Journal
INTERNATIONAL BIODETERIORATION & BIODEGRADATION
Volume 119, Issue -, Pages 429-436Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ibiod.2016.09.016
Keywords
C/N ratio; Compost; Enzymatic activity; Heavy metal; Speciation; Pig manure
Funding
- Department of Science & Technology of Hunan Province of China [2014GK1012]
- International S&T Cooperation Program of China [2015DFG92750]
- National Scientific and Technological Supporting Project of China [2012BAJ21B01-02]
- Free Exploration Foundation of State Key Laboratory of Environmental Criteria and Risk Assessment
- National Natural Science Foundation of China [50778066, 51278464, 51478172]
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The aim of this study was to investigate the effects of initial C/N ratio (15, 20, 25) and bulking agent on speciation of Zn and Cu and enzymatic activities (dehydrogenase, urease) during pig manure composting. Rice straw and maize straw were separately chosen as bulking agent. Results showed that maize straw addition greatly enhanced organic matter (OM) degradation. The final NH4+-N/NO3--N ratio in composting mixture with initial C/N ratio of 25 did not exceed the limit of 0.16 to be considered the index of mature compost. The composting mixture with initial C/N ratio of 25 could reduce the mobility of Cu and Zn, and 90% of Cu belonged to residual fraction in the final compost, while total contents for Zn and Cu increased by 112.8-192.7% and 115.5-132.6%, respectively. In addition, the composting mixture with initial C/N ratio of 25 accelerated the decline of urease activity than those in composting mixtures of initial C/N ratio of 15 and 20, and C/N ratio could affect urease activity by influencing the content of metal ions. Therefore, the final compost with initial C/N ratio of 25 was of low risk and high quality for land application. (C) 2016 Elsevier Ltd. All rights reserved.
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