Comparative Study on the Migration of Heavy Metals in the Sewage Sludge Treated by Supercritical/Subcritical Water Oxidation Process
- 10.2991/icaees-15.2015.25How to use a DOI?
- supercritical water oxidation, subcritical water oxidation, secondary sludge, migration law of heavy metals.
Super/sub-critical water oxidation technology has been utilized to treat sewage sludge in the study. Heavy metal content and characteristics of leaching toxicity in the reaction effluent have been investigated in detail, and then the relationship between the microstructure of sludge residue and immobilization of heavy metals is analyzed systematically. The obtained results show that the enrichment ratios of heavy metals in the sludge residue are above 68%, except As; Super/sub-critical water oxidation process has good immobilization effects on the heavy metals in sewage sludge residue, except Cd and Cu; Compared with subcritical state, supercritical water oxidation process has more obvious immobilization effects on the heavy metals in sewage sludge residue. The heavy metals in sewage sludge residue exist in the form of complex compounds, presenting obviou s crystalline state, with part of crystal structures being similar. The formation of crystal microstructures contribute to the enrichment and immobilization of heavy metals in sewage sludge.
- © 2015, the Authors. Published by Atlantis Press.
- Open Access
- This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).
Cite this article
TY - CONF AU - Rui Ma AU - Yang Zhou AU - Lin Fang PY - 2015/07 DA - 2015/07 TI - Comparative Study on the Migration of Heavy Metals in the Sewage Sludge Treated by Supercritical/Subcritical Water Oxidation Process BT - Proceedings of the 3rd International Conference on Advances in Energy and Environmental Science 2015 PB - Atlantis Press SP - 139 EP - 145 SN - 2352-5401 UR - https://doi.org/10.2991/icaees-15.2015.25 DO - 10.2991/icaees-15.2015.25 ID - Ma2015/07 ER -