Kev kho cov chromium uas muaj cov dej khib nyiab los ntawm Electroplating ntawm Hluav Taws Kub Kub Tubes
Tso lus
Kev kho cov chromium uas muaj cov dej khib nyiab los ntawm Electroplating ntawm Hluav Taws Kub Kub Tubes
2.1 Txheej txheem khiav
Electroplating wastewater kho cov txheej txheem feem ntau suav nrog chemical method, ion exchange method, adsorption method, electrolysis method, reverse osmosis method and electrodialysis method. Tam sim no, cov txheej txheem kev kho mob nrog cov txiaj ntsig kev kho mob ruaj khov, muaj zog yoog raws, tus nqi kho mob qis thiab kev tswj xyuas yooj yim tseem yog tus paub tab thiab txhim khu kev qha nrog cov txheej txheem tshuaj. Nrog rau kev siv rau hauv kev lag luam electroplating kev lag luam dej khib nyiab, ua ke nrog cov kua dej tiag tiag ntawm qhov project, cov txheej txheem kho dej khib nyiab yog qhia hauv daim duab 1.
2.2 Txheej txheem piav qhia thiab cov qauv tsim
2.2.1 Pretreatment of wastewater kho mob
Cov dej khib nyiab ua ntej muaj cov emulsions, surfactants, cov kuab tshuaj tshuaj, cov kua qaub thiab alkalis, thiab lwm yam. Nws raug sau tseg thiab nkag mus rau hauv cov dej khib nyiab ua ntej kev tswj hwm lub tank rau homogenization. Tom qab ntawd, nws nkag mus rau hauv huab cua flotation tank rau ntxiv polyaluminium chloride coagulation cov tshuaj tiv thaiv. Cov huab cua flotation scum yog scraped tawm thiab nkag mus rau hauv lub sludge tank. Tom qab kev kho mob, cov effluent tawm mus rau hauv lub hnyav hlau khib nyiab tswj tank rau kev kho mob. Vim tias qhov ntsuas me me ntawm qhov kev kho dej muaj peev xwm, kev sib xyaw ua ke ua kom yaj huab cua flotation tau txais yuav los txo qhov chaw xav tau, nrog rau cov dej yaj huab cua sib piv ntawm 30-40 feem pua.
2.2.2 Kev kho cov tooj liab Pyrophosphate uas muaj cov dej khib nyiab
2.2.3 Chromium muaj kev kho dej khib nyiab
Chromium uas muaj cov dej khib nyiab yog thawj zaug hloov kho los ntawm kev ntxiv sulfuric acid los kho nws cov pH, thiab qee cov kua qaub pov tseg tau ntxiv thaum lub sijhawm ua haujlwm kom txo tau cov khoom lag luam sulfuric acid. Raws li kev xaiv ntawm tus neeg sawv cev txo qis, vim muaj ntau cov sludge tsim los ntawm ferrous sulfate, sodium bisulfite yog siv los txo hexavalent chromium rau trivalent chromium. Lub peev xwm txo oxidation yog ze ze rau pH hauv cov txheej txheem ntawm chromium txo cov tshuaj tiv thaiv. pH thiab ORP controllers yog siv los tswj qhov ntau npaum li cas, pH yog tswj ntawm 2-3, thiab oxidation txo peev xwm yog tswj ntawm li 300mV. Cov qauv tsim tsis tsim nyog txuas ntxiv cov tshuaj tiv thaiv nyob rau lub sijhawm piv nrog cov qauv kev kho mob, thiab lub sijhawm tshuaj tiv thaiv yog 30min. Tom qab kev txo qis, trivalent chromium thiab cov dej khib nyiab hnyav tau muab tso ua ke rau kev kho mob tsim hydroxide precipitates rau kev tshem tawm.
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