Cov cuab yeej siv aeration yog qhov tseem ceeb tshaj plaws ntawm cov khoom siv kho tshuab hauv oxidation ditch. Nws txiav txim siab txog kev kho mob, kev siv hluav taws xob, thiab kev ua haujlwm ruaj khov hauv ib qho mob stroke - thiab nws tseem yog qhov loj tshaj plaws ntawm cov nroj tsuag cov nqi hluav taws xob siv. Txawm li cas los xij, feem ntau cov pa oxidation ditch aerators ob txoj haujlwm uas yuav tsum muaj kev ywj pheej: hloov cov pa oxygen thiab thawb dej nyob ib ncig ntawm lub pas dej. Kab lus no piav qhia vim li cas microporous aeration - nrog rau kev siv cov pa oxygen ntawm7–25%thiab lub zog efficiency ntawm1.8-2.5 kg O₂/kWh- tau dhau los ua thev naus laus zis ntawm kev xaiv lub zog-cov neeg ua haujlwm hauv nroog tsis nco qab, thiab yog vim li cas 50,000 m³ / d Zhaoqing WWTP ua tiav Class 1A effluent ntawm xwb0.19 kWh/m³.
Plaub Txoj Haujlwm Ntawm Oxidation Ditch Aeration
Hauv qhov oxidation ditch, aeration cov cuab yeej ua tau plaub yam haujlwm: (1) muab cov pa oxygen rau cov cawv sib xyaw rau kev lom oxidation, (2) tsav cov dej ntws mus rau pem hauv ntej, (3) tswj kev ncig hauv qhov kwj dej, thiab (4) xyuas kom muaj kev sib xyaw ua ke ntawm oxygen, organic substrates, thiab cov kab mob kom nyob twj ywm rau hauv sluens sludge.
Cov khoom siv sib xyaw ua ke - kab rov tav ncej aerators ( txhuam aerators thiab disc aerators) thiab ntsug ncej nto aerators - sim ua tag nrho plaub txoj haujlwm nrog ib lub tshuab. Qhov kev sib txuas ntawd yog lub hauv paus ntawm kev ua haujlwm tsis sib haum xeeb: qhov ntws nrawm yuav tsum tau ua kom cov sludge los ntawm kev daws teeb meem (>0.3 m/s) feem ntau yog siab tshaj qhov kev siv aeration ntawm biology tiag tiag xav tau, tshwj xeeb tshaj yog thaum tsis muaj load. Qhov tshwm sim yog qhov ntev tshaj - aeration uas cuam tshuam cov cheeb tsam anoxic xav tau rau kev tshem tawm nitrogen thiab phosphorus. Microporous aeration sidesteps qhov kev tsis sib haum xeeb los ntawm kev sib cais cov pa oxygen los ntawm kev khiav propulsion nkaus.
Qhov Ntsuas Kev Ua Tau Zoo: EA Thiab EP
Oxygen Utilization Efficiency (EA)
EA sawv cev rau feem pua ntawm cov pa xa tawm los ntawm huab cua mus rau hauv cov cawv sib xyaw nrog rau tag nrho cov pa oxygen nkag. Kev tswj hwm kev sib raug zoo tsim nyog nkag siab vim lawv piav qhia tias vim li cas cov npuas zoo yeej:
Rau cov dej khib nyiab, ob qho tib si loj hloov coefficient (KL) thiab lub npuas nce nrawm (vb) yog cov haujlwm ntawm npuas taub (db). Lub sij hawm tsis muaj nuj nqisHRT·KL·h / (vb·db)ntes cov npuas loj ntawm cov pa oxygen hloov pauv - thiab cov npuas me ua rau EA siab dua. Cov laj thawj yog lub cev: cov npuas zoo muaj ntau qhov chaw loj dua - cheeb tsam - rau - ntim piv, thiab lawv nce qeeb dua, yog li txhua npuas siv sijhawm ntev dua hauv cov cawv sib xyaw thiab hloov pauv ntau dua ntawm nws cov pa ua ntej mus txog qhov chaw.
