Sludge is a secondary pollutant produced by sewage treatment plants and is rich in nutrients such as organic matter, nitrogen, phosphorus, and potassium. However, sludge also contains a lot of harmful substances such as heavy metals, organic pollutants and pathogenic microorganisms. Among them, heavy metals are regarded as important bottleneck factors for the safe disposal of sludge. Therefore, how to effectively solidify the heavy metals in the sludge is the focus of the research on sludge resource utilization.
Based on this, the Clean Energy Technology and Carbon Materials Research Group (Wang Yin team) of the Institute of Urban Environment, Chinese Academy of Sciences has developed hydrothermal dehydration coupled carbonization to prepare sludge biochar technology, aiming at the current high metal content in sludge and high environmental risk. Difficulties, systematically investigated the migration and transformation of heavy metals in the process of sludge hydrothermal dehydration coupling carbonization to prepare sludge biochar, clarified the migration and transformation rules of heavy metals and evaluated their environmental risks. Studies have shown that, compared with the separate hydrothermal treatment of sludge and carbonization technology, hydrothermal coupling carbonization technology can more effectively improve the quality of sludge biochar and achieve the solidification of heavy metals in sludge, significantly reducing the environmental risk of sludge biochar , To provide a scientific basis for the sludge resource and harmless disposal.
The research results were published in Chemosphere, 216 (2019): 698-706 under the title of Influence of pyrolysis temperature on characteristics and environmental risk of heavy metals in pyrolyzed biochar made from hydrothermally treated sewage sludge. This research was supported by the National Academy of Sciences Youth Frontier Key Project (IUEZD201402), Fujian Provincial Industry Guiding Key Project (2015H0044), the Sino-Japanese International Science and Technology Innovation Cooperation Key Project (2016YFE0118000), Tianjin Key R & D Program Project (16YFXTSF00420) .
Technological route for preparing biochar by coupling sludge hydrothermal dehydration and carbonization
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