Excellent efficiency: The process exhibits a very high removal effect in the treatment of organic matter and ammonia nitrogen in the wastewater. When the total residence time exceeds 54 hours, the COD value of the effluent after biological denitrification treatment can be reduced to less than 100mg L after coagulation and precipitation, and other indicators also meet the emission standards, and the total nitrogen removal rate is as high as 70%.
2.Simplified and cost-effective: The process uses organic matter from wastewater as a carbon source for denitrification, eliminating the need for additional carbon sources such as expensive methanol. In particular, after the ammonia distillation tower is equipped with a device for defixing ammonia, the carbon-nitrogen ratio is increased, and the alkalinity generated in the denitrification process is reduced accordingly, thereby reducing the alkali consumption required for the nitrification process.
3.The anoxic denitrification process has a high degradation efficiency: in the anoxic section, the removal rates of COD, BOD5 and SCN- reach % and 59%, respectively. The removal rates of phenols and organics are 62% and 36%, respectively, so denitrification is considered the most economical and energy-efficient degradation process.
4.High volumetric load: due to the use of enhanced biochemical technology in the nitrification stage and the membrane technology of high-concentration sludge in the denitrification stage, the concentration of nitrification and denitrification sludge is effectively improved, and it has a higher volumetric load compared with similar foreign processes.
5.High resistance to load shocks: The process remains operational when the influent water quality fluctuates greatly or the concentration of pollutants is high. As a result, operational management is relatively simple. By comparing various processes, it is not difficult to see that the biological denitrification process can effectively degrade organic substances such as phenol, cyanide, and COD while removing nitrogen. Combined with the characteristics of water quantity and water quality, we recommend the use of anoxic aerobic (AO) biological denitrification (internal circulation) process, so that the sewage treatment device can not only meet the requirements of denitrification, but also other indicators can meet the discharge standards.
The biological contact oxidation method is a wastewater biological treatment method derived from the biofilm method, that is, a certain amount of filler is filled in the biological contact oxidation tank, and the organic matter in the wastewater is oxidized and decomposed through biological oxidation, so as to achieve the purpose of purification. It has the characteristics of activated sludge method, and the biofilm method has the advantages of both activated sludge method and biofilm method. Under biochemical conditions, it has achieved good economic benefits in the treatment of industrial wastewater, aquaculture sewage and domestic sewage. The process is widely used in sewage treatment systems in all walks of life because of its high efficiency and energy saving, small footprint, impact load resistance, and convenient operation and management.