Method for treating waste gas of refined terephthalic acid sewage plant

Abstract

The invention belongs to the technical field of waste gas treatment, and particularly relates to a treatment method for waste gas generated in a PTA sewage plant. Waste gas generated by a PTA sewage treatment plant is treated by adopting a combined process of alkali washing, biological filter processing, ultraviolet photolysis, water washing and activated carbon processing, and meanwhile, a dehumidification and demisting pretreatment facility is additionally arranged before an ultraviolet photolysis process, and thus the ultraviolet photolysis system can perform oxidation reaction under optimal temperature and humidity conditions. Compared with the prior art, the method has the beneficial effects that various indexes of PTA sewage plant waste gas, which is difficult to process, reach the latest emission standard requirements (national standard GB 31571-2015 and Shanghai standard DB31 / 1025-2016) through a complete set of combined treatment process.

Description

technical field [0001] The invention relates to a treatment method for waste gas from a purified terephthalic acid sewage field, and belongs to the technical field of waste gas treatment. Background technique [0002] The main components of the waste gas produced by the purified terephthalic acid (PTA) wastewater treatment plant are hydrogen sulfide, ammonia, methane, methyl mercaptan, methyl sulfide, dimethyl disulfide, benzene, toluene, xylene, vinyl acetate, etc. Generally, the concentration of non-methane total hydrocarbons is less than 300mg / m3, hydrogen sulfide is less than 30mg / m3, ammonia is less than 8mg / m3, benzene series is less than 30mg / m3, and odor concentration is less than 5000mg / m3. things. [0003] Commonly used PTA waste gas treatment technologies include: combustion method, chemical oxidation method, condensation method, adsorption, absorption method, biological trickling filtration method, plasma method, etc. [0004] The combustion method uses combust...

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Problems solved by technology

[0004] The combustion method uses combustion to oxidize the components of exhaust gas pollutants, but there is a problem of excessive nitrogen oxides, and the investment and operation costs are also high

The chemical oxidation method, condensation method and adsorption method have selectivity and cannot fully meet the standards. At the same time, the operating cost is also high. The biological trickling filtration method uses the microorganisms attached to the filler to metabolize and degrade the waste gas. The treatment effect is general and cannot be directly achieved. Emission up to standard; the plasma method uses active groups generated by high-voltage discharge to oxidize pollutants, but there are hidden dangers in operation safety

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