Petrochemical wastewater advanced treatment method

Abstract

A petrochemical wastewater advanced treatment method includes the following steps: a, discharging secondary treatment effluent of petrochemical wastewater into a sewage pool, ascending the effluent into a coagulation sedimentation tank by a water inlet pump, at the same time, adding a flocculant PAC and a flocculant PAM to the coagulation reaction pool, determining the PAC adding quantity to be 10-30 mg/L and the PAM adding quantity to be 0.2-0.8 mg/L according to water quality conditions of the petrochemical wastewater, after sedimentation, allowing the effluent to enter a primary filter, filtering to remove residual suspended solids, and allowing the effluent after filtration to flow into a middle water pool; b, sending the wastewater in the middle water pool to a catalytic oxidation reactor by a lifting pump with the residence time of 0.5-1.5 h, feeding water and simultaneously adding ozone with the ozone adding quantity of 20-50 mg/L, and carrying out a catalytic oxidation reaction; and c, allowing the effluent of the catalytic oxidation reactor to self-flow through a pipeline mixer, adding the flocculant PAC in the pipeline mixer with the PAC adding quantity of 2-4 mg/L, allowing the wastewater after mixing to enter a secondary filter, carrying out micro-flocculation and filtration treatment, allowing clear water after filtration to enter a clear water pool, and meeting requirements of discharge or reuse.

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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