Pretreatment technology for high-concentration refractory organic petrochemical wastewater

Abstract

The invention discloses a pretreatment technology for high-concentration refractory organic petrochemical wastewater. The technology comprises steps as follows: (1) the organic petrochemical wastewater is acidized until the pH ranges from 4 to 5, then the organic petrochemical wastewater is heated to the temperature of 80-95 DEG C, and wastewater A is obtained through solid-liquid separation after precipitation of silicate; (2) iron and copper plates are added to the wastewater A for microelectrolysis for 0.5-2 h, then wastewater B is obtained through solid-liquid separation, the pH of the wastewater B is adjusted to range from 2.0 to 2.5, a hydrogen peroxide solution accounting for 0.5%-3% of the wastewater B in volume is added, the mass fraction of the hydrogen peroxide solution is 25%-40%, a reaction is performed for 1-3 h, and wastewater C is obtained; (3) after the pH of the wastewater C is adjusted to range from 2.5 to 3.5, the wastewater C is subjected to three-dimensional electro-Fenton treatment for 1-3 h, then a flocculating agent is added after the pH is adjusted to range from 9.5 to 10.5 by alkaline liquor, and wastewater D is obtained after solid-liquid separation; (4) the pH of the wastewater D is adjusted to range from 1.5 to 3.5, a catalyst and persulfate are added, the mixture is irradiated by ultraviolet light and aerated for photocatalytic oxidation for 1-2 h, and the pretreatment of the wastewater is completed. With the adoption of the technology, the COD (chemical oxygen demand) value of the wastewater is effectively decreased, and the biodegradability of the wastewater is improved.

Description

technical field [0001] The invention relates to a high-concentration refractory organic petrochemical wastewater pretreatment process. Background technique [0002] The pollution of high-concentration refractory organic wastewater has become the crux of the domestic water pollution problem, and it is also a research difficulty and hot spot in the field of environment. In order to ensure the water environment needed for human survival, it is imperative to develop economical and effective new technologies for refractory water treatment. [0003] For various types of high-concentration refractory industrial wastewater, research at home and abroad mainly focuses on the treatment of printing and dyeing wastewater, petroleum wastewater, coking wastewater, pharmaceutical wastewater and chemical wastewater. The common characteristics of this type of wastewater are high concentration of pollutants, poor biochemical properties, high toxicity, and obvious carcinogenic, teratogenic, an...

AI Technical Summary

Problems solved by technology

There are many domestic and foreign research reports on single or combined advanced oxidation technology, but there is no systematic and in-depth research on complex and high-concentration refractory organic wastewater generated by a certain type or industry