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Hotel wastewater can be utilized by microalgae Chlorella sp. as a source of nutrition for its growth so its reduce total nitrogen levels. One of the wastewater treatment processes that can increase the growth of microalgae is the Moving Bed Biofilm Reactor. In principle, Moving Bed Biofilm Reactor is suspended growth that is increased by adding biocarriers in the reactor as a place for the propagation of microorganisms, so there are two treatment process happened inside, suspended growth and attached growth. The purposes of this research is to know the effect of biocarrier Kaldnes 1 (K1)) filling volume to decreasing organic content in hotel wastewater. This study conducted in batches by varying of Kaldnes 1 (K1)), Kaldnes 1 (K1) filling volume as many as 10%, 20%, and 30% (wastewater volume). The processing is carried out for 5 days with solar irradiation in the MBBR. The treatment with 20% Kaldnes 1 (K1) filling volume was able to reduce total nitrogen with 91,96% removal efficiency at the best removing contact time, happened in days-5.

PENYISIHAN NITROGEN TOTAL DALAM LIMBAH CAIR HOTEL DENGAN SISTEM MOVING BED BIOFILM REACTOR MENGGUNAKAN Chlorella sp.