Method for coupling composite biological nitrogen removal with enhanced biological phosphorus removal

Abstract

The invention discloses a method for coupling composite biological nitrogen removal with enhanced biological phosphorus removal, and belongs to the field of biological sewage treatment. Through the combined action of autotrophic nitrogen removal and heterotrophic nitrogen removal such as short-cut nitrification, anaerobic ammonia oxidation and denitrification, a large number of carbon sources can be saved while nitrogen removal is performed, and the aim of synchronous nitrogen and phosphorus removal is achieved by coupling an enhanced biological phosphorus removal process. The method solves the problem of nitrogen and phosphorus removal of the domestic sewage with low carbon nitrogen ratio under mainstream conditions, does not need additional carbon sources and chemical agents, saves the cost, and has no secondary pollution; hRT is low, the size and occupied area of a sewage treatment structure can be saved, and the investment and construction cost is reduced; through organic combination of autotrophic nitrogen removal and heterotrophic nitrogen removal, the system has better impact load resistance when coping with inflow water quality fluctuation, so that low consumption, high efficiency and stability in operation of the system can be ensured, the operation and maintenance are simple, engineering application and popularization are easy, and a clean, high-efficiency, low-consumption and stable technical scheme is provided for simultaneous nitrogen and phosphorus removal of domestic sewage.

Description

technical field [0001] The invention relates to a method for compound biological denitrification coupled with enhanced biological phosphorus removal, which belongs to the field of sewage biological treatment. Background technique [0002] my country's urban sewage is a typical sewage with low carbon-to-nitrogen ratio. The denitrification and phosphorus removal of sewage treatment plants generally has the disadvantages of high consumption, low efficiency and unstable operation. Especially for sewage treatment plants with low carbon-to-nitrogen ratio, the denitrification and phosphorus removal process itself There are also issues such as competition for carbon sources. Traditional wastewater treatment processes are often difficult to remove nitrogen due to insufficient carbon sources. However, the demand for carbon sources in biological phosphorus removal will intensify the competition between nitrogen-removing bacteria and phosphorus-removing bacteria for carbon sources, resu...

AI Technical Summary

Problems solved by technology

Xu et al. [1] When the temperature is 30°C, the integrated short-range nitrification and denitrification, anammox and bio-enhanced phosphorus removal reactors are operated to treat simulated domestic sewage, the total nitrogen removal rate can reach 89%, and the anammox activity is maintained at 43 to 54mg / (gVSS·d) (when converted to 20°C), since most of the sewage treatment plants in the world are located in temperate regions, the temperature of domestic sewage is mostly 10°C to 25°C, so the high temperature operating condition of 30°C in this document is limited In addition, the HRT of this process is as long as 24h, and a longer HRT means a larger floor area and investment cost

In addition, under the mainstream conditions of low ammonia nitrogen concentration (200mg / gVSS d)

Images