Method for integrally treating VOCs (Volatile Organic Chemicals)-containing waste gas by biofilter

Abstract

The invention relates to a method for integrally treating VOCs (Volatile Organic Chemicals)-containing waste gas by a biofilter. The method comprises the following steps: (1) mixing volcanic, activated carbon, decomposed mushroom residue and active mushroom residue, thus preparing composite filler; (2) piling and charging the composite filler onto a porous plate in the biofilter, thus forming a composite filler layer; (3) humidifying fresh air, introducing the humidified air into the biofilter, operating for 48 to 60 hours under the condition of room temperature, and completing starting; (4) humidifying the VOCs-containing waste gas, introducing the humidified VOCs-containing waste gas into the biofilter, operating for 14 to 16 hours under the condition of the room temperature, and completing acclimation; regulating the gas residence time to be 8 to 12 seconds, and continuously operating. The composite filler used in the method is not liable to collapse and compact, is long in replacement period and has good buffer ability and high stability; during treatment of the VOCs-containing waste gas, starting and acclimating periods are short, a nutrient solution requires not to be additionally inoculated and supplemented, the removal effect is good, the cost is low, the operation and maintenance are simple and convenient, and good economic benefit and good environmental benefit are obtained.

Description

technical field [0001] The invention belongs to the technical field of VOCs waste gas treatment, and in particular relates to a method for integrated treatment of VOCs-containing waste gas by adopting a biological filter. Background technique [0002] Volatile Organic Compounds (Volatile Organic Compounds, VOCs) can easily lead to photochemical smog and secondary organic aerosols, which are the main source of haze weather and O 3 It is a key precursor substance that is emitted, and its emission control is crucial to the protection of air quality. In addition to environmental effects, VOCs can also cause harm to human organs such as the heart, lungs, liver, and nervous system, causing acute and / or chronic poisoning of human organs, and even carcinogenic and mutagenic effects, which are extremely harmful to human health. The emissions of VOCs in my country's industrial processes are very large, exceeding NOx and SO 2 Total emissions. Among them, industrial activities such a...

AI Technical Summary

Problems solved by technology

[0005] The bioreactors commonly used in biofiltration technology mainly include biofilters, biotrickling filters and bioscrubbers. The first two are widely used and have similar processes. The biggest difference is that biofilters use organic fillers and do not require continuous nutrient supplementation. The operating cost is low, but the indigenous microorganisms of the organic filler take a long time to domesticate, and biodegradation is easy to occur, resulting in compaction of the filler, increased pressure loss, and reduced removal effect; the biotrickling filter uses inorganic fillers, which are inert and can maintain a low pressure drop for a long time. It has advantages in preventing the accumulation of metabolites and controlling biomass. However, since the inorganic filler does not contain indigenous microorganisms and cannot provide nutrients for the growth of microorganisms, it needs to be inoculated with bacteria when starting, and the startup speed is slow. During operation, it needs to continuously supply liquid phase to supplement nutrients, increasing In addition to the difficulty of operation and operating costs, and both of the above are not effective in removing hydrophobic organic pollutants

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