AAO Core Control: Sludge Age Priority, Sludge Level Early Warning, Index Verification, Visual Observation, thiab Microscopic Examination Assistance. Tshaj sludge yog tawm los ntawm sludge paug hopper nyob rau hauv qab ntawm lub thib ob settling tank. Rov qab sludge yog rov ua dua tshiab, thiab cov sludge tshaj tawm tawm raws li xav tau.
I. Sludge Age SRT Control (Lub hauv paus tseem ceeb rau AAO Denitrification thiab Phosphorus Tshem Tawm)
AAO phosphorus tshem tawm: 8-12 hnub; simultaneous denitrification: 10-15 hnub (cov dej khib nyiab hauv nroog)
• SRT > Upper Limit: Sludge aging, hnyav phosphorus tsub zuj zuj, theem nrab sedimentation prone rau anaerobic floating sludge → Nce sludge tawm
• SRT < Lower Limit: Tsis txaus activated sludge, deteriorating phosphorus tshem tawm → Txo / ncua sludge tawm
Kev suav cov qauv: SRT=MLSS * Kev Kho Mob Biological Tank Volume / Excess Sludge Discharge * Rov Qab Sludge Concentration
II. Biological Treatment Tank Physicochemical Indicator Kev Txiav Txim Siab (Routine Test)
1. SV30 (Settling Ratio, sampled los ntawm aeration tank effluent)
Tswj: 20% -30%
• >30%: Ua kom tag nrho cov sludge ntim, cov khoom ntim ntau dhau hauv cov dej khib nyiab thib ob → Ua kom cov sludge tawm ntau dhau
• <18%: Insufficient sludge, easily causing turbid effluent → Reduce or stop discharge
Ntsiab lus: ceev ceev nyob rau hauv thawj 5 feeb → Sludge laus; Kev daws teeb meem qeeb heev, qhov muag plooj stratification → Sludge bulking, txo sludge paug
2. MLSS (Mixed Liquor Species) Concentration
AAO (Accumulated Acid{0}}Oxygen Algorithm) Txuj 3000-4000mg/L
• MLSS > 4500mg/L: System sludge enrichment, Secondary sediment sludge rise → Continuous sludge paug
• MLSS <2200mg/L: Sludge poob, nres sludge tawm thiab khaws cia sludge ntim
3. SVI (Sludge Volume Index): SVI=SV30/MLSS (g/L)
• 70-150mL/g: Noj qab nyob zoo sludge, ib txwm sludge paug
•> 150: Sludge bulking, txom nyem, txo sludge tawm los ntawm ib nrab los tiv thaiv sludge poob
• <50: Sludge aging and fragmentation significantly reduces sludge discharge.
III. Sludge Level nyob rau hauv Secondary Settling Tank (Nyob nrawm tshaj plaws thiab yooj yim tshaj plaws ntawm -kev ntsuas qhov chaw)
Kev ntsuas kev ntsuas
1. Kev sojntsuam iav: Ntxig ib lub raj pob tshab vertically rau hauv qab ntawm lub tank thiab nqa nws los nyeem cov sludge -dej interface qhov siab; coj tus nqi nruab nrab ntawm ntau lub ntsiab lus (nruab nrab thiab 3-5 cov ntsiab lus raws ntug tank).
2. Online Sludge Interface Meter: Tiag - lub sijhawm ntsuas ultrasonic, cov cuab yeej txheem hauv cov nroj tsuag dej loj.
Sludge Discharge Threshold (Nyob rau hauv dej tob H)
• Sludge Level > H × 1/3: Cov sludge ntau dhau; tam sim ntawd nce sludge tawm kom tiv thaiv sludge los ntawm floating thaum lub sij hawm denitrification.
• Sludge theem < H × 1/4: Sludge ntim tsawg; txo sludge paug kom paub meej txaus rov qab sludge ntim. Sludge txheej nrug deb ntawm effluent weir < 0.5m: Thaum muaj xwm ceev loj - nplai sludge tawm los tiv thaiv sludge overflow nrog effluent thiab ntau SS qib.
IV. Kev tshuaj xyuas ntawm Secondary Settling Tank Appearance (Visual Inspection)
1. Yuav tsum tau ua kom cov sludge tawm
① Patch ntawm daj / xim av ntab sludge nrog cov pa npuas zoo rau saum npoo (denitrification sludge, ntev sludge tuav ua rau anaerobic roj ntau lawm)
② Turbid effluent, cia li nce nyob rau hauv SS thiab TP, nplua sludge flocs ntab rau ntawm lub effluent weir
③ Dub thiab qias neeg - tsw qab sludge nrog hydrogen sulfide tsw (sludge lwj)
2. Yuav tsum tau txo qis / tshem tawm sludge tawm
① Ntshiab nto, tsis muaj sludge ntab, tab sis SV30 tseem poob qis
② Me me thiab xoob flocs, whiteish supernatant (sludge disintegration, sludge ntim tsis txaus)
V. Kev Pabcuam: Kev kuaj xyuas me me + Cov dej ntws zoo thiab cov dej tsis zoo
1. Microscopic examination: Decreased or dying Vorticella and rotifers → sludge aging, increase sludge discharge; Filamentous bacteria surge >30% → bulking, tswj sludge tawm.
2. Effluent indicators, As Nruam tshaj TP cov qauv hauv effluent (ntau tshaj phosphorus tso tawm los ntawm polyphosphate- accumulating kab mob, ntau sludge hnub nyoog) → nce paug; nce ammonia nitrogen thiab tsis txaus nitrification → txo cov paug kom tswj tau MLSS.
AAO Sludge Discharge Practical Guidelines
Tshem tawm sludge nquag thaum sludge hnub nyoog tshaj tus qauv; tawm tam sim ntawd thaum sludge qib siab tshaj 30; tawm sludge thaum SV tshaj 30; txo sludge paug thaum SVI siab; nquag tso cov sludge ntab rau ntawm lub pas dej; nres tso tawm sludge thaum cov dej ntws tawm dawb.
