Release characteristics and water washing of heavy metals from electroplating sludge during low-temperature drying

Liu, Huaiyu, Hong, Xiaoting, Wu, Keming and Hui, Kwan San ORCID: https://orcid.org/0000-0001-7089-7587 (2021) Release characteristics and water washing of heavy metals from electroplating sludge during low-temperature drying. Desalination and Water Treatment, 236. pp. 76-87. ISSN 1944-3994

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Abstract

This work demonstrates the electroplating sludge (ES) drying and the control method of heavy metal exhaust during the low-temperature drying process. The drying efficiency of ES has a maximum value at an air volume of 1.1 m3 h–1 and a drying temperature of 70°C. The release amounts of heavy metals of the process were measured with inductively coupled plasma. Specifically, the release amounts were 0.009, 0.124, 0.170 and 2.097 µg g–1 for Cu, Ni, Mn and Zn without the employ-ment of control methods, respectively, which exceed China’s National Standard. Nevertheless, the release amount of heavy metals can meet the National Standard after the exhaust gas was washed by absorption solution with pH above 5. Further, the maximum absorption rates of Cu, Ni, Mn and Zn were 63.97%, 98.79%, 98.16% and 99.24%, respectively at a pH of 13. The absorption rates of Cu, Ni, Mn and Zn were 63.67%, 90.68%, 97.87% and 91.37%, respectively when water was used as the absorption solution with a pH of 7, which was a low-cost method. Dried ES sample was analyzed by X-ray diffraction, X-ray photoelectron spectroscopy and scanning electron microscopy–ener-gy-dispersive X-ray analysis. The released amount of heavy metals increased with the increase of the content of heavy metals in ES. Electroplating enterprises will save 46.3% disposal cost by drying electroplating sludge at low-temperature.

Item Type:	Article
Additional Information:	Funding Information: Financial supports for this work were provided by the Natural Science Foundation of Zhejiang Province (LY18E080016), the Open Foundation of State Environmental Protection Key Laboratory of Mineral Metallurgical Resources Utilization and Pollution Control (HB201909), and the Fundamental Research Funds of Zhejiang Sci-Tech University (2020Q048). Publisher Copyright: © 2021 Desalination Publications.
Uncontrolled Keywords:	electroplating sludge,hazardous waste,low-temperature drying,water washing of heavy metals,water science and technology,ocean engineering,pollution,sdg 12 - responsible consumption and production ,/dk/atira/pure/subjectarea/asjc/2300/2312
Faculty \ School:	Faculty of Science > School of Engineering
Related URLs:	http://www.scopus.com/inward/record.url?...
Depositing User:	LivePure Connector
Date Deposited:	25 Apr 2024 10:32
Last Modified:	25 Apr 2024 10:32
URI:	https://ueaeprints.uea.ac.uk/id/eprint/95015
DOI:	10.5004/dwt.2021.27672

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