Composite Polysilicate Metal Coagulants for Simultaneous Removal of Organic Matter, Phosphorus, and Ammonium-Nitrogen: Effects of Metal/Silicate Molar Ratio and Basicity

Author:

Guo Hanxu1,Li Peng2,Du Lianfeng2,Zou Guoyuan2,Guo Xuan2ORCID

Affiliation:

1. School of Mechanical Engineering, Tiangong University, Tianjin 300387, China

2. Institute of Plant Nutrition, Resources and Environment, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China

Abstract

Coagulation can effectively recover substances from wastewater; however, there is a lack of efficient coagulants for simultaneous recovery of organic matter, nitrogen, and phosphorus. We prepared a composite polysilicate metal (CSM) flocculant by combining Fe3+ and Mg2+ ions in polysilicic acid (PSiA). According to the results of scanning electron microscopy (SEM), X-ray diffraction (XRD), and Fourier-transform infrared spectroscopy (FTIR), the CSM exhibited a larger amorphous phase along with new compounds, including Mg3Fe2(SiO4)3 and hydroxyl metals. The CSM demonstrated a higher coagulation efficiency than PSiA and polymeric ferric sulfate, particularly for PO43−-P and NH4+-N removal. The metal/silicate molar ratio substantially influenced the structure and composition of the CSM, along with the coagulation efficiency, with an optimal ratio of 3:1. Additionally, we proposed a novel preparation strategy to achieve an optimum CSM basicity (B*) for coagulation by adjusting the initial pH of PSiA (pHInitial) without adding an alkali agent. The results demonstrated that the optimum B* can be obtained by adjusting pHInitial to 0.5 or 1. The overall optimum coagulation performance for the simultaneous removal of organic matter, PO43−P, and NH4+-N from wastewater was 68.5%, 99%, and 17.5%, respectively. This study provides a feasible approach for synchronous pollutant recovery from wastewater.

Funder

Key R&D Plan of China

Beijing Academy of Agriculture and Forestry Sciences

Young Talent Support Project from CAST

Publisher

MDPI AG

Subject

Water Science and Technology,Aquatic Science,Geography, Planning and Development,Biochemistry

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