Reducing nitrate and total phosphate by using oxidation ditch with microalgae chlorella sp. Reactor

Abstract

Microalgae is a microscopic plant that has chlorophyll for carrying out photosynthesis. Chlorella sp. is one of the most easily found microalgae in the aquatic. Chlorella sp needs some nutrients such as nitrate and total phosphate for growing. There are many ways to develop microalgae, and an algae reactor is more effective on a large scale. Algae reactor has the same concept with oxidation ditch by using different microorganisms. This study applied an oxidation ditch reactor filled with microalgae Chlorella sp for treating domestic wastewater in terms of nitrate and phosphate concentration. Variation of rotational speed airbrush (45 and 60 rpm) and ratio volume of waste to microalgae (3:1, 4:1, 5:1, 6:1) were performed. The sample was collected for 5 days and measured for nitrate and phosphate concentration. The result shows that the optimum removal of nitrate and total phosphate is about 63.64% and 66.15%, respectively, with an under-speed variation of 60 rpm and a volume ratio of 3: 1. This study concludes that oxidation ditch reactor-filled microalgae Chlorella sp had performed an effective process in removing nitrate and total phosphate under optimum speed rotation and a low ratio of waste microalgae.