Catalytic Micro-Electrolysis Technology Rau Kev Kho Dej Wastewater

Nrog rau kev ua lag luam nrawm nrawm, siab - concentration, recalcitrant khib nyiab tawm los ntawm kev lag luam xws li dyeing, tshuaj, thiab tshuaj tau dhau los ua qhov teeb meem tseem ceeb ntawm ib puag ncig. Cov txheej txheem tshuaj lom neeg niaj hnub tsis muaj txiaj ntsig rau cov dej khib nyiab thiab chromatic, thaum cov thev naus laus zis oxidation siab heev ntsib lub fwj ntawm cov nqi siab. Hlau-carbon micro-electrolysis (Fe/C Micro-Electrolysis), raws li ntsuab thiab qis-siv cov txheej txheem physicochemical pretreatment, txhim kho cov biodegradability ntawm cov dej khib nyiab thiab ua kom muaj kuab paug zoo los ntawm kev sib koom ua ke ntawm electrochemical oxidation technology tseem ceeb hauv kev lag luam oxidation{7 kev kho mob.

Hauv xyoo 1970, hlau-carbon micro-electrolysis thev naus laus zis tau siv thawj zaug rau kev kho dej khib nyiab. Vim tias micro-electrolysis thev naus laus zis ua raws li kev tiv thaiv ib puag ncig lub tswv yim ntawm "kev kho cov khoom pov tseg," muaj tus nqi siab -kev ua tau zoo, thiab cov txiaj ntsig kho tau zoo, tam sim no nws tau dav siv los kho ntau hom dej khib nyiab. Cov txheej txheem tshuaj tiv thaiv rau kev tshem tawm cov pa phem los ntawm hlau-carbon micro-electrolysis thev naus laus zis tau qhia hauv daim duab 4, feem ntau suav nrog oxidation- txo cov tshuaj tiv thaiv, flocculation thiab adsorption, electrochemical enrichment, thiab lub cev adsorption.

1) Oxidation -Kev txo qis

Iron-carbon micro-electrolysis thev naus laus zis tso hlau (anode) thiab carbon (cathode) hauv cov dej khib nyiab los tsim cov galvanic cell, tsim cov oxidizing thiab txo cov tshuaj kom degrade cov pa phem hauv cov dej khib nyiab. Lub peev xwm electrode ntawm hlau anode, E (Fe / Fe2+), yog -0.44V, tsim kom muaj qhov sib txawv ntawm 1.2V nrog cov pa roj carbon cathode, tso cai rau cov tshuaj tiv thaiv electrode tshwm sim ntawm ob lub electrodes.

2) Flocculation thiab adsorption.

Thaum lub sij hawm micro-electrolysis cov tshuaj tiv thaiv, cov hlau anode corrodes los tsim cov hlau ions. Nyob rau hauv cov xwm txheej alkaline, cov hlau ions tsim hydroxide flocs nrog thaj chaw loj tshwj xeeb, uas tuaj yeem nqus cov organic teeb meem sai sai thiab tshem tawm cov organic hauv cov dej khib nyiab. Thaum cov floc ntom ntom ntau dua li cov dej khib nyiab, cov khoom sib cais - kua tuaj yeem ua tiav los ntawm aeration, flotation, lossis sedimentation.

3) Electrochemical Enrichment.

Thaum lub sij hawm micro-electrolysis txheej txheem, electrode tshwm sim ntawm anode thiab cathode, tsim kom muaj hluav taws xob ruaj khov ntawm lawv. Cov khoom siv hluav taws xob thiab cov colloids hauv cov dej khib nyiab txav raws li lub hauv paus ntsiab lus ntawm cov nqi sib txawv uas nyiam nyob rau hauv electrostatic attraction, ua rau electrophoresis. Thaum kawg, cov khoom them nqi thiab cov colloids sib sau ua ke ntawm cov electrodes, ua tiav kev tshem tawm cov khoom siv los ntawm cov dej los ntawm kev sib sau electrochemical.

4) Lub cev adsorption.

Tam sim no, activated carbon (AC) feem ntau yog siv los ua cov khoom siv cathode hauv micro-electrolysis packing. Nws ntau cov pores sab hauv muab nws lub peev xwm adsorption muaj zog, zoo adsorbing ob qho tib si organic pollutants thiab hnyav hlau ions hauv dej khib nyiab.

Hlau-carbon micro-electrolysis thev naus laus zis tau siv dav hauv kev kho ntau yam dej khib nyiab.

Cov txheej txheem zoo tshaj plaws rau kev kho diazonium ntsev cov dej khib nyiab siv hlau-carbon micro-electrolysis tshuab yog: chav tsev kub, dej khib nyiab pH=2, kua- rau- cov khoom sib piv 12: 5, thiab lub sijhawm tshuaj tiv thaiv 2.0 h. Raws li cov xwm txheej no, COD tshem tawm tus nqi nce mus txog 60.28%.

