Kev kho dua tshiab thiab kho dua tshiab ntawm Kev Kho Dej Nroj Tsuag nrog A2 / O-MBBR txheej txheem
Nrog rau kev nce ntxiv hauv pej xeem ib puag ncig kev paub, cov chaw kho dej khib nyiab yuav tsum tau ua haujlwm kho dua tshiab thiab kho dua tshiab, siv cov thev naus laus zis los kho cov dej khib nyiab, ua tiav cov dej khib nyiab rov qab siv dua, thiab pab txhawb lawv txoj kev loj hlob mus rau kev sib raug zoo. Ib qho kev sib tw loj uas tau ntsib thaum txhim kho thiab kho dua tshiab ntawm cov chaw kho dej khib nyiab yog kev tshem tawm nitrogen thiab phosphorus. Los ntawm kev siv MBBR thev naus laus zis, qhov teeb meem no tau daws tau zoo. Daim ntawv no tsom mus rau lub nroog cov chaw kho dej khib nyiab hauv nroog Xichou, uas siv cov txheej txheem ua ntej ua ntej + A2 / O txheej txheem kev kho mob thib ob + cov ntaub ntawv xov xwm pom + sodium hypochlorite tshuaj tua kab mob. Cov khoom siv tshuaj lom neeg siv cov khoom siv kho dej khib nyiab sib xyaw ua ke (xws li lub tank ua ntej- anoxic tank, anaerobic tank, anoxic tank, aerobic tank, inclined tube sedimentation tank, ntaub xov xwm lim, thiab tshuaj tua kab mob tank).
1 Project Overview
Kev tsim kho cov kav dej phwj tuaj txhawb nqa lub nroog cov dej khib nyiab hauv nroog Xichou, Wenshan Zhuang thiab Miao Autonomous Prefecture, Yunnan Province, suav nrog cov haujlwm hauv rau lub nroog: Dongma, Lianhuatang, Banggu, Fadou, Bolin, thiab Xinmajie. Tag nrho qhov ntev ntawm kev txhawb nqa cov kav dej phwj hauv cov nroog no yog kwv yees li 39.182 km, nrog cov yeeb nkab txoj kab uas hla ntawm DN200 mm txog DN500 mm, siv High-Density Polyethylene Ob Chav Phab Ntsa Corrugated Pipes (HDPE). Integrated pumping stations yog tsim nyob rau hauv Lianhuatang thiab Xinmajie lub zos. Hauv Xinmajie Township, muaj Q=25 m³ / h, DN150 mm siab dej PE yeeb nkab ntawm 50 m, thiab hauv Lianhuatang Township, ib Q=25 m³ / h, DN200 mm siab dej PE yeeb nkab ntawm 15 m. Tag nrho cov kev tsim kho ntawm cov chaw kho dej khib nyiab yog 3,482 m², suav nrog lub tsev tsim kho, cov cuab yeej siv dej khib nyiab sib xyaw, chav hloov pauv thiab faib khoom, chav saib xyuas, lub tank tswj, sludge tank, rov siv dej tank, sludge dewatering chav thiab sludge cia tso, tshuaj ntsuam channel, nqa twj tso kua mis, thiab lub tank xwm txheej.
2 Kev soj ntsuam dej zoo thiab xaiv cov txheej txheem tseem ceeb
2.1 Cov dej muaj txiaj ntsig thiab muaj txiaj ntsig zoo
Kev tsom xam ntawm cov dej muaj txiaj ntsig zoo ntawm lub nroog Xichou County cov chaw kho dej khib nyiab qhia tau hais tias nws cov concentration yog qhov ruaj khov nrog kev poob qis me ntsis. Raws li cov txheej txheem tam sim no yog qhov ua tau zoo - cov txheej txheem kho dej khib nyiab, qhov ntim ntawm cov tso tsheb hlau luam tsis loj, thiab nws txoj kev ua siab ntev rau kev poob siab tsis muaj zog. Yog li ntawd, tus nqi lav tus qauv rau cov ntsuas dej muaj txiaj ntsig tsis tuaj yeem teeb tsa siab dhau; lub sij hawm no nws yog teem rau 90%. Tsis tas li ntawd, cov nroj tsuag tau txais 500 m³ ntawm cov dej khib nyiab txhua hnub. Thaum tsim cov dej zoo kawg nkaus, nws yog ib qho tsim nyog yuav tsum tau cia siab rau tag nrho cov qauv ntawm cov dej zoo kom ua tiav cov haujlwm tsim nyog. Cov ntsuas dej zoo yog qhia hauvTable 1.
