Standard treatment method and system for high-ammonia-nitrogen and low-carbon-nitrogen-ratio sludge drying liquid

Abstract

The invention provides a standard treatment method and system for a high-ammonia-nitrogen and low-carbon-nitrogen-ratio sludge drying liquid, wherein a processof pretreatment, anaerobic ammonia oxidation, deep denitrification MBR technology, advanced oxidation and activated carbon adsorption is adopted, a sludge drying liquid enters an anaerobic ammonia oxidation denitrification system, microelements and nutritive salt are added to enrich anaerobic ammonia oxidation bacteria, partial nitrogen removal is performed through short-cut nitrification-anaerobic ammonia oxidation reaction, after two-stage A / O deep ammonia removal is performed, follow-up treatment is performed through catalytic ozonation and activated carbon filtration, and effluent can be directly recycled. According to the invention, by adopting an anaerobic ammonia oxidation coupling two-stage A / O process and by utilizing the water quality characteristics of a sludge drying liquid, anaerobic ammonia oxidation bacteria are cultured and enriched, the anaerobic ammonia oxidation water inlet temperature is controlled, the ammonia oxidation reaction rate is increased, the nitrite accumulation amount is increased, sludge is efficiently intercepted from A / O process outlet water through an MBR flat sheet membrane, the occupied area of a secondary sedimentation tank is saved, the sludge concentration in the two-stage A / O system is effectively improved, the denitrification load is improved, and the effluent quality meets the first-stage A discharge requirement.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a method and system for treating sludge drying liquid with high ammonia nitrogen and low carbon to nitrogen ratio up to the standard. Background technique [0002] With the development of cities and industries, the production of sludge as a by-product of sewage treatment has increased dramatically. In general, a sewage treatment plant can produce 5-8 tons of sludge with a moisture content of 80% for 10,000 tons of domestic sewage, and 10-30 tons of sludge for 10,000 tons of industrial sewage. Calculated according to the unit output of 7 tons and 20 tons, respectively, in 2020, the amount of urban domestic sludge generated in my country will be 43.82 million tons, and the amount of industrial sludge generated will be 40 million tons, totaling 83.82 million tons. Contrary to the continuous increasing trend of sludge production, the harmless chemical rate of sludge in my co...

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Problems solved by technology

[0011] The present invention aims to solve the problems of low carbon-to-nitrogen ratio, high ammonia-nitrogen, small water volume, and high pollutant concentration in the sludge drying liquid. The existing conventional process needs to add a large amount of carbon source and requires a long residence time. It provides a The method and system for the treatment of sludge drying liquid with high ammonia nitrogen and low carbon nitrogen ratio meet the standard, adopts anaerobic ammonium oxidation coupling two-stage A / O process, and utilizes the water quality characteristics of sludge drying liquid to complete the cultivation of anammox bacteria and control Anaerobic ammonium oxidation inlet water temperature improves the reaction efficiency, and the MBR flat membrane is used to efficiently intercept sludge during the effluent process of the A / O process, saving the area occupied by the secondary sedimentation tank and effectively increasing the sludge in the two-stage A / O system Concentration, increase the denitrification load, so that the effluent water quality of this system can meet the discharge requirements of Class A

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