Biological pretreatment of non-flocculated sludge augments the biogas production in the anaerobic digestion of the pretreated waste activated sludge

Environmental Technology
J MerrylinJ Rajesh Banu

Abstract

High-efficiency resource recovery from municipal solid waste (MSW) has been a focus of attention. The objective of this research is to develop a bio-pretreatment process for application prior to the anaerobic digestion of MSW to improve methane productivity. Bacillus licheniformis was used for pretreating MSW (non-flocculated with 0.07% citric acid), followed by anaerobic digestion. Laboratory-scale experiments were carried out in semi-continuous bioreactors, with a total volume of 5 L and working volume of 3 L. Among the nine organic loading rates (OLRs) investigated, the OLR of 0.84 kg SS m(-3) reactor day(-1) was found to be the most appropriate for economic operation of the reactor. Pretreatment of MSW prior to anaerobic digestion led to 55% and 64% increase of suspended solids (SS) and volatile solids reduction, respectively, with an improvement of 57% in biogas production. The results indicate that the pretreatment of non-flocculated sludge with Bacillus licheniformis which consumes less energy compared to other pretreatment techniques could be a cost-effective and environmentally sound method for producing methane from MSW.

References

Jan 11, 2001·Applied Microbiology and Biotechnology·L BjörnssonB Mattiasson
Dec 3, 2005·Waste Management·Edgar Fernando Castillo MA Victor Arellano
Mar 10, 2007·Waste Management & Research : the Journal of the International Solid Wastes and Public Cleansing Association, ISWA·Md Wahid Murad, Chamhuri Siwar
Sep 30, 2008·Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering·Azize AyolErsan Kuzyaka
Nov 19, 2011·Journal of Environmental Monitoring : JEM·Richard J C Brown, Peter T Woods

❮ Previous
Next ❯

Citations

Mar 31, 2016·Environmental Science and Pollution Research International·Parvathy EswariJ Rajesh Banu
Jul 18, 2018·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Qingfang ZhangZengye Yang
Apr 28, 2016·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Liang GuoZonglian She
Feb 28, 2019·Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering·Klaudiusz GrübelMiroslav Černík

❮ Previous
Next ❯

Software Mentioned

Polymath

Related Concepts

Related Feeds

Biofuels (ASM)

Biofuels are produced through contemporary processes from biomass rather than geological processes involved in fossil fuel formation. Examples include biodiesel, green diesel, biogas, etc. Discover the latest research on biofuels in this feed.