Biochemical pretreatment method of coal chemical industry wastewater

A technology for coal chemical wastewater and biochemical treatment, applied in the direction of oxidized water/sewage treatment, chemical instruments and methods, water/sewage multi-stage treatment, etc., can solve the problem that the ratio of biochemical oxygen demand to chemical oxygen demand in coal chemical wastewater is small , Poor biodegradability and other issues

Inactive Publication Date: 2014-03-12
CHINA COAL RES INST
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Problems solved by technology

[0009] The purpose of the present invention is to provide a biochemical pretreatment method for coal chemical wastewater, which solves the problems of small ratio of biochemical oxygen demand to chemical oxygen demand and poor biochemical properties of coal chemical wastewater

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Embodiment Construction

[0017] The present invention solves the problem that the ratio of biochemical oxygen demand to chemical oxygen demand of coal chemical industry wastewater is small and the biodegradability is poor. Under the irradiation and catalysis of ultraviolet rays, hydrogen peroxide generates hydroxyl groups with high reactivity under the action of divalent iron salt. Free radicals (·OH), and the enhanced performance of hydroxyl radicals (·OH) are very effective in degrading macromolecular refractory organics in coal chemical wastewater. Therefore, the ratio of biochemical oxygen demand to chemical oxygen demand of coal chemical industry wastewater is improved, and the biodegradability of wastewater is improved.

[0018] The technical solution adopted by the present invention to realize the object of the invention is that the method may further comprise the steps:

[0019] Step 1. Inject the coal chemical wastewater into the reaction pool, and use a radiation intensity of 0.01W / m 2 Add ...

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Abstract

The invention provides a biochemical pretreatment method of coal chemical industry wastewater, which solves the problems of small biochemical oxygen demand/chemical oxygen demand ratio and poor biodegradability in the coal chemical industry wastewater. The method comprises the following steps: injecting coal chemical industry wastewater into a reaction tank, irradiating the reaction tank under ultraviolet light with the radiation intensity of higher than 0.01W/m<2>, and adding an acidic solution to regulate the pH value of the mixed solution to 3-3.5; adding a ferrous salt solution and an oxydol solution into the reaction tank to react, discharging all the solution into a filter tank, and adding an alkaline solution into the filter tank to regulate the pH value of the mixed solution in the filter tank to 9-10 and generate a ferric precipitate; and filtering out the precipitate in the filter tank to obtain the solution capable of biochemical treatment. The method enhances the biochemical oxygen demand/chemical oxygen demand ratio of the coal chemical industry wastewater, and achieves the goal of enhancing the biodegradability of the coal chemical industry wastewater, so that the quality of the water subjected to biochemical treatment can easily satisfy the discharge standard.

Description

technical field [0001] The invention relates to a pretreatment process before the biochemical treatment stage of coal chemical industry wastewater treatment. technical background [0002] Coal chemical industry consumes a lot of water resources and discharges a lot of waste water. Coal chemical industry wastewater contains high concentrations of ammonia nitrogen, phenols, cyanides, quinoline, pyridine, indole, furan, imidazole, naphthalene, amines and chlorides and other refractory substances. The treatment of coal chemical wastewater is still a difficult problem so far. More than 80% of coal chemical wastewater in my country is difficult to meet the discharge standards, mainly because the COD, phenol content and other indicators exceed the standard. [0003] Due to the low cost of the biochemical method and the large amount of treated water, currently the wastewater after dephenolization treatment basically adopts the biochemical wastewater treatment process. However, phe...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/08C02F1/66C02F1/72C02F1/52
Inventor 吴立新任世华杜松高明龙罗腾樊金璐赵路正
Owner CHINA COAL RES INST
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