Up-flow precipitation hydrolysis and two-stage ao biochemical treatment system and its application

Abstract

The invention provides an upward flowing type deposition-hydrolyzing and two-stage AO biochemical treatment system. The system comprises an upward flowing type deposition-hydrolyzing pond, an anoxic grid, an aerobic grid and a transition grid, wherein the upward flowing type deposition-hydrolyzing pond is connected with the aerobic grid through a water discharging pipe; a flow guide barrel is arranged in the center of the upward flowing type deposition-hydrolyzing pond; a water feeding pipe of which an opening is upwards formed is inserted into the flow guide barrel; a reflecting plate is connected to the lower end of the flow guide barrel; a vertical agitator is arranged in the center of the upward flowing type deposition-hydrolyzing pond; a rotating shaft of the vertical agitator passes through the flow guide barrel and the reflecting plate; agitating blades of the vertical agitator are positioned below the reflecting plate; an inclined slope inclined toward the center of the tank is arranged at the bottom part of the upward flowing type deposition-hydrolyzing pond to form a mud bucket; a sand washing machine is connected to the bottom part of the mud bucket through a mud absorbing pipe and is connected with the water feeding pipe through a fermenting liquid reflowing pipe and a pump. According to the system, the mud bucket formed in the upward flowing type deposition-hydrolyzing pond is deep, and a mud storing layer is thick, so that high-concentration mud at the bottom of the pond can be fermented and hydrolyzed to generate a large number of VFA (Volatile Fatty Acid) so as to improve the anaerobic phosphate release effect.

Description

technical field [0001] The invention relates to a two-stage AO process for strengthening precipitation hydrolysis, which belongs to the technical field of sewage treatment. Background technique [0002] At present, the national discharge standards for sewage plants are becoming increasingly stringent, and the requirements for nitrogen and phosphorus removal have been put forward. However, since denitrifying bacteria and phosphorus accumulating bacteria both have demand for carbon sources, it is difficult to efficiently achieve nitrogen and phosphorus removal for low-carbon source sewage. Phosphorus removal. Moreover, most of the BOD and COD in the carbon source of the sewage itself are insoluble or non-degradable organic matter, which are not easily used by phosphorus accumulating bacteria and denitrifying bacteria. In order to improve the availability of carbon sources in sewage plants, many sewage plants have increased The hydrolysis pool can convert macromolecular organi...

AI Technical Summary

Problems solved by technology

[0006] While the traditional AAO process (such as figure 1 ), set an anaerobic zone and anoxic zone, and return the external return sludge to the anaerobic zone. Since the return sludge carries a lot of nitrate, it cannot release anaerobic phosphorus well, which affects the phosphorus removal effect.

Moreover, the volume of the anoxic zone is often insufficient, resulting in incomplete anoxic denitrification reaction, and the final denitrification and phosphorus removal effect is not good.

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