A sewage treatment device and sewage treatment method capable of controlling product crystal particle size

A sewage treatment device and crystal particle size technology, which is applied in water/sewage treatment, water/sewage treatment equipment, water/sludge/sewage treatment, etc., can solve the problems of inability to simultaneously realize efficient interception and granulation of crystals, and achieve maintenance The effect of small operation difficulty, simple device structure and low transformation cost

Active Publication Date: 2022-07-08
INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to overcome the inability to simultaneously realize efficient interception and granulation of crystals in the existing fluidized bed crystallization technology

Method used

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  • A sewage treatment device and sewage treatment method capable of controlling product crystal particle size
  • A sewage treatment device and sewage treatment method capable of controlling product crystal particle size
  • A sewage treatment device and sewage treatment method capable of controlling product crystal particle size

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] This embodiment provides a sewage treatment device that can control the crystal particle size of the product, such as figure 1 As shown, the sewage treatment device includes a fluidized bed body, a reflux device and a dosing device. The fluidized bed body is sequentially provided with a sedimentation zone 3, a transition zone 2 and a fluidization zone 1 from top to bottom, and the reflux device passes through the reflux pipe 5. Connected to the main body of the fluidized bed, the return pipe 5 extends from the precipitation zone 3 into the main body of the fluidized bed, and can control the particle size of the crystallized product by changing the height of the return port 6 at the bottom of the return pipe in the main body of the fluidized bed.

[0042] Through the improvement of the reflux device, the present invention makes full use of the crystal growth law and fluid flow characteristics in the main body of the fluidized bed, and creatively proposes a highly variable r...

Embodiment 2

[0056] This embodiment provides a sewage treatment device that can control the crystal particle size of the product, such as figure 2 As shown in the figure, the pipe diameter ratio of the precipitation zone and the fluidized zone is 5:1, and the height ratio of the precipitation zone, the transition zone and the fluidized zone is 1:2:4. Specifically, the designed fluidized bed processing load is 50m 3 / d, the fluidization zone has a diameter of 0.6m and a height of 4.0m, the transition zone has a height of 2.0m, and the sedimentation zone has a diameter of 3m and a height of 1.0m.

[0057] The return pump is an impeller centrifugal pump. The retractable return pipe 5 can adjust the position of the return port in the main body of the fluidized bed. The position of the return port varies from 1 / 20-1 / 5 below the overflow liquid level at the top of the sedimentation zone to the middle of the transition zone.

[0058] The return port 6 is in the shape of a bell mouth, the angle ...

Embodiment 3

[0062] This embodiment provides a sewage treatment method, using the sewage treatment device of Embodiment 1, and the method includes the following steps:

[0063] (1) By adjusting the insertion depth of the return pipe in the main body of the fluidized bed, the return port is placed in the middle of the transition zone, and by adjusting the insertion depth of the first path of the dosing pipe in the main body of the fluidized bed Insertion depth, the top injection port is placed in the precipitation zone;

[0064] (2) input the production waste water of treating wood activated carbon from the feed port to the main body of the fluidized bed, the phosphate concentration in the waste water is 1500mg / L, start the reflux pump and the dosing pump, and do the dosing through the bottom dosing port, Preparation of microcrystals, operating parameters: pH is 8.5, the upward flow rate in the fluidization zone is 0.02m / s, and the flow rate in the sedimentation zone is 0.002m / s; nitrogen s...

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Abstract

The invention relates to a sewage treatment device and a sewage treatment method capable of controlling the crystal particle size of a product. The sewage treatment device is characterized in that the sewage treatment device comprises a fluidized bed main body, a return device and a dosing device, and the fluidized bed main body is from top to bottom. A precipitation zone, a transition zone and a fluidization zone are arranged in sequence, and the reflux device is connected to the main body of the fluidized bed through a reflux pipe, and the reflux pipe extends into the main body of the fluidized bed from the precipitation zone, and can be changed by changing the reflux pipe. The height of the bottom reflux port in the body of the fluidized bed controls the particle size of the crystalline product. By controlling the position of the return port of the return pipe in the main body of the fluidized bed, and adjusting the insertion depth of the return pipe according to the product particle size requirement, the particle size of the final product can be flexibly controlled, and the product recovery rate can be improved at the same time.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment and resource utilization, and particularly relates to a sewage treatment device and a sewage treatment method capable of controlling the crystal particle size of a product. Background technique [0002] Fluidized bed crystallization is a common technology for wastewater treatment and recycling. Compared with traditional stirred reactors, fluidized bed can realize continuous treatment of wastewater and intermittent discharge of crystalline products, with good pollutant removal effect and strong impact resistance. , the obtained product has low moisture content, large particle size and low impurity content. At the same time, the system is easy to automate and control, and has received extensive attention in the fields of pollutant removal and recovery (such as phosphorus recovery, fluorine removal), drinking water softening (calcium removal), etc. [0003] However, the existing fluidized b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/52C02F101/10
CPCC02F1/5281C02F2201/002C02F2001/5218C02F2101/10Y02W10/10C02F2001/007C02F2201/005C02F1/5245C02F2101/14C02F2103/20C02F2103/005
Inventor 叶欣陈少华陈民权
Owner INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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