Kev Tshawb Fawb Sib Piv ntawm Nitrogen thiab Phosphorus Tshem Tawm Kev Ua Haujlwm Ntawm Bardenpho thiab AAO Cov Txheej Txheem
1 Project Overview and Process Flow
1.1 Project Overview
Lub Xi'an No.5 Reclaimed Water Plant (yav tas los "No.5 Wastewater Treatment Plant," tom qab ntawd hu ua "WuWu") muaj tag nrho cov qauv tsim ntawm 400,000 m³ / d, npog thaj tsam ntawm 387.57 mu (kwv yees 258,380 m²). Nws ua haujlwm tag nrho thaj tsam ntawm 5,330 hectares thiab cov pejxeem ntawm kwv yees li 900,000. Cov nroj tsuag tuaj yeem kho cov dej phwj tuaj hauv tsev thiab cov dej khib nyiab siv los ntawm cov txheej txheem AAO ib txwm siv lossis tsib -theem Bardenpho txheej txheem. Cov txheej txheem dej khib nyiab tseem ceeb muaj xws li cov ntxaij lim dej, nqa cov twj tso kua mis, cov ntxaij vab tshaus zoo, cov khoom siv aerated grit chambers, thawj cov dej khib nyiab, cov tshuaj lom neeg lub tank, cov dej khib nyiab theem nrab, siab -cov twj tso kua mis ua tau zoo, V- hom lim, thiab tiv tauj cov tshuaj tua kab mob, nrog rau cov dej xau zaum kawg. Cov dej khib nyiab ua tau raws li Qib A tus qauv tau teev tseg hauv Table 1 ntawm "Shaanxi Province Yellow River Basin Comprehensive Wastewater Discharge Standard" (DB61/224-2018). (Ceeb Toom: Qhov txwv TN ua raws li qhov yuav tsum tau muaj ntawm 12 mg/L teev nyob rau hauv "Xi'an Cheeb Tsam Lub Nroog Cov Dej Ncua Kev Kho Dej Nroj Tsuag Reclamation Upgrade, Npog, thiab Deodorization Project Peb-Year Action Plan (2018-2020)" (Cov Ntaub Ntawv Hauv Nroog [2025}] Tsis muaj{{2018}). Cov qauv tsim muaj txiaj ntsig thiab cov dej tsis zoo yog qhia hauvTable 1.
1.2 Txheej txheem Flow
Flowcharts piv cov txheej txheem Bardenpho nrog cov txheej txheem AAO ib txwm muaj nyob hauvDaim duab 1 thiab 2.
2 Tsim Parameters
2.1 Tsim Nthuav Dej thiab Dej Zoo
2.2 Kev khiav hauj lwm Parameter
Cov tso tsheb hlau luam lom neeg koom nrog kev sib piv sib piv qhov sib npaug. Txhua lub tank yog muab faib ua 3 channel, nrog ib qho channel dimension L × W × H=86 m × 15 m × 9 m. Qhov nruab nrab MLSS concentration nyob rau hauv cov roj ntsha tso tsheb hlau luam nyob ntawm 6,500 ~ 7,000 mg / L. Lub sij hawm tuav hydraulic (HRT) rau cov txheej txheem AAO cov qauv yog: Anaerobic Zone 1.983 h, Anoxic Zone 5.534 h, Aerobic Zone 9.029 h, tag nrho 16.546 h. HRTs rau cov txheej txheem Bardenpho yog: Anaerobic Zone 1.983 h, Thawj Anoxic Zone 4.643 h, Thawj Aerobic Zone 7.163 h, Second Anoxic Zone 1.973 h, Thib Ob Aerobic Zone 0.822 h, tag nrho 16.584 h.
3 Txoj Haujlwm Keeb Kwm, Kev Tshawb Fawb Lub Hom Phiaj, thiab Cov Txheej Txheem
3.1 Project Background thiab Research Objective
Cov txheej txheem tshuaj lom neeg tseem ceeb ntawm WuWu yog cov txheej txheem AAO cov txheej txheem thiab cov txheej txheem Bardenpho. Cov txheej txheem AAO cov txheej txheem yog ib txoj kev kho mob lom neeg hauv cov chaw kho dej khib nyiab. Nrog rau kev txhim kho txuas ntxiv ntawm Tuam Tshoj cov qauv dej khib nyiab pov tseg, cov txheej txheem Bardenpho, muab los ntawm cov txheej txheem AAO cov txheej txheem thiab paub txog nws cov kev tshem tawm nitrogen ntau dua, tau txais kev pom zoo los ntawm cov chaw kho dej khib nyiab hauv tsev. Txhawm rau pab txhawb kev xaiv cov txheej txheem zoo dua, WuWu tau ua qhov kev sib piv ntawm cov txheej txheem AAO thiab Bardenpho cov txheej txheem los ntawm kev xav txog kev tshem tawm nitrogen thiab phosphorus. Qhov no muab lub hauv paus rau kev txhim kho ntawm lwm lub nroog hauv tsev kho dej khib nyiab thiab tsim cov haujlwm tshiab.
