Method for improving denitrification efficiency of biological membrane packed tower for simultaneously removing sulfur and nitrogen from smoke by externally adding rare earth enhancer

Abstract

The invention discloses a method for improving the denitrification efficiency of a biological membrane packed tower for simultaneously removing sulfur and nitrogen from smoke by externally adding a rare earth enhancer. The method comprises the steps of adding the mixture of low-concentration rare earth elements include lanthanum (La) and cerium (Ce) into circulating liquid of a circulating liquid storage tank of a biological membrane packed tower system to be as a biological activity enhancer, uniformly mixing, spraying the biological activity enhancer to a biological membrane in the tower along with the circulating liquid to stimulate and improve the adaptability of denitriding flora in a microbial flora based on autotrophic bacteria to a low-pH strong-acidity growing environment condition, so as to accelerate the rapid growth and reproduction of the microbial flora, thus achieving the effect of improving the denitrification efficiency of the biological membrane packed tower for simultaneously removing the sulfur and nitrogen of the smoke. According to an experiment, the rare earth enhancer including 0.25mg / L lanthanum nitrate and 0.25mg / L of cerous nitrate in the additive concentration ratio is screened out. Due to the application of the technical method disclosed by the invention, the NOx removal efficiency of the biological membrane packed tower is improved by 20.6% and 13.9% respectively, and an application effect of a simultaneous smoke desulfurization and denitrification technique by virtue of a biological method is remarkably improved.

Description

technical field [0001] The invention discloses a method for increasing the denitrification efficiency of a biofilm packing tower used for simultaneous desulfurization and denitrification of flue gas by adding a rare earth enhancer, and belongs to the technical field of biological method industrial waste gas purification. Background technique [0002] As people study atmospheric SO 2 , NOx (nitrogen oxides) synergistically cause acid rain and its secondary pollution--further understanding of photochemical smog, SO emissions from industrial processes 2 , The harm of NOx, as a major problem of environmental pollution, is getting more and more attention. In recent years, with many developed countries and China's SO emissions from flue gas 2 , NOx and smoke and other pollutants control environmental protection legislation is becoming increasingly stringent, to seek technologically advanced, economically reasonable flue gas simultaneous desulfurization and denitrification techno...

AI Technical Summary

Problems solved by technology

This type of complex flora dominated by autotrophic bacteria usually grows slowly (especially the denitrification flora grows slowly)

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