Device and method for treating urban domestic sewage by fully utilizing raw water carbon source for multiple water inflows

Abstract

The invention discloses a device and a method for treating urban sewage through a repeated-water-inlet SBR by fully utilizing a carbon source in raw water, and belongs to the field of biological sewage treatment through a biochemical method. The device comprises a raw water box, a sequencing batch reactor (SBR) and a computer. The method comprises the following steps: feeding urban sewage into the SBR, and then performing stirring and aeration; repeating the stirring and aeration for 2-3 times; after the final aeration is finished, continuously performing stirring, precipitating and water discharging. In the stirring processes, the pH values of denitrification ending points are monitored in a real-time time, and in the aeration processes, the DO and pH values of shortcut nitrification ending points are monitored in a real-time manner. The carbon source in the raw water is fully utilized for denitrification, one part of organic matters in the raw water is directly utilized, and the other part of organic matters is stored into sludge to be used as an internal carbon source to be utilized by the denitrification reaction in the final stirring process. The anoxic denitrification time and the aerobiotic aeration time can be accurately controlled, the utilization rate of the carbon source in the raw water and the total nitrogen removal rate are improved, and the energy consumption is reduced.

Description

technical field [0001] The invention relates to an SBR biological treatment process and device for nitrogen-containing wastewater, especially capable of making full use of carbon sources in raw water and realizing real-time control of the process, and belongs to the technical field of urban domestic sewage biological treatment. Background technique [0002] In the "Pollutant Discharge Standards for Urban Sewage Treatment Plants" (GB18918-2002) promulgated by my country in 2002, the first-level A standard requires that the effluent water quality of the sewage unit should be less than 50 mg / L for COD, less than 5 mg / L for ammonia nitrogen, and less than 15 mg / L for total nitrogen. , total phosphorus is less than 0.5mg / L. Many sewage plants in China cannot meet the standard discharge of total nitrogen. How to improve the denitrification effect is an urgent need in the field of urban sewage treatment at this stage. [0003] Biological denitrification of sewage by nitrification t...

AI Technical Summary

Problems solved by technology

However, in the traditional SBR treatment process, nitrification and denitrification are often incomplete or the reaction time set according to experience is too long to waste unnecessary time and energy.

[0005] The traditional aerobic / anoxic operation mode in the SBR process makes the carbon source in the raw water removed during the aeration process, which wastes the carbon source. To achieve the purpose of deep denitrification, it is necessary to add a large amount in the denitrification process carbon source, increasing operating costs

However, the anoxic / aerobic mode of operation is due to the presence of nitrate nitrogen and nitrite nitrogen in the effluent, so that the total nitrogen in the effluent cannot meet the standard.

Images