Composite denitrification biological tank

Abstract

The invention discloses a composite denitrification biological tank which comprises a biological tank body, and the biological tank body is composed of a water distribution system, a gas backwashing system, a biological filler, a filler support, a backwashing wastewater drainage channel, a backwashing wastewater drainage pipe and a carbon source accurate adding control system. The water distribution system comprises a water inlet pipe, water distribution pipes, a water outlet pipe and a water outlet channel, the water inlet pipe communicated with the biological tank body is installed on one end face of the bottom of the biological tank body, the water distribution pipes are evenly arranged on the water inlet pipe located in the biological tank body at equal intervals, and a water outlet channel is arranged on the upper portion of the biological tank body. The water outlet pipe is mounted at the side end of the upper part of the biological tank body, is distributed away from one side of the water inlet pipe and can realize fluid communication with the water outlet channel; and the air backwashing system comprises a backwashing air pipe and an air inlet control valve, and the backwashing air pipe is mounted on one side, deviating from the water inlet pipe, of the biological tank body. Thecomposite denitrification biological tank has the advantages of high efficiency, stability, simplicity in management, low cost and low energy consumption.

Description

technical field [0001] The invention relates to the technical field of advanced sewage treatment, in particular to a compound denitrification biological pool. Background technique [0002] In recent years, due to the rapid development of my country's society, the improvement of economic level and the acceleration of urbanization, various places have issued local discharge standards for urban sewage treatment plants. With the improvement of discharge standards and the strengthening of environmental law enforcement, especially Excessively high requirements for total nitrogen and total phosphorus will lead to eutrophication of the water body, and the sewage treatment plant will face increased pressure to meet the discharge standards. In 2019, the state issued the "Three-Year Action Plan for Urban Sewage Quality Improvement and Efficiency Improvement", which proposed to take the improvement of quality and efficiency of sewage treatment as a major issue related to people's livelih...

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Problems solved by technology

In the original sewage treatment plant, due to various reasons such as system design, treatment process, management measures, collection system, and fluctuations in influent water quality, some indicators of the sewage treatment plant could not meet the standards stably, especially the ammonia nitrogen and total nitrogen indicators, which have almost become my country's national standard. Common problems in sewage treatment plants

[0003] The current national discharge standards for ammonia nitrogen and total nitrogen in most sewage treatment plants are 5 (8) mg / L and 15 mg / L respectively, and local discharge standards are raised to 1.5 mg / L and 10 mg / L respectively. The nitrogen requirement is increased to less than 5mg / L, so to ensure that the total nitrogen reaches the standard, it is usually necessary to take measures such as strengthening measures and adding treatment structures, such as adding biological aerated filters, denitrification filters and adding carbon sources in the advanced treatment section. Typical treatment processes include deep bed denitrification filter, biological aerated filter denitrification filter and continuous sand bed denitrification filter, etc., but limited by filter structure, packing type and other factors, there is still a large head loss , complex operation and management, high energy consumption and low treatment efficiency, it is difficult to meet the requirements of the latest discharge standards. Low cost is the problem to be solved

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