Method and basic principle of waste gas treatment:
(1) dilution diffusion method
Principle: the smell of gas through the chimney to the atmosphere,
or diluted with no odor, reducing the concentration of odor
substances to reduce the smell. Scope of application: applicable to
the treatment of low concentration of the odor of the odor of the
organization. Advantages: low cost, simple equipment.
Disadvantages: vulnerable to meteorological conditions, the stench
(2) water absorption method
Principle: the smell of certain substances soluble in the
characteristics of the water, the odor components directly in
contact with water, and dissolved in water to deodorization
purpose. Scope of application: water soluble, there is the
organization of the source of emissions of odor gases. Advantages:
simple process, easy management, low cost of operation of the
equipment to produce two pollution, the need to deal with the
Disadvantages: low purification efficiency, should be used in
combination with other technologies, the effect of the treatment of
thiol, fatty acid, etc..
(3) aeration activated sludge process
Principle: the odor material is dispersed in the mixed solution of
the activated sludge by aeration, and the application scope of the
suspended growth of the microorganism is wide. Scope of
application: as of 2013, Japan has been used for waste disposal
field, sewage treatment plant odor treatment. Advantages: activated
sludge after domestication, no more than the limit of the amount of
odor components, the removal rate of up to 99.5%. Disadvantages:
limited by the intensity of aeration, the application of this
method has some limitations.
(4) multi medium catalytic oxidation process
Principle: solid filler special reaction tower packing, packing
inside the compound multi medium catalyst. When the malodorous
gases in the role of induced draft fan through packing layer, and
through a special nozzle is divergent spray liquid phase compound
oxidant on the surface of the solid packing full contact and under
the catalysis of a multicomponent catalyst, malodorous gas
pollution factor be fully decomposed.
Scope of application: a wide range of application, especially
suitable for the treatment of large amount of gas, high
concentration of waste gas, the hydrophobicity of the material has
a good removal rate. Advantages: small area, low investment, low
operating cost; management convenient, that is, open and use.
Disadvantages: impact load, not easy to change the concentration of
pollutants and temperature changes, the need to consume a certain
amount of the agent.
(5) low temperature plasma
Low temperature plasma is following: solid, liquid and gas of the
fourth state of matter, when the applied voltage is reached, the
gas ignition voltage, molecular gas breakdown, produces a mixture
of electrons, ions, atoms and radicals, including. Although the
electron temperature is very high, the temperature of heavy
particle is very low, and the whole system is in a low temperature
state, so it is called low temperature plasma.
Low temperature plasma degradation of pollutants is to use these
high-energy electrons, free radicals and other active particles and
the exhaust gas pollutants, molecular contaminants within a very
short period of time the decomposition of, and subsequent reaction
to achieve the purpose of pollutant degradation.
Low temperature plasma air purification equipment can significantly
control the pollution are: VOC, odor gas, odor gas, smoke, dust,
can also be used for disinfection and sterilization. Low
temperature plasma technology is a new purification process, do not
need any additives, do not produce waste water, waste residue, will
not lead to two pollution.