Method for treating wastewater generated in production of hexabromocyclododecane

Abstract

The invention discloses a method for treating wastewater generated in production of hexabromocyclododecane. The method comprises the following steps of: performing metal catalytic reduction on the wastewater by using iron powder and / or aluminum powder and adding inorganic sodium salt and / or inorganic magnesium salt which serves as a catalyst; and performing biochemical treatment. When the wastewater generated in the production of the hexabromocyclododecane, after the wastewater is subjected to the metal catalytic reduction and flocculent precipitation treatment, the biodegradability of the hexabromocyclododecane wastewater is greatly improved, the wastewater treatment effect is improved, the chemical oxygen demand (COD) in the treated wastewater is 80-120mg / L, ammonia nitrogen in the treated wastewater is less than 30mg / L, and the daily treatment capacity of a wastewater biochemical system is improved. A reducing agent has the advantages of readily available raw materials and low price, heavy metal pollution is avoided, and the wastewater treatment cost is reduced.

Description

technical field [0001] The invention relates to a technology for treating industrial wastewater, in particular to a method for treating wastewater produced by hexabromocyclododecane. Background technique [0002] Hexabromocyclododecane, referred to as HBCD or HBCDD, is an alicyclic additive flame retardant with high bromine content. The current common production process is mainly composed of 1, 5, 9-cyclododecatriene (CDDT) and bromine in several types of mixed solvents such as alcohol hydrocarbons and alkanes. During the production process, high-concentration refractory wastewater containing alcoholic hydrocarbons and halogenated alkanes and a small amount of products is produced. The existing sewage treatment process has a low treatment effect on the wastewater produced by hexabromocyclododecane, and it is difficult to discharge the sewage up to the standard. Therefore, the treatment of HBCD production wastewater has become a bottleneck in the development of the HBCD ind...

AI Technical Summary

Problems solved by technology

[0004] 1. In terms of physical treatment, either the treatment cost is high and it is difficult to promote, or the treatment effect cannot meet the emission requirements

[0005] 2. In terms of biological treatment, due to the strong biological toxicity of halogenated hydrocarbons, there is no activated sludge that has a good degradation ability for halogenated hydrocarbons. Long-term operation will lead to a decrease in the activity of activated sludge, leading to the collapse of the biochemical system

[0006] 3. In terms of chemical treatment, although the advanced oxidation process (AOPs) has achieved relatively rich results in the treatment of hexabromocyclododecane wastewater, there are still some problems such as harsh treatment process conditions, expensive oxidants or catalysts required for the treatment process , needs to use Cu, Pd, Pt, etc. as reducing agents, and it is easy to cause secondary pollution of heavy metals, etc., so it is difficult to apply industrially, and cannot completely solve the problem of HBCD wastewater treatment