| Summary: | This research aims to identify the optimum concentration of chitosan solution and the effectiveness of chitosan as a biocoagulant in shrimp-washing wastewater on three types of water quality parameters, i.e., color, turbidity, and total dissolved solids (TDS). By employing the jar test method, the coagulation-flocculation test was performed by adding chitosan doses of 0 ppm (control), 50 ppm, 100 ppm, 150 ppm, 200 ppm, and 250 ppm, respectively. The effectiveness of chitosan was measured by calculating the percentage decrease in color, turbidity, and TDS parameters in the treated shrimp-washing wastewater samples. The statistical analysis results indicated that the treatment had a significant effect on the three types of parameters, with the obtained optimum concentration of chitosan solution of 200 ppm. The effectiveness of chitosan in reducing color (84%), turbidity (83%), and TDS (54%).
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