Pengaruh Hydraulic Retention Time (HRT) Dan Laju Pengadukan Tahap Metanogenesis Dari Digestasi Anaerob VFA Dari Limbah Cair Pabrik Kelapa Sawit (LCPKS) untuk Memproduksi Biogas Pada Temperatur Atmosferi

Abstract

Methanogenesis process is the final process of anaerobic digestion second stage to produce biogas as the final product. This study aimed to obtain the effect of variation Hydraulic Retention Time (HRT) and the stirring rate and to get the best conditions in the process of methanogenesis with raw materials VFA effluent results of the previous stage in the process asidogenesis atmospheric circumstances. The process of loading-up is done by varying HRT then the target operating performed by varying the stirring rate fermenter Continuous Stirred Tank Reactor (CSTR), the rate of stirring 250; 200; 150 and 100 rpm with pH kept constant in the range of 6.8 to 7.6. Analysis solids (TS, VS, TSS and VSS), and COD conducted to assess changes in organic compounds degraded into biogas. The highest biogas yield achieved on stirring rate of 200 rpm variations in the amount of 172.05 L / Kg ΔCOD.day with concentration of methane (CH4), carbon dioxide (CO2) and trace hydrogen sulfide (H2S) respectively by 88.3%, 11 , 7% and 0.0013%. VS degradation and COD removal respectively by 50.62% and 49.10%