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Article

Treatment of Wastewater Effluent with Heavy Metal Pollution Using a Nano Ecological Recycled Concrete

1
Environment Research Institute, Shandong University, Qingdao 266237, China
2
School of Environmental Science and Engineering, Shandong University, Qingdao 266237, China
3
School of Civil Engineering, Qingdao University of Technology, Qingdao 266520, China
4
School of Space and Environment, Beihang University, Beijing 100191, China
*
Author to whom correspondence should be addressed.
Academic Editor: Laura Bulgariu
Water 2022, 14(15), 2334; https://doi.org/10.3390/w14152334
Received: 23 June 2022 / Revised: 24 July 2022 / Accepted: 26 July 2022 / Published: 28 July 2022
(This article belongs to the Special Issue Water Environment Pollution and Control)
Water pollution exacerbates water stress and poses a great threat to the ecosystem and human health. Construction and demolition waste (CDW) due to rapid urbanization also causes heavy environmental burdens. A major proportion of CDW can be effectively converted into recycled aggregates, which can be reused in many fields, including environment remediation. In this study, a nano ecological recycled concrete (nano-ERC) was produced with recycled aggregates and copper oxide nanoparticles (nCuO) to remove heavy metals (HMs) from a simulated wastewater effluent (SWE) for further treatment. Recycled aggregates were obtained from CDW, thereby simultaneously reducing the treatment cost of the SWE and the environmental burden of solid waste. The adsorption capacity of nano-ERC was presumed to be significantly enhanced by the addition of nCuO due to the unique large surface-to-volume ratio and other properties of nanoparticles. The SWE containing five common HMs, arsenic (As), chromium (Cr), cadmium (Cd), manganese (Mn) and lead (Pb), was filtered through a control ERC and nano-ERCs, and the concentrations of these HMs were determined with ICP-MS in the SWE and the filtrates. Results showed the nano-ERCs could significantly remove these HMs from the SWE compared to the control ERC, due to the enhanced adsorption capacity by nCuO. The relative weighted average removal percentage (RWAR%) was in the range of 53.05–71.83% for nano-ERCs and 39.27–61.65% for control ERC. Except for Cr, concentrations of these HMs in the treated wastewater effluent met the requirements for crop irrigation or scenic water supplementation; the Cr may be removed by multiple filtrations. In conclusion, nano-ERC can serve as a cost-effective approach for the further treatment of wastewater effluent and may be applied more widely in wastewater treatment to help relieve water stress. View Full-Text
Keywords: adsorption; heavy metal pollution; nano ecological; recycled aggregates; water stress adsorption; heavy metal pollution; nano ecological; recycled aggregates; water stress
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MDPI and ACS Style

Liu, J.; Su, J.; Zhao, Z.; Feng, W.; Song, S. Treatment of Wastewater Effluent with Heavy Metal Pollution Using a Nano Ecological Recycled Concrete. Water 2022, 14, 2334. https://doi.org/10.3390/w14152334

AMA Style

Liu J, Su J, Zhao Z, Feng W, Song S. Treatment of Wastewater Effluent with Heavy Metal Pollution Using a Nano Ecological Recycled Concrete. Water. 2022; 14(15):2334. https://doi.org/10.3390/w14152334

Chicago/Turabian Style

Liu, Jing, Jiayi Su, Zhenyu Zhao, Weiying Feng, and Shuai Song. 2022. "Treatment of Wastewater Effluent with Heavy Metal Pollution Using a Nano Ecological Recycled Concrete" Water 14, no. 15: 2334. https://doi.org/10.3390/w14152334

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