Electrodialysis (ED) yog ib qho txheej txheem uas siv lub semipermeable membrane thiab lub zog hluav taws xob ncaj qha los xaiv cov khoom me me uas muaj roj (xws li ions) los ntawm cov kua. Cov txheej txheem sib cais no ua rau cov kua sib xyaw, dilutes, refines, thiab purifies los ntawm kev coj cov roj uas muaj roj tawm ntawm dej thiab lwm yam khoom uas tsis muaj roj. Electrodialysis tau hloov zuj zus mus rau hauv kev ua haujlwm loj ntawm chav tshuaj lom neeg thiab ua lub luag haujlwm tseem ceeb hauv kev siv tshuab sib cais membrane. Nws pom cov ntawv thov dav hauv kev lag luam xws li kev tshem dej ntsev, kev tshem dej hiav txwv, khoom noj thiab tshuaj, thiab kev kho dej khib nyiab. Hauv qee thaj chaw, nws tau dhau los ua txoj hauv kev tseem ceeb rau kev tsim dej haus. Nws muaj cov txiaj ntsig xws li kev siv hluav taws xob tsawg, cov txiaj ntsig kev lag luam tseem ceeb, kev kho ua ntej yooj yim, cov khoom siv ruaj khov, kev tsim qauv yooj yim, kev ua haujlwm yooj yim thiab kev saib xyuas, cov txheej txheem huv si, kev siv tshuaj tsawg, kev ua qias tuaj ib puag ncig tsawg kawg nkaus, lub neej ntev ntawm lub cuab yeej, thiab cov nqi rov qab dej siab (feem ntau yog txij li 65% txog 80%).
Cov txheej txheem electrodialysis feem ntau suav nrog electrodeionization (EDI), electrodialysis reversal (EDR), electrodialysis nrog cov kua membranes (EDLM), high-temperature electrodialysis, roll-type electrodialysis, bipolar membrane electrodialysis, thiab lwm yam.
Kev siv hluav taws xob (electrodialysis) siv tau rau kev kho ntau hom dej khib nyiab, suav nrog cov dej khib nyiab electroplating thiab cov dej khib nyiab uas muaj hlau hnyav. Nws siv tau los rho cov hlau ions thiab lwm yam khoom los ntawm cov dej khib nyiab, uas ua rau rov qab tau thiab siv dua cov dej thiab cov khoom muaj nqis thaum txo cov pa phem thiab cov pa phem. Cov kev tshawb fawb tau qhia tias kev siv hluav taws xob (electrodialysis) siv tau rov qab tau tooj liab, zinc, thiab txawm tias oxidize Cr3+ rau Cr6+ thaum kho cov tshuaj passivation hauv cov txheej txheem tsim tooj liab. Tsis tas li ntawd, kev siv hluav taws xob tau ua ke nrog kev pauv ion rau kev rov qab tau cov hlau hnyav thiab cov kua qaub los ntawm cov dej khib nyiab pickling hauv kev siv hauv kev lag luam. Cov khoom siv hluav taws xob tsim tshwj xeeb, siv ob qho tib si anion thiab cation pauv resins ua cov khoom sau, tau siv los kho cov dej khib nyiab hlau hnyav, ua tiav kev rov ua dua tshiab thiab xoom kev tso tawm. Kev siv hluav taws xob kuj tseem siv tau los kho cov dej khib nyiab alkaline thiab cov dej khib nyiab organic.
Kev tshawb fawb ua nyob rau hauv Lub Xeev Chaw Kuaj Xyuas Kev Tswj Xyuas Kev Ua Phem thiab Kev Siv Khoom Siv Dua Tshiab hauv Suav teb tau kawm txog kev kho cov dej khib nyiab alkali uas muaj epoxy propane chlorination tail gas siv ion exchange membrane electrolysis. Thaum lub zog electrolysis yog 5.0V thiab lub sijhawm ncig yog 3 teev, tus nqi COD tshem tawm ntawm cov dej khib nyiab tau txog 78%, thiab tus nqi rov qab alkali yog siab txog 73.55%, ua haujlwm ua ntej kho rau cov chav biochemical tom ntej. Cov thev naus laus zis Electrodialysis kuj tau siv los kho cov dej khib nyiab organic acid uas muaj ntau, nrog rau cov concentration ntawm 3% txog 15%, los ntawm Shandong Luhua Petrochemical Company. Txoj kev no ua rau tsis muaj cov seem lossis cov pa phem thib ob, thiab cov kua qaub uas tau txais muaj 20% txog 40%, uas tuaj yeem rov ua dua thiab kho, txo cov ntsiab lus acid hauv cov dej khib nyiab rau 0.05% txog 0.3%. Ntxiv rau, Sinopec Sichuan Petrochemical Company tau siv lub tshuab electrodialysis tshwj xeeb los kho cov dej khib nyiab uas muaj condensate, ua tiav lub peev xwm kho siab tshaj plaws ntawm 36 t/h, nrog rau cov ammonium nitrate hauv cov dej concentrated nce mus txog ntau dua 20%, thiab ua tiav tus nqi rov qab tau ntau dua 96%. Cov dej tshiab uas tau kho muaj ammonium nitrogen mass fraction ntawm ≤40mg/L, ua tau raws li cov qauv ib puag ncig.
Lub sijhawm tshaj tawm: Cuaj hlis-07-2023
