Attachment characteristics of biofilms in fixed-lock media for swine wastewater treatment.
A correlation between equilibrium biofilm thickness and biomass density in a laboratory-scale submerged media aeration system was evaluated. The system had lock-type media, and swine wastewater was used as a substrate. The influent wastewater had chemical oxygen demand and biochemical oxygen demand concentrations of 2940-3800 and 1310-1730 mg/L, respectively. The hydraulic retention time of the system was varied from 0.5 to 2 days. The following conclusions can be drawn from the operational results: (i) the maximum biofilm density was observed when the equilibrium biofilm thickness was 180-200 microm, (ii) the activated biomass represented as volatile suspended solids per unit area decreased after 10 days of operation, and (iii) the removal rate of chemical oxygen demand increased rapidly up for an equilibrium biofilm thickness up to 200 microm, but no further increase was observed for thicknesses of 200-1200 microm.
Rim
Jay-Myoung
JM
Department of Environmental Engineering, Kangwon National University, Chunchon, Korea.
Kim
Byoung-Ug
BU
Kwon
Jae-Hyuk
JH
D000818:Animals; D018441:Biofilms; D018533:Biomass; D010100:Oxygen / Q000737:chemistry / Q000378:metabolism; D011157:Population Dynamics; D013552:Swine; D014835:Volatilization; D014865:Waste Disposal, Fluid / Q000379:methods*; D014872:Water Movements
D010100:Oxygen