Ntau dua aerator submergence qhov tob (h) kuj nce EA, vim tias qhov tso tawm tob dua txhais tau tias txoj kev mus ncig ua npuas ntev dua. Txawm li cas los xij, tus nqi ntawm kev txhim kho ploj zuj zus nrog qhov tob ntxiv - muaj qhov cuam tshuam ntawm kev rov qab los. EA kuj muaj qhov theoretical siab tshaj plaws los ntawm qhov sib piv ntawm cov pa oxygen concentration rau saturation oxygen concentration hauv cov cawv sib xyaw; Thaum cov cawv mus txog qhov muaj oxygen saturation, tsis muaj cua ntxiv tuaj yeem thawb cov pa ntau ntxiv rau hauv.
Fais fab Efficiency (EP)
Lub zog efficiency, qhia nyob rau hauvkg O₂/kWh, ntsuas cov pa oxygen xa mus rau ib chav tsev ntawm hluav taws xob siv hluav taws xob. EP thiab EA tsis muaj kev ywj pheej - ob qho tib si yog kev ua haujlwm ntawm submergence qhov tob (h) thiab npuas taub (db). Ob qhov kev tshawb pom sawv tawm rau tus tsim engineers:
Ua ntej, rau ib qho kev ua npuas dej, EP pib nce nrog submergence qhov tob, ncav cuag qhov siab tshaj plaws, thiab tom qab ntawd ntog. Qhov zoo tshaj plaws h thiab dbua ke yuav tsum tau xaiv ua ke - ib tug tob tank yog tsis cia li zoo. Thib ob, rau qhov zoo - npuas tshuab,tob tank aeration yuav tsum tau zamYog hais tias nws thawb lub kaw lus mus rau qhov nqis los ntawm EP nkhaus, vim hais tias qhov ntawd yuav txo tau lub zog ua haujlwm txawm tias cov pa oxygen hloov pauv tau zoo dua.
Sib piv Kev Ntsuas Ntawm Cov Khoom Siv Aeration
Table 1 piv cov cuab yeej aeration feem ntau ntsia hauv oxidation ditches. Nco ntsoov tias txhua yam kev ua haujlwm aeration tau qhia tias muaj peev xwm oxygenation (kg O₂ / h) - cov pa xa mus rau ib chav tsev lub sijhawm - thaum microporous aeration kev ua tau zoo yog qhia raws li oxygen siv efficiency EA (%). Qhov no tsis yog qhov sib txawv ntawm chav tsev xwb; nws qhia txog txoj hauv kev sib txawv ntawm kev ntsuas ob lub thev naus laus zis.
| Aeration Device | Oxygen Siv / Oxygenation Peev Xwm | Hwj chim Efficiency (kg O₂/kWh) |
| Aeration txhuam ( kab rov tav ncej) | 7.8-8.3 kg O₂/m·h | 1.5–2.5 |
| Aeration disc (kab rov tav ncej) | 0.6-1.2 kg O₂/disc·h | 1.7–2.2 |
| Nto aerator ( ntsug ncej) | 3.0-130 kg O₂ / h (ua haujlwm ntawm impeller txoj kab uas hla) | 1.8–2.3 |
| Microporous aeration phaj | 7% -25% (EA) | 1.8–2.5 |
| Microporous aeration tube | 10% -20% (EA) | ~2.0 |
Ntau cov lus xaus ua raws ncaj qha los ntawm lub rooj:
Microporous aeration phaj muab qhov siab tshaj plaws EA ntau yam -7%–25%- ntawm tag nrho cov khoom siv sib piv, thaum ua tiav kev siv hluav taws xob (1.8–2.5 kg O₂/kWh) uas sib tw lossis tshaj cov tshuab aerators. Hauv lwm lo lus, lawv hloov cov pa oxygen mus rau hauv cov cawv ntau zoo dua li kev hloov kho tshuab, thiab lawv ua nws yam tsis muaj kev txi lub zog ua haujlwm.
Pa tshuab tshuab aerators ntsuas lawv lub peev xwm oxygenation los ntawm lub cev qhov ntev - txhuam ntev, disc suav, impeller txoj kab uas hla. Qhov ntawd ua rau lawv cov zis ruaj khov ntawm kev teeb tsa thiab tsis hloov pauv raws li qhov hloov pauv hloov tau. Lub microporous system, los ntawm qhov sib txawv, tuaj yeem hloov pauv huab cua tsis tu ncua los ntawm kev tswj lub tshuab.