BOD₅ / CODcr piv rau hauv cov dej khib nyiab yog 0.35, qhia tau yooj yim biodegradable dej khib nyiab; BOD₅ / TN piv yog 3. Yuav kom ua tau raws li TN tus qauv, yuav tsum muaj kev kho mob ntxiv, xws li ntxiv cov pa roj carbon monoxide; BOD₅ / TP piv yog 26.3, uas yog tsim rau lom phosphorus tshem tawm.
Tam sim no, cov nyiaj seem ntawm NH₃-N thiab TN yog qhov siab, thiab qhov kev tshem tawm tsis zoo. Qhov no qhia tau hais tias nitrification ntawm NH₃-N tsis tuaj yeem ua tiav hauv lub tank qub aerobic. Txij li thaum lub tank anoxic tsis tau teeb tsa thawj zaug, cov txheej txheem denitrification tsis tshwm sim. Nitrogen tshem tawm tsuas yog ua tiav los ntawm kev tso tawm cov sludge ntau dhau, thiab cov nitrification- txoj kev denitrification tsis tau ua haujlwm.
2.3 Cov txheej txheem tseem ceeb
Tom qab ua tib zoo tshuaj xyuas ntawm qhov xwm txheej tshwj xeeb ntawm lub nroog Xichou lub nroog cov chaw kho dej khib nyiab, kev txhim kho thiab kho dua tshiab yuav tsum ua kom tiav hauv qhov chaw cog. Qhov chaw nyob hauv thaj tsam ntawm cov nroj tsuag muaj tsawg heev. Thaum txiav txim siab txog cov txheej txheem kho dej khib nyiab, nws yuav tsum ua tib zoo xav txog qhov chaw nyob thiab ua kom tsim nyog siv cov txheej txheem biochemical tank uas twb muaj lawm. Tom qab kev tshawb fawb dav dav, siv A2/O- cov txheej txheem MBBR (hu ua MBBR txheej txheem) tau hais daws cov teeb meem kev siv av thiab kev ua haujlwm zoo. Txoj hauv kev no tau pab txhawb peb - qhov nthuav dav ntawm lub peev xwm biochemical tank thiab ua kom muaj kev tsim kho ntawm anoxic thiab anaerobic tanks. Cov txheej txheem MBBR muab cov activated sludge nrog biofilm. Nws cov txiaj ntsig tau tshwm sim hauv nws cov hneev taw me me, cov saw hlau ntev ntev, muaj peev xwm ua tiav cov qauv dej zoo tshaj plaws, thiab kev ua haujlwm ruaj khov. Txoj kev biofilm rau kev tshem tawm nitrogen kuj tseem qhia tau zoo thaum lub caij ntuj sov qis. MBBR txheej txheem ntws tau qhia hauvDaim duab 1.