3.2 Kev Tshawb Fawb Txog Kev Tshawb Fawb
Txhua lub tank lom ntawm WuWu muaj peev xwm kho txhua hnub ntawm 50,000 m³ / d. Rau qhov kev sim sib piv no, A1 thiab B1 series biological tanks raug xaiv. A1 series siv cov txheej txheem Bardenpho, nrog rau nws cov kab ke lom neeg ua ntu zus faib ua: Anaerobic Zone, First Anoxic Zone, First Aerobic Zone, Second Anoxic Zone, thiab Second Aerobic Zone. B1 series siv cov txheej txheem AAO ib txwm ua, nrog rau nws cov kab ke lom neeg tau faib ua ntu zus mus rau: Anaerobic Zone, Anoxic Zone, thiab Aerobic Zone. Thaum lub sijhawm sim, ob qho tib si ua haujlwm nyob rau hauv cov xwm txheej zoo ib yam, nrog cov ntsiab lus piv txwv faib raws cov txheej txheem ntws raws li qhov xav tau.
Txoj kev ntsuas pa phem: TP raug ntsuas siv Ammonium Molybdate Spectrophotometric Method; TN siv Alkaline Potassium Persulfate Digestion UV Spectrophotometric Method; NH₃-N siv Nessler's Reagent Spectrophotometric Method; COD siv Potassium Dichromate Spectrophotometric Method.
4 Kev Sib Tw Ua Haujlwm thiab Tam Sim No
Cov txheej txheem AAO cov txheej txheem kuj yog qhov txawv ntawm AO activated sludge txheej txheem. Nws TN tshem tawm tag nrho yog nyob ntawm kev rov ua dua tshiab. Cov qauv effluent siab dua thiab ntau dua qhov yuav tsum tau tshem tawm yuav tsum muaj cov dej ntws loj dua, nrog rau kev siv zog thiab tshuaj lom neeg ntxiv. Rau Qib A cov qauv, cov txheej txheem AAO ib txwm siv tau. Txawm li cas los xij, rau cov qauv TN nruj dua, cov txheej txheem cov txheej txheem yog kom meej meej tsis haum.
Cov txheej txheem Bardenpho yog ib qho txheej txheem tsib- theem. Los ntawm kev ntxiv ib qho kev tshaj tawm - thaj chaw denitrification tom qab cov txheej txheem AAO cov lus pom zoo, nws rhuav tshem cov kev txwv ntawm TN tshem tawm yog nyob ntawm qhov sib npaug ntawm qhov rov ua haujlwm, yog li txhim kho kev tshem tawm nitrogen. Raws li cov chaw kho dej khib nyiab ntsib cov qauv TN tso tawm nruj zuj zus, cov txheej txheem Bardenpho qhia tau zoo heev.
5 Kev Tshawb Fawb Txog Kev Tshawb Fawb thiab Kev Sib Tham
5.1 NH₃-N tshem tawm
NH₃-N qib ntawm qhov muaj txiaj ntsig ntawm thaj chaw anaerobic thiab cov dej ntws tawm ntawm cov tso tsheb hlau luam rau A1 thiab B1 tau saib xyuas ntau zaus dhau 15 hnub. Cov txiaj ntsig tau qhia hauvDaim duab 3. Qhov nruab nrab NH₃-N tshem tawm cov txheej txheem Bardenpho yog 12.7 mg / L, thaum rau cov txheej txheem AAO ib txwm yog 11.68 mg / L. Cov txiaj ntsig tau qhia tias nyob rau hauv tib lub caij nyoog, lub sijhawm, kev faib tawm tsis sib xws, thiab nrog cov pa roj carbon ntxiv hauv thaj tsam ua ntej - anoxic, Bardenpho txheej txheem ua tiav NH₃-N tshem tawm zoo dua li cov txheej txheem AAO.