Microporous tube diffusers muab kev sib xyaw ua ke ntawmEA ntawm 10% -20%thiab kev saib xyuas kev nkag mus tau yooj yim, ua rau lawv xaiv qhov ua tau zoo rau retrofits qhov twg kev nkag tau txwv.
Cov yam ntxwv ntawm Microporous Aeration Oxidation Ditches
Independent Control ntawm Aeration thiab Mixing
Lub ntsiab lus kom zoo dua ntawm microporous aerator + submersible pusher configuration yog tias nws tag nrho cais cov pa oxygen los ntawm ntws propulsion. Nyob rau hauv ib tug pa kwj dej, ib tug neeg kho tshuab aerator ib txhij yuav tsum tau raws li ib tug hydraulic yuav tsum tau (tso tseg khiav ceev saum toj no0.3 m/stiv thaiv sludge kev sib hais haum) thiab ib qho kev xav tau lom neeg (ua kom muaj pa oxygen rau qhov kev thov ua pa). Thaum lub sij hawm qis - lub sijhawm thauj khoom - huab cua los nag, cov pa oxygen muaj zog ntau - ua tau raws li qhov yuav tsum tau ua ntawm hydraulic quab yuam ntau dhau aeration, uas cuam tshuam cov cheeb tsam anoxic xav tau rau kev tshem tawm cov nitrogen thiab phosphorus lom.
Nrog cov cuab yeej sib cais, cov pa oxygen yaj thiab ntws nrawm tau tswj nws tus kheej. Cov neeg ua haujlwm tuaj yeem tuav thaj chaw aerobic ntawm qhov tseeb ntawm DO uas yuav tsum tau muaj rau nitrification thaum lub submersible pusher tswj kev ncig, thiab tuaj yeem nthuav lossis txo qis ntawm thaj chaw anoxic ntawm qhov xav tau los ntawm kev xa ib lub tsev txhab nyiaj aerator rau lossis tawm. Qhov kev hloov pauv no yog dab tsi ua rau kev tshem tawm cov khoom noj khoom haus sib sib zog nqus hauv cov ditch geometry.
Key Tsim Parameters
Table 2 piav qhia txog lub hnab ntawv tsim rau microporous aeration oxidation ditch configured rau kev tshem tawm cov khoom noj.
| Parameter | Tsim tus nqi |
| Sludge loading tus nqi | 0.05-1.0 kg BOD / (kg MLSS·h) |
| Volumetric loading tus nqi | 0.15-0.3 kg BOD / (m³·d) IB |
| MLSS concentration | 2,500–5,000 mg/L |
| Hydraulic tuav lub sij hawm (HRT) | 10–20 h |
| Lub Sijhawm Retention (SRT) | 10–30 d |
| Aerobic zone DO | 2-3 mg/l |
| Anoxic zone DO | < 0.5 mg/L |
| Anaerobic zone HRT / DO | 0.9–2.0 h / ≈ 0.1 mg / L (ze xoom) |
| Sludge ntau lawm tus nqi | 0.3 kg / kg BOD tshem tawm |
Qhov Zoo Tshaj Plaws
Superior oxygenation thiab sib tov.Zoo- npuas aeration ua ke nrog submersible pushers xyuas kom cov pa oxygen yaj ntawmNtau dua lossis sib npaug li 1-2 mg / L ntawm qhov hluav taws xob ditch, tswj kev sib xyaw cawv ntau tshaj lossis sib npaug li 0.3 m / s los tiv thaiv sludge nyob, thiab ua tiav cov pa roj carbon oxidation thiab nitrification thoob plaws qhov ntim tag nrho.
Kev tshem tawm cov zaub mov zoo heev.Configured raws li tus txheej txheem A²/O nrog ua ntej -anoxic thiab anaerobic zones, microporous aeration oxidation ditches xa nitrogen thiab phosphorus tshem tawm uas tsis tu ncua raws li Chav Kawm 1A ntawm GB 8978–1996 - cov chav kawm tawm hauv nroog nruj tshaj plaws.
