The role of C/N ratio on anaerobic decomposition of industrial tempeh wastewater for optimizing methane production

Fransiscus, Yunus and Simangunsong, Tuani Lidiawati (2022) The role of C/N ratio on anaerobic decomposition of industrial tempeh wastewater for optimizing methane production. In: IOP Conference Series: Earth and Environmental Science, Volume 963, International Bioprocessing Association Subject Conference (IBASC 2021), 4th-5th August 2021, Yogyakarta.

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Considering its high organic contents, biological process, in particular anaerobically decomposition is considered to be the most suitable treatment for industrial tempeh wastewater. Among the important parameters that determine the success level of process, C/N ratio was mentioned to play significant role. Thus, this study was carried out to investigate the effect of different C/N ratio (10; 20; 30 and 40) to the process decomposition to produce methane gas. The experiment was conducted using 1L batch reactors with sludge from active cow manure biogas digester as inoculum. Several parameters such as pH, COD, BOD, VFAs and methane gas were monitored during the process in order to understand the mechanism. The experimental results confirmed that C/N ratio significantly affected the anaerobic decomposition of tempeh wastewater giving the best achievement for C/N = 30, with organic removal as high as 89% (COD) and total methane produced as much as 1240 mL in 14 days of observation. The balance composition between carbon and nitrogen is important for anaerobic process, higher organic loading (C/N = 40) will potentially lead to VFAs accumulation meanwhile higher nitrogen concentration (C/N = 10) will stimulate complex transition mainly denitrification and free ammonia formation. Both conditions will block the methanogenesis stage, resulting in non-optimal decomposition process and minimum methane production.

Item Type: Conference or Workshop Item (Paper)
Subjects: T Technology > TD Environmental technology. Sanitary engineering
T Technology > TP Chemical technology
Divisions: Faculty of Engineering > Department of Chemical Engineering
Depositing User: Yunus Fransiscus 61118
Date Deposited: 03 Dec 2021 02:49
Last Modified: 02 Feb 2023 09:27

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