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Sewage treatment device capable of controlling product crystallization granularity and sewage treatment method

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, low transformation cost and simple device structure

Active Publication Date: 2021-01-26
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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  • Sewage treatment device capable of controlling product crystallization granularity and sewage treatment method
  • Sewage treatment device capable of controlling product crystallization granularity and sewage treatment method
  • Sewage treatment device capable of controlling product crystallization granularity and sewage treatment method

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Experimental program
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Effect test

Embodiment 1

[0041] The present embodiment provides a sewage treatment device capable of controlling the crystallization size of the product, such as figure 1 As shown, the sewage treatment device includes a fluidized bed main body, a reflux device and a dosing device. The fluidized bed main 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 with the main body of the fluidized bed, the reflux 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 reflux port 6 at the bottom end of the reflux pipe in the main body of the fluidized bed.

[0042] By improving 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 heig...

Embodiment 2

[0056] The present embodiment provides a sewage treatment device capable of controlling the crystallization size of the product, such as figure 2 As shown, the diameter ratio of the sedimentation zone to the fluidization zone is 5:1, and the height ratio of the sedimentation zone, transition zone, and fluidization zone is 1:2:4. Specifically, the design fluidized bed treatment load is 50m 3 / d, the diameter of the fluidized zone is 0.6m, the height is 4.0m, the height of the transition zone is 2.0m, the diameter of the sedimentation zone is 3m, and the height is 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, and 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 between th...

Embodiment 3

[0062] This embodiment provides a kind of sewage treatment method, uses the sewage treatment device of embodiment 1, and described method comprises the following steps:

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

[0064] (2) Input the production wastewater for processing woody activated carbon from the feed inlet to the fluidized bed main body, the phosphate concentration in the wastewater is 1500mg / L, start the reflux pump and the dosing pump, and dosing by the bottom dosing port, Preparation of microcrystals, operating parameters: pH 8.5, rising flow rate in the fluidization zone 0.02m / s, flow rate in the sedimentation zone 0.002m / s; nitrogen source and magnesium source are added through the bottom inj...

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Abstract

The invention relates to a sewage treatment device capable of controlling product crystallization granularity and a sewage treatment method, and is characterized in that the sewage treatment device comprises a fluidized bed main body, a reflux device and a dosing device, and the fluidized bed main body is sequentially provided with a settling zone, a transition zone and a fluidization zone from top to bottom; the reflux device is connected with the fluidized bed main body through a reflux pipe, the reflux pipe extends into the fluidized bed main body from the settling zone, and the granularityof a crystallized product can be controlled by changing the height of a reflux port at the bottom end of the reflux pipe in the fluidized bed main body. By controlling the position of the return pipeat the return port in the fluidized bed main body and adjusting the insertion depth of the return pipe in combination with the product granularity requirement, the final product granularity can be flexibly adjusted and controlled, and meanwhile, the product recovery rate is improved.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment and recycling, and in particular relates to a sewage treatment device and a sewage treatment method capable of controlling the crystal 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 crystallized products. It has good pollutant removal effect and strong impact resistance. , the resulting product has low moisture content, large particle size, and less impurity content. At the same time, the system is easy to automate and control, and has attracted extensive attention in the fields of pollutant removal and recovery (such as phosphorus recovery, fluorine removal), drinking water softening (calcium removal) and other fields. [0003] However, the existing fluidized b...

Claims

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Application Information

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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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