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| Effect of phosphogypsum addition on the rice husk and oil cake composting process and evaluation of its physicochemical character as a substrate |
| Received:October 28, 2017 |
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| KeyWord:phosphogypsum;rice husk;oil cake;composting;substrate utilization |
| Author Name | Affiliation | E-mail | | CHEN Xue-jiao | College of Resource and Environmental Science, Yunnan Agricultural University, Kunming 650201, China | | | WANG Yu-yun | College of Resource and Environmental Science, Yunnan Agricultural University, Kunming 650201, China | | | XU Zhi | College of Resource and Environmental Science, Yunnan Agricultural University, Kunming 650201, China | xuzhi9910@126.com | | ZHAO Qian-xu | College of Resource and Environmental Science, Yunnan Agricultural University, Kunming 650201, China | |
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| Abstract: |
| In this study, rice husk and oil cake were used as main raw composting materials, and different proportions of phosphogypsum were added to study the effect on composting efficiency and compost quality as a substrate. The proportions added were 0, 10%, 20%, 30%, 40%, and 50% of the dry weight base. The six treatments were referred to as CK, A10, A20, A30, A40, and A50. The results showed that the addition of phosphogypsum was beneficial for rapid temperature increase and retaining this temperature for a long time. However, the thermophilic phase was shortened when the added dose of phosphogypsum was over 40%. The content of water-soluble NH4+-N, the C/N ratio, the TC/N value(the ratio of C/N in different periods from the beginning of composting process), and the germination index(GI) during the composting process were used to comprehensively evaluate the composting efficiency. The results indicated that the addition of phosphogypsum could promote the fermentation process during composting, especially for the A40 treatment. As substrates, the total phosphorus and total potassium contents were significantly higher in the A40 treatment than for the other treatments, and the bulk density, water-holding porosity, and ventilatory porosity of the composting mass met the requirements of an ideal substrate. |
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