Treatment technique of tetrabromobisphenol A production wastewater

Abstract

The invention discloses a treatment technique of tetrabromobisphenol A production wastewater, belonging to organic chemical industry wastewater recycling and harmless environmental-protection treatment technologies. The treatment technique of tetrabromobisphenol A production wastewater is an acidification precipitation-resin adsorption-advanced oxidation combined technique, and mainly comprises the following steps: 1. regulating the pH value of the wastewater to recycle the tribromophenol in the wastewater by acidification precipitation; 2. filling the wastewater, in which abundant tribromophenol is removed, into an adsorption column by using a macroporous adsorbent resin subjected to conventional pretreatment, and passing the wastewater through a bed bottom at a certain flow rate so that chlorobenzene is adsorbed by the resin, wherein the resin adsorption is utilized to remove most chlorobenzene, bisphenol A and other nondegradable organic substances in the recycled wastewater, thereby effectively reducing COD (chemical oxygen demand) of the wastewater and relieving the treatment load of the wastewater; and 3. carrying out electrocatalytic oxidation on the wastewater subjected to acidification precipitation-resin adsorption to finally remove harmful and nondegradable substances in the wastewater, thereby achieving the goal of harmless discharge after reaching the standard.

Description

technical field [0001] The invention relates to a process method for treating waste water produced by tetrabromobisphenol A, which belongs to the resource recycling and harmless environmental protection treatment technology of organic chemical waste water. Background technique [0002] Tetrabromobisphenol A production wastewater is a typical organic chemical wastewater, which contains chlorobenzene, sodium sulfate, sodium bromide, a small amount of bromide ions, tribromophenol and other by-products, and a small amount of materials. According to the requirements of the environmental protection department, the drainage of the factory area must meet the first-level standard of other pollutant discharge units in the "Integrated Wastewater Discharge Standard" (GB8978-1996). Its main control indicators are pH value (6-9), COD value ≤ 100mg / L, chlorobenzene content ≤ 0.2mg / L and suspended solids concentration (SS) ≤ 70mg / L. [0003] The wastewater is characterized by high salt con...

AI Technical Summary

Problems solved by technology

At present, domestic chlorinated benzene wastewater treatment mainly adopts stripping (or steam stripping). Since the temperature rise is conducive to the volatilization of chlorinated benzene, most of the chlorobenzene can be removed, but it is more difficult to treat the chlorobenzene aqueous solution in the emulsified state; The rectification method cuts the components according to the different boiling points of the components, but due to the volatility of chlorobenzene, the gas-liquid equilibrium is difficult and the boiling point difference between the components is not large, resulting in the content of chlorobenzene in the distillate exceeding At the same time, its common disadvantage with stripping (or stripping) is serious energy consumption, while chemical raw materials such as chlorobenzene are decomposed and consumed, microbial electrolysis technology is immature, and power consumption is high. Insufficient and not ideal

Adsorption is a better way to remove organic matter in water, but in the process of adsorption, because activated carbon is not easy to regenerate, the adsorption capacity of activated carbon such as p-chlorobenzene is small, and activated carbon is easy to pulverize, resulting in increased flow resistance and polluting subsequent processes, it is necessary to find other types. Adsorbent material

[0004] In addition, the biochemical treatment after pretreatment will cause the death of activated sludge due to the high salinity of wastewater and the toxicity of organic matter, and will lose its treatment capacity. It must be screened and domesticated before it can be used, so its subsequent process maintenance is difficult.