Device and method for controlling autotrophic/heterotrophic deep denitrification process

Abstract

The invention discloses apparatus and method for autotrophic deep denitrification of urban sewage. According to the apparatus and method for autotrophic deep denitrification of urban sewage, urban sewage enters a biological organic-matter-removing and phosphorus-removing reactor through a raw water tank, and anaerobic agitation is performed on the urban sewage so as to be subjected to phosphorus release effects; aerated agitation is performed so as to adsorb organic matters in the sewage with activated sludge; aerobic phosphorus absorption is performed so as to remove phosphorus from the sewage; the phosphorus-removed sewage enters a short-cut nitrification reactor through a first intermediate water tank, and short-cut nitrification is partially realized by controlling the dissolved oxygenconcentration at 0.5 mg / L or lower; the water discharged from the short-cut nitrification reactor enters a second intermediate water tank, and water is synchronously fed into the second intermediatewater tank from the raw water tank so as to obtain a mixture; and then, the mixture enters a short-cut denitrifying anaerobic ammoxidation reactor. By adopting low-oxygen-content aeration and partialshort-cut nitrification during denitrifying process, the apparatus and method for autotrophic deep denitrification of urban sewage are capable of saving aeration amount; moreover, deep denitrificationis carried out by utilizing raw-water carbon source, so that total nitrogen concentration of the discharged water is low. In addition, organic matter in the sewage is removed by the biological organic-matter-removing and phosphorus-removing reactor by utilizing the adsorption effects of the activated sludge, so that the organic matter in the sewage is used for producing methane by performing anaerobic fermentation to the maximum extent; and thus, highly efficient recycling of sewage energy is realized.

Description

technical field [0001] The invention relates to an autotrophic / heterotrophic deep denitrification process control device and method, belonging to the technical field of sewage biological treatment. Background technique [0002] my country's economy is developing rapidly, and the urbanization process is accelerating. At the same time, the requirements for environmental protection are gradually increasing, and the sewage treatment rate of urban sewage treatment plants continues to rise. In the traditional sewage treatment process, nitrogen in sewage is generally removed by nitrification and denitrification process. The nitrification process requires a large amount of oxygen supply, and the denitrification process requires a large amount of carbon source. However, the available carbon source of urban sewage is insufficient, so additional investment is required. Only by adding carbon sources such as methanol and ethanol can the effluent meet the standard, which leads to problems...

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Problems solved by technology

[0005] The object of the present invention is to solve the problem of poor stability of urban sewage effluent and high energy consumption, and proposes a device and method for autotrophic / heterotrophic deep denitrification process control. The method and device firstly use the organic matter in the sewage for Biological phosphorus removal, at the same time, enrich organic matter into sludge through biosorption, and then anaerobic fermentation of the remaining sludge to produce methane, thereby improving energy recovery; then, sewage enters part of the short-range nitrification reactor, using ammonia nitrogen and The online nitrite detector stops the aeration in time to ensure the stability of the effluent; finally, the sewage and a part of the raw water enter the short-range denitrification anammox reactor for short-range denitrification and anammox reaction, making full use of the raw water Deep denitrification of carbon sources reduces the total nitrogen concentration of the effluent

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