Biological method for malodorous gases from the development of the history of the bio-drip filtration , bio-washing to bio-filtration multiple process evolution, the current market-tested biological deodorization equipment is mainly combined biological washing-filtration method.
This method integrates the advantages of the previous generation of technology, through the improvement of packing, spraying method and water circulation system design, etc., to solve the traditional biological method is difficult to cope with the high load of waste gas odor, packing clogging, waste of water and electricity resources, high operating costs, long time running after the acidification of the system and other problems.
The equipment consists of fan 1, nutrient circulation area 2, air distribution area 3, biological filler area 4 and mist removal area 5. Incoming gas through the fan through the duct 1a (size according to the actual processing air volume decision) into the air distribution area, the area is arranged with a manometer 3a one end of the interface, used to measure the pressure of the gas into the filler before the size of; air distribution area on the lower side of the nutrient cycle area, the area is equipped with a pH meter 2a used to monitor the circulating liquid acidic and alkaline degree of liquid discharge valve 2b used for the discharge of waste liquids, circulating liquids through the circulating pump 2c to elevate the filler 2d for spraying. Above the nozzle 2d for spraying, nozzle angle of 120 °, pipeline with flow meter 2e; gas through the air distribution area into the biological filler area, the area consists of a barrier 4a and biological filler layer 4b; through the biological filler area into the demisting area, the area access to the back end of the manometer to measure the pressure of the gas flowing through the biological filler after the gas, above the setting of the gas-liquid separator 5a, the outside of the nozzle access holes 5b, after demisting the gas standard discharge. After demisting, the gas is discharged according to the standard. Nutrient circulation area, air distribution area, biological filler area and mist removal area **** with the composition of the device box.
Combined biological scrubbing - filtration deodorization device structure schematic
Biological treatment of odor pollutants is as follows:
1) the dissolution process of malodorous gases. Exhaust gas and water or solid-phase surface of the water film contact, pollutants dissolved in water to become molecules or ions in the liquid phase, i.e., the transfer of malodorous substances from the gas phase to the liquid phase, this process is a physical process, following Henry's law;
② malodorous substances adsorption, absorption process. The malodorous components in the aqueous solution are adsorbed and absorbed by microorganisms, and the malodorous components are transferred from the water to the microorganisms. As an absorbent water is regenerated and recovered, and then used to dissolve new components of the exhaust gas. The adsorbed organic matter is biotransformed, i.e., the solubilization of insoluble and colloidal organic matter by microbial extracellular enzymes before it is successively taken into the body by microorganisms. Such as starch, proteins and other macromolecules in the microbial extracellular enzymes (hydrolases), is hydrolyzed to small molecules before entering the cell body. It can be seen that when the microbial surface in the form of sludge or membrane once covered by organic matter through adsorption, its further adsorption will be limited, and thus the need to update the surface of the membrane or constantly replenish the microbial colloid with adsorption capacity, in order to ensure the smooth progress of the process;
3 ③ Biodegradation of malodorant substances. Into the microbial cells of the malodorous components as microbial life activities of energy or nutrients are decomposed and utilized, so that the pollutants can be removed. Hydrocarbons and other organic components are oxidized and decomposed into CO2 and H2O, sulfur-containing reducing components are oxidized into S, SO42-; nitrogen-containing components are oxidized and decomposed into NH4+, NO2-, and NO3-.
Biofilm Principle Diagram