Cov Ua Rau Thiab Cov Kev Daws Teeb Meem Rau Reverse Osmosis Membrane Fouling

1. Cov Ua Rau RO Membrane Fouling Tseem Ceeb

Nyob ntawm cov foulants, RO membrane fouling feem ntau yog categorized ua plaub hom:

• Kev Ua Rau Tsis Muaj Organic (Kev Ua Rau Muaj Tshuaj Lom): Thaum lub sijhawm RO concentration, cov ntsev uas yaj tau yooj yim xws li calcium, magnesium, carbonates, sulfates, thiab silicates hauv dej pub tshaj lawv cov kev txwv solubility. Lawv crystallize thiab tso rau ntawm qhov chaw membrane, tsim ib txheej tawv.
• Kev Ua Phem Organic thiab Colloidal (Kev Ua Phem Viscous): Cov khoom siv organic ntuj (piv txwv li, humic acid), roj, surfactants, lossis cov khoom me me thiab colloids uas tsis tau tshem tawm tag nrho hauv cov dej pub yuav lo rau ntawm qhov chaw ntawm daim nyias nyias. Qhov no tsim ib txheej viscous fouling uas tsis yog tsuas yog thaiv cov qhov hws ntawm daim nyias nyias xwb tab sis kuj nqus lwm yam tsis huv.
• Kev Ua Phem Txog Kab Mob (Kev Ua Phem Rau Kev Yug Me Nyuam): Thaum tsis tau tua kab mob txaus rau hauv dej pub tsiaj, cov kab mob me me xws li cov kab mob bacteria, cov pwm, thiab cov algae yuav loj hlob sai sai rau ntawm qhov chaw ntawm daim nyias nyias. Lawv tsim cov biofilm uas ruaj khov thiab tso tawm cov metabolites uas tuaj yeem ua rau cov khoom ntawm daim nyias nyias puas tsuaj.
• Kev Ua Phem Rau Cov Khoom Me Me (Kev Ua Phem Rau Lub Cev): Cov khoom me me uas dais tawm xws li xuab zeb thiab xeb hauv cov dej pub feem ntau nkag mus rau hauv lub cev vim tsis tau kho ua ntej lossis tsis ua tiav. Lawv tso rau ntawm qhov chaw ntawm daim nyias nyias lossis ntawm qhov chaw hla ntawm cov khoom pub.

2. Yuav Ua Li Cas Txheeb Xyuas Seb Puas Yog Yuav Tsum Tau Ntxuav

Feem ntau yuav tsum tau ntxuav thaum lub kaw lus muaj cov xwm txheej hauv qab no:

• Txo Cov Dej Ntws Uas Nkag Tau: Cov dej ntws permeate uas tau hloov pauv li qub poob qis 10% ~ 15% piv rau qhov pib pib.
• Kev Nyuaj Siab Nce Siab: Qhov kev poob siab ntawm theem nruab nrab nce ntxiv ntau heev (piv txwv li, ntau dua 15%, lossis thawj theem kev poob siab tshaj 0.25 MPa).
• Txo Kev Tsis Txais Ntsev: Cov dej ntws zoo zuj zus, nrog rau kev ntws ntsev ib txwm nce ntxiv 10% ~ 15%.

3. Cov Kev Daws Teeb Meem thiab Cov Txheej Txheem Ntxuav

Lub hauv paus ntsiab lus rau kev ua kom cov membrane fouling yog Ntxuav-Hauv-Qhov Chaw (CIP), uas suav nrog kev ntxuav lub cev thiab tshuaj lom neeg.

Kev Ntxuav Lub Cev

Feem ntau siv los tshem tawm cov khoom tsis huv ntawm qhov chaw ntawm daim nyias nyias (piv txwv li, cov khoom me me uas tsis huv). Nws yog kev ntxuav nrog dej ntshiab uas muaj qhov siab qis, ntws ceev, siv lub zog hydraulic shear los ntxuav cov khoom tsis huv. Kev ntxuav sib xyaw ntawm huab cua thiab dej kuj siv tau los txhim kho qhov zoo.

