Bioreaktor Hybrid Anaerob Dua Fasa Untuk Biokonversi Limbah Cair Pabrik Kelapa Sawit

Abstract

Anaerobic hybrid bioreactor configuration in converting the liquid waste content of high organic materials can be done with a single-phase configuration and two-phase configuration. In a single-phase anaerobic hybrid bioreactor, methanogenesis and acidogenesis take place in a single bioreactor. As a result it is somewhat difficult to control pH and low process stability. To overcome these weaknesses, the anaerobic hybrid bioreactor uses two phases. Condition of operation two-phase anaerobic hybrid bioreactor was conducted at room temperature and continuous. The hydraulic residence time in the bioreactor tested for acidogenesis ranged from 0.3, 0.5, 0.7, 1 day with COD loading rate ranges from 150, 100, 75 dan 50 kg/m³-day, while the hydraulic residence time in the bioreactor for methanogenesis was 1 day with COD loading rate of 50 kg/m³-day. Testing at high organic loading is done by the variable residence time the same of methanogenesis and acidogenesis bioreactors i.e 0.5, 0.7, 1 day with COD loading rate ranges from 150, 100, dan 50 kg/m³-day. The results showed that the hydraulic residence time was optimum at 1.5 days (0.5 days in acidogenesis phase and 1 day in methanogenesis phase) with a COD removal efficiency of 84 % is capable of removing COD by 92 kgCOD/m3-day with the quality of effluent at COD 8,000 mgCOD/L and the content of nutrients (NPK), which is relatively good and the acquisition of specific methane gas by 46 m3/kgCOD removed. In addition, system stability is relatively good with the ratio of volatile fatty acids and alkalinity of 0,052.