The unicellular form of Chlorella sp. grows quite well in treated swine wastewater under normal algal culturing conditions. The amount of biomass reaches the normal range( 100-260m g/L) within a short period (2-4 days). However, the suitable detention time that gives the maximum Chlorella sp.
removal efficiency and Moina macrocopa production was found to be 2 days. The efficiency of Chlorella sp. removal increased when the starting algal biomass
concentration was increased from 100 mglL to 260 mg/L. On the other hand, it did not change after varying the starting number of Moina macrocopa from 1,500 org./L to 3,000 org,/L (P-value > 0.05). The highest efficiency occurred when
Chlorella sp. concentration was one milligram per 12 organisms of Moina macrocopa. The characteristics of swine effluent, including suspended solids, OD56 and COD, were better than the effluent standard It is recommended that this culturing system is incorporated into the final stage of the wastewater treatment process. The condition of applying 300 g wet weight of Moina macrocopa
for one cubic meter of wastewater (3 ,000o rg./L) which has dense algal biomass
concentration (1 00- 260 mglL) would yield both the highest wastewater treating efficiency and the maximum Moina macrocopa production within 2 days.