2.4 Qhov zoo ntawm MBBR txheej txheem
Sib piv cov txheej txheem MBBR, kho- cov txheej txheem biofilm media, thiab cov txheej txheem sludge, cov txheej txheem MBBR sawv tawm nrog cov txiaj ntsig zoo tshaj plaws, tshwj xeeb tshaj yog: ① Cov nqa khoom tshem tawm feem ntau yog ua los ntawm cov ntaub ntawv hloov kho xws li PP thiab PE, muab cov khoom zoo. Raws li cov cab kuj raug tshem tawm yooj yim pib thiab khiav lag luam, teeb meem xws li clumping thiab clogging tsis tshua muaj tshwm sim. Yog li ntawd, thaum siv rau lub aeration system thiab effluent li ntawm cov dej khib nyiab kho system, lawv depreciation tus nqi thiab hloov zaus yog tsawg heev. ② Cov txheej txheem MBBR muaj peev xwm tshem tawm nitrogen muaj zog. Aerobic, anoxic, thiab anaerobic ib puag ncig tuaj yeem sib koom ua ke ntawm cov cab kuj raug tshem tawm, tso cai rau ob qho tib si nitrification thiab denitrification cov tshuaj tiv thaiv kom tiav hauv ib lub reactor. Nitrifying kab mob tuaj yeem loj hlob sai ntawm biofilm tsim rau ntawm cov cab cab uas raug tshem tawm, ua tiav cov nitrification zoo. ③ Cov txheej txheem MBBR muaj kev ua siab ntev rau kev poob siab, ua kom muaj kev ruaj khov thiab ua haujlwm rau cov tshuaj lom. ④ Los ntawm kev siv cov txheej txheem MBBR, kev txhim kho tsim nyog thiab kev kho dua tshiab ntawm cov cuab yeej kho tshiab tuaj yeem siv tau, yuav luag tsis muaj kev hloov pauv rau kev siv av, yog li txuag chaw. ⑤ Kev kho cov dej khib nyiab ib txwm xav tau ntxiv cov cab kuj txhawb nqa hauv lub tank aeration, thaum cov txheej txheem MBBR tshem tawm cov kauj ruam no, yog li txo qhov nyuaj ntawm kev tswj cov khoom siv aeration thiab tswj cov nqa khoom.
3 Biochemical Tank Renovation Plan
3.1 Kev tsim kho tshiab Anaerobic thiab Anoxic Tank
After demolishing the buildings on the west side of the plant's biochemical tank area, new anoxic and anaerobic tanks were constructed on the cleared land. The anoxic zone was modified from the initial section of the existing biochemical tank. Active construction of the anoxic and anaerobic tanks was carried out. Their plan dimensions and effective volume must meet relevant usage requirements, and the hydraulic retention time was scientifically planned to enable them to play an important role. During the construction of the anoxic tank, the minimum temperature was controlled to >12 degree, thiab kev tswj xyuas cov ntsuas xws li cov dej cawv sib xyaw kom tshem tawm cov khib nyiab concentration, denitrification nitrate concentration, thiab denitrification tus nqi tau ua zoo. Cov pa roj carbon tsis txaus yuav tshwm sim thaum lub caij ntuj no; qhov tsim nyog ntawm cov pa roj carbon ntau tuaj yeem ntxiv los txhim kho denitrification efficiency. Lub tank tshiab tsim anoxic yog nruab nrog tag nrho ntawm 16 units ntawm 5 kW ntsug turbine mixers; biochemical tank uas twb muaj lawm anoxic cheeb tsam yog nruab nrog ib tug tag nrho ntawm 8 teev ntawm 5 kW ntsug propellers; anaerobic tank yog nruab nrog tag nrho ntawm 6 teeb ntawm 6.5 kW submersible mixers.
Sib piv qhov nyuaj coefficients ntawm phosphorus tshem tawm thiab nitrogen tshem tawm cov hauj lwm, kev tshem tawm nitrogen yog pom tau tias nyuaj dua. Feem ntau, txaus siab phosphorus tshem tawm cov teebmeem tuaj yeem tau txais los ntawm kev tshem tawm cov tshuaj phosphorus. Txhawm rau txhim kho cov txiaj ntsig kev tshem tawm nitrogen, thaum qhov kub thiab txias tsis muaj zog tag nrho cov nitrogen siab, cov sludge tuaj yeem rov ua dua mus rau ntu anaerobic kom ntseeg tau lub sijhawm khaws cia ntev dua hauv ntu anoxic.
