In comparison with algae biomass (above 1.0 g/L) in artificial medium (Farooq et al., 2013 and Kumar and Das, 2012), that in most wastewater was much lower. Low biomass yield of algae on wastewater would reduce the economic profit and prevent the application of algae in wastewater treatment. To improve biomass yield, some methods, such as adding CO2, continuous feeding and so on, were used. For instance, algae biomass in municipal wastewater was improved to 1.5 g/L by continuous feeding (Zhou et al., 2012). However, adding CO2 and continuous feeding would increase the cost of infrastructure for algae production. Current research improved the biomass yield of algae by mixing different types of wastewater. In comparison with continuous feeding and adding CO2, mixing wastewater is low cost and the operation is simple.