Activated sludge yog flocculent sib tov tsim los ntawm ntau cov kab mob. Cov dej khib nyiab thiab sludge tau sib xyaw kom zoo thiab sib cuag. Cov microorganisms haus cov organic teeb meem hauv dej, ces cais cov sludge los ntawm dej. Cov sludge raug xa rov qab mus rau qhov system rau kev ua haujlwm ntxiv.
Cov txheej txheem tau muab faib ua: cov tshuaj tiv thaiv aeration, sludge-kev sib cais dej, sludge rov qab, thiab tshaj sludge tawm.
1. Aeration Tank: Cov dej khib nyiab nkag mus rau hauv lub tank aeration, qhov twg cua yog qhia rau aeration.
stirring kom meej sib tov ntawm cov dej khib nyiab thiab activated sludge; oxygen nkag mus rau cov kab mob; Cov kab mob aerobic noj COD thiab cov organic; nitrifying kab mob hloov ammonia nitrogen rau nitrate nitrogen.
Pom tau, cov flocs yog daj -xim av, flocculent, thiab muaj cov khoom zoo.
2. Secondary Settling Tank - Sludge-Dej Separation: Cov cawv sib xyaw ua ke los ntawm lub ntiajteb txawj nqus mus rau hauv lub tank thib ob, thiab aeration thiab stirring yog nres. Cov activated sludge flocs nyob downwards los ntawm lub ntiajteb txawj nqus. Cov txheej sab saum toj ntshiab yog cov tshuaj tua kab mob, uas tuaj yeem tso tawm lossis kho ntxiv.
3. Sludge Return: Feem ntau ntawm cov sludge uas tau muab tso rau hauv qab yog siv rov qab mus rau pem hauv ntej kawg ntawm lub aeration tank siv lub twj tso kua mis rov qab. Muaj nuj nqi: Nruam ntxiv cov aeration tank nrog cov kab mob ua kom cov kab mob ruaj khov, ua rau lub cev ua haujlwm tsis tu ncua. Yog tsis muaj backflow, cov kab mob tsis tu ncua raug ntxuav tawm los ntawm cov dej ntws, ua rau lub cev sai sai.
4. Tshaj Sludge Discharge: Cov kab mob microorganisms haus cov dej khib nyiab thiab ntau ntxiv, ua rau muaj cov sludge ntau ntxiv. Cov sludge ntau dhau yuav tsum tau tso tawm ib ntus; Cov sludge ntau dhau no hu ua cov sludge ntau dhau thiab raug xa mus rau cov khoom siv sludge dewatering rau kev kho mob.
Kev tso tawm tsawg dhau: Cov sludge concentration siab dhau, yooj yim ua rau sludge bulking thiab ntab sludge.
Kev tso tawm ntau dhau: Cov sludge concentration tsawg dhau, ua rau cov kab mob tsis txaus thiab kev kho tsis txaus.
Ua tiav txheej txheem: Aeration → Secondary sedimentation → Sludge backflow → Tshaj tawm → Nitrogen thiab phosphorus tshem tawm
1. Anoxic theem (tsis muaj oxygen): Denitrifying cov kab mob hloov nitrate nitrogen rau hauv nitrogen gas, uas khiav tawm, ua tiav tag nrho cov nitrogen tshem tawm.
2. Cov theem anaerobic (tsis muaj oxygen): Tsis muaj oxygen, tsis muaj nitrate nitrogen: Polyphosphate- txuam cov kab mob tso tawm phosphorus.
3. Aerobic aeration: Polyphosphate-cov kab mob aggressively nqus phosphorus; Thaum kawg, phosphorus yog nqa tawm ntawm lub cev los ntawm kev tso tawm ntau tshaj sludge.
Common Anomalies thiab lawv nkag siab:
Sludge Bulking: Kev loj hlob ntau dhau ntawm cov kab mob filamentous ua rau cov sludge tsis zoo thiab cov sludge ntab hauv lub tank thib ob.
Sludge Poisoning: Cov tshuaj lom nyob rau hauv lub zog ua rau loj microbial tuag, ua rau kev kho tsis ua haujlwm.
Cov pa oxygen ntau dhau: Cov sludge nws tus kheej yog oxidized, ua rau txo cov sludge ntim; Tsawg Dissolved Oxygen (DO) ntau dhau tiv thaiv cov kab mob los ntawm kev noj cov as-ham txaus, ua rau tsis txaus COD thiab ammonia nitrogen.