Kev Ntxuav Tshuaj

Yuav tsum xaiv cov tshuaj lom neeg tsim nyog rau kev ncig thiab kev ntub raws li hom kev qias neeg tshwj xeeb:

• Rau kev ntsuas inorganic: Siv cov tshuaj ntxuav acidic (piv txwv li, 0.2% ~ 1% citric acid lossis hydrochloric acid, pH tswj ntawm 2-3) kom yaj cov carbonates thiab cov hlau oxides tau zoo.
• Rau cov organic, colloids, thiab biological fouling: Siv cov tshuaj ntxuav alkaline (piv txwv li, 0.1% ~ 0.5% sodium hydroxide ua ke nrog surfactants lossis EDTA, pH tswj ntawm 10-12) kom yaj cov av nplaum thiab tshem tawm cov biofilms.
• Rau kev sib xyaw ua ke Fouling: Kev ntxuav alkaline feem ntau yog ua ua ntej kom tshem tawm cov organic/biological fouling, tom qab ntawd yog kev ntxuav acidic kom tshem tawm cov inorganic scaling.

Txheej Txheem Kev Ntxuav Txheem

1. Ua ntej ntxuav: Kaw lub kaw lus thiab yaug nrog lub siab qis nrog RO permeate kom ntws cov dej seem ntawm cov modules membrane.
2. Kev Npaj Tshuaj & Kev Muab Tshuaj: Npaj cov tshuaj ntxuav raws li qhov sib piv uas tau teev tseg. Tso nws rau hauv lub kaw lus ntawm qhov siab qis (feem ntau ≤0.2 ~ 0.3 MPa) thiab ntawm ib nrab ntawm qhov ntws ntxuav ib txwm muaj. Ua kom ncig mus rau 30-60 feeb.
3. Kev tsau: Nres kev ncig thiab cia cov tshuaj ntxuav ntub rau hauv daim nyias nyias rau ib lub sijhawm (piv txwv li, ncig rau 10 feeb, tom qab ntawd nres thiab ntub rau 5 feeb) kom tus neeg sawv cev nkag mus rau hauv txheej fouling tag nrho.
4. Tom qab ntxuav: Nqus cov tshuaj ntxuav thiab yaug lub kaw lus kom huv si nrog cov permeate kom txog thaum cov pH ntawm cov effluent tsis muaj zog thiab tsis muaj ua npuas ncauj lossis tsw ntxhiab.
5. Kev Txheeb Xyuas Kev Ua Tau Zoo: Rov pib dua lub tshuab kom sim ua haujlwm nrog qhov siab qis kom pom seb qhov dej ntws thiab kev tsis lees txais ntsev puas tau rov qab zoo dua li ntawm 90% ntawm cov nqi pib.

4. Cov Lus Qhia Txog Kev Tiv Thaiv thiab Kev Saib Xyuas Tsis Tu Ncua

• Optimize Pretreatment: Txhim kho cov txheej txheem ua ntej kho xws li kev coagulation, kev lim dej, thiab kev ua kom mos kom ntseeg tau tias cov dej pub Silt Density Index (SDI) yog
• Kev ntxuav lub cev tas li: Yog tias muaj xwm txheej zoo, ntxuav nrog lub zog qis thiab ntws sai txhua hnub. Qhov no zoo dua li tos kom cov av qias tuaj ua ntej ntxuav nrog tshuaj lom neeg.
• Kev Siv Tshuaj Kom Zoo: Muab cov tshuaj antiscalants, dispersants, thiab cov biocides tshwj xeeb rau hauv qhov ntau thiab tsawg raws li qhov zoo ntawm cov dej pub kom tiv thaiv kev loj hlob ntawm cov kab mob me me thiab cov kab mob me me.
• Kev Ua Haujlwm Txheem: Tsis txhob muab lub tshuab ua haujlwm ntau dhau. Ib txwm yaug lub tshuab ua ntej kaw kom tiv thaiv cov tshuaj lom kom tsis txhob nyob twj ywm rau ntawm qhov chaw ntawm daim nyias nyias.

⚠️ Cov kev ceev faj: Tsis txhob siv cov kua qaub lossis alkalis uas muaj zog ntau dhau, lossis ua kom lub sijhawm ntxuav ntev dua, vim qhov no yuav ua rau lub txheej membrane puas tsuaj mus tas li. Yog tias kev ntxuav online tsis ua haujlwm lossis muaj qhov qias neeg heev, xav txog kev tshem tawm cov khoom membrane rau kev ntxuav offline lossis hloov lawv tag nrho.