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Molecules 2016, 21(8), 1011; doi:10.3390/molecules21081011

Struvite Precipitation as a Means of Recovering Nutrients and Mitigating Ammonia Toxicity in a Two-Stage Anaerobic Digester Treating Protein-Rich Feedstocks

1
College of Engineering, University of Georgia, Athens, GA 30602, USA
2
College of Agricultural and Environmental Sciences, University of Georgia, Athens, GA 30602, USA
*
Author to whom correspondence should be addressed.
Academic Editor: Rafał Bogel-Łukasik
Received: 2 July 2016 / Revised: 26 July 2016 / Accepted: 28 July 2016 / Published: 3 August 2016
(This article belongs to the Special Issue Green Biorefinery)
View Full-Text   |   Download PDF [1172 KB, uploaded 3 August 2016]   |  

Abstract

Accumulation of ammonia, measured as total ammonia nitrogen (TAN), a product of protein decomposition in slaughterhouse wastes, inhibits the anaerobic digestion process, reducing digester productivity and leading to failure. Struvite precipitation (SP) is an effective means to remove TAN and enhance the buffering of substrates. Different Mg and P sources were evaluated as reactants in SP in acidogenic digester effluents to reduce its TAN levels. In order to measure impact of TAN removal, a standard biochemical methane potential (BMP) test was conducted to measure methane yield from treatments that had the highest TAN reductions. SP results showed 6 of 9 reagent combinations resulted in greater than 70% TAN removal. The BMP results indicated that SP treatment by adding Mg(OH)2 and H3PO4 resulted in 57.6% nitrogen recovery and 41.7% increase in methane yield relative to the substrate without SP. SP is an effective technology to improve nutrient recovery and methane production from the anaerobic digestion of protein-rich feedstocks. View Full-Text
Keywords: struvite; anaerobic digestion; ammonia; precipitation; protein-rich wastes struvite; anaerobic digestion; ammonia; precipitation; protein-rich wastes
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Wang, S.; Hawkins, G.L.; Kiepper, B.H.; Das, K.C. Struvite Precipitation as a Means of Recovering Nutrients and Mitigating Ammonia Toxicity in a Two-Stage Anaerobic Digester Treating Protein-Rich Feedstocks. Molecules 2016, 21, 1011.

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