System and process for treating waste gas employing bio-treatment technology

Abstract

A system and process of bio-treatment for enhancing the efficiency of treating waste gas is disclosed. This technology relates to an application of a dust / grease filtering device, a two-way directionally gas inlet system, a bioaerosol removal device, and a cell immobilization technology, to a conventional bioreactor for treating waste gas. The dust / grease filtering device is formed by fillers which form pores being less than 100 mesh, in order to efficiently remove the majority of dust / grease existing in the waste gas, and reduce the pressure drop of the reactor. The two-way directionally gas inlet system can control the direction of the gas flowing into the bioreactor, in order to efficiently control the pressure drop, and the variation of pH value and the humidity in the reactor. The cell immobilized technology makes a connection between support and microorganisms offering the biological reaction, in order to enhance the activity and living percentage of the microorganisms in the biotrickling filter, and reduce the emission of the bioaerosol. The bioaerosol removal device is filled with the fillers having the function of sterilization. After the waste gas is treated and before it is exhausted to the environment, the filler may remove the bioaerosol existing therein, thereby improving the safety and widening the application field of the waste gas bio-treatment system.

Description

[0001] The present invention relates to an improved waste gas treatment system and process.DESCRIPTION OF THE RELATED ART[0002] Conventional biological technology for treating waste gas, such as a biofilter and a biotrickling filter, can only deal with the waste gas having little or no dust / grease. When the waste gas to be treated contains dust / grease, it will clog the biofilter, reduce the activity of the microorganisms (or activated sludge), cause the short flow of the reactor, increase the pressure loss, decrease the treating efficiency and shorten the service life of the bioreactor. Therefore, the conventional biological technology for treating waste gas is often limited to the application of treating waste gas in a specific field.[0003] Nowadays the types for waste gas entering a bioreactor include "flow upward (i.e., flowing upward from the bottom of the reactor)" and "flow downward (i.e., flowing downward from the top of the reactor)." The type of "flow upward" can better con...

AI Technical Summary

Problems solved by technology

Conventional biological technology for treating waste gas, such as a biofilter and a biotrickling filter, can only deal with the waste gas having little or no dust / grease.

When the waste gas to be treated contains dust / grease, it will clog the biofilter, reduce the activity of the microorganisms (or activated sludge), cause the short flow of the reactor, increase the pressure loss, decrease the treating efficiency and shorten the service life of the bioreactor.

Therefore, the conventional biological technology for treating waste gas is often limited to the application of treating waste gas in a specific field.

However, for the type of "flow upward," it is not easy to control the humidity of the filter materials, which often causes the deficiency of the humidity for the filter materials at the inlet of the reactor.

In addition, because the type of "flow upward" takes an opposite direction with respect to the normal water flow, the distribution of the gas flowing into the reactor is even worse, which will result in the phenomenon of short flow (i.e., the gas fails to flow through the whole cross section of the biofilter, but only flows through the passages having least resistance), and decrease the whole removal efficiency of the system.

However, because the type of "flow downward" takes a same flowing direction as the gravity, the filter materials can be denser, which increases the resistance for the gas flowing therethrough and therefore forms a greater pressure loss, and increases the operational cost and the maintenance cost of the inlet fan.

If the microorganisms in the reactor are not microorganisms commonly seen indoors or outdoors, it may be harmful to the environment and even to the human's life when its numbers exceeds a certain extent.

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