A method for advanced treatment of petrochemical wastewater

Abstract

A method for the advanced treatment of petrochemical wastewater, comprising the following steps: a. Discharging the secondary treatment effluent of petrochemical wastewater into a sewage tank, lifting it into a coagulation sedimentation tank by an inlet pump, and simultaneously throwing flocculants PAC and PAM into a coagulation reaction tank According to the water quality conditions of petrochemical wastewater, the dosage of PAC is determined to be 10-30mg / L, and the dosage of PAM is 0.2-0.8mg / L. After precipitation, the effluent enters the primary filter to filter out the remaining suspended solids , after filtering, the effluent flows into the intermediate pool; b. The sewage in the intermediate pool is sent into the catalytic oxidation reactor through the lifting pump, and the residence time is 0.5-1.5h. At the same time, ozone is added to the water, and the ozone dosage is 20-50mg / L. Catalytic oxidation reaction; c. Catalytic oxidation reactor effluent flows through the pipeline mixer by itself, and flocculant PAC is added in the pipeline mixer. The dosage of PAC is 2-4mg / L, and the mixed sewage enters the secondary filter for further processing Micro-flocculation and filtration treatment, the filtered water enters the clean water tank to meet the discharge or reuse requirements.

Description

technical field [0001] The invention relates to advanced treatment of petrochemical wastewater, and belongs to the technical field of advanced purification of refractory biodegradable sewage. Background technique [0002] With the development of my country's industry, the discharge of industrial sewage is increasing day by day. The discharge of industrial sewage may have a serious impact on the basin environment and the health of residents. Among them, the discharge of sewage from the petrochemical industry is even more harmful to the ecological environment. Petrochemical companies process many types of crude oil, which is frequently replaced, resulting in large fluctuations in sewage water quality, complex components, high COD content, poor biochemical properties, and many refractory substances such as hydrocarbons and their derivatives, making it difficult to treat and reuse. [0003] Petrochemical sewage usually enters the biochemical pool after pretreatment, and most of ...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the deficiencies of the prior art, the present invention provides a method that overcomes the problems of low utilization rate of ozone oxidation, large dosage, slow reaction speed, substrate selectivity and high energy consumption, and can use ozone to catalyze the production of hydroxyl radicals. Strong oxidative properties can completely degrade and transform pollutants to meet the requirements of effluent, which is an advanced treatment method for petrochemical wastewater

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