Chicken wastewater is rich in ammonia nitrogen, so it is necessary to set up an anti-anoxic nitrate process, transform ammonia nitrogen into nitrite and nitrate nitrogen through nitrification of denitrifying bacteria, and complete nitrification under aerobic conditions. Denitrification is to reduce nitrate and nitrite nitrogen in anoxic environment to N2, and the function of the tank is to complete the denitrification process.
2-6. Automatic methane burning device: Due to the chicken sewage COD+BOD and high content of ammonia, the carbon with high COD content will produce toxic gas through the action of anaerobic bio-iron, which will bring problems to farms due to potential safety hazards. Methane gas produced by anaerobic hydrolysis accounts for 55-60%, and the rest is CO2 and a small amount of hydrogen sulfide gas. The stench emitted by this gas not only affects the surrounding environment and human health, but also is a flammable and explosive dangerous gas, which brings hidden dangers to the safety of farms. The process is automatic short torch burning of methane, aiming at eliminating toxic and harmful greenhouse gases and ensuring the reliability of short ignition of methane. A fully automatic electronic pulse ignition system is adopted, in which the company with 5.5-60% low calorific value I value of methane can realize ultra-low pressure full automatic combustion by using a patented invention-pressure automatic methane burner, and the energy can be used for the safe disposal of various methane. (See Voice of Natural Gas Treatment and Energy Utilization Scheme)
2-7. Intermediate tank: A large amount of suspended solids at the outlet of anaerobic bio-iron, mainly due to the loss of organic matter and activated sludge components from flocculation and decomposition of biofilm. The function of the intermediate tank is to return the sludge to the regulating sedimentation tank, mix it with water and enter the iron tank for anaerobic digestion of these remaining sludge, which is also to further improve the biochemical effect. Because the middle pond is anoxic, the nitrification and denitrification nitrogen is transformed into aerobic supernatant of Chen Yi pond.
2-8. Aerobic SBR tank: Generally, there are some defects in biochemical process, such as poor cell membrane connectivity and low effective concentration, so it needs long residence time and large structural volume. Generally, the effective concentration is below10/m. This technology adopts sequencing batch reactor (SBR) and uses powdered activated carbon activated sludge as carrier to increase biomass.
1. Biofilm is enriched by powdered activated carbon. First, organic matter, microorganisms and a large amount of dissolved oxygen are adsorbed on the surface, and microorganisms create a good environment.
2. Activated carbon adsorption and biological oxidation are in tandem, and activated carbon is an ideal biological carrier. With the gradual strengthening of biological activity, the effect of keeping the effective concentration at 107- 109/ml continues to increase.
3. Extend the service life of activated carbon. Using carbon membrane to treat aquaculture wastewater, the service life of activated carbon can reach 18 months or more.