Device and method for denitrifying sludge anaerobic digestion liquid

Abstract

The invention discloses a device and a method for denitrifying sludge anaerobic digestion liquid. The device comprises a reaction tank, the interior of the reaction tank is divided into a first reaction area and a second reaction area through a partition plate, the bottoms of the first reaction area and the second reaction area are communicated, a filler cage is arranged on the liquid level of thefirst reaction area, a water distribution branch pipe is arranged above the filler cage, aeration branch pipes are arranged at the bottoms of the first reaction area and the second reaction area, andthe aeration branch pipes are communicated with air blowers. According to the method, the device is adopted to treat the sludge anaerobic digestion liquid. According to the device disclosed by the invention, the reaction tank is divided into two reaction areas, so that two-stage short-cut nitrification/denitrification series connection can be realized, the effect of synchronous nitrification anddenitrification is realized, and the problems of easiness in blockage, easiness in pollution and the like can be avoided. According to the method, the characteristics of low C/N ratio and low COD degradation rate of the sludge anaerobic digestion liquid and the design of a filler cage are utilized, and a back-end continuous flow intermittent aeration mode is combined to realize two-stage short-cutnitrification and denitrification, so that the effects of two-stage cooperation and high-efficiency treatment are achieved.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and relates to a device and method for denitrification of anaerobic digestion liquid of sludge. Background technique [0002] Sludge anaerobic digestion solution is the sludge press filtrate produced after anaerobic digestion and dehydration of sludge. Due to the addition of conditioning agents such as acidic iron salts, PAM, etc. during the dehydration process of digested sludge, the sludge produced after anaerobic digestion Sludge press liquid has the characteristics of high ammonia nitrogen concentration (2000-3500mg / L), extremely low C / N ratio (close to 1), low alkalinity, etc. At the same time, the conversion of soluble COD in the anaerobic digestion process and the PAM flocculation in the dehydration process , the residual COD in the press filtrate has the characteristics of poor biodegradability and low degradation rate. It can be seen that based on the characteristics of...

AI Technical Summary

Problems solved by technology

However, the existing synchronous short-cut nitrification and denitrification technology has the following defects: low operating load, difficult control of nitrification and denitrification conditions, and low overall treatment efficiency

In addition, the following problems still exist in the existing synchronous short-range nitrification and denitrification device: (1) In the nitrification and denitrification device that isolates the reactor from different dissolved oxygen environments through the separation membrane, the volume utilization rate is low, and it is difficult to achieve an effective level The water quality is mixed with each other, and there are also problems such as easy clogging, easy pollution, and high cost of the separation membrane; (2) in the existing nitrification and denitrification device that separates the reactor from different reaction areas in space through a partition, there are nitrification and denitrification It cannot be controlled separately, the overall treatment efficiency is low, and because the transition zone is set between different reaction zones, it will not only reduce the pollutant operating load in the device, but also make the pool occupy a larger area. Biological fillers also have problems such as easy clogging, easy pollution, and high cost of biological fillers

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