MBBR Startup Guide: Kws Tshaj Lij Biofilm Cultivation Protocols For Wastewater Treatment

MBBR Biofilm Kev cog qoob loo: Cov Kws Tshaj Lij Tshaj Lij rau kev pib sai thiab kev ua haujlwm ruaj khov

Nrog rau ntau tshaj 20 xyoo ntawm kev ua haujlwm biofilm reactors thoob plaws plaub lub teb chaws, kuv tau txheeb xyuas tias lub sijhawm tseem ceeb tshaj plaws ntawm MBBR kev teeb tsa yog thawj zaug biofilm cog qoob loo. Kev pib tsim nyog hloov pauv cov ntaub ntawv yas tsis zoo rau hauv lub siab -kev ua haujlwm lom tshuaj lom neeg lub cav, thaum txoj hauv kev nrawm lossis tsis raug ua rau muaj kev ua haujlwm tsis zoo, ua kom cov kua dej ammonia nce siab, thiab lub hlis ntawm kev kho cov teeb meem. Qhov sib txawv ntawm kev vam meej thiab tsis ua haujlwm yog nyob rau hauv kev paub txog qhov sib npaug ntawm microbial ecology, hydrodynamics, thiab kev tswj cov txheej txheem nyob rau hauv thawj lub lis piam tseem ceeb. Cov lus qhia dav dav no qhia meej txog cov ntsiab cai ntawm kev tshawb fawb thiab ua pov thawj, kauj ruam -los ntawm- cov txheej txheem kev ua tiav kom ua tiav cov txheej txheem biofilm muaj zog hauv lub sijhawm sau tseg, kom ntseeg tau tias koj MBBR muaj peev xwm kho tau zoo txij hnub ib.

Kev pib ntawm MBBR yog qhov sib txawv los ntawm kev ua kom muaj kev loj hlob raug tshem tawm xws li qhib cov sludge. Hloov chaw cog qoob loo pub dawb- ntab flocs, peb yuav tsum txhawb nqa kev sib txuas thiab kev loj hlob ntawm cov zej zog microbial complex ntawm cov khoom siv hluavtaws. Cov txheej txheem no, hu ua bioaugmentation thiab acclimatization, yuav tsum muaj txoj hauv kev los daws cov teeb meem tshwj xeeb ntawm kev colonization saum npoo, suav nrog kev ua kom lub zog pib, kev tawm dag zog, thiab kev tiv thaiv los ntawm shear rog. Ib txoj kev pib tsis yog tsuas yog ua kom cov txheej txheem nrawm xwb tab sis kuj tsim kom muaj kev noj qab haus huv, zoo dua biofilm uas tuaj yeem tiv thaiv kev ua haujlwm tsis zoo.

I. Kev Tshawb Fawb Txog Kev Tsim Kho Biofilm: Plaub -Cov Txheej Txheem

Nkag siab txog cov txheej xwm lom neeg ntawm cov xwm txheej yog qhov tseem ceeb rau kev cuam tshuam zoo thiab kev daws teeb meem. Biofilm kev loj hlob tshwm sim nyob rau hauv plaub theem sib law liag:

1. Conditioning Film Formation (feeb rau teev):Tam sim ntawd thaum immersion, pristine hydrophobic yas media nto yog coated los ntawm ib txheej ntawm cov organic molecules (proteins, polysaccharides) nyob rau hauv cov dej khib nyiab. Cov zaj duab xis txias no hloov cov nqi saum npoo thiab lub zog, ua rau nws zoo siab rau cov kab mob txuas ntxiv.
2. Reversible Attachment (Thawj 24-72 Teev):Cov kab mob Pioneer, feem ntau yog hom kab mob, raug thauj mus rau qhov chaw tshaj xov xwm los ntawm kev nthuav dav thiab hydrodynamic rog. Lawv ua raws li tsis muaj zog los ntawm van der Waals rog thiab kev sib cuam tshuam electrostatic. Daim ntawv txuas no yogthim rov qab; cov hlwb tuaj yeem yooj yim tshem tawm vim cov kua dej shear.
3. Irreversible Attachment & Microcolony Formation (Hnub 3-7):Cov hlwb uas txuas nrog pib tsim cov nplaum nplaum extracellular polymeric tshuaj (EPS), feem ntau polysaccharides thiab cov proteins. Qhov no EPS matrix ua raws li "cov kua nplaum lom," ua kom cov hlwb rau saum npoo thiab sib luag, hloov qhov txuas mus raurov qab tsis tau. Cells proliferate, tsim microcolonies uas tiv thaiv hauv EPS.
4. Biofilm Maturation & Succession (Lub Limtiam 2-4):Cov qauv biofilm matures thiab diversifies. Fast-cov kab mob heterotrophic loj hlob (BOD tshem tawm) pib pib. Maj mam- loj hlob autotrophic nitrifiers (Nitrosomonas, Nitrobacter) tom qab colonize qhov tob, oxygen-limited txheej ntawm biofilm. Qhov sib npaug ntawm qhov sib npaug yog thaum kawg mus txog ntawm cov kab mob loj hlob thiab cov shear rog sloughing tawm ntau biomass.