Kev ua haujlwm yooj yim.Cov khoom siv cua yog hloov kho los ntawm kev tswj lub tshuab ua haujlwm tawm hauv cov lus teb rau cov dej ntws thiab thauj khoom. Ib tus neeg aerators tuaj yeem hloov mus lossis tawm los hloov qhov ntev ntawm aerobic thiab anoxic aav, hloov cov txheej txheem los hloov cov xwm txheej zoo yam tsis muaj kev kho dua tshiab.
Deep tank peev xwm.Microporous aeration ua rau muaj txiaj ntsig dej tob ntawm6m sau, txo cov av hneev taw thiab txhim kho kev ua tau zoo nyob rau hauv qis - qhov kub thiab txias - qhov zoo tshaj plaws hauv cov nroog ntom ntom uas cov av tsis tshua muaj peev txheej.
Zog efficiency thiab txo cov ntxhiab tsw.Cov tshuab microporous siv lub zog tsawg dua li kev siv tshuab aeration thiab tsim kom muaj ntxhiab tsw ntau, vim tias cov pa oxygen nkag mus rau hauv qab dej saum npoo av uas aerosols tsis tuaj yeem khiav.
Tej teeb meem thiab kev daws teeb meem
Thawj qhov kev sib tw ua haujlwm rau microporous aerators yogfouling thiab clogging. Vim tias cov pores me me, lawv muaj peev xwm ua rau muaj kev cuam tshuam los ntawm cov roj pos huab, plua plav, xeb, thiab cov yeeb yaj kiab lom neeg. Cov kev tiv thaiv hauv qab no raug pom zoo:
Cov cua nkag mus rau lub tshuab tshuab yuav tsum tau lim - los ntawm electrostatic los nag lossis lub hnab lim dej - txhawm rau tiv thaiv cov roj pos huab thiab cov khoom me me los ntawm kev nkag mus rau huab cua. Cov txheej txheem thoob ntiaj teb pom zoo kom tshem tawmNtau tshaj lossis sib npaug li 95% ntawm 2 μm hais(UK) los yog plua plav cov ntsiab lus hauv qab no1.5 mg / 1000 m³(Fabkis).
Cov pa xa hluav taws xob yuav tsum yog stainless hlau lossis yas. Cov pa roj carbon steel kav yuav tsum muaj kev tiv thaiv sab hauv los tiv thaiv -corrosion txheej los tiv thaiv cov kab xeb los ntawm kev ncav cuag cov ntsiab lus microporous.
Condensate drains yuav tsum tau muab ntsia rau ntawm qhov kawg ntawm huab cua faib headers rau lub sij hawm tshem tawm ntawm cov dej khaws tseg - cov dej noo noo accelerates lom fouling.
Microporous systems yog qhov yooj yim rau hluav taws xob tawm. Cov khoom siv hluav taws xob dual lossis cov tshuab hluav taws xob standby tau pom zoo, thiab cov khoom siv cua tsawg tsawg yuav tsum tau tswj xyuas thaum muaj kev kub ntxhov los tiv thaiv sludge deposition ntawm qhov chaw diffuser. Kev kaw ib ntus yuav tsum tsis pub tshaj4 hnu; Yog tias lub tank raug tshem tawm ntawm kev pabcuam, nws yuav tsum tau ntim nrog dej huv mus rau qhov tob ntawm 1.0-1.2 m.
Cov dej khib nyiab yuav tsum tau txais kev kho kom zoo kom txo tau cov khib nyiab thiab cov khib nyiab pov tseg nkag mus rau hauv thaj chaw aeration. Thaum lub qhov hws dhau los ua txhaws, cov txheej txheem rov tsim dua tshiab suav nrog kev ntxuav dej, ntxuav cov kua qaub, siab - qhov kub thiab txias, los yog kev txiav cov tshuab deg - txoj kev tsim nyog nyob ntawm hom diffuser. Nrog kev tswj kom raug, fouling tuaj yeem tswj tau zoo.
Qhov kev sib tw ua haujlwm thib ob yogkev saib xyuas yooj yim. Tsis zoo li cov aerators saum npoo av, microporous aerators feem ntau xav tau lub tank tso rau kev tshuaj xyuas thiab hloov. Kev pabcuam lub neej yog feem ntau4-5 xyoosrau cov khoom siv hauv tsev thiab mus txog 8-10 xyoo rau cov khoom zoo. Yuav kom txo qis kev cuam tshuam, cov tshuab yuav tsum tau tsim nrog ntau yam ntawm nws tus kheej ua haujlwm aeration zones lossis liftable diffuser thav ntawv.
