Kev kho ntawm Chromium uas muaj Electroplating Wastewater los ntawm Hluav Taws Kub Kub Tube Microfiltration Method

Kev kho ntawm Chromium uas muaj Electroplating Wastewater los ntawm Hluav Taws Kub Kub Tube Microfiltration Method

Kev tso tawm txhua xyoo ntawm Cr uas muaj cov dej khib nyiab hauv Suav teb yog kwv yees li 1.7 billion cubic meters [1], ntawm cov khoom siv Cr, tshwj xeeb tshaj yog Cr6 ntxiv, yog cov khoom siv carcinogenic thiab raug cais raws li lub teb chaws Class 1 cov khoom phom sij [2]. Tam sim no, ntau cov nroj tsuag electroplating siv tshuaj txo cov nag lossis daus los tshem tawm Cr los ntawm electroplating wastewater, ntxiv txo cov neeg ua hauj lwm rau cov electroplating khib nyiab, kom tag nrho cov Cr muaj nyob rau hauv lub plus 3 valence xeev, Cr3 ntxiv tuaj yeem tsim Cr (OH) 3 precipitates nyob rau hauv alkaline tej yam kev mob. Txawm li cas los xij, vim qhov micro solubility ntawm Cr (OH) 3 thiab qhov nyuaj ntawm kev txo qis Cr6 ntxiv, nws nyuaj rau tshem tawm chromium los ntawm cov dej ntws tawm. Xyoo 2008, Tuam Tshoj tau tshaj tawm "Electroplating Pollutant Discharge Standard" (GB21900-2008), ntxiv txhim kho tus qauv tso tawm ntawm cov dej khib nyiab electroplating. Los ntawm cov txiaj ntsig kev tshawb fawb, kev cia siab rau ib qho tshuaj txo cov nag lossis daus los kho cov dej khib nyiab electroplating yog qhov nyuaj kom ua tau raws li tus qauv tshiab.

Raws li cov nyhuv flocculation ntawm FeSO4, tus kws sau ntawv thov kom siv cov txheej txheem microfiltration membrane rau kev kho mob siab heev ntawm electroplating dej khib nyiab kho los ntawm kev txo cov nag lossis daus. FeSO4 yog siv los ua tus neeg sawv cev txo qis los hloov Cr6 ntxiv rau hauv cov dej khib nyiab rau hauv Cr3 ntxiv, kho cov pH los ua Cr (OH) 3 nag lossis daus, thiab tib lub sij hawm, cov hlau ions tau txais hydrolysis los ua flocculants nrog muaj zog flocculation thiab adsorption cuam tshuam xws li Raws li Fe (OH) 2 thiab Fe (OH) 3, Net ntes ntawm Cr3 ntxiv, Cr6 ntxiv, thiab ib feem raug tshem tawm Cr (OH) 3 hais nyob rau hauv lub supernatant, supplemented los ntawm tsawg txaus aeration thaum lub sij hawm flocculation theem los txhawb kev sib cuag ntawm hais thiab txhim kho flocculation efficiency, ua raws li los ntawm 0.1 μ M microfiltration membrane cuam tshuam flocs thiab ua cov txheej txheem membrane sib cais kom tshem tawm Cr

Aeration tuaj yeem ceev qhov sib xyaw thiab kev sib cuag ntawm cov tshuaj reactants, uas pab txhim kho cov nyhuv flocculation thiab tsim cov flocculent loj dua [6]. Txawm li cas los xij, thaum lub aeration tus nqi ntau dua 0.2 m3 / h, tag nrho cov ntsiab lus Cr txo qis, thiab nce tus nqi aeration yuav nce nqi khiav hauj lwm. Nyob rau tib lub sijhawm, nws tau pom tias qhov nce ntawm qhov aeration mus rau qee qhov yuav cuam tshuam kev tsiv teb tsaws ntawm cov dej molecules rau ntawm daim nyias nyias, uas ua rau txo qis hauv daim nyias nyias. Zuag qhia tag nrho, Qhov kev sim no tau txais kev tso pa tawm ntawm 0.2 m3 / h

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