II. Ua ntej-Startup Checklist: Yam yuavtsum tau kawm uantej rau kev ua tiav

Tsis quav ntsej cov kauj ruam npaj no yog thawj qhov ua rau pib ua tsis tiav.

1. Media Inspection & Loading:Xyuas kom tseeb tias qhov tseeb kom muaj nuj nqis thiab hom xov xwm tau raug thauj mus rau hauv lub reactor. Xyuas kom meej qhov sib piv yog ib qho tsim (feem ntau 40-70% ntawm lub tank ntim). Cov xov xwm yuav tsum huv thiab tsis muaj cov txheej txheem tiv thaiv lossis cov tshuaj tiv thaiv.
2. Aeration/Mixing System Calibration:Qhov no tsis yog -negotiable. Paub meej tias huab cua diffusers lossis cov khoom sib xyaw ua ke raug teeb tsa kom raug thiab muabuniform kev faib tawmntawm lub zog thoob plaws lub tank pem teb. Kev sib xyaw tsis txaus ua rau muaj kev sib tham hauv xov xwm thiab thaj chaw tuag; ntau shear strips deb nascent biofilms.
3. Inoculum Strategy:Ruaj ntseg ib qhov chaw siv tau, yoog raws biomass. Qhov kev xaiv zoo tshaj plaws yog qhib cov sludge (2,000-3,000 mg / L MLSS) los ntawm cov chaw kho mob hauv nroog noj qab haus huv uas kho cov dej khib nyiab zoo sib xws. Raws li txoj cai ntawm tus ntiv tes xoo, inoculate nrog lub ntim sib npaug5-10%ntawm MBBR reactor ntim.
4. Nutrient Balance:Xyuas tias cov dej khib nyiab muaj cov as-ham txaus rau kev loj hlob microbial. Tus qauv BOD:N:P piv yuav tsum yog100:5:1. Khoom noj khoom haus- tsis muaj dej khib nyiab (piv txwv li, qee qhov kev lag luam kwj dej) yuav xav tau ntxiv nrog ammonium chloride thiab phosphoric acid.
5. Analytical Readiness:Kom koj lub chaw kuaj mob npaj ua txhua hnub saib xyuas cov tsis tseem ceeb:Ammonia, Nitrite, Nitrate, pH, Alkalinity, thiab Dissolved Oxygen.

III. Ob txoj hauv kev pib pib thawj zaug: Kev Tshawb Fawb Sib Piv

Muaj ob txoj hauv kev tseem ceeb rau MBBR pib, txhua qhov muaj qhov zoo sib xws thiab kev siv.

IV. Kauj Ruam -los ntawm - Cov Txheej Txheem Txheej Txheem rau Kev Pov Hwm Hauv -Situ Startup

Rau feem ntau cov ntawv thov txheej txheem, hauv -situ txoj kev ua tau zoo thiab kev lag luam. Ua raws li cov txheej txheem ntxaws ntxaws no:

Theem 1: Pib Seeding thiab Acclimatization (Hnub 1-3)

• Kauj ruam 1:Sau lub MBBR reactor nrog dej khib nyiab. Txo cov khoom ntws mus rau ib qho trickle lossis siv batch hom.
• Kauj ruam 2:Qhia cov activated sludge inoculum (5-10% reactor ntim).
• Kauj ruam 3:Pib aeration / sib tov. Teem Dissolved Oxygen (DO) rau2.0-3.0 mg / L. Tsis txhob siab DO thaum xub thawj, vim nws tuaj yeem txhawb nqa kev loj hlob ntau dhau los ntawm kev sib txuas.
• Kauj Ruam 4:Tswj pH nruab nrab7.0-7.8. Nitrification siv alkalinity. Muaj cov khoom noj ntawm sodium bicarbonate lossis magnesium hydroxide ntawm tes los txhawb alkalinity yog tias nws poob qis dua 50 mg / L.
• Kauj ruam 5:Saib xyuas ammonia. Tsis txhob cia siab tias yuav tshem tawm.

