Compound functional primary settling tank, system containing compound functional primary settling tank and application of system

Abstract

The invention relates to a compound functional primary settling tank. The compound functional primary settling tank is circular, the slope of the bottom of the compound functional primary settling tank is 0.01-0.02, the center of the bottom of the compound is connected with a water inlet pipe, a submersible water impeller is arranged at the bottom of the compound functional primary settling tank; a reflowing sludge pipe is arranged on the wall of the compound functional primary settling tank. According to the compound functional primary settling tank, through reconstructing a structure of the compound functional primary settling tank and regulating a treatment process, the primary settling tank can run according to manners of common settling, hydrolytic acidification, anaerobic phosphorus release and anoxic denitrification to adapt to changes of water temperatures and water quality, so that the treating effect of organic matter and nitrogen and phosphorus is improved. According to a system provided by the invention, the integral tank volume of a sewage plant can be reduced, and the operating energy consumption is reduced. Aerobic and anaerobic sections of a biological tank can be fully mixed so that SS concentrations of a mud-water mixture are basically consistent in all points in the tank. The compound functional primary settling tank is built by adopting a tank volume varying manner, the total biological treatment operating tank volume is determined according to the water quality condition and the operation need, so that the compound functional primary settling tank runs at a minimum tank volume; when no biological treatment is required, the compound functional primary settling tank runs according to a primary settling or hydrolysis manner with relatively low energy consumption, so that the electricity consumption is reduced.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and relates to a device for removing particles in sewage by a sedimentation method and an application thereof. Background technique [0002] The primary settling tank is a routine treatment process of urban sewage treatment plants. It is installed after the pretreatment process such as grille and sand settling. The main purpose is to remove large particles of pollutants in the water. The primary settling tank has a certain conditioning effect on water quality, which can alleviate the impact of water quality changes. [0003] The primary sedimentation tank can adopt various forms such as advection, vertical flow, and amplitude flow. The sedimentation time is 0.5-2.0 hours, and the surface hydraulic load is 1.5-4.5m 3 / m 2 h. At the same time, it is necessary to set up mud discharge and skimming facilities. [0004] In recent years, there have been many controversies in the design and a...

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Problems solved by technology

[0007] (3) In a sewage plant without a primary sedimentation tank, there are also problems such as excessive inorganic matter entering the biological tank, low organic components in the sludge, and poor treatment efficiency of the biological tank.

[0008] It can be seen that if there is only sedimentation function, there are certain problems whether the primary sedimentation tank is set up or not, which will affect the subsequent treatment process.

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