Highly Efficient Removal of Nitrate and Phosphate to Control Eutrophication by the Dielectrophoresis-Assisted Adsorption Method

Jiaxi Li, Qinghao Jin, Yuran Liang, Junfeng Geng, Jianxin Xia, Huiying Chen and Miaoying Yun
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Jiaxi Li: College of Life and Environmental Science, Minzu University of China, Beijing 100081, China
Qinghao Jin: College of Life and Environmental Science, Minzu University of China, Beijing 100081, China
Yuran Liang: College of Life and Environmental Science, Minzu University of China, Beijing 100081, China
Junfeng Geng: Institute for Materials Research and Innovation, Institute for Renewable Energy and Environmental Technologies, University of Bolton, Bolton BL3 5AB, UK
Jianxin Xia: College of Life and Environmental Science, Minzu University of China, Beijing 100081, China
Huiying Chen: College of Life and Environmental Science, Minzu University of China, Beijing 100081, China
Miaoying Yun: College of Life and Environmental Science, Minzu University of China, Beijing 100081, China

IJERPH, 2022, vol. 19, issue 3, 1-11

Abstract: The removal of excessive amounts of nitrate and phosphate from water sources, especially agricultural wastewater, has been of high significance to control eutrophication in aquatic systems. Here, a new method is reported for the removal of nitrate and phosphate simultaneously from wastewater based on the combination of the solution-phased adsorption (ADS) and dielectrophoresis (DEP) techniques. The plant ash was first selected as the adsorbent by screening tests, followed by a systematic investigation of using the adsorbent to remove nitrate and phosphate from wastewater under various experimental conditions, including the testing of adsorbent dosage, pretreatment time, water flow rate, and electrode voltage. The analysis of the adsorbent particles was also performed by scanning electron microscope (SEM) analysis, the energy dispersive X-ray spectroscopy (EDX) test, and the measurement of Zeta potentials. Compared with the ADS method alone, the introduction of DEP into the purification process has greatly increased the removal rate by 66.06% for nitrate and 43.04% for phosphate, respectively. In the meantime, it is observed that the processing time has been greatly reduced by 92% with the assistance of DEP.

Keywords: dielectrophoresis; adsorption; nitrate; phosphate; plant ash; eutrophication control (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2022
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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