A membrane-like fenton process for wastewater treatment

Abstract

The present invention relates to a kind of membrane method class Fenton technology that is used for wastewater treatment, and its concrete steps are as follows: (1) the wastewater after biochemical treatment is passed continuously in the reactor that contains catalyst; 2 o 2 Pass it into the reactor at a certain speed, and perform a Fenton-like reaction under the action of the catalyst; (3) After a certain period of reaction, the papermaking wastewater containing the catalyst enters the membrane separation system for solid-liquid separation; (4) Separation The post-membrane permeate is purified up to standard water, and the retentate returns to the reactor to continue the reaction. On the one hand, the invention controls the H 2 o 2 Feed concentration distribution, to avoid excessive local concentration, improve the H 2 o 2 Utilization rate; on the other hand, it solves the problem of separation and recycling of nano-catalysts. It has the advantages of simple operation, mild conditions, no solid waste, high COD degradation efficiency, and the treated water can meet discharge standards or reclaimed water reuse standards. Satisfying the reuse of waste water resources, it has great development potential and application prospects in industrial waste water treatment.

Description

technical field [0001] The invention relates to a membrane-like Fenton process for wastewater treatment, which has the advantages of high COD degradation efficiency, H 2 o 2 The advantages of high utilization rate and no solid waste. Background technique [0002] The harm of industrial wastewater to the environment is increasing day by day. With the further improvement of environmental protection standards, the COD of wastewater after biochemical treatment is often higher than the national discharge standard, and further advanced treatment is required to meet the discharge standard or for industrial recycling. At present, the main advanced treatment methods include Fenton method, photocatalysis method, activated carbon adsorption, ozone oxidation method, electrochemical method, wet oxidation method, etc. These methods have more or less problems, such as the Fenton method produces a large amount of solid waste and increases The salt content in water; the catalytic efficienc...

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Problems solved by technology

At present, the main advanced treatment methods include Fenton method, photocatalysis method, activated carbon adsorption, ozone oxidation method, electrochemical method, wet oxidation method, etc. These methods have more or less problems, such as the Fenton method produces a large amount of solid waste and increases The salt content in water; the catalytic efficiency of photocatalytic method is not high; the electrode preparation of electrochemical method is cumbersome, and the power consumption is high; the ozone oxidation method has high degradation efficiency, high energy consumption, low ozone solubility and low utilization rate; wet oxidation method treatment High efficiency, but the temperature and pressure required for the reaction are large

In recent years, a Fenton-like process (also known as heterogeneous Fenton process) has been developed, which has the advantages of fast oxidation rate, high catalyst activity, good stability, and no large amount of precipitation during the reaction process, but there are also H 2 o 2 Problems such as low utilization rate, catalyst recycling and separation difficulties

[0003] Chinese patent CN 104923229 A discloses an activated carbon catalyst for treating refractory organic wastewater by the Fenton method and its preparation and application. The activated carbon catalyst treats wastewater at room temperature, and H 2 o 2 (mg / L): COD (mg / L) is 0.3-1.5, space velocity is 0.5-2.0h -1 , COD removal rate is greater than 50%, but H 2 o 2 The utilization rate of the catalyst needs to be improved, and there is a problem of catalyst recycling

The method disclosed in Chinese patent CN 105731624 A uses heterogeneous Fenton reaction to catalyze and oxidize reverse osmosis concentrated water. In the reaction system, the catalyst and H 2 o 2 At the same time, it reacts with the reverse osmosis concentrated water, and the organic pollutants in the reverse osmosis concentrated water are non-selectively oxidized and degraded by the generated hydroxyl radicals, so as to realize the stable discharge of the reverse osmosis concentrated water, but the reaction directly adds H 2 o 2 , will lead to excessive local concentration, making its H 2 o 2 Utilization rate is not high

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