Biological filtering device for treating toluene gas

Abstract

The invention discloses a biological filtering device for processing gaseous toluene, which is characterized in that: a nutrient solution nozzle of a nutrient solution dropwise system is arranged on the top of a biological filter, the outlet of a gas supply system is connected with the air inlet at the upper end of the biological filter through a pipeline, a water-bath constant temperature systemis arranged on the outside of the biological filter, one or more layers of integral biological precoats are arranged in the housing of the biological filter, the biological precoat is supported by a sieve plate on the bottom of each layer, the filtration medium of the biological precoat adopts uniform integral material, the porosity of the material is 90 to 98 percent, the aperture is 1 to 10mm, the opening rate is above 95 percent, the tensile strength is more than 5000Pa, the compressive strength is more than 1000Pa, the bulk density is 20 to 600kg / m<3>, and the specific surface area is 100to 1000m<2> / m<3>; an air vent and a drainpipe communicated with the outside are arranged on the bottom of the biological filter. The biological filtering device has the advantages of simple and compact structure, good toluene removal effect, low cost, long running period, no secondary pollution, and convenient maintenance.

Description

technical field [0001] The invention mainly relates to the technical field of low-concentration organic waste gas treatment, in particular to a biological filter device for treating toluene gas. Background technique [0002] Volatile Organic Compounds (VOCs for short) refer to organic compounds whose saturated vapor pressure is greater than 70Pa at normal temperature and whose boiling point is within 260°C at normal pressure. The main components are hydrocarbons, oxygenated hydrocarbons, halogenated hydrocarbons, Nitrogen and sulfur hydrocarbons, etc. The concentration of volatile organic compounds emitted during industrial production and waste treatment is low in most cases, and usually the value of the organic matter is not high, or the composition is complex, and most VOCs have pungent odors such as stench. It is toxic to humans and various animals and plants, and has the "three causes" of carcinogenic, teratogenic, and mutagenic effects, and it can also interact with NO...

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Problems solved by technology

[0005] Biofilters have been successfully applied to the treatment of low-concentration toluene gas, but there are still the following main problems in specific operations: 1) uneven distribution of biofilm, organic load, nutrients, water, etc.; 2) usually not suitable for Short empty bed contact time degrades high-load organic gases; 3) Excessive biofilm accumulation in the medium

[0007] Although the traditional biofilter using organic filler can achieve high removal efficiency when dealing with low concentration toluene gas, with the prolongation of the operation time and the slow compaction of the accumulated filler in the filter, there is a problem in the filler. Insufficient nutrients, increased pressure drop and other defects, so it is still necessary to optimize the selection of fillers, apply more advanced filter fillers and adopt better arrangements to overcome and reduce the clogging of fillers encountered in traditional biological trickling operations , Humidity is difficult to control and nutrient distribution is limited and many other problems

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