Engineering Case Study: Zhaoqing WWTP
Zhaoqing Municipal Wastewater Treatment Plant nyob rau hauv Guangdong xeev, nrog rau tag nrho cov peev xwm ntawm50,000 m³/d, qhia txog microporous aeration oxidation ditch txheej txheem ntawm tag nrho engineering nplai. Table 3 qhia txog cov xwm txheej tsim.
| Parameter | Tus nqi |
| Kev kho muaj peev xwm | 50,000 m³/d |
| Influent COD | Tsawg dua lossis sib npaug li 250 mg / L |
| Influent BOD ₅ | Tsawg dua lossis sib npaug li 150 mg / L |
| Influent SS | Tsawg dua lossis sib npaug li 150 mg / L |
| Influent NH₃-N | Tsawg dua lossis sib npaug li 35 mg / L |
| Influent PO₄³⁻-P | Tsawg dua lossis sib npaug li 3 mg / L |
| Muaj zog pH | 6–9 |
| Txheej txheem khiav | Inlet → Coarse screen → Pump station → Fine screen → Grit chamber → Pre-anaerobic tank → Anoxic microporous aeration oxidation ditch → Final clarifier → Effluent tank → Discharge |
| Sludge dewatering | Siv lim xovxwm nrog concentration muaj nuj nqi (tsis muaj digestion) |
| Tag nrho kev nqis peev | 65 lab RMB |
| Tag nrho thaj av | 25,000 m² |
| Kev ua haujlwm / ua haujlwm tag nrho | Lub Xya Hli 2000 / Cuaj Hlis 2000 |
Cov txheej txheem tsheb ciav hlau yog compact: lub pre-anaerobic tank ua raws li anoxic microporous aeration oxidation ditch, nrog rau qhov kawg clarifier. Cov av qis qis -25,000 m²rau 50,000 m³ / d tsob nroj - yog ib qho txiaj ntsig ncaj qha ntawm qhov tob - lub peev xwm hauv phiab uas nplua - npuas aeration enables.
Table 4 qhia txog cov txiaj ntsig tau txais txiaj ntsig zoo, txheeb xyuas los ntawm Guangdong Provincial Environmental Monitoring Center thaum Lub Kaum Ob Hlis 2000. Txhua qhov ntsuas tau ua tau los yog dhau ntawm Chav Kawm 1A tus qauv ntawm GB 8978–1996.
| Parameter | Cov concentration ntawm dej | Chav Kawm 1A Standard (GB 8978-1996) |
| COD | < 25 mg/L | Tsawg dua lossis sib npaug li 60 mg / L |
| BOD ₅ | < 15 mg/L | Tsawg dua lossis sib npaug li 20 mg / L |
| SS | < 9 mg/L | Tsawg dua lossis sib npaug li 20 mg / L |
| NH₃-N | < 9 mg/L | Tsawg dua lossis sib npaug li 15 mg / L |
| PO₄³⁻-P | < 0.45 mg/L | Tsawg dua lossis sib npaug li 0.5 mg / L |
Cov nroj tsuag dhau qhov kev lees paub lees paub los ntawm Guangdong Provincial Department of Construction onLub Xya Hli 20, 2001. Cov kev ntsuas kev ua haujlwm tseem ceeb tau lees paub qhov kev siv thev naus laus zis cov ntaub ntawv ua haujlwm tau zoo:
Kev siv zog ntawm0.19 kWh/m³- tshwj xeeb tshaj yog daim duab no txawm suav nrog lub chaw tso dej nyob 1,100 m ntawm cov nroj tsuag, yog li cov txheej txheem aeration nws tus kheej yog qhov ua tau zoo dua.
Tshaj sludge ntau lawm ntawm2.5–4.5 t/d(cov khib nyiab qhuav) thiab PAM noj ntawm 13-15 kg / d - cov tshuaj lom neeg thiab cov sludge- tuav cov kev xav tau uas ua rau cov nqi khiav lag luam qis.