3.2 Renovation ntawm Existing Biochemical Tanks
Tom qab kev kho dua tshiab, lub tank biochemical uas twb muaj lawm tau muab faib ua plaub ntu: Ib phab ntsa faib ntxiv ntawm thawj thiab plaub ntu. Cov cheeb tsam ua ntej thiab tom qab faib phab ntsa hauv ob ntu no yog thaj chaw anoxic thiab thaj chaw thauj khoom (MBBR cheeb tsam), thiab thaj chaw MBBR thiab thaj chaw degassing, feem. Qhov thib ob thiab thib peb yog ob qho chaw MBBR. Ntxiv cov phab ntsa faib rau hauv ntu plaub tuaj yeem tswj tau cov pa oxygen concentration ntawm cov khoom siv rov ua dua tshiab hauv qhov tsim nyog. Tsis tas li ntawd, cov cuab yeej xws li cov ntxaij vab tshaus thiab perforated yeeb nkab aerators tau teeb tsa hauv thaj chaw MBRR txhawm rau txhim kho kev ua haujlwm ntawm lub tank biochemical. Tom qab kev kho dua tshiab ntawm biochemical tank aerobic cheeb tsam tiav, tag nrho cov khoom siv tau zoo ntawm thaj chaw degassing thiab MBBR cheeb tsam ncav cuag 38,000 m³. Lub cheeb tsam degassing yog nruab nrog tag nrho ntawm 12 units ntawm 18.5 kW axial ntws twj, nrog 4 raws li standby; ntshiab HDPE tshem tawm cov cab kuj yog siv.
3.3 Renovation ntawm Blower Room thiab Aeration System
Muaj 4 lub tshuab tshuab hauv chav tshuab tshuab: 3 yog cov tshuab qub qub uas muaj qhov nkag nkag ntawm 480 m³ / min, thiab ib qho yog lub tshuab tshuab tshiab. Dej txias yog lub ntsiab cua txias rau cov qub blowers, nrog lub zog ntawm 830 kW txhua; cua txias yog txoj hauv kev tseem ceeb rau lub tshuab cua tshiab, nrog lub zog ntawm 670 kW. Muab piv rau kev ua haujlwm ntawm cov tshuab qub qub thiab cov tshuab tshiab tshiab, lub tshuab tshuab tshiab ua haujlwm zoo dua thiab ua tau zoo. Cov tshuab qub qub tsis yog tsuas yog muaj kev ua haujlwm qis xwb tab sis kuj yuav tsum tau saib xyuas thiab kho cov nqi kim.
Thaum tsim lub ntim aeration rau thaj chaw aerobic, nws yuav tsum ua raws li qhov xav tau ntau tshaj plaws ntawm cov pa oxygen hauv thaj chaw aerobic, nrog rau qhov kawg xaiv tus nqi ntawm 720 m³ / min. Kev teeb tsa ntawm perforated aeration kav yuav tsum yog raws li cov huab cua ntim ntawm 4 blowers. Kev ua haujlwm ntawm kev hloov cov tshuab qub qub yuav tsum tau ua kom zoo. Kev yuav 3 lub tshuab tshiab tshiab los hloov cov qub qub yog qhov zoo rau kev txo cov ntim aeration. Thaum hloov cov kav dej aeration, tsuas yog cov kav dej qub aeration hauv lub tank aerobic hloov.
