Apparatus and method for denitrifying sludge peptic juice and stabilizing sludge for municipal sewage plant

Abstract

The invention discloses a sludge digestion liquid nitrogen removal and sludge stabilization device used in municipal wastewater treatment plants and a method. The device is provided with a digestion liquid tank, a nitration tank, an aerobic sedimentation tank, an effluent tank, a sludge stabilization tank, an anaerobic sedimentation tank, a middle water tank and a sludge tank. The method comprises the following steps: the system starts up; the sludge stabilization tank is filled with the water aeration tank effluent in the effluent tank; the mixture in the sludge stabilization tank enters the aerobic sedimentation tank for sludge-water separation; when the NO3- in the effluent of the sludge stabilization tank is more than -N which is more than 5 mg / L, the sludge is discharged; then newly deposited sludge is added, so that the sludge concentration MLSS can be maintained at 20-30 kg MLSS / m3. The device of the invention is suitable for municipal sludge disposal and has perfect structure and technology, high efficiency, good effect, as well as low equipment and operating costs.

Description

technical field [0001] The invention belongs to the technical field of high-ammonia-nitrogen wastewater and sludge biological treatment, specifically a nitration reaction of high-concentration ammonia-nitrogen in the digested liquid of an urban sewage treatment plant, and then the volatile fatty acid produced by the hydrolysis and acidification of the primary sludge of the urban sewage treatment plant VFA is an organic carbon source, a device and method for synchronously realizing denitrification of sludge digestion liquid and stabilization of sludge, and is suitable for biological denitrification and sludge disposal of wastewater with high concentration of ammonia nitrogen and low carbon to nitrogen ratio (C / N). Background technique [0002] my country's water pollution continues to intensify, and the phenomenon of eutrophication caused by the excessive accumulation of nitrogen and phosphorus in natural water bodies continues to erupt. Social development. Therefore, improvi...

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Problems solved by technology

For denitrification of urban sewage where the raw water carbon source is lacking, the reflux of digested liquid intensifies the lack of carbon source, making it difficult to improve the efficiency of nitrogen and phosphorus removal

The metabolic characteristics of anaerobic digestion of sludge and the traditional process of returning sludge digested liquid directly to the sewage system is a major but often overlooked crux of the low denitrification efficiency of many sewage treatment plants

[0005] For urban sewage with low C / N, the lack of carbon source is the barrier that cannot improve its denitrification efficiency, and the addition of carbon source will greatly increase the cost of sewage denitrification

At the same time, the reasonable disposal of a large amount of sludge generated in the sewage treatment process is a costly and difficult process, and its construction cost accounts for about 40% of the total cost of the entire sewage treatment plant.

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