(1) Hauv qab ntawm cov khoom siv npias yog tapered los pab txhawb kev tawm ntawm cov poov xab txhua lub sijhawm thaum lub sijhawm tsim khoom.
(2) Lub fermenter ntawm npias cov cuab yeej muaj cov cuab yeej ua kom txias, thiab qhov kub ntawm fermentation yog yooj yim los tswj, yog li lub sij hawm fermentation yuav luv, lub caij nyoog ntawm cov kab mob paug tsawg dua, thiab cov khoom siv tes ua npias zoo yog ruaj khov.
(3) Cov kua fermentation hauv cov khoom siv npias yuav tsim cov pa roj carbon dioxide gradient vim qhov siab ntawm cov kua. Thaum ntsuas kub, cov kua fermentation yuav tsim convection. Qhov kev siv ntawm convection yuav ua kom muaj zog nrog qhov nce ntawm fermenter, thiab kev siv ntawm convection yuav txhim kho lub peev xwm fermentation ntawm poov xab, ua kom lub fermentation ceev thiab luv lub sij hawm fermentation.
(4) Lub conical tank tsim cov khoom siv npias tuaj yeem siv rau hauv qab fermentation thiab sab saum toj fermentation.
