Side biological treatment process for processing sludge-digestion liquid by adopting SNAD-MBBR technology as core

Abstract

The invention relates to a side biological treatment process for processing a sludge-digestion liquid by adopting an SNAD-MBBR technology as a core. The side biological treatment process mainly comprises two parts of coagulating sedimentation and SNAD-MBBR. Firstly, the sludge-digestion liquid enters a coagulating sedimentation tank, and a coagulant is fed to carry out flocculation reaction; thenwater without suspended matters discharged through a primary sedimentation tank enters a biological denitrification unit, wherein during the process, an organic carbon source and most nitrogen remained in the sludge-digestion liquid are effectively removed; finally, the treated sludge-digestion liquid is discharged into a sewage treatment tank. The side biological treatment process provided by theinvention has the advantages of low operation energy consumption, high treatment efficiency, low secondary pollution, small occupied area and the like, meanwhile, the nitrogen load impact on the sewage treatment plant is reduced, and the operating cost of a water plant is reduced. The side biological treatment process provided by the invention can become the preferred process for the side biological treatment of wastewater with high ammonia-nitrogen and low carbon nitrogen ratio.

Description

Technical field [0001] The invention belongs to the field of environmental engineering, and particularly relates to a biological denitrification process and device for wastewater with high ammonia nitrogen and low carbon to nitrogen ratio. Background technique [0002] The anaerobic digestion of surplus sludge in urban sewage treatment plants is an effective measure for the stabilization of urban surplus sludge. This technology has the advantages of energy recovery, waste reduction and harmlessness. In the anaerobic digestion process, anaerobic bacteria decompose the organic matter in the sludge to generate methane gas, which is recovered as energy. At the same time, the deamination of microorganisms will release nitrogen (mainly ammonia nitrogen and a small amount of organic nitrogen). After dehydration, most of the nitrogen will remain in the sludge digestion solution, so the nitrogen content in the digestion solution is very high (500-2000mg / L). The sludge digestion liquid p...

AI Technical Summary

Problems solved by technology

Anammox bacteria are easily affected by the environment and the sludge doubling time is long, which largely limits the wide application of this technology.

Especially when dealing with actual wastewater, complex water quality and fluctuations in water volume will affect the start-up speed and bacterial activity of the anammox reactor

Therefore, the current nitrification and anammox technologies face application challenges

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