AI Article Synopsis
- A new biochar was created by mixing bamboo sawdust and sewage sludge in a 1:1 ratio through co-pyrolysis at temperatures of 400-600°C.
- This process resulted in lower biochar yield but higher carbon content compared to using sewage sludge alone.
- Additionally, co-pyrolysis helped convert toxic metals in sewage sludge into more stable forms, reducing their toxicity and environmental risks when the biochar is applied to land.
Article Abstract
A novel type of biochar was produced by mixing bamboo sawdust with sewage sludge (1:1, w/w) via a co-pyrolysis process at 400-600°C. Changes in physico-chemical properties and the intrinsic speciation of metals were investigated before and after pyrolysis. Co-pyrolysis resulted in a lower biochar yield but a higher C content in the end product compared with use of sludge alone as the raw material. FT-IR analysis indicates that phosphine derivatives containing PH bonds were formed in the co-pyrolyzed biochars. In addition, co-pyrolysis of sludge with bamboo sawdust transformed the potentially toxic metals in the sludge into more stable fractions, leading to a considerable decrease in their direct toxicity and bioavailability in the co-pyrolyzed biochar. In conclusion, the co-pyrolysis technology provides a feasible method for the safe disposal of metal-contaminated sewage sludge in an attempt to minimize the environmental risk from potentially toxic metals after land application.
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| http://dx.doi.org/10.1016/j.biortech.2016.12.103 | DOI Listing |
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