Maitiro ekubata neRO membrane fouling

Membrane fouling inoreva chiitiko chisingachinjiki umo zvimedu, colloidal particles, kana solute macromolecules mune feed solution inosangana ne membrane adsorb uye inoisa pa membrane pamusoro kana pores nekuda kwekusangana kwemuviri kana kemikari ne membrane, kana concentration polarization inoita kuti mamwe masolute apfuure kunyungudika kwawo uye kudzikira kwemembrane mhedzisiro. flux uye kupatsanurwa maitiro.

Microbial kusvibiswa

1）Zvikonzero zvekuumbwa kwayo

Kusvibiswa kweMicrobial kunoreva chiitiko apo tupukanana tunoungana pa membrane mvura interface, nekudaro zvichikanganisa mashandiro ehurongwa. Aya ma microorganisms anowanda uye anokura achishandisa reverse osmosis membranes sevatakuri uye zvinovaka muviri kubva muchikamu chemvura chakadzika che reverse osmosis, ichigadzira biofilm layer pamusoro peiyo reverse osmosis membrane. Izvi zvinotungamira kukurumidza kuwedzera kwekumanikidza musiyano pakati pekupinza uye kubuda kweiyo reverse osmosis system, kukurumidza kudzikira mukugadzirwa kwemvura uye desalination rate, uye kusvibiswa kwemvura yechigadzirwa. Biofilms inoumbwa nehutachiona hunogona zvakananga (kuburikidza nekuita enzymatic) kana zvisina kunanga (kuburikidza nepH yemuno kana kuderedza zvinogoneka) kushatisa membrane polymers kana zvimwe reverse osmosis unit zvikamu, zvichikonzera kupfupikiswa kwehupenyu hwe membrane, kukuvadzwa kwe membrane chimiro kutendeseka, uye kunyangwe kutadza kukuru kwehurongwa.

2) Nzira yekudzora

Iyo nzira yekudzora yekusvibiswa kwebiological inogona kuwanikwa nekuramba kana kupindirana kuvharisa uye kuuraya utachiona mvura iri kuuya. Sterilization uye dosing zvishandiso zvinofanirwa kuiswa pamvura mbishi inounganidzwa kubva pamusoro uye isina kudzika pasi pevhu, uye chlorine fungicides inofanirwa kuwedzerwa. Chiyero chacho chinowanzobva pane zvakasara zveklorini mune inofurira kuva yakakura kupfuura 1mg/L.

Kemikari foiling

1) Zvikonzero zvekuumbwa kwayo

Zvinowanzo konzeresa kusvibiswa kwemakemikari kuiswa kwekabhoni chiyero mukati memembrane zvikamu, izvo zvinonyanya kukonzerwa nekusashanda zvakanaka, isina kukwana scale inhibitor dosing system, uye kukanganiswa kwe scale inhibitor dosing panguva yekushanda. Kana ikasaonekwa panguva yakakodzera, chiitiko chekuwedzera kudzvinyirira kwekushanda, kuwedzera kwekumanikidza musiyano, uye kuderera kwehuwandu hwekugadzira mvura kuchaitika mukati memazuva mashoma. Kana iyo yakasarudzwa scale inhibitor isingaenderane nemhando yemvura kana kuti dosi haina kukwana, kuyera mukati me membrane element kuchaitika zvakare. Kuyera kunyoro mukati memembrane element kunogona kudzoserwa kubasa rayo kuburikidza nekucheneswa kwemakemikari, uye mumatambudziko akaomarara, zvinogona kukonzera kuti zvimwe zvakasvibiswa zvakanyanya membrane zviraswe.

2) Nzira yekudzora

Iyo yekudzora nzira yekudzivirira kuyera mukati me membrane element ndeyekutanga kusarudza yakakodzera reverse osmosis scale inhibitor yemhando yemvura sosi yehurongwa, uye kuona iyo yakakwana dosage. Chechipiri, simbisa kutariswa kweiyo dosing system, nyatso tarisisa shanduko dzisina kujeka mumaparamendi ekushanda, uye nekukasira kuona chikonzero chechero kukanganisa. Pamusoro pezvo, iyo yakakwira Fe3+ iri mumvura inonyanya kukonzerwa nemapombi masisitimu. Naizvozvo, simbi yakamisikidzwa mapaipi epurasitiki anofanirwa kushandiswa zvakanyanya sezvinobvira pamapaipi ehurongwa, kusanganisira mapaipi emvura, kudzikisa Fe3 + zvirimo.

Yakambomiswa zvinhu uye kusvibiswa kwecolloidal

1) Zvikonzero zvekuumbwa kwayo

Zvimedu zvakamiswa uye colloids ndizvo zvinhu zvikuru zvinovhara reverse osmosis membranes, uye zvakare ndizvo zvikonzero zvikuru zvekupfuura effluent SDI (sludge density index). Nekuda kwekusiyana kwezvitubu zvemvura uye matunhu, kune misiyano yakakura mukuumbwa kwezvimedu zvakamiswa uye colloids. Izvo zvakakosha zvemvura isina kusvibiswa pamusoro pemvura uye isina kudzika pasi pasi mabhakitiriya, ivhu, colloidal silica, iron oxides, humic acid zvigadzirwa, pamwe neartificially yakawandisa kupinza yecoagulants uye coagulants (senge iron salt, aruminiyamu munyu, nezvimwewo) mu pretreatment system. Pamusoro pezvo, kunaya kwakagadzirwa nemusanganiswa wemapolima anochajiswa zvakanaka mumvura mbishi uye nechaji isina kunaka mascale inhibitors mune reverse osmosis system zvakare chimwe chezvikonzero zvekusvibisa kwakadaro.

2) Nzira yekudzora

Kana iyo yakamiswa yakasimba yemukati mumvura mbishi inodarika 70mg/L, coagulation, kujekesa, uye kusefa pretreatment nzira dzinowanzoshandiswa; Kana iyo yakaturikwa yakasimba mukati memvura mbishi isingasviki 70mg/L, coagulation filtration inowanzo shandiswa pretreatment; Kana iyo yakamiswa yakasimba yemukati mumvura mbishi isingasviki 10mg/L, iyo yakananga filtration pretreatment nzira inowanzo shandiswa. Uye zvakare, microfiltration kana ultrafiltration inzira inoshanda yekurapa membrane ye turbidity uye isinganyungudika organic zvinhu zvakabuda munguva pfupi yapfuura. Inogona kubvisa zvese zvakamira zvakamira, mabhakitiriya, akawanda colloids, uye isinganyunguke organic zvinhu, uye ndiyo yakanakira pre-kurapa maitiro ekudzosera kumashure osmosis masisitimu.