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KMID : 1024520170260010119
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Journal of the Environmental Sciences
2017 Volume.26 No. 1 p.119 ~ p.131
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Recovery and Recycling of Nitrogen and Phosphorus as Struvite from Livestock Excreta
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Ryu Hong-Duck
Ahn Ki-Hong
Chung Eu-Gene
Kim Yong-Seok
Rhew Doug-Hee
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Abstract
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This study evaluated the feasibility of recovering and recycling nitrogen (N) and phosphorus (P) from livestock excreta as struvite (MgNH4PO4·6H2O) in South Korea. Our experimental results showed that struvite precipitation was a very effective way to recover N and P from livestock excreta. Moreover, our study demonstrated that struvite precipitates from livestock excreta (SPL) contain higher concentrations of N, P, and magnesium (Mg) as compared to compost and liquid manure from livestock excreta. In addition, although SPL contain high concentrations of copper (Cu) and zinc (Zn), they meet the fertilizer criteria for concentrations of heavy metals. In South Korea, SPL cannot currently be used as a fertilizer due to legal constraints. Legal permission for SPL use would offer greater choice in livestock excreta management. In conclusion, recovery and recycling of N and P from livestock excreta as struvite can be an effective tool for managing nutrients in livestock excreta.
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KEYWORD
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Livestock excreta, Struvite, Nitrogen, Phosphorus, Heavy metals, Fertilizer
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