Device and method of residual sludge alkaline fermentation and inner carbon source development technology coupled with A-A-O nitrogen and phosphorous removal system

Abstract

The invention discloses a device and a method of a residual sludge alkaline fermentation and inner carbon source development technology coupled with an A-A-O nitrogen and phosphorous removal system, and belongs to the field of environmental protection. Residual sludge is inoculated to an anaerobic fermentation integrated device, an alkali solution is pumped into the anaerobic fermentation integrated device, a blender is started, and the alkali solution is discontinuously fed. A fermented liquid is discharged from the top and goes into an external sedimentation area, at the same time, a certain proportion of nitrification liquid in the A-A-O system is subjected to pre-denitrification denitrogenation in the external sedimentation area of the anaerobic fermentation integrated device, an effluent of the sedimentation area is subjected to N and P recovery in a mid-sedimentation tank, and after the fermentation liquid is subjected to slurry water separation and then goes into the A-A-O system for nitrogen and phosphorous removal treatment; the A-A-O system residual sludge flows back to an internal reaction area of the anaerobic fermentation integrated device. Culture conditions comprise that the temperature is 20-30 DEG C, the pH is 9-10, and the concentration of dissolved oxygen is 0-0.1 mg / L. The problems of low acid production amount of fermentation of activated sludge and insufficient carbon sources in the A-A-O nitrogen and phosphorous removal system are solved. The anaerobic fermentation technology, anaerobic / anoxic / aerobic technology, physical sedimentation technology and chemical sedimentation technology are effectively combined together by the method.

Description

technical field [0001] The invention relates to a device and a method for an internal carbon source coupling A-A-O denitrification and phosphorus removal system developed by alkaline fermentation of residual sludge, and belongs to the technical field of environmental protection. Through the joint action of hydrolytic acidifying bacteria, nitrifying bacteria, denitrifying bacteria, and phosphorus accumulating bacteria, the sludge fermentation liquid is used as a carbon source to supply the A-A-O nitrogen and phosphorus removal system, which makes up for the low efficiency of nitrogen and phosphorus removal caused by the lack of carbon sources in the system. At the same time, the sludge fermentation system achieves the purpose of sludge reduction through the actions of predation, decomposition, and dissolution among microorganisms. Background technique [0002] The A-A-O process is a commonly used process for nitrogen and phosphorus removal and COD removal in sewage treatment ...

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Problems solved by technology

[0005] Aiming at the problems of insufficient carbon source in the A-A-O denitrification and phosphorus removal system, the inability to coexist well with denitrification and phosphorus accumulation, and the difficulty in handling the remaining sludge in the A-A-O process, the present invention proposes a sludge anaerobic digestion that can also be used as a supplementary carbon The source enters the A-A-O system for denitrification and dephosphorization treatment. Part of the nitrification liquid in the A-A-O system is returned to the sedimentation area of ​​the sludge anaerobic digestion unit for pre-anoxic treatment, and the denitrification and denitrification treatment is carried out in the early stage, which not only reduces the impact of dissolved oxygen on The influence of phosphorus-accumulating bacteria on phosphorus release, and at the same time strengthen the denitrification and phosphorus-removing effect of phosphorus-accumulating bacteria in anoxic areas

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