1. Principle of biological deodorization process
After the odor from each odor source point is collected by the negative pressure of the gas collection system, it is pumped by the centrifugal fan and directly introduced into the washing-biological filter bed deodorization equipment. The front-stage washing bed has the functions of effectively removing dust, adjusting the humidity temperature of odor, reducing the impact of peak concentration, and removing some water-soluble substances. behind
In the multi-stage biological filter bed, the odor is degraded by a variety of microorganisms through gas-liquid and liquid-solid mass transfer.
The sulfur-containing series of odors are oxidized and decomposed into S, SO32-, and SO42-. The function of sulfur-oxidizing bacteria is to remove sulfur compounds such as hydrogen sulfide, methyl mercaptan, and methyl sulfur.
The nitrogen-containing series of odors are oxidized and decomposed into NH4+, NO2-, and NO3-. The role of nitrogen-forming bacteria such as digestive bacteria is to remove nitrogen from the odor components.
H2S+O2+ Autotrophic sulfur-forming bacteria+CO2 →Synthesize cell material+SO42—+H2O
CH3SH→CH4+H2S→CO2+H2O+SO42—
When the odorous gas is NH3, ammonia first reacts with water to generate ammonia water, and then is converted into nitric acid through nitrification by nitrite bacteria and nitrate bacteria under aerobic conditions. Under facultative anaerobic conditions, nitrate reducing bacteria reduce nitrate to nitrogen.
Nitrification: NH3+O2→ HNO2+H2O
HNO2+O2→ HNO3+H2O
Denitrification: HNO3→ HNO2→ HNO→ N2O→ N2
The rear filter bed can be optionally configured according to the exhaust gas source conditions to enhance treatment. (Such as activated carbon adsorption deodorization, plant liquid deodorization, etc.)
2. Process flow chart
Schematic diagram of the internal FRP+ steel structure of the biological deodorization equipment
3. Characteristics of biological purification equipment
1) The biofiller has strong microbial activity and long service life.
It has the characteristics of large surface area, easy growth of biofilm, corrosion resistance, biodegradation resistance, good moisturizing performance, high porosity, small pressure loss and good air and water distribution, and its service life can reach 8-10 years.
2) The equipment is easy to operate and realizes automatic control
The process operation is fully automatic according to PLC settings, with stable operation and no management. It can run continuously for 24 hours and is also suitable for intermittent operation.
3) Low energy consumption in operation
Due to the good moisturizing performance of this filler, the spray water runs intermittently and the water consumption is small. The filler itself is resistant to biological corrosion, has no wear and tear, and can operate stably for a long time.
4) Deodorization process, reasonable and no secondary pollution
