MBBR Tsim & Xam rau RAS

Kev Tsim Nyog Rau Biofilters hauv RAS

Ib qho zoo tshaj plaws biofilter rau siab - ntom RAS yuav tsum ua kom tiav ntau yam tseem ceeb los xyuas kom meej tias kev ua haujlwm tau zoo thiab ruaj khov. Lub kaw lus yuav tsum siv tag nrho cov xov xwm thaj chaw kom ua tiavua kom tiav ammonia tshem tawmthaumminimizing nitrite tsub zuj zuj. Kev hloov pauv cov pa oxygen zoo tshaj plaws yuav tsum tau khaws cia nyob rau hauv ib qho kev cog lus me me, siv tus nqi - cov xov xwm zoo uas ua rau lub taub hau poob tsawg. Tus qauv tsim yuav tsum tau saib xyuas me ntsis thiab tsis txhob khaws cia kom tsis txhob muaj teeb meem clogging.

Ib qho nyuaj tshaj plaws ntawm kev tsim biofilter suav nrogyog xam cov pa oxygen xav taukom ua tau raws li ob qho tib si kab lis kev cai cov cai thiab biofilter cov kev xav tau ua haujlwm. Thaum cov kev suav stoichiometric qhiaqhov theoretical yam tsawg kawg nkaus ntawm 0.37 kg yaj oxygen ib kg pub(nrog 0.25 g txhawb cov ntses metabolism thiab 0.12 g rau nitrification),Cov tswv yim tsim kev xav pom zoo kom muab 1.0 kg O₂ ib kg pubkom ntseeg tau qhov system. Cov ntaub ntawv teb los ntawm kev lag luam - teev cov haujlwm qhia txog qhovKev siv cov pa oxygen zoo tshaj plaws feem ntau tshwm sim ntawm kwv yees li 0.5 kg O₂ ib kg pub, sawv cev rau qhov zoo tshaj qhov sib npaug ntawm kev ua haujlwm lom neeg thiab lub zog ua haujlwm.

Qhov nooxygen muab tswv yimyuav tsum suav rau ntau yam xws li:

Biofilter's ammonia oxidation muaj peev xwm

Stocking density fluctuations

Kub -nyob ntawm oxygen solubility

System redundancy xav tau

MBBR Technology thiab Nws Qhov Zoo

Lub Moving Bed Biofilm Reactor (MBBR) system muaj cov txiaj ntsig tseem ceeb ntawm cov txheej txheem biofiltration ib txwm muaj xws li cov lim lim thiab tig cov kab mob lom neeg, tshwj xeeb tshaj yog hais txog kev ua haujlwm thiab kev saib xyuas.Tam sim no, MBBR thev naus laus zis tau siv dav hauv European cov chaw kho dej khib nyiab thiab kev lag luam aquaculture systems ntawm ntau qhov ntsuas.

MBBR sawv cev rau ib qho txuas nrog - kev loj hlob ntawm kev kho mob lom uas ua haujlwm tsis tu ncua raws li aqis -headloss, tsis yog -clogging biofilm reactor. Qhov no system ntasiab tshwj xeeb thaj tsamrau biofilm kev loj hlob yam tsis tas yuav rov qab ntxuav. Hauv MBBR cov kab ke, kab lis kev cai kab mob loj hlob ntawm cov khoom tshwj xeeb tshaj tawm uas txav mus los hauv lub ntim ntawm lub reactor. Lub reactor configuration tuaj yeem tswj tau ob qho xwm txheej aerobic rau nitrification los ntawm diffused aeration lossis anoxic mob rau denitrification siv submerged mechanical mixers.

Cov khoom siv xov xwm feem ntauoccupies 50-70% ntawm lub reactor ntim, raws li qhov sib piv ntau dua tuaj yeem cuam tshuam kev sib xyaw kom zoo. Cov ntxaij vab tshaus tuav - suav nrog ntsug bar racks, cov ntxaij vab tshaus mesh, lossis cylindrical sieve npaj - tiv thaiv kev poob tawm thaum tso dej ntws. Cov khoom siv uas siv ntau tshaj plaws (MBBR04/K1 hom) muaj siab -polyethylene ntom ntom (density 0.95 g/cm³) tsim rau hauv cov thooj voos kheej kheej me me nrog cov qauv ntoo khaub lig thiab sab nraud fin- zoo li protrusions. Thaum muaj ntau yam kev tshaj tawm tsim tawm, txhua tus qhia cov yam ntxwv tseem ceeb ntawm kev muab thaj chaw tiv thaiv rau kev txhim kho biofilm. Kev tawm mus tas li nyob rau hauv lub reactor tsim ib tus kheej - ntxuav cov nyhuv uas tiv thaiv clogging thiab txhawb kev tswj biofilm sloughing. Raws li txuas nrog- txheej txheem kev loj hlob,MBBR kev kho muaj peev xwm ncaj qha cuam tshuam nrog tag nrho cov chaw muaj xov xwm.

