Mechanical filtration yog txoj kev siv ntau tshaj plaws rau kev kho dej khib nyiab. Raws li cov khoom siv lim dej sib txawv, cov khoom siv kho tshuab pom tau muab faib ua ob pawg: granular media filtration thiab fiber filtration. Granular media filtration mas siv granular lim media xws li xuab zeb thiab gravel li cov lim nruab nrab. Kev lim dej yog ua tiav los ntawm adsorption ntawm granular lim xov xwm thiab khaws cia cov khib nyiab pov tseg hauv dej los ntawm qhov pores ntawm cov xuab zeb hais. Nws qhov zoo yog qhov yooj yim rov qab ntxuav, tab sis nws qhov tsis zoo suav nrog qeeb pom nrawm (feem ntau tsis tshaj 7 m / h), cov av tsis tshua muaj - tuav lub peev xwm (nws cov txheej txheem lim dej tsuas yog qhov saum npoo ntawm cov txheej lim), thiab tsis pom qhov tseeb (tsuas yog 20-40 μm), ua rau nws tsis tsim nyog rau kev lim dej ceev ceev nrog cov dej khib nyiab.
Lub siab -efficiency asymmetric fiber filter system siv asymmetric fiber bundle khoom raws li lim xov xwm. Cov xov xwm lim dej yog asymmetric fiber ntau, nrog rau cov tub ntxhais ntxiv rau ntawm lub hauv paus ntawm fiber ntau lim xov xwm, uas ua ke qhov zoo ntawm fiber ntau lim media thiab granular lim media. Vim yog cov qauv tshwj xeeb ntawm cov lim xov xwm, qhov porosity ntawm lub txaj lim tau sai sai ua cov gradient ntom nrog cov porosity loj nyob rau saum toj thiab me porosity nyob rau hauv qab, ua rau lub lim ceev, nrog ib tug loj interception peev, thiab yooj yim backwashing. Los ntawm kev tsim tshwj xeeb, cov txheej txheem ntawm cov tshuaj ntxiv, sib tov, flocculation, thiab pom tau ua nyob rau hauv ib lub reactor, ua kom cov cuab yeej siv tau zoo tshem tawm cov organic teeb meem hauv cov dej hauv dej thiab txo qis COD, ammonia nitrogen, nitrite, thiab lwm yam, thiab tshwj xeeb tshaj yog tsim rau lim cov khoom raug tshem tawm hauv cov dej ntws ntawm cov pas dej ib ntus.