Removal efficiency of microcystin(MC-RR) and microcystis cells by powdered activated carbon(PAC),ultrafiltration membrane(UF) and PAC-UF combination process was discussed.Results showed that adsorption capacity of PAC on MC-RR was0.23 μg/g,and isotherms could be simulated by Langmuir adsorption isotherm.Adsorption effect was proportional to dosage of PAC.In the initial stage of UF operation,removal rate of MC-RR was 8.5%,but the removal efficiency was decreased with the aggregation of microcystis cell on th...