2 hom kev pabcuam uas tuaj yeem rov qab los ntawm nanofiltration technology

Dab tsi yog nanofiltration?

Nanofiltration (NF) yog ib qho semi-permeable membrane (ib qho ultra-thin selective barrier) siv los lim dej hauv ntau qhov kev lag luam. Nanofiltration pore loj yog nyob nruab nrab ntawm 1 ~ 10 nm, ntawm rov qab osmosis thiab ultrafiltration, thiab nws yog qhov thib ob tuab zaj duab xis.

Cov kua yog thawb los ntawm daim nyias nyias los ntawm lub siab: cov khoom me dua li txoj kab uas hla ntawm nanofiltration membrane aperture yuav dhau mus, thaum cov khoom loj dua li txoj kab uas hla ntawm nanofiltration membrane aperture yuav raug kaw. Cov khoom tuaj yeem tsis tsuas yog raug cuam tshuam los ntawm qhov loj me, tab sis kuj tseem tuaj yeem xaiv nyiam lossis tshem tawm qee yam kab mob nyob ntawm lawv cov nqi lossis tshuaj lom neeg, nrog rau kev cuam tshuam los ntawm daim nyias nyias.

Nanofiltration txhim kho cov dej zoo, thiab nws siv zog tsawg dua rov qab osmosis (RO). Rau kev kho mob ntawm qee cov dej uas tsis tas yuav tshem tawm cov salinity siab, nanofiltration daim nyias nyias tuaj yeem siv los ua cov txheej txheem zoo rau RO, nrog lub peev xwm tshem tawm cov kab mob, kab mob, cov organic teeb meem thiab bivalent ions.

Nanofiltration yog thawj zaug siv rau kev tshem tawm sulfate hauv kev lag luam roj thiab roj, tab sis tam sim no siv hauv kev lag luam kho dej, piv txwv li, dej softening, dej haus thiab kho cov dej khib nyiab thiab brine ntau ntau. Tsis ntev los no, nanofiltration kuj tau siv los tshem tawm cov kab mob tshwm sim los ntawm cov dej haus.

Nanofiltration thev naus laus zis tuaj yeem ua ntej rov qab cov dej zoo tsim nyog rau kev rov qab siv dua, raws li lub tswv yim ntawm kev lag luam ncig, tab sis kuj los ntawm kev rov qab los ntawm lwm cov peev txheej (xws li cov khoom siv roj ntsha, cov zaub mov thiab tshuaj) maj mam tau txais kev nyiam hauv khw.

Sodium hydroxide (NaOH)

Sodium hydroxide (NaOH) yog ntau yam alkaline ntsev uas corrodes thiab dissolves organic thiab inorganic cov ntaub ntawv. Yog li ntawd, nws yog siv nyob rau hauv tu, tshem tawm rog thiab stripping txheej txheem nyob rau hauv ntau yam lag luam.

Vim lub siab concentration ntawm cov pa phem nyob rau hauv pov tseg caustic soda, nws yog feem ntau tsis siv dua nyob rau hauv industrial ntau lawm. Hloov chaw, lwm yam tshuaj, xws li hydrochloric los yog sulfuric acid, yuav tsum tau ntxiv rau neutralize alkalinity. Txawm li cas los xij, nrog kev siv tshuab nanofiltration, pov tseg caustic soda tuaj yeem rov qab tau thiab rov siv dua los ntawm kev tshem tawm impurities.

Ib qho ntawm cov neeg siv khoom loj tshaj plaws hauv cheeb tsam ntawm caustic soda yog South Asia, uas muaj kev lag luam textile loj. Ntawm no, cov tshuaj caustic soda tsis yog tsuas yog siv los ntxuav, tab sis kuj yog ib feem tseem ceeb ntawm textile manufacturing, tshwj xeeb tshaj yog nyob rau hauv cov txheej txheem bleaching uas nws txhim kho lub zog, ci thiab dye affinity ntawm paj rwb fibers.

Txij li xyoo 2020, peb tau txais kev nug ntau zaus rau nanofiltration membranes nyob rau sab hnub tuaj Asia ua lag luam. Yog li ntawd, nyob rau hauv tib lub xyoo, peb lub tuam txhab tsim nws tus kheej nanofiltration membrane ntau lawm kab. Ua kev sib txuas lus nrog pab pawg los ntawm cov npe nrov thoob ntiaj teb xws li Dow, HYDRANAUTICS, Toray, Vontron, thiab lwm yam.

HID HNF-8040HF yog peb thawj tus qauv ntawm nano membrane, uas tau los ua tus qauv txhawb nqa loj thiab tau txais kev qhuas los ntawm cov neeg siv khoom hauv kev lag luam textile.

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Recycled fertilizer

Phosphorus, uas yog ib qho tseem ceeb hauv cov chiv, tab tom ua tsis tshua muaj, ua rau muaj kev txhawj xeeb txog kev ruaj ntseg zaub mov mus sij hawm ntev. Phosphorus yog ib qho kev nplua nuj uas tau los ntawm phosphate mining. Nrog rau lub ntiaj teb phosphorus reserves dwindling thiab nyob rau hauv ib cheeb tsam, mov chains yog yooj yim.

Nyob rau tib lub sijhawm, cov concentration ntau dhau ntawm cov khoom noj muaj txiaj ntsig no ua rau muaj kev puas tsuaj rau lub ecosystem, ua rau muaj kuab paug loj rau lub cev dej los ntawm cov txheej txheem ntawm eutrophication. Los ntawm kev ntes thiab rov ua dua cov khoom noj no los tsim cov peev txheej lom neeg, ob qho kev sib tw tuaj yeem daws tau ib txhij: kev ruaj ntseg zaub mov thiab kev puas tsuaj ib puag ncig.

Txawm hais tias nanofiltration tsis yog txheej txheem tseem ceeb rau kev siv cov chiv ua dua tshiab, nws tuaj yeem tsim cov khoom lag luam zoo dua los ntawm kev tshem tawm cov impurities thiab tsom rau cov as-ham hauv cov kua txiv hmab txiv ntoo. Nrog rau txoj kev coagulation-flocculation, cov khoom siv raw tuaj yeem kis tau cov tshuaj seem, thaum nanofiltration zam qhov teeb meem no los ntawm lub cev sib cais los ntawm daim nyias nyias es tsis yog tshuaj lom neeg. Ntxiv nrog rau kev tsim cov khoom siv roj ntsha zoo thiab tsim cov txiaj ntsig zoo rau cov neeg siv khoom kawg, cov dej tso tawm tau zoo kuj tau txhim kho thiab cov nqi kho biosolids tau txo.