Cov txheej txheem micro-electrolysis siv hlau- carbon tau siv los kho dyeing thiab luam ntawv cov dej khib nyiab. Raws li kev pom zoo cov tshuaj tiv thaiv, qhov kev tshem tawm ntawm COD, turbidity, xim, ammonia nitrogen, thiab TOC hauv cov dej khib nyiab yog 75.48%, 87.88%, 75.34%, 92.01%, thiab 81.09%, feem. Cov txheej txheem tau lees paub los ntawm spectroscopic thiab gas chromatography-mass spectrometry kom ua tau zoo decompose cov pa phem xws li esters thiab cawv, hloov lawv mus rau hauv me me -cov pa phem molecule uas yooj yim kho biochemically.

Ib qho micro-electrolysis system siv xoom-valent hlau thiab granular activated carbon tau siv los kho cov dej khib nyiab ua ntej. Nyob rau hauv cov xwm txheej ntawm pH=3, xoom-valent hlau ntau npaum li cas ntawm 30 g / L, granular activated carbon ntau npaum li cas ntawm 5.75 g / L, thiab cov tshuaj tiv thaiv lub sij hawm ntawm 15 min, lub system ua tiav ib tug COD tshem tawm tus nqi ntawm 38.3% rau refinery dej khib nyiab.

1. pH tswj:

Acidic ib puag ncig (pH{0}}~ 3): Txhim kho cov cathode hydrogen evolution cov tshuaj tiv thaiv thiab txhawb kev tsim [H], tab sis kev pheej hmoo ntawm cov khoom siv corrosion yuav tsum hnyav.

Kev hloov pauv nruab nrab: Lub pH yuav tsum tau hloov mus rau 8-9 kom tso cai kom txaus flocculation thiab nag lossis daus ntawm hlau ions.

2. Innovative Packing Structure:

Anti-caking Design: Siv hlau- cov pa roj carbon composite (xws li Fe/C@Al₂O₃) los yog fluidized txaj reactors kom txo cov ntim passivation.

Kev hloov kho catalytic: Chaw thau khoom nrog cov hlau xws li Cu thiab Mn txhim kho kev hloov pauv hluav taws xob (COD tshem tawm tus nqi tuaj yeem nce 15% -20%).

3. Dynamic Aeration Control:

Huab cua- rau- dej piv ntawm 3: 1 txog 5: 1 tiv thaiv cov khoom ntim thiab muab oxidant.

Kev sib tshuam aeration hom (10 min aeration, 20 min kaw) tuaj yeem txuag tau 30% ntawm kev siv zog.

4. Packing Engineering Design Parameters:

Particle Size Distribution: The packing particle size should not be too small. It is recommended to use 2-5cm shuttle-shaped packing with a porosity >60% and a strength >600 Kg/m².

Packing Stacking Qhov siab: Pom zoo ntawm 2.0-3.0m kom tsis txhob ntim ntau dhau.

Net qhov siab: Ua tau zoo reactor qhov siab 1.2-1.5m, nrog 20% ​​nthuav qhov chaw.

Hlau -carbon loj piv: 3: 1 rau 5: 1, nce cov pa roj carbon piv rau cov organic loads siab.

1. Micro-electrolysis-Fenton (ME-Fenton) Co- txheej txheem

Siv Fe²⁺ tsim los ntawm micro-electrolysis los catalyze H₂O₂ nyob rau hauv qhov chaw: Qhov zoo: Tsis xav tau cov ntsev sab nraud, sludge ntau lawm txo los ntawm 40%, haum rau siab -cov dej khib nyiab nrog COD> 5000 mg / L.

2. Micro-electrolysis-Biological Method (ME-BAF) Kev sib xyaw

Txheej Txheem Flow: Micro-electrolysis cell → Neutralization sedimentation → Aerated biological filter (BAF)

Synergistic Effects:

Micro-electrolysis tshem tawm cov tshuaj biotoxic (xws li formaldehyde thiab phenol)

Txhim kho cov dej khib nyiab biodegradability (BOD₅ / COD nce ntawm 0.15 txog 0.35-0.45)

Kev tshem tawm tob ntawm soluble organic teeb meem los ntawm txoj kev lom neeg

3. Micro-electrolysis-Membrane Separation Technology

ME-UF/MF: Micro-electrolysis flocs ua haujlwm ua ntej kev kho mob ua ntej daim nyias nyias, txo cov membrane fouling thiab nce flux rov qab tus nqi los ntawm 25%.

1. Txheej txheem kev koom ua ke:

"Micro-electrolysis-Membrane Bioreactor" (ME-MBR): Micro-electrolysis pretreatment + biochemical enhancement + membrane sib cais ua tiav nyob ze -zero emissions.

2. Material Functionalization:

Nano-zero-valent iron-carbon composite material: Cov cheeb tsam tshwj xeeb tau nce mus rau 200 m² / g, cov tshuaj tiv thaiv nce 3 zaug.

3. Intelligent Control:

AI Dynamic Optimization System: Kho pH thiab aeration tus nqi hauv lub sijhawm raws li cov ntaub ntawv dej zoo sensor, txo kev siv hluav taws xob los ntawm 15% ~ 25%.