(1) Raws li lub xeev ntws ntawm cov kua sib xyaw hauv lub tank aeration, nws tuaj yeem muab faib ua peb hom: thawb hom, ua tiav hom sib xyaw thiab sib xyaw ua ke;
(2) Raws li hom aeration, nws tuaj yeem muab faib ua blast aeration tank, mechanical aeration tank thiab mechanical blast aeration tank siv ua ke nrog ob;
(3) Raws li cov duab ntawm lub aeration tank, nws muaj peev xwm muab faib ua plaub hom: rectangular corridor, round, square thiab annular runway;
(4) Raws li kev sib raug zoo ntawm lub aeration tank thiab lub thib ob sedimentation tank, nws tuaj yeem muab faib ua ob hom: kev sib koom ua ke (piv txwv li, aeration sedimentation tank) thiab kev tsim kho.