Txav txaj Biofilm Reactor (MBBR) txheej txheem

Cov txheej txheem MBBR yog ib hom kev sib txuas-kev loj hlob. Hauv MBBR reactors, microorganisms raug kho ntawm cov cab cab rau kev tshem tawm carbon thiab / lossis nitrification. Cov khoom siv xov xwm yas yog tsim tshwj xeeb los muab qhov chaw zoo rau kev loj hlob microbial kom ruaj khov thiab ruaj khov, nrog qhov ntom me ntsis qis dua dej.

 

Cov txheej txheem MBBR ua haujlwm nrog aeration tsis tu ncua. Lub hom phiaj ntawm huab cua yog muab cov pa oxygen uas yuav tsum tau muaj los ntawm cov kab mob thiab ua kom muaj kev ncua ntawm cov khoom siv xov xwm.

 

Cov effluent los ntawm lub reactor, nrog rau cov sludge sib tov, yog xa mus rau downstream kho units los yog sedimentation tanks. Ib qho kev faib ua feem ntawm cov sludge tau rov qab mus rau qhov nkag ntawm cov txheej txheem MBBR. Cov ntxaij vab tshaus zoo li qub nrog qhov sib txawv ntawm qhov sib txawv ntawm qhov loj ntawm cov neeg nqa khoom xov xwm yog siv los khaws cov nqa khoom hauv lub reactor, raws li qhia hauv daim duab hauv qab no:

Cov xov xwm txhawb nqa tuaj ua ob hom, raws li qhia hauv daim duab: a. MBBR C, siv rau kev kho cov pa phem carbonaceous; b. MBBR N, feem ntau yog siv rau kev kho nitrification.

Kev kho kom zoo, xws li lub hauv paus daws teeb meem lossis kev tshuaj ntsuam xyuas zoo, yuav tsum tau ua ua ntej tus neeg muaj zog nkag mus rau MBBR reactor.

1. PAB C

MBBR C siv cov khoom siv polyethylene ua cov khoom siv xov xwm ncig nrog txoj kab uas hla ntawm 45mm thiab ntev ntawm 35mm. Qhov tshwj xeeb thaj chaw yog kwv yees li 310m² / m³, thiab qhov sib nrug ntawm qhov screen zoo li qub yog 25mm.

MBBR C yog cov txheej txheem siab-load lom neeg (volumetric load txog 30kg COD / (m³·d)), feem ntau yog siv rau kev kho dej khib nyiab, nrog rau qhov siab tshaj plaws ntawm qhov sib piv ntawm 40 feem pua ​​​​ntawm cov reactor ntim.

Nyob ntawm cov hom phiaj kev kho mob, cov txheej txheem no tuaj yeem siv rau:

① Kev kho ua ntej dej ntws ntawm cov txheej txheem sludge, feem ntau siv hauv cov chaw kho dej khib nyiab kho dua tshiab.

② Secondary sedimentation txheej txheem nyob rau hauv ob-theem kev kho mob los yog flotation txheej txheem rau tej yam dej khib nyiab.

Ob lub tswv yim tau qhia hauv daim duab:

2. MBBR N

MBBR N kuj siv cov khoom siv polyethylene ua cov khoom siv xov xwm ncig, tab sis me dua cov siv hauv MBBR C: txoj kab uas hla ntawm 10 hli thiab ntev ntawm 7 hli. Qhov zoo ntawm thaj chaw tshwj xeeb yog loj dua, kwv yees li 870m² / m³. Qhov sib nrug ntawm qhov screen zoo li qub yog 5 hli.

MBBR N muaj ob daim ntawv thov sib txawv:

① Nitrification cov tshuaj tiv thaiv ntawm cov dej pretreated hauv MBBR reactor, ua raws li cov tshuaj tiv thaiv denitrification hauv thaj chaw anoxic los ntawm kev sib xyaw ua kua recirculation thiab sludge recirculation (hu ua MBBR CN). Cov txheej txheem no zoo ib yam li cov tshuab ua kom cov sludge ib txwm siv rau kev sib xyaw denitrification, nrog rau qhov sib txawv tseem ceeb yog tias lub hnub nyoog qis kawg nkaus tsis yog qhov txwv tsis pub muaj kev txwv rau qhov tsim ntim ntawm cov tso tsheb hlau luam aerobic, uas ua rau txo qis hauv qhov xav tau aerobic tank ntim (txo rau kwv yees li 1/3). Tsis tas li ntawd, vim lub hnub nyoog qis dua sludge thiab ntau haiv neeg ntawm cov kab mob heterotrophic, ntau dua denitrification tuaj yeem ua tiav. MBBR CN yog tshwj xeeb tshaj yog haum rau:

a.Txhim kho cov chaw kho dej khib nyiab yam tsis muaj kev hloov pauv loj: Cov reactors uas twb muaj lawm tuaj yeem muab faib ua ob thaj chaw ywj pheej (anoxic thiab MBBR CN) txhawm rau txhim kho kev pub noj muaj peev xwm ntawm lub tshuab aeration. Kev teeb tsa ntawm cov twj tso kua dej sib xyaw ua ke thiab cov xov xwm-tsim cov ntxaij vab tshaus zoo li tso cai rau kev kho dej khib nyiab uas yog tsim los rau kev tshem tawm cov pa phem tsuas yog ua kom tiav TN cov qauv tawm.

b.Cov chaw kho dej khib nyiab me me nyob rau hauv cov cheeb tsam txias lossis muaj kev hloov pauv raws caij nyoog hauv cov pa phem: Cov kab mob uas txuas nrog rau cov neeg nqa khoom kom muaj kev pib sai sai tom qab kaw thiab tswj cov nitrification txawm tias nyob rau hauv qhov kub thiab txias.

② Sib sib zog nqus nitrification kev kho mob yog siv rau cov effluent los ntawm kev kho mob thib ob, ua raws li cov kua-kua sib cais (MBBR N). Lub hom phiaj tseem ceeb yog tshem tawm ammonia nitrogen los yog ua tau raws li TKN (Tag nrho Kjeldahl Nitrogen) cov qauv tso tawm. Cov txheej txheem MBBR N kuj tseem tsim nyog rau cov dej khib nyiab siab ammonia nitrogen, xws li kev kho nitrification ntawm cov sludge rov qab los ntawm lub tank nitrification.

Ob daim ntawv thov schemes tau piav qhia hauv daim duab hauv qab no:

3.Qhov zoo thiab qhov tsis zoo

Cov txheej txheem MBBR muaj cov txiaj ntsig tseem ceeb hauv qab no:

① Kev tshem tawm sai thiab ua tau zoo ntawm cov pa phem carbonaceous [muaj peev xwm ntim tau txog li 30kg COD/(m³·d)] thiab ammonia nitrogen [volumetric load txog li 0.6kg NH ntxiv rau 4-N/ (m³·d)].

② Kev txo qis hauv reactor ntim.

③ Kev ua haujlwm ruaj khov nrog kev muaj zog tiv thaiv kev poob siab.

④ Tsim nyog rau kev kho dej khib nyiab cog kev txhim kho thiab nthuav dav.

Txawm li cas los xij, cov txheej txheem MBBR muaj qhov tsis zoo hauv qab no:

① Nws yuav nyuaj kom ua tiav kev tshem tawm tag nrho cov nitrogen rau cov dej khib nyiab nrog qis BOD / TKN piv thiab siab TKN concentration.

② Qhov xwm txheej ntawm cov sludge seem tsim nyob rau hauv nruab nrab-load biochemical kev kho cov txheej txheem yuav tsis ruaj khov.