Taw qhia
Kev kho anaerobic lom yog cov txheej txheem kho dej khib nyiab uas rhuav tshem cov pa phem hauv qhov tsis muaj oxygen. Nws tso siab rau cov kab mob anaerobic los hloov cov organic compounds rau hauv cov khoom yooj yim, feem ntau methane (CH₄) thiab carbon dioxide (CO₂). Txoj kev no yog dav siv rau siab -lub zog muaj dej khib nyiab thiab sludge stabilization vim nws lub zog efficiency thiab tsawg sludge ntau lawm.
Qhov zoo ntawm kev kho anaerobic tshaj li kev kho mob aerobic
1. Ntau dua Organic Loading Capacity
- Qhov raug sludge loading (F / M) rau kev kho anaerobic ntawm cov dej khib nyiab yog0.5-1.0 kg BOD₅/(kg MLVSS·d), ntau tshaj ob zaug ntawm cov txheej txheem aerobic (0.1-0.5 kg BOD₅/(kg MLVSS·d)).
- Vim tsis muaj kev txwv tsis pub hloov oxygen, lubMLVSS (Mixed Liquor Volatile Suspended Solids)hauv anaerobic systems tuaj yeem ncav cuag5-10 zauguas yog aerobic systems.
- Organic volumetric loading tus nqi rau kev kho mob anaerobic yog5-10 kg BOD₅/(m³·d), piv rau xwb0.5-1.0 kg BOD₅/(m³·d)rau kev kho aerobic-a10-fold sib txawv.
2. Tsawg Sludge Production & Zoo dua Sludge zoo
- Kev kho anaerobic tsuas yog tsim tawm xwb5%–20%biomass tsim nyob rau hauv cov txheej txheem aerobic.
- Cov txheej txheem aerobic tsim0.25-0.6 kg ntawm sludge ib kg ntawm COD tshem tawm, thaum txoj kev anaerobic tawm los xwb0.02-0.18 kg, nrog zoo dewaterability.
- Anaerobic digestion kujtua kab mob qenyob rau hauv sludge, kev txhim kho nws huv si thiab tshuaj stability, txo sludge pov tseg nqi.
3. Txo cov khoom noj kom tsawg & kev ua haujlwm yooj yim
- Anaerobic microbes xav tautsuas yog 5% -20%ntawm cov as-ham (N, P) xav tau los ntawm cov txheej txheem aerobic, ua rau lawv haum rau cov khoom noj khoom haus - tsis muaj dej khib nyiab.
- Cov kab mob anaerobic tseem ua haujlwm rauhli los yog xyootsis muaj qhov poob qis thiab tuaj yeem rov pib sai sai tom qab kaw, tso caikev ua haujlwm tsis sib xws(zoo tagnrho rau cov dej khib nyiab raws caij nyoog).
4. Kev txuag hluav taws xob & Methane ntau lawm
- Kev kho aerobic noj0.5-1.0 kWhntawm hluav taws xob ib kg ntawm COD tshem tawm rau aeration, thaum anaerobic systemstshem tawm cov nqi aeration.
- Anaerobic digestiontsim methane, yiv over 12,000 kJ ntawm lub zog ib kg ntawm COD tshem tawm.
- Tsis muaj teeb meem ua npuas ncauj (tsis zoo li kev kho aerobic ntawm surfactant- muaj cov dej khib nyiab).
5. Txo cov pa phem & muaj peev xwm degradation ntau dua
- Aerobic aeration tuaj yeemvolatilize organic tebchaw, ua rau huab cua muaj kuab paug, whereas anaerobic systems zam qhov teeb meem no.
- Anaerobic microbes tuaj yeem ua taudegrade tej recalcitrant compounds(piv txwv li, chlorinated hydrocarbons) uas cov kab mob aerobic ua tsis tau.
6. Complex Microbial Synergy rau kev txhim kho kev puas tsuaj
- Anaerobic digestion koom nrog ntau haiv neeg microbial cov zej zog ua haujlwm sib koom ua ke, ua rau kev tawg ntawm nyuaj - rau -degrade organics uas kho aerobic tsis tuaj yeem ua tiav.
Disadvantages ntawm Kev Kho Mob Anaerobic
1. Kev loj hlob qeeb microbial & Lub sijhawm pib ua haujlwm ntev dua
- Anaerobic microbes loj hlob qeeb, xav tauLub sijhawm pib ua haujlwm ntev dua thiab lub sijhawm tuav hydraulic (HRT)tshaj aerobic systems.
2. Effluent yuav tsum tau kho ntxiv
- Anaerobic effluent feem ntautsis ua raws li cov qauv tso tawmthiab yuav tsum yogpolished nrog aerobic kev kho mob.
3. Alkalinity Supplementation Xav tau rau qis -C/N Cov dej khib nyiab
- Tsawg-concentration lossis qis-C/N cov dej khib nyiab yuav tsis muaj alkalinity, yuav tsum tausab nraud alkalinity ntxiv.
4. Yuav tsum muaj cua sov rau tsawg-Cov dej khib nyiab
- Yog tias kev tsim cov methane tsis txaus los tswj qhov kub thiab txias(30-38 degree), cua sov sab nraudyog tsim nyog.
5. Kev puas tsuaj los ntawm Methane
- Biogas (CH₄ + CO₂ + H₂S) yogflammable thiab tawg, xav tautawg- pov thawj reactor tsim.
6. rhiab heev rau cov tshuaj lom
- Chlorinated aliphatics thiab lwm yam co toxinsinhibit methanogenshnyav dua li aerobic heterotrophs; Kev ua haujlwm tsis raug tuaj yeem ua rau lub cev tsis muaj zog.
7. Yuav tsum tau tswj qhov kub thiab txias
- Tsawg kubho txo efficiency, thiab kev tswj xyuas kev ua haujlwm yognyuaj duatshaj hauv aerobic systems.
8. H₂S Odor & Corrosion Issues
- Sulfate (SO₄²⁻) hauv cov dej khib nyiab tsimH₂S, uatswthiabcorrosion nyob rau hauv cov kav dej, cav, thiab boilers.
- Sulfate txo kujsiv cov organic teeb meem,txo methane tawm los.
9. Tsis muaj Nitrification
- Anaerobic systemstsis tuaj yeem nitrify ammonia; kev ua kom zoo microbial xav tauNH₃-N qib 40–70 mg/L.