Ua ntej-Anaerobic Micro-Pore Aeration Oxidation Ditch: Advanced Nutrient Removal Technology

Kev kho dej phwj Technology ntawm Pre-anaerobic Micro-pore Aeration Oxidation Ditch

Taw qhia

Analysis ntawmPa oxidation ditch txheej txheemqhia tau hais tias los ntawm kev kho thiab optimizing aeration siv thiab cov qauv ntws, cov dej khib nyiab tau kho raws li hauv qab no los ntawm anaerobic, anoxic, thiab aerobic cov tshuaj tiv thaiv tso tsheb hlau luam, ua kom muaj txiaj ntsig zoo tshem tawm cov organic teeb meem. Txawm li cas los xij, cov teeb meem xws lisiab tag nrho kev nqis peevthiabqis oxygen hloov efficiencymuaj ntau, ua rausuboptimal nitrogen thiab phosphorus tshem tawm. Txhawm rau daws cov kev txwv no, hauv - kev tshawb fawb tob txog ua ntej -anoxic microporous aeration oxidation ditch dej khib nyiab kho tshuab tau ua, txhawm rau txhim kho kev ua haujlwm ntawm cov dej khib nyiab hauv nroog thiab txhim kho kev siv dej.

1. Qhov project Overview

Lub chaw kho dej khib nyiab hauv X City feem ntau kho cov dej phwj hauv tsev thiab cov dej khib nyiab, nrog rau qhov ntim tseem ceeb ntawm cov dej phwj tuaj.Lub peev xwm kho tau tsim yog 10 × 10⁴ m³ / d. Cov qauv zoo rau kev muaj peev xwm thiab cov dej ntws tawm tau qhia hauvTable 1. Tam sim no, 30% ntawm cov khoom siv kho mob tau rov qab siv dua li cov dej rov qab rau cov chaw tsim hluav taws xob thermal, hos 70% ntxiv yog tawm mus rau cov dej ntws. Raws li cov kev faib dej ntawm cov dej saum npoo av thiab cov qauv pov tseg pov tseg rau hauv nroog pov tseg cov nroj tsuag, cov nroj tsuag yuav tsum ua tau raws li Qib 1B tus qauv tso tawm. Nrog kev txhim kho hauv nroog tsis tu ncua thiab nce cov dej pov tseg, cov nroj tsuag tau siv cov dej phwj cuam tshuam rau cov dej khib nyiab hauv tsev, nthuav dav cov kav dej phwj tuaj, thiab tau txais cov txheej txheem ua ntej - anoxic microporous aeration oxidation ditch txheej txheem los txo cov pa phem ntawm cov dej hauv nroog.

2. Txheej txheem ntws ntawm Pre-Anoxic Microporous Aeration Oxidation Ditch

Lub hauv paus ntawm cov txheej txheem no yog kev sib xyaw ua ke ntawm lub tank ua ntej - anoxic tank thiab microporous aeration oxidation ditch. Txoj kev kho mob yog raws li nram no:Cov dej khib nyiab → coarse screen → inlet twj tso kua mis tsev → zoo screen → vortex grit chamber → anaerobic tank → anoxic / aerobic aav → theem nrab sedimentation tank → disinfection tank → effluent. Ib feem ntawm cov sludge los ntawm cov sedimentation tank thib ob yog tawm mus rau qhov chaw sludge dewatering ua ntej pov tseg zaum kawg. Cov txheej txheem tsom mus rau phosphorus tso tawm, tshem tawm cov nitrogen lom, thiab tshem tawm phosphorus.

2.1 Phosphorus tso tawm

Hauv lub tank anaerobic, cov kab mob fermentative hloov biodegradable macromolecules rau hauv me me molecular intermediates, feem ntau volatile fatty acids (VFAs). Nyob rau hauv cov mob anaerobic ntev, polyphosphate- cov kab mob sib sau ua ke (PAOs) loj hlob qeeb thiab tso cov phosphate los ntawm lawv lub hlwb mus rau hauv cov tshuaj los ntawm kev rhuav tshem polyphosphates. Cov txheej txheem no muab lub zog rau kev txhawb nqa thiab hloov pauv ntawm qis- cov roj molecular fatty acids rau hauv polyhydroxybutyrate (PHB) granules.

