It was concluded that (1) Chlorella sp. (UM6151) is the most robust algal strain for the treatment of meat processing wastewater; (2) the lack of one or more nutrients is considered as the bottleneck to algae growth on individual wastewater, except KILL; (3) mixed wastewaters had positive synergetic effects on algae growth; (4) mixing wastewater is an economic and efficient way to balance the nutrient profile and improve algae growth and nutrient removal efficiency in wastewater.