Materials Reports 2022, Vol. 36 Issue (Z1): 22050093-5 |
INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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Research Progress on Non-Orthophosphate Treatment Technology in Sewage |
LIU Li1, ZHU Liwei1, PENG Xilin1, ZHOU Yang1, ZHANG Kaibin1, SUN Haodi1, LI Xiaolin2
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1 Chongqing Three Gorges Yufu Drainage Co., Ltd., Chongqing 401133, China 2 College of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, China |
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Abstract Phosphorus is one of the essential elements of animals and plants, and it is also an important chemical raw material. With the large-scale production and application of phosphorus, the sewage produced during the period contains a large amount of phosphorus, the enrichment of phosphorus element will cause the entrophication of the water, resulting in the death of a large number of animals. At present, the phosphorus elements in sewage mainly include orthophosphate, non-orthophosphate (phosphite, hypophosphite) and organic phosphorus. With the development of the surface treatment industry, non-orthophosphates are used more and more widely as an important component of phosphating surface treatment. Compared with orthophosphate, non-orthophosphate cannot be directly removed by biological methods and coagulation methods, resulting in excessive total phosphorus. Therefore, the removal of non-orthophosphate is an important research content in wastewater treatment. This article summarizes the removal methods of non-orthophosphates, and finds the applicable methods for different systems. The treatment methods of non-orthophosphate are mainly divided into physical adsorption method and chemical oxidation method. The physical adsorption me-thod has better absorbed effect on low non-orthophosphate wastewater and high treatment efficiency, but has a greater limitation on the absorption of high non-orthophosphate wastewater; the chemical oxidation method is a commonly used method for the treatment of non-orthophosphate, and the chemical oxidation method is divided into traditional oxidation, Fenton oxidation and electrochemical oxidation. However, due to the need for additional chemicals, the chemical oxidation method produces a higher sludge content and requires higher treatment costs. In general, physical methods and chemical methods have their own advantages and disadvantages, and more in-depth research is needed on the treatment of non-orthophosphates.
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Published: 05 June 2022
Online: 2022-06-08
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