Full-Scale Application of Up-flow High Rate Anaerobic Reactor with Substrate Modification and Effluent Recirculation for Sugarcane Vinasse Degradation and Biogas Generation
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Centre of Industrial Pollution Prevention Technology, Jl.Ki Mangunsarkoro No. 6, Semarang, Central Java, Indonesia
Laboratory of Environmental Science and Technology, The Xinjiang Technical Institute of Physics and Chemistry, Key Laboratory of Functional Materials and Devices for Special Environment, Chinese Academy of Science, Urumqi, 830011, China
Rustiana Yuliasni   

Centre of Industrial Pollution Prevention Technology, Jl.Ki Mangunsarkoro No.6, Semarang, Central Java, Indonesia
Publication date: 2021-04-01
J. Ecol. Eng. 2021; 22(4):314–324
This study was aimed to study the potential of biogas (methane) production from vinasse wastewater in real full-scale application using a two-stage sequencing Up-flow High Rate Anaerobic Reactor (UHRAR), with effluent recirculation and substrate modification. Batch experiment was initially conducted prior full-scale application experiment. Batch experiment was done with experimental condition variable: undiluted sample (pH 6) and diluted samples (pH: 5; 6 and 7). pH and methane production were observed for 50 days. Full-scale application was carried out in two-stage UHRAR reactors with volume 60 m3, HRT 40 d and OLR 60.1 – 104 kg COD/m3.d. Observation was lasted for 32 d. Result from batch experiment showed that diluted samples achieved higher COD degradation and methane generation than undiluted sample. The optimum condition occurred at pH 7, with theoretical methane yield of 7.51 – 10.64 L CH4 per kg COD. While in full scale application, at day 32, COD removal was 71% (69.1 kg COD/d removed), with methane production was 36.72 m3 CH4/d. Methane production per COD removed was 0.53 m3 CH4/kg COD.d. Substrate modification and effluent recirculation could improve the substrate biodegradability, maintain microbial diversity and enrich nutrients in the reactor.