Txhim kho thiab ua tau zoo tau txais txiaj ntsig ntawm Fine Bubble Diffuser Membranes hauv Cov Chaw Kho Dej Hauv Nroog
Lub aeration system, ib qho tseem ceeb ntawm cov txheej txheem activated sludge wastewater kho, cuam tshuam ncaj qha rau kev kho mob thiab cov nqi ua haujlwm. Kev txheeb xyuas qhia tau tias aeration tuaj yeem suav txog 40% mus rau 60% ntawm WWTP qhov kev siv hluav taws xob tag nrho. Lub diffuser daim nyias nyias, qhov nruab nrab tseem ceeb rau kev hloov pauv cov pa oxygen, txiav txim siab qhov kev hloov pauv ntawm cov pa oxygen (OTE) thiab qib kev siv hluav taws xob. Nyob rau tib lub sijhawm, daim nyias nyias feem ntau raug kev txom nyem los ntawm kev laus, txhaws, thiab kev puas tsuaj, ua rau txo OTE thiab siv zog ntau ntxiv.
Tuam Tshoj muaj tshaj 4,000 lub nroog WWTPs nrog kev kho txhua xyoo muaj peev xwm tshaj 60 billion m³. Kev siv hluav taws xob txhua xyoo ntawm cov tshuab aeration tshaj 100 billion kWh. Yog li ntawd, optimizing aeration systems thiab txhim kho OTE yog qhov tseem ceeb heev rau kev ua tiav "Dual Carbon" cov hom phiaj. Txawm li cas los xij, cov kev tshawb fawb empirical ntawm diffuser membrane hloov hauv WWTPs hauv nroog yog qhov tsawg, tshwj xeeb tshaj yog hais txog kev ntsuas kev siv hluav taws xob thiab kev kho mob.
1. Kev tshawb fawb ntawm Aeration System Optimization
Kev tshawb fawb thoob ntiaj teb tsom rau kev txhim kho cov khoom siv membrane thiab aeration method innovation. Piv txwv li, lub teb chaws Yelemees's Supratec tau tsim EPDM daim nyias nyias nrog kev hloov pauv cov pa oxygen ntawm 0.33, thiab US EPA cov kev tshawb fawb qhia tias micro- npuas aeration txuag ntau dua 30% lub zog piv rau cov txheej txheem ib txwm muaj. Cov kws tshawb fawb hauv tsev zoo li Hu Peng pom tias kev ua kom zoo tuaj yeem txo cov nroj tsuag siv zog los ntawm 15% -25%.
Txawm li cas los xij, cov kev tshawb fawb uas twb muaj lawm muaj qhov tsis txaus: feem ntau ntawm cov kev tshawb fawb hauv lab dhau qhov tiag- kis mob hauv ntiaj teb, tsom rau qhov luv luv - lub sij hawm cuam tshuam ntev - lub sij hawm ruaj khov, thiab kev soj ntsuam ntawm ib qho kev ntsuas tshaj cov txiaj ntsig zoo. Txoj kev tshawb no, dhau los ntawm kev soj ntsuam ntev ntev, ntsuas qhov cuam tshuam ntawm cov membrane hloov ntawm kev kho kom zoo thiab kev siv hluav taws xob, hais txog qhov sib txawv ntawm kev tshawb fawb.
2. Kev Tshawb Fawb Cov Ntsiab Lus thiab Txheej Txheem
Txoj kev tshawb no tau siv qhov kev sib piv ntawm cov ntaub ntawv ua haujlwm ua ntej thiab tom qab hloov daim nyias nyias (Lub Rau Hli 2020 - Lub Peb Hlis 2022) ntawm WWTP hauv Dongguan, Guangdong. Cov kev tshawb fawb tseem ceeb suav nrog: kev hloov pauv hauv kev tshem tawm cov pa phem, kev siv lub zog aeration system, OTE txhim kho mechanisms, thiab techno- kev tshuaj xyuas kev lag luam. Cov txheej txheem koom nrog kev saib xyuas thaj chaw thiab kev soj ntsuam kuaj.
2.1 Cov Ntsiab Lus Tseem Ceeb
Cov ntaub ntawv WWTP muaj peev xwm tsim tau ntawm 20,000 m³ / d, siv cov txheej txheem A² / O rau cov dej phwj hauv nroog, pab kwv yees li 150,000 tus neeg, thiab muaj qhov tseeb txhua hnub ntawm 18,000-24,000 m³. Thawj cov roj hmab zoo npuas diffusers tau ua haujlwm rau 8 xyoo, qhia txog kev laus tseem ceeb.
