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Preparation method and application of magnetic flocculant

A magnetic flocculant and magnetic technology, applied in chemical instruments and methods, flocculation/sedimentation water/sewage treatment, magnetic field/electric field water/sewage treatment, etc. Inconvenient operation and other problems to achieve the effect of avoiding hazards, eliminating secondary pollution, and low cost

Inactive Publication Date: 2018-08-21
安徽雷克环境科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the biological method uses ecological principles to minimize the impact on the environment, this method has limitations in the effective prevention and control of cyanobacteria blooms in small-scale, fixed areas. Once the water body area is large, cyanobacteria blooms will easily follow the wind direction. and the erratic changes in water flow will have little effect; and biological methods often need to invest in huge man-made projects in advance to create and control the living conditions of microorganisms, aquatic plants or animals required to inhibit cyanobacteria blooms, so the results are slow and costly. High, it is difficult to be generally applicable to the treatment of large waters and sudden algal blooms
[0007] In summary, although the above three methods can alleviate or even temporarily remove cyanobacteria blooms under certain conditions, they still have problems such as high cost, inconvenient operation, or secondary pollution. The large-scale promotion and application of measures and measures

Method used

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  • Preparation method and application of magnetic flocculant
  • Preparation method and application of magnetic flocculant
  • Preparation method and application of magnetic flocculant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] First mix the attapulgite powder with a particle size of 200 mesh and the magnetic iron ore powder with a particle size of 800 mesh at a mass ratio of 2:1, and then soak the mixed powder in a concentration of 9.7mol / in L concentrated hydrochloric acid solution for 20 hours, and finally dried naturally and crushed into powder to obtain magnetic flocculant.

[0023] During the salvage process of cyanobacteria in Chaohu Lake from 2016 to 2017, the magnetic flocculant prepared above was added in an amount of 300mg / L to a concentration of 1×10 6 In the cell / L algal bloom water body, stir rapidly, and when a large number of floc alum flowers appear, the cyanobacteria flocs are removed by an external magnetic field strength of 3500GS floc magnetic separator. The effluent effect has improved significantly, and the third-party testing shows that the removal rates of algae density, chlorophyll a, total phosphorus, COD, and SS have reached 99.94%, 99.98%, 97.5%, 83.33%, and 91.27...

Embodiment 2

[0027] First mix the attapulgite powder with a particle size of 300 mesh and the magnetic iron ore powder with a particle size of 1000 mesh at a mass ratio of 2:0.5, and then soak the mixed powder in a concentration of 10mol / L at a mass ratio of 2:1 In concentrated hydrochloric acid solution for 24 hours, and finally dried naturally and crushed into powder to obtain magnetic flocculant.

[0028] During the salvage process of blue-green algae in Chaohu Lake from 2016 to 2017, the magnetic flocculant prepared above was added in an amount of 400mg / L to a concentration of 1×10 9 In the algal bloom water body of cell / L, stir rapidly, and when a large number of floc alum flowers appear, the cyanobacteria flocs are removed by an external magnetic field strength of 4000GS floc magnetic separator. The effluent effect has improved significantly, and the third-party testing shows that the removal rates of algae density, chlorophyll a, total phosphorus, COD, and SS have reached 99.90%, 96...

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Abstract

The invention discloses a preparation method and an application of a magnetic flocculant. Attapulgite powder and magnetic iron mineral powder are mixed uniformly in the mass ratio being 2:0.5-1, the mixed powder is soaked in a concentrated hydrochloric acid solution for 20-24 h, the solution is dried naturally and ground into powder, and the magnetic flocculant is obtained. The magnetic flocculantcan effectively adsorb and flocculate algal cells in algae-laden water, so that algal floc is moved from a water body easily by an externally added magnetic field, the rates of removal of bloomed cyanobacteria cells and chlorophyll a are 95% or higher, the effect of removal of nitrogen, phosphorus, COD and SS from the water body is remarkable, harm caused by aggregation of cyanobacterial bloom can be eliminated rapidly, and bloom breakout frequency can be reduced. Besides, the magnetic flocculant has low cost, higher application value and higher market potential.

Description

technical field [0001] The invention relates to the field of environmental protection materials, in particular to a preparation method and application of a magnetic flocculant. technical background [0002] Lakes are an important part of human social and economic development. They not only have abundant water, hydraulic and aquatic resources, but also have the function of regulating and storing floods and waterlogging during flood seasons. However, due to the rapid development and construction of society, its speed far exceeds the treatment capacity of social production and domestic sewage discharge standards, leading to the major environmental problem of water eutrophication in countries all over the world. [0003] A prominent problem brought about by eutrophication of water bodies is the frequent outbreaks of cyanobacteria blooms. Large-scale frequent outbreaks of cyanobacteria blooms reduce the utilization efficiency of water resources, cause serious ecological damage an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52C02F1/48
CPCC02F1/488C02F1/5236
Inventor 周澳吴敬东孙进杜海明许坤鹏
Owner 安徽雷克环境科技有限公司
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