Journal
BIORESOURCE TECHNOLOGY
Volume 102, Issue 2, Pages 1468-1474Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2010.09.089
Keywords
Composting; Swine manure; NH3/N2O/NO; Struvite; Nitratation
Funding
- Ministry of Education, Culture, Sports, Science and Technology of Japan [20780235]
- Ministry of Agriculture, Forestry and Fisheries of Japan [BM-D3120]
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To reduce nitrogenous emissions from composting, two different countermeasures were applied simultaneously in swine manure composting. One was forming struvite by adding Mg and Pat the start of composting, and the other was to promote nitratation (nitrite being oxidized nitrate) by adding nitrite-oxidizing bacteria after the thermophilic phase of composting. In the laboratory- and mid-scale composting experiments, 25-43% of NH3, 52-80% of N2O and 96-99% of NO emissions were reduced. From the nitrogen balance, it was revealed that the struvite formation reduced not only NH3, but also other nitrogenous emissions except N2O. The amount of total nitrogen losses was reduced by 60% by the two combined countermeasures, against 51% by the struvite formation alone. However, the nitratation promotion dissolved struvite crystals due to the pH decline, diminishing the effect of struvite as a slow-release fertilizer. (C) 2010 Elsevier Ltd. All rights reserved.
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