5.2 TN Tshem Tawm
TN theem ntawm qhov muaj txiaj ntsig ntawm thaj chaw anaerobic thiab cov dej ntws tawm ntawm cov tso tsheb hlau luam rau A1 thiab B1 tau saib xyuas dua li 10 hnub. Cov txiaj ntsig tau qhia hauvDaim duab 4. Qhov nruab nrab TN tshem tawm rau Bardenpho txheej txheem yog 6.23 mg / L, thaum rau cov txheej txheem AAO ib txwm yog 2.65 mg / L. Cov txiaj ntsig tau qhia tias nyob rau hauv tib lub sijhawm, cov txheej txheem Bardenpho tau ua tiav tag nrho TN tshem tawm zoo dua li cov txheej txheem AAO.
5.3 TP Tshem Tawm
TP theem ntawm qhov muaj txiaj ntsig ntawm thaj chaw anaerobic thiab cov dej ntws ntawm cov tso tsheb hlau luam rau A1 thiab B1 tau saib xyuas ntau zaus dhau 22 hnub. Cov txiaj ntsig tau qhia hauvDaim duab 5. Qhov nruab nrab TP tshem tawm rau Bardenpho txheej txheem yog 0.561 mg / L, thaum rau cov txheej txheem AAO ib txwm yog 0.449 mg / L. Cov txiaj ntsig tau qhia tias nyob rau hauv tib lub sijhawm, cov txheej txheem Bardenpho tau ua tiav tag nrho TP tshem tawm zoo dua li cov txheej txheem AAO.
5.4 COD Tshem Tawm
COD qib ntawm qhov muaj txiaj ntsig ntawm thaj chaw anaerobic thiab cov dej ntws tawm ntawm cov tso tsheb hlau luam rau A1 thiab B1 tau saib xyuas ntau zaus dhau 9 hnub. Cov txiaj ntsig tau qhia hauvDaim duab 6. Qhov nruab nrab COD noj rau cov txheej txheem Bardenpho yog 13 mg / L, thaum rau cov txheej txheem AAO nws yog 19 mg / L. Cov txiaj ntsig qhia tau hais tias nyob rau hauv tib lub sijhawm, cov txheej txheem AAO cov txheej txheem muaj qhov xav tau COD ntau dua li cov txheej txheem Bardenpho.
6 Xaus thiab Outlook
6.1 Xaus
Raws li tib lub caij nyoog ua haujlwm, cov txheej txheem Bardenpho tau qhia tag nrho cov qauv ntawm kev tshem tawm zoo tshaj plaws rau TN, TP, thiab NH₃-N hauv cov dej khib nyiab piv rau cov txheej txheem AAO.
Tam sim no, txhua xyoo phosphorus tshem tawm tus neeg sawv cev siv rau kev kho cov dej khib nyiab nrog cov txheej txheem AAO ntawm WuWu yog kwv yees li 2,961 tons; rau cov txheej txheem Bardenpho, nws yog kwv yees li 2,000 tons. Qhov no txhais tau hais tias kev txuag nyiaj txhua xyoo ntawm kwv yees li 450,000 RMB, ua kom pom cov txiaj ntsig tseem ceeb ntawm kev lag luam.
Kev ua haujlwm ntawm Bardenpho txheej txheem yuav ua tau raws li qhov yuav tsum tau ua ntawm Tuam Tshoj txoj kev nruj nruj ntawm cov dej khib nyiab thiab txo cov pa phem hauv cov dej ntws hauv qab dej Ba River. Qhov no yuav ua rau muaj kev txhim kho tseem ceeb hauv cov dej zoo, ob qho tib si perceptually thiab nyob rau hauv cov nqe lus ntawm txo cov pa phem ntau ntau, maj mam rov qab ua haujlwm ib puag ncig. Nws tuav qhov tseem ceeb tshwj xeeb rau kev tiv thaiv ib puag ncig ecological ntawm cov dej hauv qab dej. Hauv paus, kev kho dej khib nyiab tswj cov pa phem ntawm cov dej khib nyiab hauv nroog rau cov dej hauv av. Yog li ntawd, nws ua lub luag haujlwm tiv thaiv rau cov dej hauv nroog thiab cov dej ntws hauv qab, maj mam rov ua kom muaj kuab paug ib puag ncig. Qhov no yuav txhim kho qhov chaw nyob zoo rau cov neeg nyob hauv nroog thiab qhov chaw tsim khoom rau Kev Lag Luam thiab Kev Lag Luam, txhim kho lub nroog cov duab sab nraud, thiab pab txhawb kev noj qab haus huv thiab kev loj hlob ntawm kev lag luam thiab zej zog.