3.4 Sludge Treatment System
Lub ntsiab sludge kho cov cuab yeej siv nyob rau hauv lub nroog Xichou lub zos dej khib nyiab kho nroj tsuag yog ib tug sludge thickening thiab dewatering lim xovxwm. Kev txheeb xyuas cov txheej txheem sludge dewatering thiab thickening, integrating sludge thickening thiab dewatering kev khiav dej num tuaj yeem txo cov nqi peev thiab txo qhov ntau npaum ntawm -polymer flocculants. Txhawm rau kom tsis txhob muaj kev puas tsuaj ib puag ncig los ntawm kev kho sludge, txhua yam sludge thickening thiab dewatering tshuab raug xaiv kom tswj tau zoo ib puag ncig thiab atmospheric pollution.
3.5 Deodorization System
Muaj ntau txoj hauv kev los kho cov ntxhiab tsw, feem ntau siv xws li kev lom neeg, tshuaj lom neeg, thiab kev siv lub cev. Cov kev kho mob sib txawv muaj qhov sib txawv tseem ceeb hauv lawv cov txheej txheem deodorization, daim ntawv thov, thiab hom kev siv. Tom qab kev txheeb xyuas qhov xwm txheej tshwj xeeb ntawm txoj haujlwm no thiab txiav txim siab qhov zoo thiab qhov tsis zoo ntawm cov cuab yeej deodorization sib txawv, cov txheej txheem ion deodorization tau raug xaiv thaum kawg los ua cov haujlwm cuam tshuam.
3.6 Cov ntsiab lus tseem ceeb ntawm kev kho dua tshiab
3.6.1 Kev xaiv tus neeg nqa khoom
Thaum xaiv cov cab kuj raug tshem tawm, nws yuav tsum tau ua kom ntseeg tau tias cov khoom tsim tau muaj kev tiv thaiv corrosion txaus thiab tag nrho cov kev ua haujlwm ntawm qhov chaw ua tau raws li cov qauv effluent, yog li lav cov biomass. Tib lub sijhawm, kev pabcuam lub neej, hnav tsis kam, thiab lub zog ntawm cov neeg nqa khoom raug tshem tawm yuav tsum ua tau raws li cov qauv, nrog rau kev pabcuam lub neej nyob rau ntau tshaj 15 xyoo.
3.6.2 Carrier Accumulation
Raws li cov dej ntws, cov cab kuj hloov txoj hauj lwm, ua rau muaj coob tus neeg nqa khoom mus rau hauv pem hauv ntej ntawm kev cuam tshuam cov ntxaij vab tshaus. Tom qab qee lub sijhawm, cov ntxaij vab tshaus cuam tshuam tuaj yeem ua rau txhaws. Kev nce aeration yog siv los tshem tawm cov cab cab. Lub taub hau poob tshwm sim ntawm txhua qhov kev cuam tshuam screen. Ntau tus neeg nqa khoom sib sau ua ke nyob rau hauv lub siab ntawm cov dej theem sib txawv ntawm qhov screen. Raws li qhov sib txawv ntawm cov dej nce, tus nqi ntawm cov cab kuj nce ntxiv. Lub tshuab nqa khoom siv rov ua dua tshiab tau teeb tsa hauv thaj chaw thauj khoom. Tsav los ntawm lub tshuab nqa dav hlau, cov neeg nqa khoom thaum kawg ntawm thaj chaw thauj khoom xa rov qab mus rau pem hauv ntej kawg, tiv thaiv cov cab cab.
3.7 Kev Ntsuam Xyuas Tom Qab-Kev Txhim Kho Kev Ua Haujlwm Zoo
Tag nrho cov peev nyiaj rau qhov project no yog 219.91 lab yuan. Tus nqi nruab nrab ntawm kev khiav hauj lwm yog 0.4 yuan / m³, thiab qhov nruab nrab nqi tag nrho yog 0.5 yuan / m³. Tom qab qhov kev txhim kho kho dua tshiab tau ua tiav thiab muab tso rau hauv kev ua haujlwm, nws cov dej ntws zoo txaus siab heev, kev ua haujlwm tau zoo, thiab cov qauv dej tsis zoo tuaj yeem ua tau raws li qhov yuav tsum tau ua.
