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| Effects of Sludge Biochar Based Compost on Properties and Remediation of Soil Contaminated by Manganese |
| Received:February 04, 2015 |
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| KeyWord:hydrothermal treated sludge;biochar;composting;microorganism;heavy metal bioavailability |
| Author Name | Affiliation | E-mail | | ZHANG Xiang | Key laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China | | | YU Zhen | Key laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China | | | CHANG Ken-lin | Key laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China | | | WANG Yin | Key laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China | yinwang@iue.ac.cn |
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| Abstract: |
| With the rapid urbanization, sewage sludge, an inevitable major byproduct of wastewater treatment, is being produced massively with dramatic increase and is thus required to be treated effectively. In this work, sewage sludge was converted into biochar through pyrolysis and then composted into a compost fertilizer with pig manure. Effects of sludge biochar on the composting and of sludge biochar based compost on the physic-chemical and microbial properties of a manganese-contaminated soil were investigated. Results show that the BET-surface and pH of sewage sludge biochar largely increased after pyrolysis. Addition of sludge biochar accelerated the composting process and improved the quality of the compost. Sludge biochar based composts significantly improved soil pH and electrical conductivity, increased bacterial and fungal community population, and enhanced activities of dehydrogenase and urease. Quantities of ammonia-oxidizing archaea and ammonia-oxidizing bacteria in soil were also increased by applying sludge biochar based composts. Applying sludge biochar based compost caused the partial conversion of acid-soluble manganese into residual fraction, decreasing the bioavailability of soil manganese, and in turn increased cabbage yield greatly. |
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