2.2 Kev tshem tawm Biological Nitrogen

Ammonia nitrogen hloov mus rau nitrite thiab nitrate los ntawm nitrifying kab mob nyob rau hauv aerobic tej yam kev mob. Hauv thaj chaw anoxic, cov kab mob denitrifying txo cov nitrate rau nitrogen gas, uas tso tawm rau hauv qhov chaw. Cov txheej txheem no zoo txo ​​cov qib nitrogen hauv cov dej khib nyiab.

2.3 Phosphorus tshem tawm

Nyob rau hauv aerobic tej yam kev mob, PAOs siv cov pa roj carbon thiab PHB los nqus orthophosphate, synthesizing polyphosphates hauv lawv lub hlwb. Tom qab ntawd cov phosphorus ntau ntxiv tau raug tshem tawm los ntawm qhov system nrog cov khib nyiab sludge, ua tiav kev tshem tawm phosphorus zoo.

Piv nrog rau cov txheej txheem pa,lub pre-anoxic microporous aeration oxidation ditch ua haujlwm yooj yim los ntawm kev tshem tawm thawj cov sedimentation lossis txo nws lub sijhawm. Qhov no tso cai rau cov organic loj dua los ntawm cov grit chamber nkag mus rau hauv cov kab mob lom neeg, hais txog cov pa roj carbon deficiencies. Qhov hloov pauv anaerobic-anoxic-aerobic tej yam kev mob inhibit filamentous kab mob loj hlob, txhim kho sludge settleability, thiab integrate nitrogen tshem tawm, phosphorus tshem tawm, thiab organic degradation. Cov cheeb tsam anaerobic thiab anoxic tsim ib puag ncig zoo rau kev tshem tawm nitrogen thiab phosphorus, thaum thaj chaw aerobic txhawb nqa ib txhij phosphorus tso tawm thiab nitrification. Lub ntim ntawm aerobic cheeb tsam yuav tsum tau ua tib zoo xam los xyuas kom meej efficiency:

Qhov twg:

• XMicrobial sludge concentration (mg / L)
• YSludge yield coefficient (kgMLSS / kgBOD)
• S_e: Cov kua dej concentration (mg / L)
• S₀: Influent concentration (mg / L)
• θ_C0: Hydraulic tuav lub sij hawm (s)
• QKev khiav hauj lwm tus nqi (L / s)
• V₀Yav dhau los: Qhov ntim ntawm aerobic reactor (L)

3. Yam tseem ceeb ntawm Pre-Anoxic Microporous Aeration Oxidation Ditch Technology

3.1 Pre-Anoxic Tank Technology

Lub pre-anoxic tank hosts cov kab mob anaerobic uas ua ntej decompose thiab hloov cov organic teeb meem, txo cov sludge ntau lawm thiab alleviating load rau tom ntej kev kho mob theem.

3.1.1 Txheej txheem Flow

3.1.1.1 Influent Pretreatment

Kev tshuaj xyuas tshem tawm cov khib nyiab xws li yas, plaub hau, thiab cov khib nyiab hauv chav ua noj uas siv cov ntxaij vab tshaus lom. Kev khiav dej num thiab kev tswj xyuas zoo ua kom muaj kev sib haum xeeb, thaum sedimentation (natural los yog chemical- pab) tshem tawm cov khib nyiab thiab cov organic / inorganic teeb meem.

3.1.1.2 Anaerobic Reaction

Kev tswj qhov kub thiab txias, pH, thiab lub sijhawm khaws cia ua kom yooj yim sib xyaw ntawm anaerobic sludge thiab dej khib nyiab, txhim kho kev tshem tawm cov organic. Anaerobic reactors siv kev sib xyaw lossis kev ncig los txhawb kev fermentation, tsim CO₂, CH₄, thiab kab ntawm H₂S. Gas-kua-kev sib cais thiab kev kho roj ua raws li.