4 Kev xaus
Thaum lub sij hawm tsim kho ntawm qhov kev txhim kho thiab kho dua tshiab, cov qauv uas twb muaj lawm tau siv tau zoo. Los ntawm kev ua haujlwm ntawm MBBR thev naus laus zis, kev txhim kho kev tsim kho ua haujlwm tau ua tiav cov txiaj ntsig zoo yam tsis tau nce cov hneev taw, txhim kho cov nitrogen thiab phosphorus tshem tawm lub peev xwm ntawm cov dej khib nyiab thiab kev ua kom cov pa phem tshem tawm. MBBR thev naus laus zis tau zoo heev, tsis yog tsuas yog qhov zoo ntawm cov txheej txheem kev kho dej khib nyiab nkaus xwb tab sis kuj siv tau cov peev txheej kho mob siab ntawm nws cov neeg nqa khoom tshwj xeeb, txhim kho cov pa phem purification efficiency.
Raws li kev txheeb xyuas thiab kev ua qauv qhia, txhawm rau ua kom ntseeg tau tias muaj txiaj ntsig ntawm txoj kev npaj, nws raug nquahu kom siv MBBR txheej txheem txheej txheem. Los ntawm kev ua haujlwm hauv - qhov kev kho dua tshiab ntawm cov kab mob lom neeg qub, ntxiv cov neeg nqa khoom mus rau thaj chaw aerobic kom nws lub peev xwm thauj khoom kom ntseeg tau tias kev kho nitrogen tau raws li cov qauv. Tom qab siv cov siab - ntom ntom ntim tso tsheb hlau luam + cov ntaub ntawv xov xwm lim dej los tswj SS thiab TP tuaj yeem lav cov dej ntws ruaj khov raws li qib 1A tus qauv. Cov txheej txheem MBBR, nrog rau ntau cov txheej txheem sib xyaw ua ke uas suav nrog MBBR rau hauv cov tshuab ua kom cov sludge, ua haujlwm ruaj khov, yooj yim rau kev khiav lag luam thiab kho, muaj kev kam rau siab rau cov kev hloov pauv ntawm cov khoom muaj txiaj ntsig zoo thiab muaj nuj nqis, muab cov txiaj ntsig zoo nitrogen thiab phosphorus tshem tawm, thiab sawv cev rau kev lag luam, txuag dej, thiab ruaj khov txoj kev kho dej khib nyiab. Raws li lub teb chaws thiab hauv zos cov kev cai rau cov dej tsis zoo los ntawm cov nroj tsuag kho cov dej khib nyiab nce, cov txheej txheem no yog ib qho kev daws teeb meem zoo rau cov haujlwm uas ntsib cov teeb meem xws li kev tsim kho thaum ntxov nrog cov txheej txheem tsis tuaj yeem ua tau raws li cov kev xav tau tshiab, txwv tsis pub muaj av, cov nqi av siab, thiab nyiaj txiag nyuaj. Nws yuav tsum tau siv dav dua hauv kev kho dua tshiab thiab kho dua tshiab hauv nroog lossis chaw kho dej khib nyiab.
Tsis tas li ntawd, thaum lub sijhawm kho dua tshiab no, cov phiaj xwm kev tswj hwm txoj hauv kev tau coj los ua raws li cov xwm txheej tiag tiag thaum kho cov khoom siv biochemical, suav nrog kev ntxiv dag zog rau kev tswj hwm cov ntsuas xws li denitrification nitrate concentration thiab denitrification tus nqi. Cov txheej txheem kho dua tshiab tau tsom mus rau kev txhim kho kev xaiv cov cab kuj thiab kev tswj xyuas cov khoom. Los ntawm kev sib koom ua ke kev kho dua tshiab rau chav tshuab cua tshuab thiab aeration system, sludge kho system, thiab deodorization system, kev kho dav dav ntawm cov chaw kho dej khib nyiab tau txhim kho.