I. Cov Ntsiab Cai
Cov txheej txheem activated sludge yog feem ntau siv aerobic biochemical kev kho dej khib nyiab.
Nws lub hauv paus ntsiab lus tseem ceeb yog siv cov activated sludge-flocculent sludge tsim los ntawm kev sib sau ua ke ntawm ntau cov kab mob (cov kab mob, fungi, protozoa, thiab lwm yam.)- kom decompose organic teeb meem hauv dej nyob rau hauv aerobic tej yam kev mob, yog li purifying dej khib nyiab.
II. Cov Ntsiab Cai
1. Adsorption: Qhov saum npoo ntawm cov activated sludge flocs adsorbs organic teeb meem, colloids, thiab tshem tawm cov khib nyiab los ntawm cov dej khib nyiab.
2. Oxidative Decomposition: Nyob rau hauv aerobic tej yam kev mob, microorganisms siv cov organic teeb meem raws li ib tug nutrient thiab lub zog qhov chaw, decomposing nws mus rau hauv ruaj khov inorganic tshuaj xws li CO₂, H₂O, NH₃, thiab PO₄³⁻.
3. Cell Synthesis: Qee cov organic teeb meem hloov mus rau hauv cov kab mob microbial tshiab, ua kom cov sludge ntim.
4. Sedimentation thiab sib cais
Cov sludge kho tau- dej sib tov nyob hauv lub tank thib ob, ua tiav cov sludge- dej sib cais. Lub supernatant raug tso tawm, qee cov sludge yog rov siv dua, thiab cov sludge tshaj tawm tawm.
Nyob rau hauv luv luv: Microorganisms haus cov pa phem → loj hlob → tswm ciab → dej yuav ntshiab.
III. Basic Cheebtsam (tsib lub ntsiab Cheebtsam)
1. Aeration Tank: Qhov chaw rau microbial cov tshuaj tiv thaiv thiab degradation ntawm cov organic teeb meem.
2. Aeration System: Muab cov pa oxygen thiab sib tov cov sludge.
3. Secondary Sedimentation Tank: Sib cais cov sludge thiab dej, ua kom pom tseeb effluent.
4. Sludge Return System: Rov qab sludge los ntawm hauv qab ntawm lub tank thib ob mus rau lub tank aeration kom tswj cov microbial concentration.
5. Excess Sludge Discharge System: Tshem tawm cov hnub nyoog sludge, ua kom lub cev ruaj khov.
IV. Core Indicators
1. MLSS (Mixed Liquor Suspended Solids)
Qhov concentration ntawm activated sludge nyob rau hauv lub aeration tank, xav txog tus naj npawb ntawm cov kab mob.
2. SV (Sludge Settling Ratio): Lub ntim piv ntawm sludge tom qab 30 feeb ntawm kev daws teeb meem, siv los ntsuas kev daws teeb meem.
3. SVI (Sludge Volume Index): Txiav txim siab seb cov sludge puas loj, xoob, los yog tsis zoo.
4. DO (Dissolved Oxygen): Feem ntau tswj nyob ib ncig ntawm 2 mg/L kom paub meej cov tshuaj aerobic.
5. Sludge Retention Time (SRT): Lub sijhawm nyob nruab nrab ntawm cov kab mob hauv lub cev, cuam tshuam rau kev kho mob thiab kev tsim cov sludge.
V. Txheej txheem
Cov dej khib nyiab → Bar Screen → Grit Chamber → Aeration Tank (Aeration) → Secondary Settling Tank
↓ Secondary Settling Tank Sludge: Ib feem ntawm nws raug xa rov qab mus rau lub tank aeration, thiab ib feem yog tawm raws li cov sludge ntau dhau.
VI. Qhov zoo thiab qhov tsis zoo
Qhov zoo
• Kev kho mob siab, kev tshem tawm zoo heev ntawm COD, BOD, thiab SS
• Kev ua haujlwm paub tab, siv tau dav (cov dej phwj hauv nroog, dej khib nyiab)
• Cov hneev taw me me, ruaj khov effluent zoo
Qhov tsis zoo
• Kev siv hluav taws xob ntau (siv hluav taws xob rau kev siv aeration)
• Cov kev tswj xyuas siab, ua rau sludge bulking, foaming, thiab ntab
• Tsim cov sludge ntau dhau, yuav tsum tau kho ntxiv
VII. Siv tau Scope
• Cov dej phwj tuaj hauv nroog
• Cov dej khib nyiab uas muaj biodegradability zoo (khoom noj khoom haus, brewing, luam ntawv thiab dyeing, tshuaj, thiab lwm yam)