3.1.1.3 Tshaj tawm -Kev kho mob thiab cov dej ntws tawm

Resistant inorganic thiab organic pollutants raug kho los ntawm cov txheej txheem aerobic lossis activated carbon adsorption. Kev soj ntsuam online taug qab cov dej num microbial thiab ntsuas dej zoo (piv txwv li, F / M piv, yaj oxygen). F / M piv yuav tsum nruab nrab 0.06; Cov pa oxygen yaj hauv thaj chaw anaerobic yuav tsum yog 0.5-1 mg / L.

3.1.2 Txheej txheem tswj

Cov kev ntsuas tseem ceeb suav nrog:

Kev cog qoob loo anaerobic sludge nrog lub peev xwm degradation siab thiab tswj cov khoom noj kom zoo (C: N:P ≈ 100: 5: 1).

Tswj cov organic load, kub (30-35 degree), thiab pH (6.5-7.5). Organic load yuav tsum yog 3-6 kgBOD₅ / (m³·d).

Siv cov sludge recycling los tswj cov microbial concentration thiab kev ua ub no. Dewatered sludge yuav repurposed li chiv los yog pub.

3.2 Microporous Aeration Oxidation Ditch Technology

Sludge bulging, feem ntau tshwm sim los ntawm cov kab mob filamentous los yog zoogloea expansion, impairs settleability. Cov kab zauv hauv qab no piav qhia txog kev loj hlob ntawm microbial:

Qhov twg:

• K_d: Microbial decay coefficient (d^-1)
• S: Substrate concentration (mg / L)
• K_s​: Ib nrab -saturation coefficient (mg/L)
• Y: Yield coefficient (kgMLSS / kgCOD)
• μ_max: Kev loj hlob tshwj xeeb tshaj plaws (d^-1)
• μ: Kev loj hlob ntawm microbial (d^-1)
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Qhov twg:

• S_min: Yam tsawg kawg nkaus substrate concentration ntawm khov kho (mg / L)
• K_d: Microbial decay coefficient (d^-1)
• Ks: Ib nrab -saturation coefficient, piv txwv li, lub substrate concentration thaum μ=μmax/2μ=μmax / 2 (mg / L)
• Y: Yield coefficient (kgMLSS / kgCOD)
• μ_max: Kev loj hlob tshwj xeeb tshaj plaws (d^-1)

3.2.1 Cov Txheej Txheem Tsim Cov Txheej Txheem

Cov dej khib nyiab dhau los ntawm cov ntxaij vab tshaus, grit chambers, thiab cov tso tsheb hlau luam anaerobic (nrog cov khoom sib xyaw) ua ntej nkag mus rau hauv qhov dej oxidation. Microporous aerators thiab submerged propellers tsim alternating aerobic / anoxic mob. Lub kaw lus suav nrog ob lub tso tsheb hlau luam anaerobic (2.8h HRT) thiab plaub oxidation ditches (8.64h HRT). Sludge hnub nyoog yog 11.3 hnub.

3.2.2 Pilot-Sale Device Design

Lub tshuab tsav muaj xws li aerated grit chamber, twj tso kua mis, anaerobic selector, oxidation ditch, sludge Reflux twj tso kua mis, theem nrab settler, thiab effluent twj tso kua mis. Lub anaerobic selector (2.35 m³) muaj peb qhov sib xyaw nrog cov khoom sib xyaw thiab saib (ORP, pH). Lub oxidation ditch (26.3 m³) nta ntau yam inlets / outlets thiab microporous diffusers. Kev kuaj pom muaj qhov nruab nrab zoo: SS 160 mg / L, COD 448 mg / L, TP 4 mg / L.

Xaus

Kev koom ua ke ntawm pre-anoxic thiab microporous aeration oxidation ditch thev naus laus zis ua kom zoo dua nitrogen thiab phosphorus tshem tawm. Cov kev siv zog yav tom ntej yuav tsum tsom optimizing sludge hnub nyoog, yaj oxygen, thiab sludge reflux piv rau ntxiv txhim kho kev kho mob.