2.2 Txhim kho Txoj Kev Npaj Tsim
2.2.1 Oxygen Demand Calculation
Based on water quality/quantity, the aerobic zone's daily oxygen demand was >275 kg / h. Xav txog qhov chaw pabcuam, muaj peev xwm muab cov pa oxygen, thiab muaj peev xwm txhaws, qhov xav tau huab cua tau suav tias yog 2,400–4,800 m³ / h (hnyav 1,200 m³ / h, Cua- rau - Dej piv 2–4). Qhov no sib npaug rau 480 meters ntawm diffuser tubing (cua pa 5-10 m³ / h ib 'meter'), nrog rau thaj tsam kev pabcuam hauv qab 2.5 m² ib 'meter', tso cai rau cov pa oxygen ntau tshaj 380 kg / h.
2.2.2 Kev xaiv Membrane
Raws li kev sib piv kev ua haujlwm (Table 1), xav txog OTE, airflow ntau yam, thiab tus nqi, EPDM zoo npuas daim nyias nyias raug xaiv. Cov ntsiab lus tseem ceeb: OTE 0.33 (siab dua li qub), airflow 2–15 m³ / h, kev pab cuam lub neej 5–8 xyoo, thiab tus nqi- nqi tsev zoo.
2.2.3 Kev Xaiv Chaw Tsim Khoom
Tom qab sab laj cov neeg muag khoom hauv tsev thiab xav txog kev paub hauv zos, paddle- hom EPDM diffusers tau xaiv rau lawv cov txiaj ntsig zoo hauv cov pa oxygen, kev teeb tsa, thiab tus nqi. Tag nrho ntawm 484 meters tau teeb tsa thoob plaws ob lub tank lom. Technical parameters ntawm txawv qauv yog qhia nyob rau hauvRooj 2.
2.2.4 Kev hloov pauv hloov
Kev hloov pauv thaum Lub Rau Hli 2021 siv sijhawm 7 hnub, suav nrog 484 meters ntawm paddle-hom diffusers. Cov nroj tsuag tswj kev ua haujlwm tsis tu ncua los ntawm kev khiav ntawm kev txo qis ntawm ib sab. Cov membranes tshiab, tsim rau 5 m³ / h, ua haujlwm ntawm 4-8 m³ / h.
2.3 Kev Sau thiab Kev Ntsuam Xyuas
22 lub hlis ntawm kev ua haujlwm cov ntaub ntawv tau sau ua ntej thiab tom qab hloov pauv thoob plaub pawg: dej zoo (kev ua haujlwm zoo / dej ntws COD, NH₃-N), kev ua haujlwm tsis zoo (tag nrho cov huab cua, siab, DO), kev siv hluav taws xob (kev siv hluav taws xob aeration, aeration kWh/m³), thiab kev ua haujlwm zoo (OTE, Huab cua{2}to {2}).
3. Kev hloov pauv hauv kev tshem tawm cov pa phem
3.1 COD Tshem Tawm
Tom qab- hloov pauv, COD tshem tawm tau zoo dua qub. Effluent COD txo los ntawm 14.2 mg / L rau 12.4 mg / L, thiab tshem tawm tus nqi nce los ntawm 93.5% mus rau 96.0%. Cov txheej txheem tshiab kuj qhia tau tias muaj kev ruaj ntseg zoo dua txawm hais tias muaj kev hloov pauv COD (117-249 mg / L) (Daim duab 1).
3.2 NH₃-N tshem tawm
Kev txhim kho tau tshaj tawm rau NH₃-N. Nrog rau cov qib muaj zog ruaj khov, cov dej ntws NH₃-N txo qis los ntawm qhov nruab nrab ntawm 2.3 mg / L rau 0.85 mg / L, thiab tus nqi tshem tawm mus txog 94.1% (Daim duab 1). Qhov no yog vim muaj qhov sib txawv ntawm aeration faib, txhawb kev loj hlob nitrifier thiab kev ua haujlwm, ua kom ruaj khov NH₃-N ua raws.
