Optimum doses of Mg and P salts for precipitating ammonia into struvite crystals in aerobic composting
- Authors
- Jeong, YK; Hwang, SJ
- Issue Date
- Jan-2005
- Publisher
- ELSEVIER SCI LTD
- Keywords
- ammonia; composting; cumulative ammonia production; struvite crystals; magnesium salts; phosphate salts; TKN
- Citation
- BIORESOURCE TECHNOLOGY, v.96, no.1, pp.1 - 6
- Journal Title
- BIORESOURCE TECHNOLOGY
- Volume
- 96
- Number
- 1
- Start Page
- 1
- End Page
- 6
- URI
- https://scholarworks.bwise.kr/kumoh/handle/2020.sw.kumoh/21625
- DOI
- 10.1016/j.biortech.2004.05.028
- ISSN
- 0960-8524
- Abstract
- It was previously reported that struvite crystals could be formed in the aerobic composting reaction provided that Mg and P salts are added [Bioresource Technology 79 (2001) 129]. The formation of struvite crystals significantly reduced gaseous loss of ammonia and resulted in substantial increase in the ammonia content in the compost, attaining 1.5%. In this context, the present study was conducted to determine the optimal doses of Mg and P salts for struvite crystallization. It was found that cumulative ammonia production was about 33-36% of the initial total nitrogen in the aerobic composting reaction, irrespective of the amounts of Mg and P salts added. The theoretical doses for complete conversion of ammonia into struvite crystals seemed to be about 33-36% of the initial nitrogen. The addition of Mg and P salts at this level, however, caused adverse effects on the degradation of organic materials. Therefore, it was concluded that the optimal doses of Mg and P salts should be about 20% of the initial nitrogen in the compost mixture not to cause any harmful effects on the composting reaction. (C) 2004 Elsevier Ltd. All rights reserved.
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