Volatile fatty acids (VFAs) production from swine manure through short-term dry anaerobic digestion and its separation from nitrogen and phosphorus resources in the digestate

Water Research
Weiwei HuangChuanping Feng

Abstract

The sustainability of an agricultural system depends highly upon the recycling of all useful substances from agricultural wastes. This study explored the feasibility of comprehensive utilization of C, N and P resources in swine manure (SM) through short-term dry anaerobic digestion (AD) followed by dry ammonia stripping, aiming at achieving (1) effective total volatile fatty acids (VFAs) production and separation; (2) ammonia recovery from the digestate; and (3) preservation of high P bioavailability in the solid residue for further applications. Specifically, two ammonia stripping strategies were applied and compared in this work: (I) ammonia stripping was directly performed with the digestate from dry AD of SM (i.e. dry ammonia stripping); and (II) wet ammonia stripping was conducted by using the resultant filtrate from solid-liquid separation of the mixture of digestate and added water. Results showed that dry AD of the tested SM at 55 °C, 20% TS and unadjusted initial pH (8.6) for 8 days produced relatively high concentrations of total VFAs (94.4 mg-COD/g-VS) and ammonia-N (20.0 mg/g-VS) with high potentially bioavailable P (10.6 mg/g-TS) remained in the digestate, which was considered optimal in this study. In addition, hi...Continue Reading

References

Feb 19, 2005·Analytical and Bioanalytical Chemistry·J J González MedeirosE Fernández Gómez
Aug 31, 2010·Bioresource Technology·Daniel MasséEdward Topp
Apr 10, 2013·Bioresource Technology·Lin LinJoo Hwa Tay
Jan 27, 2015·Waste Management·Chuang ChenZhan-Hui Fan
Mar 26, 2015·Bioresource Technology·Noori M Cata Saady, Daniel I Massé

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Citations

Dec 6, 2020·Water Environment Research : a Research Publication of the Water Environment Federation·Priyanka AliHaydée De Clippeleir
May 27, 2021·FEMS Microbiology Letters·F VelgheT Dietrich

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