4. Aeration System Kev Siv Hluav Taws Xob Cov yam ntxwv
4.1 Huab cua- rau - Dej piv
Huab cua-rau- Dej piv tau txo qis ntawm 3.4 mus rau qis dua 2.0, thaum lub tank aerobic DO tseem nyob ruaj khov ntawm 0.5–1 mg / L (Daim duab 2), qhia ntau dua efficiency thiab stability.
4.2 Aeration Zog ib cubic Meter ntawm dej
Aeration zog siv tau txo los ntawm 0.073 kWh / m³ mus rau 0.052 kWh / m³, txo ntawm 28.3%. Kev txuag hluav taws xob tau ruaj khov nyob rau lub hlis (Daim duab 3), qhia kev ntseeg tau zoo ib yam.
4.3 Kev siv hluav taws xob rau ib chav ntawm cov pa phem tshem tawm
Qhov kev ntsuas no txo qis ntawm 0.32 kWh / kg txog 0.24 kWh / kg, txo 25% (Daim duab 4). Qhov no qhia tau hais tias cov membranes tshiab tsis tsuas yog txo qis kev siv zog nkaus xwb tab sis kuj txhim kho kev siv hluav taws xob zoo rau kev tshem tawm cov pa phem.
5. Mechanisms rau txhim kho Oxygen Siv Efficiency
5.1 Hloov hauv Oxygen Transfer Efficiency
OTE nce los ntawm 15.10% mus rau 24.75%, kev txhim kho 63.9% (Daim duab 5). Qhov no yog vim qhov ua kom zoo dua micro- pore qauv thiab ntau cov npuas sib txawv ntawm cov membranes tshiab, txhim kho cov pa oxygen loj. Advanced nanotechnology tso cai finer, ntau uniformly faib pores, nce diffusion thiab solubility.
5.2 Kev ua kom zoo ntawm kev ua haujlwm tsis zoo
Raws li qhia hauvTable 3, tom qab- hloov pauv, tag nrho cov huab cua ntim tau txo los ntawm 18.4% thaum tswj DO ntawm 0.5–1 mg / L. Huab cua-rau- Dej piv tau txo los ntawm 3.4: 1 txog 2.0: 1, OTE nce 63.9%, thiab lub zog aeration ib m³ txo los ntawm 28.3%. Cov kev ua kom zoo tshaj plaws no tau txhim kho kev siv zog, kev ua haujlwm zoo, thiab dej zoo.
6. Techno-Kev tsom xam nyiaj txiag
6.1 Lub Sijhawm Them Nyiaj Rov Qab
Tag nrho cov peev yog 163,900 CNY (membranes, thauj, installation, commissioning). Raws li kev txuag hluav taws xob ntawm 0.021 kWh / m³, tus nqi hluav taws xob ntawm 0.7 CNY / kWh, thiab qhov nruab nrab txhua hnub ntws ntawm 24,000 m³, kev txuag hluav taws xob txhua xyoo yog 128,800 CNY. Lub sijhawm them rov qab yooj yim yog kwv yees li 15 lub hlis, qhia txog cov txiaj ntsig kev lag luam tseem ceeb.
6.2 Kev Pabcuam Ib puag ncig
Raws li kev kho txhua xyoo ntawm 8.76 lab m³, kev txuag hluav taws xob txhua xyoo yog 184,000 kWh, sib npaug txo qis CO₂ emissions los ntawm 184 tons. Txhim kho cov pa phem tshem tawm txhim kho ib puag ncig cov txiaj ntsig thiab ua kom muaj kev ruaj ntseg ntau dua kev ua raws, txo kev pheej hmoo ib puag ncig.
7. Cov lus xaus
Hloov nrog EPDM zoo npuas diffuser daim nyias nyias tau nce OTE mus rau 24.75% thiab txo qis aeration zog noj los ntawm 28.3%, ua kom pom zoo techno- kev lag luam kev lag luam. Cov txheej txheem tshiab tau nce COD thiab NH₃-N tshem tawm tus nqi mus rau 96.0% thiab 94.1%, raws li txoj cai, txhim kho qhov kev ua haujlwm zoo rau kev thauj khoom hloov pauv, thiab ua tiav lub sijhawm them rov qab yooj yim li ntawm 15 lub hlis. Txoj hauv kev no yog qhov tsim nyog rau lub zog-kev siv zog hauv nroog WWTPs nrhiav kev txhim kho kom zoo thiab ua haujlwm tau zoo, qhia txog tus nqi txhawb nqa tseem ceeb.