Cov ntaub ntawv no qhia tau hais tias cov txheej txheem microporous aeration oxidation ditch ua tiav kev kho zoo nrog kev siv hluav taws xob tsawg, kev siv av tsawg, thiab ruaj khov ntev - lub sijhawm ua haujlwm - tag nrho cov ntsiab lus tseem ceeb rau kev kho dej khib nyiab hauv nroog.
Cov ntsiab lus thiab cov lus pom zoo
Microporous aerators muab kev siv oxygen ntau tshaj plaws (7%–25%) ntawm cov khoom siv oxidation ditch aeration, nrog lub zog ua haujlwm (1.8-2.5 kg O₂/kWh) muab piv rau cov kev hloov kho tshuab.
Lub microporous aerator + submersible pusher configuration enables ywj siab tswj ntawm aeration thiab mixing - ib tug txiav txim kom zoo dua mechanical aeration rau lom nutrient tshem tawm, vim hais tias nws tso cai rau cov txheej txheem tuav tsawg -DO anoxic aav thaum tuav hydraulic mixing.
Tsim kom zoo ntawm submergence qhov tob thiab npuas taub yog qhov tseem ceeb rau kev ua kom zoo dua EA thiab EP. Sib sib zog nqus tsis yog ib txwm zoo dua; qhov kev xaiv ua ke yuav tsum zaum ntawm qhov nce ntawm EP nkhaus.
Fouling thiab clogging tuaj yeem tswj tau zoo los ntawm kev pom huab cua kom zoo, cov ntaub ntawv tsim nyog piping, standby fais fab system, thiab kev saib xyuas tsis tu ncua.
Zhaoqing WWTP validates thev naus laus zis muaj peev xwm ua tau raws li cov qauv kev tso tawm nruj heev -COD < 25 mg/L, BOD₅ < 15 mg/L, SS < 9 mg/L, NH₃-N < 9 mg/L, PO₄³⁻-P < 0.45 mg/L- ntawm kev siv hluav taws xob nkaus xwb0.19 kWh/m³.
Microporous aeration oxidation ditch thev naus laus zis muab cov lus teb txaus nyiam rau cov kev sib tw hauv nroog loj ntawm "muaj peev xwm tsim tau tab sis tsis muaj peev xwm ua haujlwm tau" - sib txuas cov peev nyiaj qis, cov nqi khiav lag luam tsawg, thiab kev kho mob txhim khu kev qha.
Peb Microporous Aeration Solutions Rau Oxidation Ditches
Raws li xyoo dhau los ntawm kev siv tshuab aeration, peb lub tuam txhab muaj ntau yam ntawm microporous aeration khoom optimized rau oxidation ditch daim ntaub ntawv:
Fine npuas disc diffusers.EPDM membrane diffusers nrog20-50 μm pore loj, siab oxygen hloov efficiency, thiab tsim kev pab cuam lub neej ntawm 5-8 xyoo.
Microporous tube diffusers.Rigid corundum los yog saj zawg zog membrane raj diffusers rau oxidation ditch retrofits thiab tshiab installation, muab ib tug sib npaug ua ke ntawm efficiency thiab kev saib xyuas.
Liftable aeration ncej systems.Modular diffuser thav duab uas tuaj yeem tsa tau rau kev tshuaj xyuas thiab kev saib xyuas yam tsis muaj tank tso dej - ncaj qha hais txog kev nkag mus tau yooj yim sib tham saum toj no.
Submersible pusher / tov khoom pob.Matched flow propulsion khoom rau microporous aerator + pusher ua ke configuration.
Ua kom tiav qhov system tsim.Aeration layout optimization, blower xaiv, piping tsim, thiab tswj kev sib koom ua ke.
Hauv -kev ntsuas kev ua haujlwm ntawm qhov chaw.Tawm- qauv roj thiab kev kuaj dej huv kom paub tseeb tias cov pa oxygen hloov pauv tau zoo raws li koj qhov kev ua haujlwm - vim tias qhov chaw- kev pov thawj tshwj xeeb yog tib txoj kev txhim khu kev qha kom paub meej tias kev ua haujlwm aeration.
Txiav Oxidation Ditch Zog rau 0.19 kWh / m3
Microporous aerators xa 7-25% kev siv cov pa oxygen nrog kev ywj pheej anoxic-zone tswj. Saib yuav ua li cas Juntai microporous diffusers tuaj yeem hloov kho koj qhov oxidation ditch.