Open Access

ARTICLE

Recycling of Mud Derived from Backwash Wastewater Coagulation as Magnetic Sodalite Sphere for Zn²⁺Adsorption

by Suiyi Zhu¹, Manhong Ji¹, Hongbin Yu^1,*, Zhan Qu¹, Jiakuan Yang², Mingxin Huo¹, Yi Wang¹

1 School of Environment, Northeast Normal University, Changchun, 130024, China
2 School of Environmental Science & Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China

* Corresponding Author: Hongbin Yu. Email:

(This article belongs to the Special Issue: Current Advances in Green Nanomaterials Applications)

Journal of Renewable Materials 2021, 9(9), 1599-1607. https://doi.org/10.32604/jrm.2021.015189

Received 29 November 2020; Accepted 29 January 2021; Issue published 23 April 2021

Abstract

Herein, we reported a method to prepare magnetic sodalite sphere by using the mud from backwash wastewater after polyaluminum chloride (PAC) coagulation. The results showed that approximately 100% of Fe in the wastewater was precipitated as flocculent iron mud (FM) by adding PAC. FM was converted to spherical magnetic sodalite (FMP) with a diameter of 3 μm via a facile alkali hydrothermal method without adding Al/Si resources or reductant. The product FMP had the saturated magnetization of 10.9 emu g⁻¹ and high Zn²⁺ adsorption capacity of 50.6 mg g⁻¹. Without coagulation with PAC, the removal rate of Fe from the wastewater was only 92.7%, and the precipitated mud (RM) was converted to irregular particles (RMP), which had weak magnetic response and low capacity of Zn²⁺ adsorption comparing with FMP. With the method, the Fe in backwash wastewater was effectively recycled, and the generated sludge was converted to well-formed sodalite sphere without generating any secondary waste.

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