 mg / L- qhov no yog vim lub sij hawm aerobic luv luv, txo cov pov tseg ntawm cov pa roj carbon monoxide. Tau kawg, qhov no yog qhov kev sim siab heev, thiab cov kev ua haujlwm hnyav no tsis pom zoo hauv engineering, tab sis nws tsawg kawg yog qhia tau tias lub tank ntim kev siv tau zoo ntawm AOA yog qhov tseeb.
Qhov "Triangular" Kev Sib Raug Zoo Ntawm Cov Txheej Txheem
Thaum kawg, lub ntsiab lus tseem ceeb kom nkag siab yog qhov kev ua haujlwm ntawm AOA tsis raug cais tawm. Lawv zoo li peb txoj hlua sib txuas, ua ib qho "daim duab peb sab". Tsawg DO thaum kawg ntawm kev kho aerobic khaws cia cov pa roj carbon monoxide sab hauv, tab sis ammonia nitrogen yuav tsis ua raws li cov qauv; SRT ntev dua (Sediment Retention Time) ua rau muaj ntau dua DGAO tsub zuj zuj, tab sis sludge laus thiab cov khoom tsis zoo; siab MLSS (Mixed Liquefaction Suspension) tsub kom muaj peev xwm kho tau, tab sis ua rau kom muaj kev thauj khoom ntawm cov sedimentation tank thib ob. Kho ib qho parameter yuav tsum xav txog nws qhov cuam tshuam rau lwm qhov ob. Tsis muaj ib qho kev sib tw yeej; tsuas yog tus txheej txheem ntawm kev hloov kho tas li thiab nrhiav qhov sib npaug ntawm qhov taw tes.
Nws raug nquahu kom tsim kom muaj qhov ntsuas qhov ntsuas qhov nkhaus thaum lub sijhawm ua haujlwm -piv txwv li, kho DO, kho SRT, thiab saib TN cov kev hloov pauv; kho SRT, kho DO, thiab saib xyuas kev hloov pauv ntawm ammonia nitrogen. Kev siv cov ntaub ntawv yog qhov tseeb tshaj qhov kev cia siab ntawm kev paub dhau los. Tsis tas li ntawd, muaj lwm qhov parameter, txawm tias tsis tau teev nyob rau hauv parameter cov lus, uas yog ib qho tseem ceeb sib npaug - tus influent C/N piv. AOA (Acid-Oriented Oxygenation) yog qhov hloov tau zoo rau C / N piv, tab sis qhov no yuav tsum paub txog qhov muaj txiaj ntsig C / N piv tam sim no. Rau cov nroj tsuag uas tsis muaj COD online thiab TN saib xyuas, nws raug nquahu kom nruab lawv kom sai li sai tau, lossis tsawg kawg manually saib xyuas lawv txhua hnub. Nrog rau cov ntaub ntawv -time C/N ratio tiag tiag, koj tuaj yeem txiav txim siab seb lub kaw lus tam sim no puas muaj cov pa roj carbon txaus lossis tsis txaus, thiab yog li txiav txim siab seb puas yuav txo DO rau 1.0 lossis nce mus rau 1.5. Txawm hais tias qhov ntsuas no tsis tuaj yeem hloov kho ncaj qha hauv chav tswj, nws yog lub hauv paus rau kev kho txhua qhov kev ua haujlwm tsis zoo. Rau cov nroj tsuag nrog cov peev txheej, nws raug nquahu kom txuas cov ntaub ntawv los ntawm cov cuab yeej hauv online mus rau lub hauv paus tswj kev tswj hwm, cia li tsim cov kab kos duab sib txawv txhua hnub, tso cai rau cov neeg ua haujlwm pom qhov pom kev sib txuas los ntawm txhua qhov kev hloov pauv. Nyob rau hauv thawj theem commissioning, nws raug nquahu kom ua qhov kev ntsuas ntsuas txhua lub lim tiam, uas tuaj yeem txuas ntxiv mus rau txhua hli tom qab kev ua haujlwm ruaj khov. Sau cov parameter qhov tseem ceeb kho txhua lub sijhawm thiab cov kev hloov pauv ntawm cov dej tsis zoo. Tom qab peb lub hlis, koj yuav muaj koj tus kheej cov ntaub ntawv kev paub, uas yog ntau txhim khu kev qha tshaj li xa mus rau cov ntaub ntawv thiab lwm tus neeg cov ntaub ntawv.
Cov dej zoo ntawm txhua tsob nroj yog qhov sib txawv, thiab cov ntsiab lus ntawm qhov ntsuas qhov ntsuas yuav sib txawv. Txawm li cas los xij, cov kev taw qhia dav dav zoo ib yam - tsom mus rau thaj chaw anoxic, tswj hwm thaj chaw aerobic, thiab tso cai rau lub sijhawm SRT txaus. Los ntawm kev tuav cov lus qhia tseem ceeb no, kev sib txawv me me yuav tsis ua rau lub cev tawg.