Fault Analysis thiab Renovation Scheme ntawm Aeration System
Taw qhia
Covaeration systemRaws li ib qho ntawm cov khoom siv hauv kev kho dej khib nyiab lom neeg, feem ntau ua haujlwm los muab cov pa oxygen xav tau rau cov metabolism hauv microbial thiab tswj cov pa oxygen (DO) concentration nyob rau hauv lub tank lom. Cov vortices generated los ntawm nce npuas thiab qhov cuam tshuam los ntawm lawv cov rupture muab kev sib xyaw zoo ntawm cov activated sludge, tiv thaiv sludge deposition. Rau kev sib cuag lub tank uas muaj cov xov xwm, aeration kuj txhawb nqa lub hnub nyoog biofilm los ntawm qhov chaw tshaj tawm, ua kom yooj yim dua biofilm thiab txhim kho nws cov haujlwm.
Cov kev tshawb fawb qhia tau hais tias kev hloov pauv hauv DO concentration nyob rau hauv lub tank lom ua rau muaj kev hloov pauv hauv hom, kom muaj nuj nqis, qhov xwm txheej ntawm zoogloea, kev ua haujlwm lom neeg, thiab hom metabolic ntawm cov zej zog microbial. Yog li ntawd, cov tshuaj tiv thaiv thiab kev ua tau zoo ntawm cov txheej txheem biochemical xws li kev tshem tawm cov pa roj carbon monoxide, tshem tawm cov nitrogen lom, thiab tshem tawm cov phosphorus lom tau cuam tshuam, hloov cov kev tshem tawm ntawm cov pa phem xws li cov organic teeb meem, ammonia nitrogen, tag nrho phosphorus, thiab tag nrho cov nitrogen hauv cov dej khib nyiab. Kev ua haujlwm ntawm lub tshuab aeration ncaj qha cuam tshuam rau kev tshem tawm cov pa phem microbial, yog li cuam tshuam rau tag nrho kev ua kom huv huv ntawm cov dej khib nyiab (WWTP).
Yog li ntawd, kev tswj hwm lub tshuab aeration hauv kev ua haujlwm zoo yog lub luag haujlwm tseem ceeb hauv WWTP kev ua haujlwm thiab kev saib xyuas.
1. Cov ntaub ntawv thiab cov txheej txheem
1.1 WWTP Txheej txheem cej luam
WWTP nrog lub peev xwm tsim ntawm15,000 m³/d. Cov qauv tsim muaj kuab paug qhia tau qhia hauvTable 1, thiab cov txheej txheem effluent ua tau raws li Qib A tus qauv ntawm "Kev Tso Tawm Ntawm Cov Pua Plag rau Cov Kev Kho Dej Hauv Nroog" (GB 18918-2002). Txoj kev kho tseem ceeb yog:Kev Kho Mob Ua Ntej + Coagulation-Sedimentation + Biological System + Secondary Sedimentation Tank + Kev Kho Mob Advanced.
Thaum xub thawj, vim tsis tau tsim cov kev sib sau ua ke thiab kev tsim kho tsis tu ncua ntawm cov tuam txhab nyob ib puag ncig, cov nroj tsuag tau ua haujlwm tsis tu ncua vim muaj kev nkag mus tsawg. Raws li cov tuam txhab nyob ib puag ncig tau ua haujlwm, kev nkag mus thiab cov pa phem ntau ntxiv, ua rau cov khoom siv roj ntsha aeration hloov mus rau 24-teev kev ua haujlwm tas mus li, nrog rau cov nqi aeration hloov raws li kev nkag thiab thauj khoom. Nyob rau lub sijhawm no, ob qho tib si lub tank lom thiab aeration system ua haujlwm ruaj khov, nrog rau tag nrho cov dej ntws tsis tu ncua raws li cov qauv.
1.1.1 Biological Tank Description
Cov kab ke lom neeg siv cov txheej txheem zoo ib yam li covtxheej txheem A²/O, suav nrog anaerobic, anoxic, thiab oxic aav. Cov cheeb tsam anaerobic thiab anoxic yog txhua qhov muab faib ua ob ntu ntawm Tandem txheej txheem ntawm qhov sib npaug, thaum thaj tsam oxic muab faib ua plaub. Rau submersible mixers yog ntsia rau hauv anaerobic thiab anoxic aav. Tsau zoo- npuas diffusers tau teeb tsa rau hauv qab ntawm cov ntu hauv thaj chaw anoxic thiab oxic, nrog cov xov xwm imitation retrievable txuas saum toj no diffusers rau kev loj hlob microbial. Lub tshuab aeration siv tshuab tshuab los muab cov cua compressed rau qhov zoo - npuas diffusers ntawm laterals. Aeration tus nqi nyob rau hauv txhua sab yog tswj los ntawm li qub. Peb lub tshuab tshuab tau nruab, ua haujlwm hauv 2-lub luag haujlwm + 1-standby hom.
