Device and method for deeply treating coal gasification wastewater

Abstract

The invention provides a device and a method for deeply treating coal gasification wastewater and belongs to the technical field of wastewater treatment. The device comprises a water storage tank, a deep treatment reactor, an ozone generator, a gas cleaning tank and a clean water tank; a micro-pore titanium aerator is arranged on the bottom of the deep treatment reactor; a compound catalyst is filled in the deep treatment reactor. According to the invention, the micro-pore titanium aerator and a novel self-prepared efficient catalyst are combined for treating biochemical effluent of coal gasification wastewater, so as to realize standardized discharge of coal gasification wastewater. The catalyst prepared according to the invention has an efficient catalytic performance and is easy for recycling; the treatment process of coal gasification wastewater is simple; the reaction energy consumption is less; the treating device occupies less area.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to an advanced treatment device and method for coal gasification wastewater. Background technique [0002] The coal gasification process is under high temperature conditions, with coal as raw material and oxygen-carrying gasification agent as the gasification medium, through a series of physical and chemical reactions in the gasifier to convert coal from polymer solid matter to The process of small molecule gases. The composition of coal gasification wastewater is extremely complex, mainly including phenolic compounds, long-chain alkanes, aromatic hydrocarbons, polycyclic aromatic hydrocarbons, nitrogen-containing heterocyclic compounds, ammonia nitrogen, cyanide and thiocyanate, which are typical high-concentration refractory substances Industrial wastewater has poor biodegradability. Although conventional biological treatment has a certain ability to treat it, the efflue...

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Problems solved by technology

The composition of coal gasification wastewater is extremely complex, mainly including phenolic compounds, long-chain alkanes, aromatic hydrocarbons, polycyclic aromatic hydrocarbons, nitrogen-containing heterocyclic compounds, ammonia nitrogen, cyanide and thiocyanate, which are typical high-concentration refractory substances Industrial wastewater has poor biodegradability. Although conventional biological treatment has a certain ability to treat it, the effluent from biochemical treatment still cannot meet the discharge or reuse standards. There are still some refractory pollutants in the water, and direct discharge will cause The occurrence of serious environmental pollution incidents requires advanced treatment of coal chemical wastewater biochemical effluent

[0003] Ozone has strong oxidizing properties and can completely mineralize organic matter in wastewater into CO 2 and H 2 O, the reaction speed is fast, no sludge is generated, no secondary pollution, and can play the role of decolorization, deodorization, sterilization, etc., but the ozone oxidation reaction has a certain selectivity. If the ozone oxidation is used alone to treat wastewater, the investment cost is high. Its mass transfer efficiency, reaction efficiency and utilization efficiency are relatively low, and it cannot effectively remove refractory organic substances such as polycyclic aromatic hydrocarbons and nitrogen-containing heterocyclic compounds.

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