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| Influence of straw pretreatment on the thermophilic composting process with pig manure |
| Received:December 15, 2017 |
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| KeyWord:rice straw;biological pretreatment;chemical pretreatment;compost maturity;compost quality |
| Author Name | Affiliation | E-mail | | WANG Yan | College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China
Key Laboratory of Arable Land Conservation(Middle and Lower Reaches of Yangtze River), Ministry of Agriculture, Wuhan 430070, China
The Cooperative Innovation Center for Sustainable Pig Production, Wuhan 430070, China | | | LI Nian-nian | College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China | | | ZHU Duang-wei | College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China
Key Laboratory of Arable Land Conservation(Middle and Lower Reaches of Yangtze River), Ministry of Agriculture, Wuhan 430070, China
The Cooperative Innovation Center for Sustainable Pig Production, Wuhan 430070, China | | | ZHOU Wen-bing | College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China
Key Laboratory of Arable Land Conservation(Middle and Lower Reaches of Yangtze River), Ministry of Agriculture, Wuhan 430070, China
The Cooperative Innovation Center for Sustainable Pig Production, Wuhan 430070, China | | | CHEN Yan-xin | College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China
The Cooperative Innovation Center for Sustainable Pig Production, Wuhan 430070, China | | | WU Yu-peng | College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China
Key Laboratory of Arable Land Conservation(Middle and Lower Reaches of Yangtze River), Ministry of Agriculture, Wuhan 430070, China
The Cooperative Innovation Center for Sustainable Pig Production, Wuhan 430070, China | wyp19851205@126.com |
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| Abstract: |
| Breaking up the complex structure of lignocelluloses in straw by using pretreatment technology is an effective method for accelerating straw decomposition. Thus, in the present study, rice straw was pretreated by a straw decomposing agent (B) and calcium hydroxide (C), for 10 days (B1, C1), and 20 days (B2, C2). Rice straw without pretreatment was set as the control (CK). The above straw was then mixed with pig manure for the thermophilic composting process. Infrared spectroscopy (IR) and scanning electron microscopy (SEM) showed that the cell wall and fiber structure of rice straw was destroyed by the straw decomposing agent, leading to the exposure of internal tissues, and generating micro-pores on the straw. However, lesser internal tissues were exposed, and fewer micro-pores were generated, on straw pretreated with calcium hydroxide. Overall, pretreatment with the straw decomposing agent for 20 days showed the most destructive effects on rice straw. Compared with the control, the period of high temperature can be shortened by 8~13 days after pretreatment with the straw decomposing agent. At the end of composting, the pH in all the pretreated compost was below 8.5; NH4+-N/NO3--N of B1, B2, and C2 was less than 0.5 and met the requirements of the maturity evaluation standard. The T values[(C/N at the beginning of composting)/(C/N at the end of composting)] of B1, C1, and C2 were less than 0.6. Pretreated straw showed a higher total nutrient content than CK, and B2 showed a significantly higher total nutrient content than all the other treatments. In summary, straw pretreatment can accelerate the composting process and improve the quality of composting products. Pretreatment with the straw decomposing agent for 20 days showed the best results. |
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