Yadda ake magance RO membrane fouling

Membrane fouling yana nufin abin da ba za a iya jurewa ba wanda barbashi, ƙwayoyin colloidal, ko macromolecules mai solute a cikin maganin abinci a cikin hulɗa tare da adsorb na membrane da ajiya akan farfajiyar membrane ko pores saboda hulɗar jiki ko sinadarai tare da membrane, ko haɗin kai wanda ke haifar da wasu solutes don wuce su solubility da raguwar haɓakar ƙwayar cuta, yana haifar da haɓakar ƙwayar cuta a cikin ƙwayar cuta. halayen rabuwa.

Kwayoyin cuta

1) Dalilan samuwar sa

Gurɓataccen ƙwayar cuta yana nufin abin da ya faru inda ƙananan ƙwayoyin cuta ke taruwa a mahaɗar ruwa na membrane, wanda ke shafar aikin tsarin. Waɗannan ƙananan ƙwayoyin cuta suna haɓaka kuma suna girma ta amfani da membranes osmosis na baya a matsayin masu ɗaukar hoto da abubuwan gina jiki daga ɓangaren ruwa mai ƙarfi na juyi osmosis, suna samar da Layer biofilm akan saman murfin osmosis na baya. Wannan yana haifar da saurin haɓakar bambancin matsa lamba tsakanin mashigai da fitarwa na tsarin juyayin osmosis, saurin raguwar samar da ruwa da yawan raguwar ruwa, da gurɓatar ruwan samfurin. Biofilms kunshe da microorganisms iya kai tsaye (ta hanyar enzymatic mataki) ko a kaikaice (ta gida pH ko rage m) wulakantanta membrane polymers ko wasu reverse osmosis naúrar aka gyara, sakamakon a takaice membrane lifespan, lalacewa ga membrane tsarin mutunci, har ma da manyan kasawa tsarin.

2) Hanyar sarrafawa

Ana iya samun hanyar sarrafa gurɓatar halittu ta hanyar ci gaba da ba da fata da kuma lalata ruwan da ke shigowa. Ya kamata a shigar da na'urorin da ba su da amfani da su don ɗanyen ruwa da aka tattara daga ƙasa da ƙasa mara zurfi, sannan a ƙara chlorine fungicides. Matsakaicin gabaɗaya ya dogara ne akan ragowar abun ciki na chlorine a cikin tasirin wanda ya fi 1mg/L.

Yin lalata da sinadarai

1) Dalilan samuwarta

Abubuwan da ke haifar da gurɓacewar sinadarai sune shigar da sikelin carbonate a cikin sassan membrane, wanda galibi saboda rashin aiki, tsarin hana sikelin sikelin da bai cika ba, da katsewar sikelin mai hanawa yayin aiki. Idan ba a gano shi a cikin lokaci ba, al'amarin na ƙara yawan ƙarfin aiki, ƙara yawan matsa lamba, da rage yawan samar da ruwa zai faru a cikin 'yan kwanaki. Idan mai hana sikelin da aka zaɓa bai dace da ingancin ruwa ba ko kuma adadin bai isa ba, ƙima a cikin ɓangaren membrane shima zai faru. Za'a iya mayar da sikeli mai sauƙi a cikin sinadari na membrane zuwa aikinsa ta hanyar tsabtace sinadarai, kuma a lokuta masu tsanani, yana iya haifar da wasu gurɓatattun abubuwa na membrane.

2) Hanyar sarrafawa

Hanyar sarrafawa don hana ƙima a cikin kashi na membrane shine fara zaɓar mai hana sikelin sikelin osmosis mai dacewa don ingancin tushen ruwa na tsarin, da ƙayyade mafi kyawun sashi. Abu na biyu, ƙarfafa tsarin sa ido kan tsarin allurai, sa ido sosai kan sauye-sauyen canje-canje a cikin sigogin aiki, da gano musabbabin duk wani rashin daidaituwa. Bugu da kari, babban abun ciki na Fe3 + a cikin ruwa galibi yana haifar da tsarin bututun mai. Saboda haka, ya kamata a yi amfani da bututun filastik da aka yi da ƙarfe na ƙarfe kamar yadda zai yiwu don bututun tsarin, gami da bututun tushen ruwa, don rage abun ciki na Fe3 +.

Dakatar da ɓangarorin kwayoyin halitta da gurɓataccen gurɓataccen iska

1) Dalilan samuwarta

Dakatar da barbashi da colloids sune manyan abubuwan da ke toshe murfin osmosis na baya, kuma su ne kuma manyan dalilan da ke haifar da wuce gona da iri na SDI (sludge density index). Saboda bambance-bambance a cikin maɓuɓɓugar ruwa da yankuna, akwai gagarumin bambance-bambance a cikin abubuwan da aka dakatar da su da kuma colloid. Babban abubuwan da ke cikin ruwa mara gurɓatacce da ruwan ƙasa mara zurfi sune ƙwayoyin cuta, yumbu, silica colloidal, baƙin ƙarfe oxides, samfuran humic acid, kazalika da shigar da wuce gona da iri na coagulants da coagulants (kamar gishirin ƙarfe, salts aluminum, da sauransu) a cikin tsarin pretreatment. Bugu da kari, hazo da aka samu ta hanyar hada-hadar polymers masu inganci a cikin danyen ruwa da masu hana ma'auni mara kyau a tsarin tsarin osmosis shima yana daya daga cikin abubuwan da ke haifar da irin wannan gurbatar yanayi.

2) Hanyar sarrafawa

Lokacin da daskararrun abubuwan da aka dakatar da su a cikin ɗanyen ruwa ya wuce 70mg/L, ana amfani da coagulation, bayani, da kuma hanyoyin da za a iya tacewa; Lokacin da abubuwan da aka dakatar da su a cikin danyen ruwa bai wuce 70mg/L ba, ana amfani da tacewar coagulation yawanci don pretreatment; Lokacin da daskararrun abubuwan da aka dakatar da su a cikin ɗanyen ruwa bai wuce 10mg/L ba, ana amfani da hanyar tacewa kai tsaye. Bugu da ƙari, microfiltration ko ultrafiltration hanya ce mai tasiri mai mahimmanci don maganin turbidity da kwayoyin halitta maras narkewa wanda ya fito kwanan nan. Yana iya cire duk daskararrun da aka dakatar da su, ƙwayoyin cuta, mafi yawan colloids, da kwayoyin halitta maras narkewa, kuma shine kyakkyawan tsari na riga-kafi don juyar da tsarin osmosis.