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Palm oil industries has been developing quickly in Riau Province. Right now, at least, 246 palm oil industries present in through around of district in Riau Province. They discharges not only liquid waste in vast amount but also solid and gas. Thy liquid waste is rich in micro and macro nutrient that can be used as culture medium of microalgae (Chlorella sp). The study of utilization of wastewater from oil palm industry as culture medium for microalgae (Chlorella sp) that can be used as supplement food for calves in Riau Province was conducted from July to August 2017. Result of this study indicated that supplement food of Chlorella powder can promote the growth and production of calves in Riau Province. After 12 weeks calves cultured in the cattle, the mean weight of them increased from 125,0 kg to 150,0 or increased as much as 25 kg compared by without supplement food was 115.6 kg in initial study to 129.0 kg after 12 weeks or increased only 13.4 kg. based on this study, it concluded that wastewater from palm oil industry can promote the growth and production of Chlorella sp that can be used as supplement food for calves in Riau Province

The Utilization of Wastewater from Palm Oil Industry As Culture Medium for Microalgae (Chlorella sp) That Can be Used As Supplement Food for Calves in Riau Province