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| Influence of biochar on the aerobic compost of pig manure |
| Received:October 23, 2018 |
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| KeyWord:pig manure;aerobic compost;sludge biochar;pig manure biochar;physicochemical properties |
| Author Name | Affiliation | E-mail | | XIE Sheng-yu | CAS Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
University of Chinese Academy of Sciences, Beijing 100049, China | | | YU Guang-wei | CAS Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China | gwyu@iue.ac.cn | | PAN Lan-jia | CAS Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
University of Chinese Academy of Sciences, Beijing 100049, China | | | LI Jie | CAS Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
University of Chinese Academy of Sciences, Beijing 100049, China | | | WANG Gang | CAS Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
University of Chinese Academy of Sciences, Beijing 100049, China | | | YOU Fu-tian | CAS Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China | | | LI Chun-xing | CAS Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China | | | WANG Yin | CAS Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China | | | WANG Qi-chuan | Chaimihe Agriculture Science and Technology Development Co., Ltd, Huai'an 223002, China | |
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| Abstract: |
| In this work, we used sludge and pig manure biochars as additives for the aerobic compost of pig manure to study their effects on temperature, pH, electrical conductivity (EC), nutrient content, and heavy metals during composting. Our results showed that the temperature of the compost pile added with sludge biochar reached 50℃ on Day 10, faster than the control, which reached that same temperature on Day 12. However, the compost with sludge biochar addition did not meet the hygienic requirements for the harmless disposal of night soil (GB 7959-2012), due to its short residence time in the thermophilic phase. On the other hand, the temperature of the pile added with pig manure biochar reached 50℃ on Day 4, reaching its maximum at 66.2℃ (a higher temperature than the 63.4℃ of the control) and satisfying the GB 7959-2012. The concentration of soluble salts in the two piles was reduced by adding sludge biochar and pig manure biochar, respectively. The addition of pig manure biochar reduced the loss of ammonium nitrogen and promoted an increase in available potassium in the compost pile, while the addition of sludge biochar had the opposite effect. Furthermore, the addition of sludge and pig manure biochars in the compost increased the residual fractions of Cr and Cu:from 93.82% and 36.78% in the control, they reached 94.44% and 41.94% with the addition of sludge biochar, and 94.27% and 60.26% with the addition of pig manure biochar, respectively. These results indicated that the addition of sludge and pig manure biochars improved the immobilization of Cr and Cu in the compost products. Moreover, the addition of pig manure biochar could reduce the potential ecological risk of compost products. Overall, pig manure biochar is more effective when it is added to the compost, compared with sludge biochar, and it can be used as a suitable compost additive. |
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