Journal
JOURNAL OF CLEANER PRODUCTION
Volume 271, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jclepro.2020.122512
Keywords
Waste activated sludge; Chemical leaching; Heavy metals; Dewaterability; Land application
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Funding
- Natural Science Foundation of China [51978290]
- Key Research and Development Program of Guangdong Province [2019B110209002]
- Australian Research Council (ARC) [DP170102812]
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In order to enhance heavy metals removal, two enhanced chemical leaching techniques were examined comparatively using NaClO and NaNO2 with the addition of FeCl3. The phosphorus release, dewaterability and pathogen removal of treated sludge were also examined after chemical leaching. The results showed that the heavy metals solubilization, improvement of dewaterability and pathogen removal were simultaneously achieved. Compared with NaClO treatment system, the better solubilization rates of Zn and Ni were observed in the NaNO2 treatment system. The improvement of Cu, Zn and Ni removal can be attributed to the disruption of the organically bound metal fraction based on metal distribution and EEM analysis. The TP loss caused by chemical leaching in this study was in the range of 47 %-54%. The treated sludge of the two systems could both meet Class A biosolids standards (US EPA) for land application. These results provided an alternative chemical leaching method for simultaneous improvement of sludge properties. (C) 2020 Published by Elsevier Ltd.
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