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Devices for removing inorganic particles in sewage treatment system

A technology of sewage treatment system and inorganic particles, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc. Type filter press filter cloth wear and other problems

Active Publication Date: 2014-12-24
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under the premise of ensuring that the activated sludge and sewage are fully mixed, the increase in the density and concentration of activated sludge obviously puts forward higher requirements for mechanical agitation or aeration, resulting in increased energy consumption and operating costs.
At the same time, the sludge with excessive sand content will reduce the cake formation rate of sludge during dehydration, and cause excessive wear and tear on the filter cloth of the belt filter press, shortening the service life; When the mud is used, the pump casing is easier to wear through (generally 3-4 years), and the wear-through time of the elbow end of the steel pipe is also shortened from about 10 years under normal conditions to 5-6 years; in the sludge digester, Dealing with the excess sludge with excessive sand content not only makes it difficult to stir the sludge, but also significantly affects the gas production of the digester

Method used

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  • Devices for removing inorganic particles in sewage treatment system
  • Devices for removing inorganic particles in sewage treatment system
  • Devices for removing inorganic particles in sewage treatment system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] Embodiment 1 Assembly of the device of the present invention

[0067] Such as figure 1 with figure 2 As shown, the grit chamber pretreatment system includes a high-efficiency grit chamber 1, a concentration integrated sand-water separator 2, and a fine sand screening and purifying machine 3.

[0068] The outlet water of the fine grid enters the high-efficiency grit chamber 1 through the water inlet pipe 9, the high-efficiency grit chamber removes inorganic particles in the sewage, and the sand-water mixture of the high-efficiency grit chamber enters the concentrated integrated sand-water separation through the sand-water mixture pipe 11 device 2, the high-efficiency grit chamber effluent flows through the high-efficiency grit chamber outlet pipe 10 to the biochemical pool 5. The high-efficiency grit chamber is based on the Bickers grit chamber. By simplifying the function of the grit chamber and optimizing the structure of the grit chamber, the ability to remove fin...

Embodiment 2

[0075] Embodiment 2 The use of device of the present invention

[0076] With a processing scale of 50,000 m 3 / d sewage plant as an example, its influent SS (suspended solids) and ISS (inorganic suspended solids) concentrations are 320mg / L and 200mg / L respectively, and the median diameter of SS is D50 = 105μm; two high-efficiency grit chambers are set , one set of concentrated integrated sand-water separator and one set of fine sand screening and purifying machine; the hydraulic retention time (HRT) of the biochemical tank is 12h, the concentration of organic matter in activated sludge (MLVSS) is controlled at 2100mg / L, and the sludge age (SRT) For 15 days, the sludge return ratio is 60%, and the MLSS of the return sludge in the secondary settling tank is 2.67 times that of the sludge in the biochemical tank.

[0077] The flow rate of the sand-water mixture produced by the grit chamber is 400m 3 / d, the dry weight of SS is 12.03t / d, and the dry weight of ISS is 7.52t / d. The ...

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Abstract

The invention belongs to the technical field of sewage treatment, particularly relates to devices for removing inorganic particles in a sewage treatment system, aims to provide a new selection for solving the technical problem in removing the inorganic particles in the sewage treatment system, and provides the two devices for removing the inorganic particles in the sewage treatment system. Each device respectively comprises a grit basin pre-treatment system and a sludge inorganic particle separating system which are connected through a pipeline. The invention further provides a method for sewage treatment by adopting the devices. The devices disclosed by the invention can be used for efficiently removing the inorganic particles in the sewage treatment system.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, in particular to a device for removing inorganic particles in a sewage treatment system. Background technique [0002] At present, my country's drainage system is mainly an interception-type confluence system or a system in which a confluence system and a diversion system coexist. The amount of inorganic particles carried by the sewage in the pipe network is large and the particle size distribution is wide, which has become an issue that affects the collection, treatment and sludge treatment of my country's sewage. important factor. [0003] The actual observation and operation practice in the past 10 years shows that many urban sewage treatment plants in my country will have obvious sedimentation at the front of the biochemical tank or in the entire biological treatment system after several years of operation (some 1 to 2 years). And then affect the function of the biological treatment s...

Claims

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Application Information

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IPC IPC(8): C02F9/14
Inventor 吉芳英何强王颖颜达超周峰甘虎许晓毅徐璇
Owner CHONGQING UNIV
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