Polyacrylamide (PAM) tuaj yeem ua rau irreversible fouling rau ntau hom lim membranes. Kab lus no tsom mus rau kev tsom xam ntawm inorganic membrane fouling. Ib qho teeb meem ntev - sawv ntsug nrog kev ua haujlwm tsis zoo ntawm daim nyias nyias yog tias ntev npaum li PAM dawb muaj nyob rau hauv lub cev, lub hauv paus membrane yuav muaj kev nce ntxiv hauv qhov sib txawv ntawm qhov sib txawv thiab tsis tuaj yeem thim rov qab, thiab cov kua qaub thiab alkali ntxuav tsis txaus los kho nws qhov kev pom thawj zaug.
I. Inorganic daim nyias nyias tsis muaj kev cuam tshuam rau corrosion, tab sis lawv tsis tuaj yeem tiv thaiv tsis tau cov ntaub ntawv polymer.
Feem ntau inorganic daim nyias nyias ntawm lub lag luam yog tus cwj pwm los ntawm cov qauv tshuaj ruaj khov thiab muaj zog txhua yam, ua rau lawv resistant rau tshuaj corrosion thiab yog li dav siv nyob rau hauv ntau yam kev lag luam dej kho scenarios. Txawm li cas los xij, kev puas tsuaj los ntawm PAM rau inorganic membranes tsis suav tias yog tshuaj lom neeg corrosion; Nws feem ntau tshwm sim hauv ob hom fouling:
Polymers ua raws li daim nyias nyias thiab cov phab ntsa sab hauv ntawm lub qhov hws, hloov cov membrane tus thawj hydrophilic filtration interface.
Cov polymers dawb nkag mus rau hauv micron - qhov loj me me ntawm qhov pores, qhov ntev molecular chains coil, choj, thiab entangle, ua rau muaj kev sib sib zog nqus sab hauv.
Kev sib txuas ntawm polyacrylamide (PAM) (Duab los ntawm internet)
Cov huab cua yooj yim- dej yaug, ntxuav kua qaub, lossis alkaline ntxuav tsuas tuaj yeem tshem tawm cov sludge hauv qab thiab tsis tuaj yeem tshem tawm tag nrho cov siab -molecular- hnyav fouling nyob rau hauv daim nyias nyias pores. Ntau hom PAMs txawv tsuas yog nyob rau hauv tus nqi ntawm fouling txoj kev loj hlob thiab daim ntawv ntawm clogging;tsis muaj ib hom PAM muaj kev nyab xeeb thiab muaj kev pheej hmoo - pub dawb rau cov kab mob tsis muaj kab mob.
II. Txawv fouling yam ntxwv ntawm inorganic membranes thaiv los ntawm peb hom PAM
Txawm hais tias hom PAM siv, ntev npaum li cov polymers dawb tsis tu ncua nkag mus rau hauv cov khoom siv tsis zoo, cov teeb meem hauv qab no yuav tshwm sim:
nyob rau hauv daim nyias nyias pores, sib sib zog nqus blockages uas tsis tuaj yeem tshem tawm los ntawm kev ntxuav;
Cov polymer yog cov pa roj carbon- muaj cov organic teeb meem uas txuas ntxiv muab cov as-ham rau cov kab mob, txhawb kev loj hlob ntawm cov kab mob lom;
Organic residue khaubncaws sab nraud povtseg adsorb calcium, magnesium, thiab hlau hydroxides nyob rau hauv dej, uas tsub kom tsim multi- txheej paug paug.
Kev tu cov kua qaub thiab alkali ib leeg tsis tuaj yeem tshem tawm cov pa phem tsis zoo los ntawm cov polymers.
III. Silicon carbide ceramic daim nyias nyias: cov tshuaj nyiam tom qab PAM paug
Tau ntsib nrog kev sib tw ntawm kev txwv tsis pub siv tshuaj nyob rau hauv cov ntaub so ntswg zoo tib yam thiab kev tu tsis tiav ntawm cov tawv nqaij PAM, silicon carbide ceramic membranes tau dhau los ua qhov kev xaiv zoo tshaj plaws rau kev cuam tshuam nrog PAM paug vim lawv qhov kev ua tau zoo dua.
