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

A technology of persulfate and oxidation coupling, applied in the field of water treatment, can solve the problems of increasing the risk of secondary pollution, difficult to achieve complete mineralization, toxic intermediate products, etc. Significant economic advantages and cost-effective effects

Active Publication Date: 2019-10-22
SOUTH CHINA NORMAL UNIVERSITY
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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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  • Method for treating wastewater by coupling advanced oxidation of persulfate and biological sulfate reduction
  • Method for treating wastewater by coupling advanced oxidation of persulfate and biological sulfate reduction
  • Method for treating wastewater by coupling advanced oxidation of persulfate and biological sulfate reduction

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Embodiment Construction

[0059] The invention uses persulfate-based advanced oxidation technology to couple sulfate-reducing bacteria to degrade and mineralize refractory organic matter in organic wastewater, and realize regeneration and recycling of iron-based catalysts. Taking acid orange II (Orange II) in the treatment of printing and dyeing wastewater as an example, the method includes the following steps: preparing the surface containing ferrous iron (Fe II ) oxide, which contains magnetic zero-valent iron (Fe 0 ) Iron-based catalyst (Fe 0 @Fe x o y particles); using Fe 0 @Fe x o y Fe on particle surface II Activation of sodium peroxodisulfate (PDS) to produce sulfate radicals (SO 4 - ) Degrade Orange II to produce Orange II degradation products and sulfate radicals; the advanced oxidation intermediates of Orange II are mixed with domestic sewage in a certain proportion and then passed into the sulfate reduction bioreactor; the sulfate reduction bioreactor is colonized with Sulfate-reduc...

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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...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F101/30C02F101/34C02F101/36C02F101/38
CPCC02F1/72C02F3/34C02F1/725C02F3/345C02F2101/30C02F2101/34C02F2101/308C02F2101/36C02F2101/38
Inventor 江峰余小玉孙建良黄艺
Owner SOUTH CHINA NORMAL UNIVERSITY
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