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Sewage disposal plant combining coagulation and air flotation

A sewage treatment device and air flotation combined technology, applied in flotation water/sewage treatment, flocculation/sedimentation water/sewage treatment, water/sewage multi-stage treatment, etc., can solve uneven distribution, affect air flotation efficiency, Large floor space and other problems, to achieve the effect of improving air flotation efficiency, high air flotation efficiency, and small floor space

Inactive Publication Date: 2010-05-19
WENZHOU UNIVERSITY
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  • Claims
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AI Technical Summary

Problems solved by technology

[0005] There are three problems in this traditional pressurized dissolved air flotation method: first, coagulation tank and air flotation tank are required at the same time, which occupies a large area; second, about 10% of the return water is used as dissolved air water, such as figure 1 As shown, the air-dissolving device needs a pressure of 5-6kg, the dissolved air pressure is high, and the energy consumption is high; thirdly, the pressure of the dissolved air water is reduced from 5-6kg to normal pressure, and the pressure difference at the outlet of the dissolved air is large, and the gas is released quickly and easily. The formation of large bubbles affects the air flotation efficiency
Fourth, it is necessary to return part of the purified water after air flotation treatment to the dissolved air tank to generate dissolved air water, such as figure 1 As shown, the dissolved air water entering the air flotation tank from the dissolved air tank and the sewage entering the air flotation tank through the coagulation tank tend to mix unevenly, resulting in different sizes and uneven distribution of microbubbles, which makes the flocculation formed in the local area of ​​sewage The network structure of the body has a large mesh, and it is difficult to remove suspended solids with small particle size

Method used

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  • Sewage disposal plant combining coagulation and air flotation
  • Sewage disposal plant combining coagulation and air flotation
  • Sewage disposal plant combining coagulation and air flotation

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Embodiment Construction

[0020] The present invention is specifically described below by the embodiment, only for further illustrating the present invention, can not be interpreted as the limitation of protection scope of the present invention, the technical engineer of this field can make some non-essential improvements and improvements to the present invention according to the content of the above-mentioned invention Adjustment.

[0021] Such as figure 2 The specific embodiment of the present invention shown includes a pipeline mixer 1, an air-dissolving device 2, and a sedimentation tank 4. The pipeline mixer 1 is equipped with a stirring device and has a sewage inlet and a coagulant inlet respectively. The pipeline, said dissolving device 2 is connected to the outlet end of pipeline mixer 1, the outlet end of this dissolving device 2 is connected with coagulation air flotation device 3, and the outlet end of described coagulation air flotation device 3 is connected to Settling tank 4, the coagul...

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Abstract

The invention discloses a sewage disposal plant combining coagulation and air flotation, comprising a pipeline mixer, a gas dissolving device, an extending section remaining coagulation zone and a decreased section air flotation area; sewage passes through the device to directly enter a desilter so as to realize solid-liquid separation. The invention has the characteristics of simple equipment, small floor area, low energy consumption, easy control, high air flotation efficiency and the like and is especially suitable for processing sewage with smaller flow.

Description

technical field [0001] The invention relates to a sewage treatment device, in particular to a sewage treatment device integrating coagulation and air flotation. Background technique [0002] The air flotation method is one of the new international water treatment methods at present. It can be used in sewage treatment occasions where the sedimentation method is not applicable to separate suspended solids with a specific gravity close to water and difficult to settle, such as oil, fiber, algae, etc. It can also be used To concentrate activated sludge. Its working principle is to dissolve a large amount of air in water under pressure to form dissolved air water. As a working medium, the dissolved air releaser is suddenly decompressed and released quickly to generate a large number of microbubbles. The micro-bubbles adhere to the condensate in the coagulation reaction sewage, so that the specific gravity of the floc is lower than that of water and floats on the water surface, s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F1/52C02F1/24
Inventor 周建飞兰云军许晓红黄小游金强伟刘建国
Owner WENZHOU UNIVERSITY
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