<![CDATA[Abstract The butchery liquid waste is rich in nitrate and phosphate and it need to be processed before being flown to the environment. To understand the effectiveness of combined anaerob-aerob biofilter in reducing the nitrate and phosphate content in the butchery liquid waste, a study was conducted in March – April 2018. The waste (315 L) was treated using a batch system that was consisted of 2 aerob and 2 anaerob tanks. The butchery liquid waste was kept for 10 days in anaerobtanks, 7 days in aerob tanks. By the end of the experiment, the nitrate reduced from 39 mg/l to 12.4 mg/l (the effectiveness was83.21%). While the phosphate reduced from 15.4 mg/l to2.9 mg/l (the effectiveness was 81.16%). Other water quality parameters such as pH was normal and DO was improved (from 1 mg/L to 5 mg/L). The treated waste was used as a mediafor culturingH. pluvialis. Observations of H. pluvialiswere conductedfor 8 days. The H.pluvialis density peaked by the 6th day, it was963,33 cells / ml. Based on data obtained, it can be concluded that the useof anaerob -aerob biofilter was effective forimproving the butchery waste water quality . Keyword : Organic waste, Anaerob tank, Aerob tank, Haemotococcus pluvialis ]]>
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