Theem 2: Biofilm Loj hlob thiab Ammonia poob qis (Hnub 4-14)

• Kauj Ruam 6:Maj mam nce qhov nkag mus rau qhov tsim hydraulic loading tus nqi tshaj 5-7 hnub.
• Kauj Ruam 7:Koj yuav pom ib qho classic "nitrogen spike": Ammonia yuav ua ntej lub ncov thiab tom qab ntawd pib poob qis. Qhov no yog ua raws li ib tug spike nyob rau hauvnitrite, qhia txog kev tsim ntawmNitrosomonas. Qhov no nitrite spike yog ib qho cim zoo.
• Kauj Ruam 8:Thaum nitrite nce, nce DO mus rau3.0-4.0 mg / Llos txhawb qhov qeeb - loj hlobNitrobacteruas hloov nitrite rau nitrate.

Theem 3: Nitrification Tsim thiab ruaj khov (Hnub 15-30+)

• Kauj Ruam 9:Cov nitrite concentration yuav ncov thiab ces poob raws li cov pejxeem ntawmNitrobacterntes tau. Ib txhij muaj cov ammonia tsawg thiab tsawg nitrite qhia tias tag nrho nitrification tiav.
• Kauj ruam 10:Maj mam nce cov organic loading kom tsim muaj peev xwm. Lub heterotrophic biomass ntawm cov xov xwm tam sim no txaus los tuav BOD load.

V. Advanced Tips for Troubleshooting and Optimization

• Stalled Startup?Yog tias kev tshem tawm ammonia tsis pib tom qab ob lub lis piam, feem ntau ua rau yog:qis alkalinity (<50 mg/L as CaCO3), kub kub (<15°C), or tshuaj lom inhibition. Ntsuam xyuas cov hlau hnyav lossis cov organic inhibitors.
• Txhawb nqa Attachment:Qee qhov kev tshawb fawb qhia txog lub sijhawm luv luv, tswj tau ntawmqis DO (<1.0 mg/L)rau 12-24 teev tuaj yeem txhawb EPS ntau lawm thiab ntxiv dag zog rau thawj zaug txuas. Siv ceev faj thiab saib xyuas kom zoo.
• Qhov "Touch Test":Tom qab 10-14 hnub, retrieve ob peb daim ntawv xov xwm. Ib tug smooth, slippery xav hais tias ib tug noj qab nyob zoo, nyias biofilm. Ib qho tuab, fuzzy, los yog gritty xav qhia tias kev loj hlob tsis sib npaug los yog inorganic scaling.
• Kev siab ntev yog qhov tseem ceeb:Tsis txhob hnov ​​​​qab txhua qhov hloov pauv me me hauv ammonia lossis nitrite. Lub kaw lus xav tau sijhawm los nrhiav nws cov khoom sib npaug. Tshaj - kho DO los yog ntws tus nqi yuav tsuas yog ncua lub sij hawm acclimatization.

Xaus: Peev Sijhawm rau Ntev -Lub Sijhawm Ua Haujlwm

Kev pib MBBR tsis yog txheej txheem yuav tsum tau rushed. Ua tib zoo ua tiav 4- lub lis piam cog qoob loo, tsim los ntawm cov qauv zoo microbiological, yuav ua rau muaj zog thiab siab -kev ua haujlwm biofilm uas ua raws li kev ua raws li cov xyoo tom ntej. Los ntawm kev xaiv txoj kev tsim nyog, ua tib zoo npaj, thiab ua siab ntev coj lub zej zog microbial los ntawm nws cov theem tsim, koj nteg lub hauv paus rau kev ua tiav qhov kawg ntawm koj cov cuab yeej kho dej khib nyiab. Nco ntsoov, nyob rau hauv lub ntiaj teb ntawm biofilms, lub sij hawm ua lag luam ua ntej yog them rov qab ntau dua hauv kev ua haujlwm ruaj khov thiab txo cov nqi mus sij hawm ntev.