Cov yam ntxwv tseem ceeb ntawm kev ua haujlwm:

Case Study Design thiab xam

Txheej txheem cej luam

Qhov qauv tsim no qhia txog MBBR biofilter sizing rau 500-tuj txhua xyoo RAS. Cov khoom tseem ceeb ntawm txhua theem kab lis kev cai muaj nyob rau hauv Cov Lus 1-1 thiab 1-2.

Tsim Methodology

MBBR tsim ua raws li ib txoj hauv kev yooj yim thaum TAN (Tag nrho Ammonia Nitrogen) tshem tawm kev ua haujlwm tau paub, raws li:

• Tsau reactor ntim
• Media yam ntxwv
• Hydraulic loading
• TAN tshem tawm tus nqi
• Ua haujlwm kub

Qhov xav tau tag nrho biofilm thaj chaw (A_{xov xwm}, m²) yog xam los ntawm:

1. MBBR TAN loading tus nqi (P_TANkg / hnub)
2. Kwv yees tus nqi nitrification (r_TAN,g / (m² · hnub)

Bioreactor Volume (V_{xov xwm}, m³) ces txiav txim los ntawm:

V_{xov xwm} = A_{xov xwm}/SSA

qhov twg SSA=thaj chaw tshwj xeeb ntawm cov xov xwm (m²/m³)

Reactor geometry yog optimized raws qhov siab - rau - txoj kab uas hla (H/D) ratios.

Tsim txheej txheem

Kauj Ruam 1: Xam Oxygen Demand (R_DO)

Qhov twg:

• a_DO= 0.25 kg O₂/kg pub
• r_pub= 0.0173 kg pub/kg ntses/hnub
• ρ= ceev ceev (137 kg/m³)
• V_tank= tank ntim (72.8 m³)

Kauj Ruam 2: Txiav txim siab dej ntws (Q_tank)

Xav tias:

DO_nkag= 14.2 mg/L (50% O₂ saturation)

DO_tank= 5 mg/L (28 degree)

Qhov twg

• Q_tank= 3, 250 L/min

Tshawb xyuas seb tus nqi pauv hloov pauv ib teev twg ua tau raws li qhov yuav tsum tau tshem tawm cov khib nyiab zoo:

Yog tias tsim nyog, nws tuaj yeem txo qis (piv txwv li, mus rau 2 kev sib pauv / teev), nyob ntawm lub tank hydraulics thiab cov khib nyiab tshem tawm efficiency.

Kauj Ruam 3: Xam TAN Production (P_TAN)

Qhov twg

• R_pub= 170 kg pub/hnub
• a_TAN= 0.032 kg TAN/kg pub
• P_TAN= 5.44 kg TAN/hnub

Kauj ruam 4: Txiav txim siab Media Volume

Siv volumetric TAN tshem tawm tus nqi (VTR):

• Dej sov (25-30 degree): 605 g / m³ / hnub
• Cov dej txias (12-15 degree): 468 g / m³ / hnub (ntawm 1-2 mg / L TAN)

Kauj ruam 5: Loj Bioreactor

Cov ntsiab lus tseem ceeb:

• H / D piv: 1.0-1.2 (zoo rau kev sib xyaw / aeration)
• Max txoj kab uas hla: Tsawg dua los yog sib npaug li 2 m
• Media sau piv: 60-70%

Rau qhov no:

• Yuav tsum ntim: 5.0 m³ ntawm 60% sau
• Qhov Loj:

- Qhov siab: 1.83 m

- Txoj kab uas hla: 1.83 m

- Tag nrho qhov siab: 2.1 m (nrog rau lub freeboard)

Tau txais MBBR Tsim & suav rau koj RAS

Xa lus nug tam sim no