An integrated anaerobic system for on-site treatment of wastewater from food waste disposer
- 41 Downloads
In this study, an integrated system of siphon-driven self-agitated anaerobic reactor (SDSAR) and anaerobic fixed bed reactor (AFBR) was conducted for the treatment of wastewater from food waste disposer (FWD), and the effect of influent total solids (TS) concentration on the process performance was evaluated. When the influent TS concentration increased from 7.04 to 15.5 g/L, the methane gas production rate increased from 0.45 to 0.92 L-CH4/L/day. However, with the influent TS concentration of food waste (FW) further increased to 23.5 g/L, a large amount of scum formed and accumulated in the SDSAR. According to the result of chemical oxygen demand (COD) recovery, the proportion of COD remained in the effluent at different TS concentrations was only around 2%. On the other hand, with an increase in TS concentration, the proportion of COD remained in the reactors increased significantly. Our results demonstrated that effluent from the integrated system can meet the water quality requirements recommended by Japan Sewage Works Association (JSWA) for wastewater from FWD. In addition, to enhance the process stability, the influent TS concentration should be maintained below 15.5 g/L.
KeywordsBiogas Total solids Anaerobic digestion Siphon-driven self-agitated anaerobic reactor (SDSAR) Anaerobic fixed bed reactor (AFBR)
This work was conducted as a part of the Sustainable Material Cycles Research Program - Project Five: “Development of Next Generation Technologies for 3 “R”- supported by the National Institute for Environmental Studies, Japan.
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interest.
- APHA (2012) Standard methods for the examination of water and wastewater. American Public Health Association, Washington, DCGoogle Scholar
- FAO (2011) Global food losses and food waste-extent, causes and prevention. Food and Agricultural Organization, Executive Summary, Rome. http://www.fao.org/3/a-i2697e.pdf. Accessed 26 Sep 2016
- Karmee SK (2016) Liquid biofuels from food waste: Current trends, prospect and limitation. Renew Sust Energ Rev 53: 945–953Google Scholar
- Kuruti K, Begum S, Ahuja S, Anupoju GRG, Juntupally S, Gandu B, Ahuja DK (2017) Exploitation of rapid acidification phenomena of food waste in reducing the hydraulic retention time (HRT) of high rate anaerobic digester without conceding on biogas yield. Bioresour Technol 226: 65–72Google Scholar
- SWMD (2005) Report on Evaluating Garbage Grinder Introduction: Guideline for Assessment of Garbage Grinder Introduction. Sewerage and Wastewater Management Department, City and Regional Development Bureau, Ministry of Land, Infrastructure and Transport, Japan. In Japanese. http://www.mlit.go.jp/kisha/kisha05/04/040727/07.pdf. Accessed 5 Oct 2018
- Zhang L, Jahng D (2012) Long-term anaerobic digestion of food waste stabilized by trace elements. Waste Manag 32:1509–1515Google Scholar