A device and method for realizing simultaneous denitrification and phosphorus removal of urban sewage with low carbon-to-nitrogen ratio without additional carbon source

Abstract

The invention relates to a device and method for realizing synchronous denitrification and dephosphorization of urban sewage with low carbon-to-nitrogen ratio without external carbon source, belonging to the field of sewage biological treatment. Pump urban sewage into the anaerobic / aerobic / anoxic SBR reactor, aerate and stir after anaerobic stirring for 120-240 minutes; the DO concentration in the anaerobic / aerobic / anoxic SBR reactor is 0.5-1mg / L, online monitoring of pH value change curve in the reactor during the aeration and stirring stage, stop the aeration in time when the pH value changes to the lowest point, and then carry out anoxic stirring; online monitoring of the pH value change curve in the reactor during the anoxic stirring stage, When the pH value changes to the highest point, the anoxic stirring is stopped; the precipitation is drained, and the drainage ratio is 0.2-0.4. The anaerobic / aerobic / anoxic SBR reactor needs to discharge sludge during operation to maintain the sludge concentration within the range of 2000-4000mg / L. The method realizes simultaneous denitrification and phosphorus removal of urban sewage with low carbon-to-nitrogen ratio under the condition of no external carbon source, saves oxygen consumption and energy consumption, reduces urban sewage treatment costs, and improves nitrogen and phosphorus removal efficiency.

Description

technical field [0001] The invention relates to the technical field of sewage biological treatment, in particular to a device and method for realizing synchronous denitrification and dephosphorization of urban sewage with low carbon-to-nitrogen ratio without an external carbon source. Background technique [0002] The nitrogen and phosphorus removal of sewage has always been a hot spot in the field of sewage research, and the research on existing sewage treatment processes is also developing in the direction of high efficiency and low energy consumption. Short-cut nitrification technology is an efficient way to convert ammonia nitrogen. Endogenous denitrification technology uses the internal carbon source stored in activated sludge in the anaerobic stage for denitrification, realizing zero addition of organic carbon source in the denitrification process and strengthening biological removal. Phosphorus is an economical and efficient way to remove phosphorus. [0003] Due to ...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a device and method for synchronous denitrification and dephosphorization of urban sewage with low carbon-to-nitrogen ratio without additional carbon source, to realize high-efficiency, energy-saving synchronous denitrification and dephosphorization of urban sewage with low carbon-to-nitrogen ratio, and to solve the problem of traditional denitrification In the phosphorus removal process, there are problems such as insufficient carbon source, nitrogen and phosphorus removal can not be optimal at the same time, the process flow is simple, and the operating cost is low

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