Hydrolysis denitrification denitrification system and method

Abstract

A hydrolysis denitrification denitrification system and method. The system replaces the traditional anoxic tank with an upflow sludge bed hydrolysis reactor. The hydrolysis reactor includes: an effluent return channel, which is arranged between the sedimentation tank and the hydrolysis reactor, so that the discharged water from the sedimentation tank contains The nitrate supernatant is used as reflux to flow back into the hydrolysis reactor for hydrolysis, denitrification and denitrification. In the present invention, the hydrolysis reactor is used as the functional area of ​​pre-denitrification denitrification, and the good anaerobic environment in the hydrolysis reactor, the rapid recovery ability of the denitrification bacteria function and the sufficient supply capacity of organic matter are used to realize efficient and stable hydrolysis reaction. Nitrification and denitrification. The invention makes full use of the carbon source in the sewage, improves the denitrification efficiency, and reduces the energy consumption of the whole sewage treatment process. The invention can be combined with common urban sewage treatment processes such as AAO and oxidation ditch, and is convenient for upgrading and reforming existing facilities of sewage treatment plants.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a denitrification denitrification system and method. Background technique [0002] With the eutrophication of water caused by nitrogen and phosphorus pollution becoming more and more prominent, especially after the outbreak of cyanobacteria in Taihu Lake in 2007, the water quality requirements for the effluent of urban sewage treatment plants in the Taihu Lake Basin meet the national "Urban Sewage Treatment Plant Pollutant Discharge Standard" (GB18918 -2002) Class A standard. In order to ensure that the nitrogen in the effluent reaches the standard, the urban sewage treatment plants generally add additional carbon sources, such as methanol, acetic acid, and sodium acetate, to the sewage treatment system. Although the discharge of wastewater reaches the standard, it also increases the operating cost of the system, which is obviously not in line with t...

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Problems solved by technology

The use of hydrolysis reactors has alleviated the common problems of urban sewage in my country, such as high content of suspended solid inorganic components in influent water, poor biodegradability of wastewater and unfavorable biological utilization, etc.

However, in practice, it has been found that if a hydrolysis reactor is not installed before anaerobic treatment, the biodegradability of the influent and the activity of the activated sludge are often too low. The high removal rate of organic matter exacerbates the problem of insufficient denitrification carbon source in the subsequent anoxic treatment, which makes it difficult for the total nitrogen in the effluent to reach the standard

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