ED electrodialysis yog ib qho zoo heev membrane sib cais tshuab uas xaiv tso cai rau ions nyob rau hauv ib tug tov kom dhau los ntawm ib tug ion pauv membrane. Ua ntej, qhov siab - zaus tam sim no hluav taws xob tam sim no yog siv los ua kom muaj kev hloov pauv ntawm cov anions thiab cations hauv cov tshuaj. Lub anion thiab cation txauv membrane ces xaiv tso cai rau cov ions hla dhau, ua tiav ion sib cais.
ED electrodialysis membranes yog tsim los ntawm cov khoom siv organic. Hauv cov ntawv thov uas muaj siab - cov dej khib nyiab ntsev, zoo li lwm cov organic membranes, lawv muaj kev cuam tshuam rau fouling los ntawm ntau yam kuab paug hauv dej, cuam tshuam rau ntau yam kev ua haujlwm. Tus yuam sij rau kev ua haujlwm ruaj khov ntawm electrodialysis yog cov txheej txheem ua ntej. Tsuas yog thaum cov txheej txheem pretreatment ua haujlwm kom raug thiab cov khoom siv dej ua tau raws li cov dej pub ntawm ED electrodialysis membrane tuaj yeem ua haujlwm ruaj khov rau lub sijhawm ntev.
ED electrodialysis membrane fouling muaj xws li cov organic teeb meem, inorganic teeb meem, thiab microbial paug.
1. Organic Matter Contamination
Cov teeb meem organic, tshwj xeeb tshaj yog tsis zoo them cov organic teeb meem, feem ntau yuav foul daim nyias nyias. Txij li cov organic teeb meem feem ntau yog tsis zoo them, anion pauv daim nyias nyias yog ntau raug rau cov organic paug. Tsis zoo them cov organic teeb meem migrate mus rau lub anion pauv daim nyias nyias nyob rau hauv lub zog ntawm ib tug hluav taws xob teb. Feem ntau, vim qhov hnyav molecular ntawm cov organic ions, lawv nyuaj dhau los ntawm kev sib pauv ntawm daim nyias nyias thiab sib sau rau ntawm daim nyias nyias, ua rau anion pauv membrane fouling. Uncharged organic teeb meem, thaum dhau los ntawm cov ndlwg channel, feem ntau undergoes adsorption, ua rau daim nyias nyias fouling. Vim hais tias nws tsis tsiv mus nyob rau hauv lub zog ntawm ib tug hluav taws xob teb, lub resulting membrane fouling yog qeeb qeeb, thiab cov concentration ntawm cov organic teeb meem nyob rau hauv lub concentrate tsis concentrated, tso cai rau tshem tawm los ntawm daim nyias nyias. Dodecyl sulfate, ib qho muaj kuab paug nyob hauv cov dej khib nyiab, yog ib qho tseem ceeb rau ED electrodialysis membrane kev ua tau zoo. Lub electrodialysis membrane yog rhiab heev rau cov concentration ntawm cov surfactants, yuav tsum tau pretreatment rau tshem tawm. Tsis tas li ntawd, ketones thiab lwm cov kuab tshuaj organic uas muaj zog yaj lub zog kuj tseem ua rau cov ntaub ntawv membrane puas.
2. Inorganic Fouling
Cov nplai tsim los ntawm cov tshuaj tiv thaiv electrode, xws li calcium hydroxide thiab calcium sulfate, deposits ntawm lub electrode chamber thiab electrodes. Cov tshuaj tiv thaiv polarization ua rau cov nplai tsim ntawm daim nyias nyias, tshwj xeeb tshaj yog ua rau magnesium hydroxide thiab lwm yam precipitates los ua rau ntawm cov concentrate sab thiab hauv daim nyias nyias. Thaum lub sij hawm txheej txheem concentration nyob rau hauv lub concentrate chamber, supersaturation ua rau nag lossis daus ntawm nplai, xws li calcium carbonate, magnesium carbonate, thiab calcium sulfate precipitates. Cov kev tswj tau zoo muaj xws li siab -pretreatment ceev kom txo cov hardness thiab txo cov concentration ntawm cov ions. Kev khi ntawm siab -valence ions mus rau cation exchange membrane tshuaj lom nws, ua rau nws nyuaj rau tshem tawm thiab txo nws cov peev xwm pauv. Cov ions no xav tau kev tshem tawm ua ntej; Kev tshem tawm tob feem ntau yog siv ion txauv resins.
3. Cov kab mob microbial
Cov kab mob tau yooj yim tso rau ntawm daim nyias nyias thiab loj hlob thiab sib npaug hauv qhov sib txawv ntawm cov khoom sib cais, ua rau cov membrane tsis kam, cuam tshuam cov dej ntws, thiab cuam tshuam kev ua haujlwm ntawm electrodialysis. Tshem tawm cov kab mob los ntawm pretreatment yog txoj hauv kev tseem ceeb los txo cov kab mob microbial.