Introduction:
Farm sewage mainly includes urine, some feces and flushing water, which is a high-concentration organic sewage, and contains a large amount of suspended solids and ammonia nitrogen. After this untreated sewage enters the natural water BODy, it will increase the content of suspended solids, organic matter and microorganisms in the water, change the physical, chemical and biological community composition of the water BODy, and deteriorate the water quality. Sewage also contains a large number of pathogenic microorganisms that will spread through the water BODy, endangering the health of humans and animals.
Features
Aquaculture sewage has typical "three high characteristics", that is, the concentration of organic matter is high, COD is as high as 3000-12000mg/l, ammonia nitrogen is as high as 800-2200mg/l, the suspended matter is more than ten times of SS, the color is deep, and it contains a large number of bacteria, ammonia nitrogen , High organic phosphorus content, good biodegradability, large impact load.
Solution
Farm wastewater treatment methods can be simply summarized into physical treatment, chemical treatment and biological treatment. Biological treatment is applied, that is, the organic matter in sewage is mainly converted into new microbial cells and simple forms through the life process of microorganisms. Inorganic matter, so as to achieve the purpose of removing organic matter.
The waste water flows into the grid tank by itself, and its function is to remove solid suspended matter in the sewage, and then the waste water flows to the regulating tank, where the water quantity and quality are effectively regulated in the regulating tank, and then it is sent into the anoxic pool by the lifting pump. In the anoxic pool, the sewage After anaerobic digestion, some pollutants are removed, and some refractory organic substances are converted into easily degradable substances, which is beneficial to aerobic digestion.
After flowing into the aerobic tank, a large number of active biofilms are adsorbed on the filler. Under the condition of sufficient oxygen, the bacteria in the biofilm swallow a large number of organic pollutants in the sewage, carry out metabolism, and remove the organic pollutants in the water to the greatest extent.
The suspended matter in the water settles into the sludge hopper, and after being concentrated for a period of time in the hopper, the sludge is regularly returned to the regulating tank, and the remaining sludge is discharged into the drying tank for drying and recycling, and the effluent is processed through the facultative tank Discharge up to standard after subsequent treatment.