Synergistic effect and supernatant nitrogen reduction from anaerobic co-digestion of sewage sludge and pig manure

The degradation kinetics of anaerobic co-digestion of pig manure (PM) and sewage sludge (SS) were investigated for a utility that has concerns on nitrogen in the digestate return stream. In this study, batch-scale anaerobic reactors were set up with SS/PM volatile solids (VS) ratios at 7:1, 14:1, 21:1, and mono-digestions of SS and PM. PM (239 mL/g VS added) produced more methane than SS (182 mL/g VS added). As a result, increasing PM in co-digestion also increased methane yield. Kinetic models indicated synergistic effects by co-digestion with a faster degradation rate, an increased cumulative methane yield, and a shortened digestion time. Despite total nitrogen increased in digestate, the total nitrogen in co-digestion supernatant was lowered, which interprets to a nominal impact to the mainstream treatment with the additional PM loading. Nitrogen content in dewatered biosolids is expected to increase between 39.5%–53.5% thus benefiting land application.

© This manuscript version is made available under the CC-BY-NC-ND 4.0 license https://creativecommons.org/licenses/by-nc-nd/4.0/

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Work Title Synergistic effect and supernatant nitrogen reduction from anaerobic co-digestion of sewage sludge and pig manure
Access
Open Access
Creators
  1. Xuanye Bai
  2. Yen-Chih Chen
License CC BY-NC-ND 4.0 (Attribution-NonCommercial-NoDerivatives)
Work Type Article
Publisher
  1. Elsevier BV
Publication Date June 2020
Publisher Identifier (DOI)
  1. 10.1016/j.biteb.2020.100424
Source
  1. Bioresource Technology Reports
Deposited July 01, 2022

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  • Added Chen codigestion SS PM accepted manuscript 2020-1.pdf
  • Added Creator Xuanye Bai
  • Added Creator Yen-Chih Chen
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