Dab tsi yog qhov kawg lim dej?

Dead-end filtration yog hais txog lub hauv paus ntsiab lus pom ntawm cov khoom siv membranes. Feem ntau, tuag-kawg filtration sib raug mus rau kev sib tsoo pom.
Cov txheej txheem filtration uas tib neeg feem ntau nkag siab yog tias cov dej nkag mus dhau los ntawm cov lim membrane vertically, tawm hauv cov khoom thiab cov khoom raug tshem tawm ntawm daim nyias nyias. Tsuas muaj ib qho dej nkag thiab ib qho dej ntws tawm rau tag nrho cov kev pom. Qhov no yog qhov peb hu ua dead-end filtration.
Dead-end filtration txhais tau hais tias tag nrho cov khoom khaws cia yuav txuas ntxiv mus ntxiv rau ntawm daim nyias nyias. Yog tias nws tsis raug tshem tawm los yog ntxuav tsis tu ncua, xws li cov txheej txheem pom yuav tsum nres thaum tag nrho cov kev lim dej raug thaiv los ntawm cov khoom khaws cia.
Feem ntau ntawm cov tshuab ultrafiltration tam sim no siv hom kev pom no, tab sis tom qab lub sijhawm ua haujlwm, cov dej ntws los yog tshuaj ntxuav yuav tsum ua kom rov qab nws lub peev xwm pom.
Cov txheej txheem thim rov qab osmosis yog lwm txoj kev pom siv, uas yog: hla-ntws pom.
Nyob rau hauv cross-flow filtration, cov dej pub dej ntws tangentially (parallel) es tsis yog vertically hla daim nyias nyias raws li nyob rau hauv tuag-kawg pom; dej thiab ib feem me me ntawm cov kua nplaum dhau los ntawm daim nyias nyias raws li cov khoom siv dej, thaum feem ntau ntawm cov kua dej thiab ib feem ntawm cov dej ntws ncaj qha.
Cross-flow filtration yog li ntawd muaj ib tug inlet kwj thiab ob lub qhov hluav taws xob ntws, uas yog: cov khoom kwj thiab concentrate kwj. Concentrated dej ntws yog qhov sib txawv tseem ceeb ntawm kev sib tsoo thiab kev lim dej tuag. Nws zoo nkaus li txhais tau hais tias feem ntau ntawm cov khoom thiab cov khoom raug tshem tawm yuav raug tso tawm es tsis txhob tag nrho cov nyob rau ntawm daim nyias nyias.
Tsis tas li ntawd, txij li cov kev taw qhia ntws ntawm lub ntsiab aqueous tov ntawm cross-flow filtration yog tangential kev taw qhia thaum uas tig mus rau lub membrane nto, nws muaj peev xwm ua si lub luag hauj lwm nyob rau hauv scouring lub membrane nto, yog li ntawd cross-flow pom tau zoo txo ​​cov concentration polarization, Cov pa phem thiab scaling ntawm lub membrane nto tshwm sim ntawm qhov phenomenon.
Tau kawg, cov nyhuv dej ntws tawm yog cuam tshuam nrog cov dej ntws ntws tawm, uas yog vim li cas thiaj li muaj qhov xav tau tsawg kawg nkaus ntawm cov dej ntws hauv cov txheej txheem ntawm cov txheej txheem rov qab osmosis. Nyob rau hauv txoj kev xav, cross-flow filtration yog cov txheej txheem nruam pom, tab sis qhov tseeb nws tsis tuaj yeem tiv thaiv qhov fouling thiab fouling ntawm daim nyias nyias, yog li lub lim membrane tseem yuav tsum tau ntxuav tsis tu ncua off-line los kho nws cov flux.