Isolasi Dan Pemanfaatan Bakteri Proteolitik Untuk Memperbaiki Kualitas Limbah Cair Pengolahan Bandeng Presto (Isolation and Utilization of Proteolytic Bacteria to Improve the Quality of Milkfish Presto Processing Wastewate)

摘要

In this research, isolation of proteolytic bacteria was performed to obtain isolates with high proteolytic activity based on their ability to degrade the protein. The best isolate was examined for their growth ability and proteolytic activity in different concentrations of NaCl and degree of acidity (pH). Furthermore, the isolate ability to improve wastewater quality was observed in milkfish presto processing wastewater. Thirty-six proteolytic bacteria were isolated from fish washing wastewater of Kranggan Market, Yogyakarta. Isolate D61 has the highest proteolytic activity with activity about 20,5 mm. Isolate D61 was able to grow at a concentration of 0-10% NaCl with the highest proteolytic activity at the concentration of 0-2% NaCl. Isolate D61 was also able to live at pH 5-10 with the highest proteolytic activity at pH 7-8 and pH 10. Based on morphology and biochemical characteristics, D61 has 93.93% similarity with Bacillus soli. However, isolate D61 was not able to improve the quality of milkfish presto processing wastewater.