Treatment system for organic matters in petrochemical sewage reverse osmosis concentrated water and treatment method thereof

Abstract

The invention provides a treatment system for organic matters in petrochemical sewage reverse osmosis concentrated water and a treatment method thereof. The system comprises a softening tank, a flocculating tank, a settling pond, a pH regulation tank and a multi-element catalytic oxidation device which are sequentially communicated, wherein the settling pond is communicated with the softening tank through a sludge return pump, and a softening tank stirrer and a flocculating tank stirrer are respectively arranged in the softening tank and the flocculating tank. The method comprises the following steps: sequentially softening, flocculating and settling the petrochemical sewage reverse osmosis concentrated water; inputting the water into the pH regulation tank, and regulating the pH value to 4-5; inputting the water into the multi-element catalytic oxidation device through a multi-element catalytic oxidation water inlet pump, and performing multi-element catalytic oxidation treatment; and discharging the water after reaching the standard. The actual treatment effect proves that when the petrochemical sewage reverse osmosis concentrated water is treated by the multi-element catalytic oxidation device, the COD (chemical oxygen demand) in the reverse osmosis concentrated water can be reduced from 76-116mg / L to 31-42 mg / L, and the requirements of Emission Standard of Pollutants for Petroleum Chemistry Industry (GB 31571-2015) are met.

Description

technical field [0001] The invention relates to a treatment system and a treatment method for organic matter in reverse osmosis concentrated water of petrochemical sewage, belonging to the technical field of environmental engineering. Background technique [0002] As a high-efficiency desalination technology, reverse osmosis has been widely used in the advanced treatment and reuse of sewage in petrochemical enterprises; that is, the up-to-standard external drainage of petrochemical enterprises is used as raw water, and high-quality desalted water is obtained after reverse osmosis treatment for circulating cooling water Used for water replenishment or boiler steam production. Generally, the recovery rate of reverse osmosis system to reuse sewage to produce desalinated water is about 70% to 75%. This process will also produce 25% to 30% concentrated water, and the inorganic salts and COD and other pollutants in the concentrated water are eliminated. Concentrated nearly 4 time...

AI Technical Summary

Problems solved by technology

[0005] (2) The biodegradability is poor, and most of the COD in the concentrated water is residual refractory organic pollutants;

The advanced oxidation technology based on ozone oxidation has the advantages of strong oxidation, high COD removal rate, and short process; however, in actual engineering applications, there are long reaction times required for ozone oxidation, large ozone consumption, construction costs and Disadvantages such as high processing costs, and due to the high-salt environment, the catalyst packing bed is prone to scaling and hardening during long-term operation, which reduces the reaction efficiency

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