MBBR yog ib hom tshiab ntawm biofilm reactor, uas yog ib qho kev txhim kho tshiab ntawm cov khoom siv biofilm reactor tsim los ntawm lub txaj ruaj khov reactor, fluidized txaj reactor thiab biofilm lim. Nws kov yeej qhov tsis txaus ntawm lub txaj ruaj khov reactor uas yuav tsum tau rov qab ntxuav tsis tu ncua, lub txaj fluidized reactor yuav tsum tau fluidize cov cab kuj, thiab cov lim dej hauv lub tshuab nqus dej ntsaws cov khoom lim dej thiab hloov cov aerator, thiab khaws cov yam ntxwv ntawm cov txheej txheem biofilm ib txwm muaj. shock load, tsawg sludge ntau lawm thiab ntev sludge hnub nyoog. Piv nrog rau cov txheej txheem activated sludge, vim lub hnub nyoog ntev ntawm cov sludge, nws tuaj yeem khaws cov kab mob nitrifying ntau dua thiab muaj cov nyhuv denitrification zoo dua. Lub hauv paus ntsiab lus tseem ceeb yog siv cov dej phwj tuaj mus txuas ntxiv los ntawm lub reactor packing carrier, tsim ib biofilm ntawm cov cab kuj, thiab cov kab mob yuav sib npaug thiab loj hlob ntawm biofilm thaum degrading cov organic paug hauv cov dej phwj tuaj, thiaj li ua lub luag haujlwm ntawm purifying cov dej phwj tuaj.