Utilization of Dairy Industry Wastewater for Nutrition of Microalgae Chlorella vulgaris

This experiment utilized dairy industry wastewater, which is located in Sukabumi, West Java, Indonesia. The aim of this experiment was to evaluate the biomass production and dairy wastewater treatment using Chlorella vulgaris. The experiment lasted for 6 months (July - December 2019). Monthly water analyses for a variety of physical-chemical factors were also investigated. Microalgae were cultivated in a 10 m(3) raceway bioreactor type. The results indicated that a decrease in the concentration chemical substances of the wastewater, namely 74% N-amonia, 77% total nitrogen (TN), 78% total phosphate (TP), 92% Chemical Oxygen Demand (COD), and 77% Biological Oxygen Demand (BOD) within 10 days of the process. A maximum of 1.2 g/L dry biomass was obtained in 18 days. The percentage lipid content was determined by soxhlet extraction and was shown to be 25%. To sustain the growth of microalgae, it was necessary giving 3.5 mg NPK/L on the tenth day and then continuously added.