Carbon-source-free deep biological denitrification device

Abstract

The invention provides a carbon-source-free deep biological denitrification device. The device comprises a water collecting tank for transferring sewage to be treated, a water outlet pump communicatedwith the water collecting tank and a cylindrical tower body communicated with the water outlet pipe of the water outlet pump, the height-diameter ratio of the tower body is 10:1, the tower body sequentially comprises a water distribution area, a filler layer, a filter layer, a supporting layer and a lower hollow chamber from top to bottom, the filler layer is composed of a granular filler with the particle size of 3-5 mm, the porosity of the filler layer is 30%, and the height of the filler layer is 80-120 cm; the thickness of the filter layer is 60-80 cm; the supporting layer is composed ofpebbles with the diameter of 4 cm, and the height of the supporting layer is 8 cm; and the water distribution area is provided with a water inlet connected with a water pump, the lower cavity is provided with a water outlet, and the top of the tower body is provided with an exhaust hole for exhausting nitrogen generated in the reaction process. The device has a good treatment effect, and is suitable for high-concentration non-degradable sewage treatment and deep sewage treatment.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a carbon source-free deep biological denitrification device. Background technique [0002] The removal mechanism of nitrogen and phosphorus by biological methods is relatively complicated. Nitrogen removal needs to involve the processes of ammonification, nitrification and denitrification, while phosphorus removal involves multiple biochemical reaction processes such as phosphorus absorption and phosphorus release. The composition of microorganisms, substrate types and requirements for environmental conditions required by each process are also different. Therefore, to complete the denitrification and phosphorus removal processes in one system at the same time inevitably produces contradictory relationships among the processes, such as substrate competition, reflux nitrate, nitrification and denitrification capacity, phosphorus release and phosphorus absorption capacity, ...

AI Technical Summary

Problems solved by technology

Sewage plants often use external carbon sources to strengthen nitrogen removal, including methanol and sodium acetate. These carbon sources have good treatment effects, but generally have the disadvantages of high cost, difficult control of input, and easy to cause secondary pollution. Future research The direction is to seek materials that can replace this type of carbon source

Current research focuses on slow-release carbon sources based on cellulose and biodegradable polymers, and non-organic carbon electron donor materials based on sulfur, hydrogen, and methane. Long-term disadvantages, the latter has attracted attention due to its advantages such as good treatment effect and high economic feasibility

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