Struvite Precipitation for Sustainable Recovery of Nitrogen and Phosphorus from Anaerobic Digestion Effluents of Swine Manure

Hong-Duck Ryu, Do Young Lim, Sun-Jung Kim, Un-Il Baek, Eu Gene Chung, Kyunghyun Kim and Jae Kwan Lee
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Hong-Duck Ryu: Water Environment Research Department, National Institute of Environmental Research, Hwangyoung-ro 42, Seo-gu, Incheon 22689, Korea
Do Young Lim: Water Environment Research Department, National Institute of Environmental Research, Hwangyoung-ro 42, Seo-gu, Incheon 22689, Korea
Sun-Jung Kim: Water Environment Research Department, National Institute of Environmental Research, Hwangyoung-ro 42, Seo-gu, Incheon 22689, Korea
Un-Il Baek: Water Environment Research Department, National Institute of Environmental Research, Hwangyoung-ro 42, Seo-gu, Incheon 22689, Korea
Eu Gene Chung: Water Environment Research Department, National Institute of Environmental Research, Hwangyoung-ro 42, Seo-gu, Incheon 22689, Korea
Kyunghyun Kim: Water Environment Research Department, National Institute of Environmental Research, Hwangyoung-ro 42, Seo-gu, Incheon 22689, Korea
Jae Kwan Lee: Water Environment Research Department, National Institute of Environmental Research, Hwangyoung-ro 42, Seo-gu, Incheon 22689, Korea

Sustainability, 2020, vol. 12, issue 20, 1-15

Abstract: In this study, we propose the application of struvite precipitation for the sustainable recovery of nitrogen (N) and phosphorus (P) from anaerobic digestion (AD) effluents derived from swine manure. The optimal conditions for four major factors that affect the recovery of N and P were derived by conducting batch experiments on AD effluents obtained from four AD facilities. The optimal conditions were a pH of 10.0, NH 4 -N:Mg:PO 4 -P molar ratio of 1:1.4:1, mixing intensity of 240 s −1 , and mixing duration of 2 min. Under these optimal conditions, the removal efficiencies of NH 4 -N and PO 4 -P were approximately 74% and 83%, respectively, whereas those of Cu and Zn were approximately 74% and 79%, respectively. Herein, a model for swine manure treatment that incorporates AD, struvite precipitation, and biological treatment processes is proposed. We applied this model to 85 public biological treatment facilities in South Korea and recovered 4722 and 51 tons/yr of NH 4 -N and PO 4 -P, respectively. The economic analysis of the proposed model’s performance predicts a lack of profitability due to the high cost of chemicals; however, this analysis does not consider the resulting protection of the hydrological environment. Field-scale studies should be conducted in future to prove the effectiveness of the model.

Keywords: swine manure; anaerobic digestion effluents; struvite precipitation; optimal condition; biological treatment process; application model (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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