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Industrial heavy metal sewage treatment method based on flocculation, flotation and sedimentation

A sewage treatment method and heavy metal technology, applied in the direction of flotation water/sewage treatment, sedimentation treatment, water/sewage treatment, etc., can solve the problems of unstable removal effect, secondary pollution treatment cost, etc., and achieve stable and enhanced treatment effect Effect of flocculation, good dispersion performance

Active Publication Date: 2019-04-16
ZHEJIANG UNIV OF FINANCE & ECONOMICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, these methods have more or less disadvantages such as unstable removal effect, easy to produce secondary pollution and high treatment cost. Therefore, how to choose a reasonable, effective and practical method for removing heavy metal ions is a common problem at present.

Method used

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  • Industrial heavy metal sewage treatment method based on flocculation, flotation and sedimentation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Preparation of modified shell powder: Wash the shells and dry them at 60°C, add 0.1mol / L nitric acid solution, and reflux at 75°C for 2 hours. After the reaction, take out the shells and wash them with deionized water until medium After drying, place it in a calciner, heat up to 700°C and calcinate for 4 hours, take it out after cooling to room temperature with the furnace, and pulverize it with a nano pulverizer to obtain modified shell powder.

[0036] Prepare chitosan acetic acid solution: weigh 2g chitosan, add 100mL water, then add 2mL glacial acetic acid, stir evenly, heat to 85°C, add water to 100mL, keep warm for 45min to obtain 1% chitosan acetic acid solution .

[0037] Preparation of modified water hyacinth airbag fiber bundle tube: Take healthy water hyacinth plants with an average diameter of 2.5cm to 4.5cm at the airbag part, cut to obtain the airbag and the plant stem 0.5cm above and below the airbag, and vacuum dry to the moisture content of the plant st...

Embodiment 2

[0047] The preparation of the modified shell powder is the same as in Example 1.

[0048] Preparation chitosan acetic acid solution is identical with embodiment one.

[0049] Preparation of modified water hyacinth airbag fiber bundle tube: Take healthy water hyacinth plants with an average diameter of 2.5cm to 4.5cm at the airbag part, cut to obtain the airbag and the plant stem 0.5cm above and below the airbag, and vacuum dry to the moisture content of the plant stem about 25%, peel off the surface layer, then cut the surface layer obtained by peeling it off, pass through a 30-mesh sieve, then add 0.8% by weight of modified shell powder, mix evenly, and obtain the airbag fiber bundle tube, take the airbag fiber bundle The tube is mixed with the same mass of polyaluminum ferric chloride to obtain a solid mixture, and the solid mixture is heated to 70°C by far infrared, stirred during the heating process, and sprayed with 1% chitosan acetic acid solution at the same time, where...

Embodiment 3

[0054] The preparation of the modified shell powder is the same as in Example 1.

[0055] Preparation chitosan acetic acid solution is identical with embodiment one.

[0056] Preparation of modified water hyacinth airbag fiber bundle tube: Take healthy water hyacinth plants with an average diameter of 2.5cm to 4.5cm at the airbag part, cut the airbag and the plant stem 1cm above and below the airbag, and vacuum dry until the moisture content of the plant stem is About 20%, peel off the surface layer, then cut the surface layer obtained by peeling it off, pass through a 30-mesh sieve, then add 0.15% by weight of modified shell powder, mix evenly, and obtain the airbag fiber bundle tube, take the airbag fiber bundle tube Mix with equal mass of polyaluminum ferric chloride to obtain a solid mixture, heat the solid mixture to 72°C by far-infrared, stir during the heating process, and spray 1% chitosan acetic acid solution at the same time, wherein the chitosan acetic acid solution...

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Abstract

The invention relates to the technical field of water pollution control, in particular to industrial heavy metal wastewater treatment method based on flocculation, flotation and sedimentation. The method includes an aeration treatment step, a PH value adjustment step, a flocculation step, an air flotation step and a sedimentation and filtration step. A flocculant is prepared in the steps that healthy water hyacinth plants as raw materials are modified by modification shell powder and chitosan, bonded with polyaluminum ferric chloride and finally mixed with nano-zinc oxide / carbon quantum dot complexing agents. According to the method, the water hyacinth plants serve as the raw materials, the cost is very low, heavy metal ions in wastewater can be effectively treated, no secondary pollutionis caused, and the processing effect is very stable.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to an industrial heavy metal sewage treatment method based on flocculation, flotation and sedimentation. Background technique [0002] Water is the foundation of production, the essence of ecology, and the source of life. As a precious resource, water should be given sufficient attention. In recent years, with the rapid development of industry, the backwardness of sewage treatment technology and the lack of awareness of sewage treatment, many The indiscriminate discharge of sewage has caused serious environmental pollution and waste of water resources, and the discharged industrial wastewater often contains more or less heavy metals. [0003] Heavy metal wastewater is a kind of wastewater with strong toxicity, carcinogenicity, mutagenicity, refractory degradation, and easy enrichment. It has the characteristics of toxic effect, long-term persistence, and non-biodegradabilit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F101/20C02F101/30
CPCC02F1/001C02F1/24C02F1/283C02F1/5236C02F1/66C02F1/72C02F1/76C02F9/00C02F2001/007C02F2101/20C02F2101/30
Inventor 鲁仕宝曾辉李蔚
Owner ZHEJIANG UNIV OF FINANCE & ECONOMICS
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