Method for treating wastewater by coupling advanced oxidation of persulfate and biological sulfate reduction

Abstract

The invention discloses a method for treating wastewater by coupling advanced oxidation of persulfate and biological sulfate reduction. The method comprises: 1) mixing organic wastewater, an iron-based catalyst and a persulfate in a reactor 1, and carrying out an advanced oxidation reaction; 2) adding the effluent of the step 1), and the used iron-based catalyst to a reactor 2 containing sulfate reducing bacteria, mixing with an organic carbon source, and carrying out a sulfate reduction reaction; and 3) carrying out a reducing reaction on the sulfide generated by the sulfate reduction reaction in the reactor 2, and the iron-based catalyst used in the step 1) to obtain a regenerated iron-based catalyst, carrying out magnetic separation on the regenerated iron-based catalyst, and returningto the reactor 1 so as to be recycled. According to the present invention, the catalytic-biochemical coupling treatment of the difficultly-degraded organic wastewater and the regeneration and recycling of the catalyst are achieved so as to increase the recycling efficiency of the catalyst, reduce the cost, reduce the biological toxicity of the advanced oxidation intermediate, improve the effluentwater quality, and reduce the environmental risk.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a method for treating wastewater by coupling advanced persulfate oxidation with biological sulfate reduction. Background technique [0002] With the rapid development of my country's social economy, the degree of industrialization is changing with each passing day, and the production of various types of refractory organic wastewater is increasing day by day. Using low-cost and high-efficiency treatment methods to treat refractory organic wastewater is a difficult and hot topic in recent years. Refractory organic wastewater refers to organic pollutants that contain low biodegradability, refractory biodegradation, and difficult to completely decompose in wastewater. These refractory organic pollutants mainly include dyes, polychlorinated biphenyls, polycyclic aromatic hydrocarbons, phenols, and aniline. Classes and nitrobenzenes, pesticides and so on. Refracto...

AI Technical Summary

Problems solved by technology

However, the former has the problem of increased energy costs, while the latter also introduces reducing agents, increasing the risk of secondary pollution

Although advanced oxidation technology overcomes many shortcomings of biological methods and physicochemical methods, it can effectively remove refractory organic matter, but it is difficult to achieve complete mineralization, and even produces more toxic intermediate products

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