Method for simultaneous removal of sulfur dioxide and nitrogen oxides in flue gas by double-tower series catalytic-biofilm packed tower system

Abstract

The invention provides a twin tower tandem exhaust gas purifying processing combination device which adopts a biomembrane packing tower system utilizing catalytic oxidant cyclically spraying liquid in the front and a biomembrane packing tower system utilizing pH buffering agent cyclically spraying liquid in the rear, which can carry out purifying processing to simultaneously remove the SQ2 and the NOx in the exhaust gas and to obtain by-products, namely, the utilizable sulphuric acid and nitrating acid products. The invention is characterized in that desulphuricants and denitrifier complex bacteria with the performance of simultaneously removing SQ2 and NOx in the exhaust gas under the conditions of liquid-phase catalyzed oxidation and pH acid environment can be obtained by screening and culturing and domesticating, and the composite bacteria biofilm to manufacture the biomembrane packing tower which is arranged in the tandem front end and is mainly used for removing SQ2; and the biomembrane packing tower which is mainly used for removing NOx in the rear is manufactured by adopting the denitrifier complex bacteria biofilm with the performance of removing NOx in the exhaust gas under the condition of pH neutral environment through screening and culturing and domesticating.

Description

technical field [0001] The invention relates to a dual-tower series catalytic-biofilm packed tower system for simultaneous removal of sulfur dioxide (SO 2 ) and nitrogen oxides (NOx) purification treatment and by-product can use sulfuric acid nitric acid products. The invention belongs to the technical field of exhaust gas purification by biological-chemical combined method. Background technique [0002] In recent years, with the rapid development of economy and the sharp increase of coal consumption, my country's SO 2 Emissions have reached more than 20 million tons, from SO 2 The acid rain pollution damage area mainly caused by acid rain has accounted for about 40% of the country's land area, and the economic loss caused by it has reached hundreds of billions of yuan every year in the country. SO 2 As a major problem of environmental pollution, the harm of environmental pollution has already attracted great attention from governments and environmental protection depart...

AI Technical Summary

Problems solved by technology

However, since this technical method adopts a biofilm packed tower system using a catalytic oxidation circulating spray liquid, that is, a single-tower purification system, its by-product is a mixed solution of sulfuric acid and nitric acid, and since the system is operated under acidic pH conditions, NOx The purification efficiency is not high enough

Although this by-product sulfuric acid and nitric acid mixture can be used to process and make fertilizers by adding ammonia and other substances, if the sulfuric acid and nitric acid in it are not separated, its comprehensive utilization will be greatly restricted

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