1.1.2 Fault Description
Tom qab kwv yees li 5 xyoos ntawm kev ua haujlwm ruaj khov, cov sludge tseem ceeb tau ntim rau hauv qab ntawm thaj chaw anoxic thiab oxic. Blowers feem ntau ntsib qhov hluav taws xob siab lub tswb nrov thiab tiv thaiv kev kaw. Qee qhov zoo - npuas diffusers ruptured. Raws li qhov hluav taws xob qhov hluav taws xob txuas ntxiv nce, qhov zaus ntawm lub tshuab tshuab kaw thiab cov naj npawb ntawm cov ruptured diffusers tau nce. Cov huab cua tseem ceeb los ntawm cov diffusers tawg ua rau tsis tu ncua txo DO qib hauv lub tank lom, ua rau maj mam deterioration ntawm effluent zoo. Txhawm rau kom ua raws li, tus naj npawb thiab lub sijhawm ua haujlwm ntawm cov tshuab ua haujlwm tau nce ntxiv. Lub voj voog vicious no ua rau muaj kev puas tsuaj rau cov khoom siv tshuab xws li bearings thiab gears. Thaum kawg, ib lub tshuab blower tau hnav hnyav heev thiab muab pov tseg. Sludge nyob rau hauv oxic cheeb tsam tig xim av tsaus, nrog xoob, foul- ntxhiab zoogloea, thiab cov dej tsis zoo ua rau tsis zoo ntxiv.
1.2 Fault Cause Analysis
Kev tshuaj xyuas cov ntaub ntawv ua haujlwm (kev ua haujlwm zoo, kev siv lub tshuab aeration, kev saib xyuas cov khoom siv) thiab kev soj ntsuam ntawm qhov chaw, cov laj thawj tau txheeb xyuas raws li hauv qab no:
1.2.1 Ua rau Blower puas
- Nquag pib / nres vim qhov pib sib cuam tshuam inflow, ua rau txhua yam hnav.
- Restarting blowers nyob rau hauv siab tom qab overloads shutdowns, thiab ua hauj lwm ntev nyob rau hauv overloads.
- Kev xav tau huab cua ntau dua vim muaj kev ntws ntau dua thiab cov diffusers tawg, ua rau kev ua haujlwm txuas ntxiv.
- Ua haujlwm kub siab vim lub sijhawm ntev overpressure.
1.2.2 Ua rau muaj siab Blower qhov hluav taws xob siab & Diffuser puas
- Ua tsis tiav huab cua piping tu thaum lub sij hawm tsim kho, tawm hauv cov khib nyiab uas clogged diffuser pores.
- Sludge deposition npog diffusers, clogging pores.
- Condensate nyob rau hauv cov yeeb nkab cua clogging diffuser pores.
- Kev sib cuam tshuam aeration ua rau nquag nthuav dav / kev sib cog lus, kev laus diffuser daim nyias nyias, thiab tsis tiav qhov pore qhib, ua rau muaj siab buildup.
- Cov dej khib nyiab / sludge nkag mus rau hauv cov diffusers tawg, dispersing thiab clogging lwm diffusers.
1.2.3 Ua rau hauv qab sludge txuam
- Nquag inflow thiab aeration ua rau deposition.
- Nquag blower faults ua rau tsis sib xws aeration.
- Txo aeration nyob rau hauv laterals nrog ruptured diffusers.
- Tsis zoo aeration kev ua tau zoo nce deposition ntawm inactive biofilm sloughed los ntawm tank thiab media.
1.3 Renovation Scheme
Hais txog qhov ua tsis raug thiab lawv cov laj thawj, xav txog cov qauv inflow thiab xav tau kev ua haujlwm tas mus li, cov txheej txheem kho dua tshiab hauv qab no tau tsim:
Lub tshuab blower irreparable tau hloov nrog ib lub tshuab nqus tsev twj tso kua mis nrog lub peev xwm siab dua thiab kev ntsuas siab tshaj qhov tsim, hloov kho qhov hluav taws xob piping raws li.
Rau cov teeb meem aeration system (high pressure, clogging, rupture, uneven aeration), xav txog cov txheej txheem yuav tsum tau (sib tov siv, huab cua txaus, DO tswj), khoom layout (mixers, piping, media), thiab cov qauv ntawm puas diffusers, cais renovation schemes tau tsim rau lub anoxic thiab oxic aav.
