Device and method for treatment of low-temperature and low-carbon ammonia nitrogen wastewater on basis of solid-phase denitrification and heterotrophic nitrification-aerobic denitrification

Abstract

The invention provides a device and a method for treatment of low-temperature and low-carbon ammonia nitrogen wastewater on the basis of solid-phase denitrification and heterotrophic nitrification-aerobic denitrification. The device comprises a reactor and a reflux system, wherein the upper part and lower part of the reactor are respectively provided with a fluidized bed aerobic zone and a filterpool anoxic zone which are filled with a solid carbon source filling material and separated by a porous water distribution plate; an aeration tube is arranged on the water distribution plate and connected with an aeration device through a gas flowmeter; the lower end of the reactor is provided with a water inlet; the upper end of the reactor is provided with a water outlet; an effluent of the reactor enters a secondary sedimentation tank, and an effluent of the secondary sedimentation tank enters an intermediate water storage tank through an overflowing opening; the upstream end of the refluxsystem communicates with an effluent of the intermediate water storage tank; the downstream end of the reflux system communicates with the reflux opening of the lower end of the reactor through a liquid flowmeter; and the interior of the fluidized bed aerobic zone is provided with a dissolved oxygen monitor and a nitrate concentration monitor. The device and the method provided by the invention can still realize highly-efficient removal of ammonia nitrogen and total nitrogen under the conditions of low temperature and low carbon.

Description

technical field [0001] The present invention relates to the technical field of water treatment, in particular to a low-temperature low-carbon ammonia-nitrogen wastewater treatment device and method based on solid-state reverse nitrification and heterotrophic nitrification-aerobic denitrification, which realizes solid-state reverse nitrification and heterotrophic nitrification- Aerobic denitrification synergy is mainly aimed at the denitrification treatment of low-temperature and low-carbon ammonia nitrogen wastewater. Background technique [0002] The "China Environmental Quality Bulletin" issued by the Ministry of Environmental Protection of my country shows that the pollution of my country's water environment is intensifying, and nitrogen (nitrite nitrogen, nitrate nitrogen and ammonia nitrogen) is the main pollution indicator. As the pollution of the water environment continues to intensify and the environmental capacity continues to decrease, improving the discharge stan...

AI Technical Summary

Problems solved by technology

Under low temperature conditions, the specific growth rate of nitrifying bacteria is two orders of magnitude smaller than that under normal temperature conditions, and the growth and reproduction rate of nitrifying bacteria is slower, resulting in more serious loss of nitrifying bacteria in the aerobic tank, low biomass of nitrifying microorganisms, and low nitrification effect. The deterioration is serious, and ammonia nitrogen emissions cannot meet the standards

The second is the issue of low-carbon sources

However, during the practical application of the HN-AD technique, some limiting factors were found

For example, the number of functional bacteria with high HN-AD performance is small, and HN-AD bacteria have a certain demand for dissolved oxygen and carbon sources. When HN-AD functional bacteria are directly put into the aerobic pool, due to their weak competitiveness, Unable to form dominant bacterial flora, and the removal rate of total nitrogen is not high under the condition of low carbon source

Due to the existence of these limiting factors, the efficiency and stability of the water treatment system based on HA-AD technology are reduced

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