I. Pretreatment Section (Kev tshem tawm cov khib nyiab loj thiab pob zeb, tiv thaiv cov khoom siv)
1. Coarse Screen: 10-20mm qhov sib nrug, cuam tshuam cov ceg ntoo, hnab yas, ntaub, thiab cov khib nyiab loj. Kev tshuaj ntsuam yog nias thiab thauj mus rau qhov chaw pov tseg.
2. Inlet Pump chaw nres tsheb: nce qib dej khib nyiab kom ntseeg tau tias lub ntiajteb txawj nqus ntws tom qab.
3. Fine Screen: 3-5mm sib nrug, tshem tawm cov plaub hau, cov ntawv me me, thiab cov khoom siv yas.
4. Cyclone Grit Chamber: Centrifuges cais cov xuab zeb thiab gravel. Tom qab xuab zeb- sib cais dej, cov xuab zeb raug thauj mus los ntawm- qhov chaw kom tsis txhob hnav ntawm lub twj tso kua mis, lub taub hau aeration, thiab cov kav dej.
II. Primary Treatment (Primary Sedimentation, Removal of Suspended Organic Matter)
Primary Sedimentation Tank ( Kab rov tav / Radial Flow): Cov dej khib nyiab tau tso cai rau 1-2 teev, tshem cov av thiab cov khib nyiab pov tseg. Scum yog scraped tawm; sludge raug tso tawm mus rau hauv qhov chaw nres tsheb sludge, thiab cov supernatant nkag mus rau hauv seem kev kho mob lom. Cov chaw kho dej me me tuaj yeem tshem tawm thawj cov dej khib nyiab.
III. Secondary Biological Treatment (AAO / A² / O core rau nitrogen thiab phosphorus tshem tawm, cov khoom siv hauv nroog)
1. Anaerobic Tank
• Tsis muaj aeration, DO≈0
• Polyphosphate- khaws cov kab mob tso tawm phosphorus, npaj rau phosphorus tom ntej; hydrolyzes loj molecular organic teeb meem.
2. Anoxic Tank
• Kev ntxhov siab nkaus xwb, tsis muaj aeration
• Cov kab mob denitrifying siv cov pa roj carbon monoxide los ntawm cov dej nyoos los txo cov nitrate nitrogen rau nitrogen gas rau kev tshem tawm, ua tiav cov nitrogen tshem tawm.
3. Aerobic Tank (Aeration Tank)
• Nruam aeration, DO 2 ~ 3mg/L
• Nitrification: Ammonia nitrogen → Nitrite nitrogen → Nitrate nitrogen;
• Ntau dhau phosphorus uptake los ntawm polyphosphate-accumulating kab mob;
• Degradation ntawm COD, BOD, thiab lwm yam organic pollutants; Ua kom cov sludge cov ntaub ntawv nyob rau hauv lub tank, thiab cov dej cawv sib tov rov qab mus rau lub tank anoxic kom muab nitrate nitrogen.
IV. Secondary Sedimentation (Sludge-Kev sib cais dej)
Secondary Sedimentation Tank (Radial Flow Type): Cov dej cawv lom neeg sib xyaw ua ke thiab qhia meej txog cov dej ntws tawm; hauv qab activated sludge yog muab faib ua ob kwj:
1. Sludge Rov qab: Rov qab mus rau lub tank anaerobic kom tswj tau qhov MLSS concentration hauv lub tank lom;
2. Cov sludge ntau dhau: Cov sludge ntau dhau raug tso tawm thiab nkag mus rau hauv cov txheej txheem kho sludge.
V. Kev kho mob siab tshaj (yuav tsum tau rau Class A Discharge Standards)
1. Coagulation Sedimentation Tank: PAC thiab PAM yog ntxiv rau precipitate colloidal phosphorus thiab tshem tawm cov khib nyiab, ntxiv txo TP thiab SS.
2. Filtration Tank: Quartz xuab zeb lim / fiber ntau lim cuam tshuam cov khib nyiab zoo, txo qis SS effluent.
3. Disinfection Tank: Sodium hypochlorite/ultraviolet disinfection tua cov kab mob xws li E. coli, ua kom cov dej ntws tawm raws li cov qauv tso tawm mus rau hauv tus dej.
VI. Ua kom tiav Sludge Treatment Line (Full Process)
Tshaj sludge → Sludge thickening tank → Sludge dewatering chav (PAM ntxiv, ntsia hlau xovxwm / siv dewatering) → Sludge ncuav mog qab zib pov tseg (tua pov tseg, incineration, composting); Cov concentrated supernatant thiab dewatered filtrate raug xa rov qab mus rau qhov cuam tshuam rau kev rov ua dua.
Simplified tag nrho cov txheej txheem txoj kev:
Influent → Coarse screen → Booster pump → Fine screen → Grit chamber → Primary sedimentation tank → AAO biological treatment tank (anaerobic → anoxic → aerobic) → Secondary sedimentation tank → Deep coagulation sedimentation → Filtration → Disinfection Meeting → Effluent
Sludge ceg: Thawj sludge + tshaj sludge → Thickening → Dewatering → Sludge thauj