Abstract
Tofu liquid waste contains a high organic load so that the processing system is needed to reduce the pollutant parameters in the wastewater to fulfill the quality standards. The most suitable treatment for organic loads is anaerobic processing. One anaerobic processing system uses the Hybrid Upflow Anaerob Sludge Blanket (HUASB) reactor with the consideration that this reactor has the advantage of maintaining high amounts of biomass concentrations, high load rates for operation, good deposition capability, and good solid-liquid separation due to appropriate granulation. The purpose of this study was to determine the effect of adding trace metal FeCl3 to the removal of COD, TSS and biogas production on tofu wastewater treatment at the HUASB reactor. The process of tofu wastewater treatment with the addition of trace metal in the HUASB reactor using a batch circulation system with a reactor volume of 9 liters. The reactor is operated by variations in the concentration of tofu wastewater (75 and 100%) and trace metal concentrations (0.3-0.6 mg / L). The parameters observed in this study were pH, COD, TSS, and biogas produced. The results showed that the optimum biogas production of 8.190 mL at the concentration of tofu wastewater was 75% with the concentration of trace metal 0.6 mg/L and allowance for COD and TSS of 94.09% and 94.02%.
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