Ammonia nitrogen wastewater denitrification treatment method

Abstract

The invention discloses an ammonia nitrogen wastewater denitrification treatment method, and solves the troubled problem of incomplete removal of nutrient elements of N, P, etc. in city tail water according to the characteristics of the city tail water. The method is characterized by that ammonia nitrogen wastewater is subjected to a series process of an anoxic denitrification biological filter and an aerobic nitrification biological filter, then is subjected to sedimentation treatment in a mechanical stirring clarification pool, and then is filtered in a sand filter to remove suspended solidsand some bacteria and microorganisms in the water, and the obtained filtrated water is subjected to ultrafiltration reverse osmosis system treatment. According to the method, a combined technology ofdenitrification and dephosphorization of the denitrification-nitrification biological filters, coagulation, disinfection, filtration, ultrafiltration and reverse osmosis is used, and the nitrification process is controlled at a short-term stage through addition of a nitrifying bacteria inhibitor into the nitrification filter, so that the problems that power plant aeration energy consumption is large, carbon source is in insufficient, service life of ultrafiltration membranes and reverse osmosis membranes is short, and the likes are solved, thereby providing a technical support for the economical use of the city tail water by the power plants.

Description

technical field [0001] The invention relates to wastewater treatment, in particular to a method for denitrification treatment of ammonia nitrogen wastewater. The treated wastewater can be used as water for power plant boilers, and belongs to the technical field of sewage treatment. Background technique [0002] my country has always been a big country with shortage of water resources. Thermal power generation is the main source of power generation in our country, making power plants a major water consumer in our country. In order to alleviate the current situation of water shortage in my country, the reuse of urban sewage is the main way to solve this problem. This move can not only expand the scale of urban sewage reuse, but also provide sufficient water and stable water quality for power plants. [0003] In power production, impurities in water have a great impact on water treatment equipment and thermal equipment. The effluent of municipal secondary cities still contain...

AI Technical Summary

Problems solved by technology

However, the regulation of this method on the short-range denitrification process is to use the difference in physiological and biochemical conditions between the chemoautotrophic bacteria ammonia oxidizing bacteria AOB and the nitrite nitrogen oxidizing bacteria NOB, which oxidize ammonia nitrogen into nitrogen oxides. , pH, temperature, oxygen concentration and other environmental factors of organic matter are regulated, so that the growth rate of NOB is significantly lower than that of AOB, and NOB is washed out with water gradually to achieve stable accumulation of nitrite nitrogen; in actual operation Substrate concentration, pH, and temperature process control are complex, difficult to accurately control, and difficult to solve the problem of insufficient carbon sources

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