Kev kho dua tshiab ntawm Anoxic Zone: Kev puas tsuaj diffusers tau concentrated nyob rau hauv nruab nrab ntawm Anoxic Tshooj 1 & 2, coinciding nrog sludge tsub zuj zuj. Siv cov ntaub ntawv xov xwm uas twb muaj lawm rau kev txhawb nqa, lub tshuab cua tshiab txuas nrog rau lub ntsiab lus tseem ceeb tau nruab rau hauv lub txaj xov xwm, nrog rau kev tswj xyuas valve. Tshiab downward-oriented perforated kav raug ntsia rau hauv qab ntawm cov xov xwm ncej raws li lub tshiab aeration system. Tus thawj ruaj hauv qab system yog decommissioned. SaibDaim duab 1.
Oxic Zone Renovation: Ib yam li ntawd, cov xov xwm raug tshem tawm nyob rau hauv cov cheeb tsam uas puas lawm diffusers. Ib tug tshiab lateral nrog valve raug ntsia. Tshiab zoo - npuas huab cua discs raug ntsia rau hauv qab ntawm cov xov xwm ncej. Cov kav dej perforated, zoo ib yam li thaj tsam anoxic, kuj tau teeb tsa vertically nyob rau hauv cov kab ntawv xov xwm kom tsis txhob cuam tshuam hauv qab sludge los ntawm kev hloov li qub. Tus thawj ruaj hauv qab system yog decommissioned. SaibDaim duab 2.
2. Cov txiaj ntsig thiab kev tshuaj xyuas
Ua raws li tus kws tsav dav hlau- sim mus kom ze, cov ntu cuam tshuam loj tshaj plaws (Anoxic 1, Oxic 1) tau kho dua tshiab. Cov tsis tseem ceeb (DO, blower siab, sludge thickness) tau saib xyuas rau 30 hnub ua ntej- thiab tom qab- kho dua tshiab. Cov txiaj ntsig tau qhia hauvDaim duab 3thiab soj ntsuam hauvRooj 2.
DO(Daim duab 3a, 3b, Table 2): DO qib tau txhim kho loj heev. Hauv thaj chaw anoxic, DO tau nce los ntawm 0.12-0.23 mg / L (avg. 0.16) mus rau 0.32-0.58 mg / L (avg. 0.46), nce 1.88-fold. Hauv thaj chaw oxic, DO tau nce los ntawm 0.89-2.22 mg / L (avg. 1.78) mus rau 2.81-5.02 mg / L (avg. 4.17), nce 1.34-fold.
Blower Siab(Fig 3c, Table 2): Qhov hluav taws xob siab txo los ntawm 69.2-75.2 kPa (avg. 71.44) mus rau 61.2-63.5 kPa (avg. 62.06), txo qis 0.13-fold.
Sludge Thickness(Fig 3d, Table 2): Hauv qab sludge thickness txo los ntawm 27.3-33.4 cm (avg. 30.00) mus rau 14.2-28.8 cm (avg. 20.75), ib tug 0.31-fold txo.
Kev soj ntsuam cov activated sludge post-kev kho dua tshiab tau pom tias muaj kev ua haujlwm zoo dua, hloov xim, thiab zoogloea loj hlob zoo dua ntawm cov xov xwm, qhia txog kev rov ua haujlwm. Foul odors ceased.
Effluent zoo txhim kho: nruab nrab Ammonia Nitrogen txo mus rau 1.49 mg/L (90.5% tshem tawm, +17.7%); Qhov nruab nrab Tag Nrho Phosphorus txo qis rau 0.19 mg / L (88.9% tshem tawm, +12.7%); Qhov nruab nrab Tag Nrho Nitrogen txo qis rau 10.28 mg / L (57.9% tshem tawm, +16.9%). Lub tshuab hluav taws xob siv hluav taws xob txo qis los ntawm 72.5 kW mus rau 59 kW nyob rau hauv cov xwm txheej zoo sib xws, txuag 18.6% hauv lub zog.
3. Cov lus xaus
Kev tshuaj xyuas tau txheeb xyuas qhov ua rau lub tshuab hluav taws xob puas tsuaj, kev kub siab, kev puas tsuaj rau diffuser, thiab sludge accumulation. Cov phiaj xwm kho dua tshiab rau thaj chaw anoxic thiab oxic tau ua tiav. Kev sim ntsuas tau pom tau tias muaj kev txhim kho tseem ceeb: anoxic DO, oxic DO, blower siab, thiab sludge thickness tau txhim kho los ntawm 1.88, 1.34, 0.13, thiab 0.31, raws li. Qhov no muab lub hauv paus zoo rau tag nrho - nplai kho dua tshiab.