Silicon carbide ceramic membranes tiv taus pH 1-14 acids thiab alkalis thiab kub kub. Lawv cov kev ua tau zoo tuaj yeem rov qab tau zoo siv cov txheej txheem tu: Ua ntej, 60℃alkaline tov yog siv ua ke nrog EDTA rau kev tu huv. Cov nyhuv saponification ntawm high-temperature alkaline tov decomposes PAM residue ntawm daim nyias nyias thiab pore nto. EDTA tuaj yeem chelate calcium thiab magnesium ions hauv dej, tiv thaiv nplai los ntawm kev tsim cov pa phem nrog PAM. Feem ntau ntawm cov pa phem me me mus rau nruab nrab, cov kua nplaum tuaj yeem rov qab mus rau 90% ntawm nws cov nqi pib tom qab ntxuav nrog qhov kev pab cuam no.
Yog hais tias PAM muaj paug loj heev tshwm sim thiab cov pa alkaline ntxuav + EDTA cov kev daws teeb meem tsis ua kom huv ntawm daim nyias nyias, silicon carbide ceramic daim nyias nyias tuaj yeem "recycled" los ntawm siab -kub calcination regeneration technology. Siv nws lub siab -kub tsis kam, cov tawv tawv thiab insoluble PAM polymers nyob rau hauv daim nyias nyias pores yog kiag li hlawv thiab decomposed los ntawm siab -kub kev kho mob, kom huv si tshem tawm qhov tob blockages. Tom qab kev tsim kho dua tshiab, cov txheej txheem membrane qhov kev ua tau zoo tuaj yeem rov qab los rau nws lub xeev qub, qhov zoo dua qub uas nyuaj rau kev ua tiav nrog lwm cov ntaub ntawv hauv cov khoom siv tsis zoo.
Piv nrog rau lwm cov khoom siv tsis zoo, silicon carbide ceramic membranes muab cov txiaj ntsig zoo hauv PAM-cov xwm txheej tsis sib haum xeeb: hloov kho cov kev daws teeb meem, rov ua kom zoo dua, rov ua cov tshuaj ntxuav tu kom ntev lub neej kev pab cuam, zoo heev corrosion kuj thiab siab -kub tsis kam, thiab tsis muaj kev puas tsuaj rau cov membrane substrate thaum ntxuav thiab rov tsim dua tshiab. Lawv tshwj xeeb tshaj yog tsim nyog rau cov kev kho dej tsis zoo xws li cov dej khib nyiab uas muaj PAM thiab cov roj av ua dej. Nws yog ib qho tseem ceeb uas yuav tsum nco ntsoov tias txawm tias muaj peev xwm rov qab tau zoo heev, tsis pom zoo PAM ntxiv; tswj tus nqi ntawm PAM ntawm qhov chaw yog qhov tseem ceeb los txo cov nqi khiav lag luam thiab kev saib xyuas.
Cov ntsiab lusy
Tag nrho cov lim membranes raug rau PAM fouling. Txhua hom polyacrylamide polymer nkag mus rau hauv daim nyias nyias yuav ua rau muaj kev pheej hmoo ntawm irreversible clogging. Lub hauv paus ntsiab lus tseem ceeb ntawm cov txheej txheem tsim thiab ntawm - chaw ua haujlwm thiab kev saib xyuas yog kom tsis txhob ntxiv PAM ua ntej daim nyias nyias. Yog hais tias tus txheej txheem tsis tuaj yeem zam tau, qhov ntau npaum li cas yuav tsum tau tswj nruj me ntsis, thiab txaus cov sedimentation thiab multi-theem filtration yuav tsum tau siv los txo cov dawb polymer load los ntawm qhov chaw thiab ua rau cov txheej txheem inorganic membrane fouling.
1. Peb zoo siab tos txais cov npoj yaig hauv cov txheej txheem kev kho dej thiab kev ua haujlwm los qhia lawv cov kev paub dhau los thiab cov teeb meem hauv kev ua haujlwm ntawm ntau cov txheej txheem membrane hauv nqe lus, thiab kawm los ntawm ib leeg.
2. Peb yog cov kws tshaj lij ntawm cov khoom siv silicon carbide ceramic membrane, thiab tuaj yeem muab cov kev daws teeb meem loj rau cov kev xav tau sib txawv. Thov xa email rau peb kom paub meej.
3. Peb lub tuam txhab yog niaj hnub nrhiav neeg txawj ntse; cov kws tshaj lij kev lag luam zoo siab tos txais los nug thiab thov.