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Medicament for reducing and removing heavy metal ion in wastewater in coal cutting subsidence area, and processing method

A technology of heavy metal ions and treatment methods, which is applied in the field of chemical agents for reducing and removing heavy metal ions in coal mining subsidence area wastewater and its treatment. It can solve the problems that the technology has not been reported in the literature, and achieve the effect of reducing load and good application prospects.

Inactive Publication Date: 2007-10-10
NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After searching, there is no literature report on the technology of using polymer substance chelating agent to reduce heavy metal ions in coal mining subsidence area wastewater to make it meet the discharge standard

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Preparation of chelating agent

[0024] (1), put 99% polymer polyamines currently available on the market into a three-necked flask, then add deionized water with 20% volume of the three-necked flask, and stir evenly;

[0025] (2), heat the water bath to a temperature of 30°C-35°C, add 20ml-40ml of 25% NaOH solution, and stir evenly;

[0026] (3), put 5ml~10ml of CS 2 Put it in the separatory funnel, adjust the stirrer to the stirring speed of 150 rpm to 200 rpm, unscrew the cock of the separatory funnel, and add CS dropwise into the three-necked flask 2 , the dropwise addition is completed within one hour;

[0027] (4) After reacting for 20 minutes to 40 minutes, the final polymer chelating precipitant is obtained, and the polymer chelating precipitant contains polar groups that can chelate heavy metals in precipitation water—dithioamino groups.

Embodiment 2

[0029] Treatment of Wastewater in Coal Mining Subsidence Area with Chemicals

[0030] The treatment method of the present invention comprises the dilution of heavy metal chelating agent (dilutes the stock solution of the agent to a certain concentration), dosing (adding in waste water in a certain proportion), reaction (stirring and reacting for a certain period of time to generate a chelated precipitate), static filtration (filtering drop precipitation), drainage, precipitation recovery, etc., specific examples are as follows.

Embodiment 21

[0032] Aging the prepared chelating precipitating agent for 24 hours to prepare a concentration of 5% as a medicinal solution.

[0033] Take Cu with a concentration of 10mg / L 2+ 1000mL of simulated wastewater with a turbidity of 20NTU, add 0.9mL of the above-mentioned medicinal solution, and use 1% HNO 3 Adjust acidity, 1mol / L NaOH to adjust alkalinity, adjust its pH to 4.0-12.0, add 0.5ml-1.2ml of 5% chelate precipitant solution under stirring with an electromagnetic constant temperature stirrer, stir rapidly for 3 minutes, and slowly stir for 10 minutes , carry out precipitation and flocculation treatment, let stand for stratification, take the supernatant for ICP analysis, the Cu of water after precipitation 2+ The residual concentration was 0.203mg / L, the turbidity was 1.5NTU, and the pH was 7.03. Meet the national emission standards.

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PUM

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Abstract

This invention relates to a reagent for reducing heavy metal ion content in wastewater in coal mining collapse area, and a method for treating wastewater with the reagent. The reagent is polymer with large amounts of polar groups and long chains obtained by reaction between polyamine and CS2. The sulfur atoms in the dithiocarbamate of the reagent can chelate with heavy metal ions through coordination bonds to obtain stable crosslinked chelate precipitate. Thus, heavy metal ions in wastewater in coal mining collapse area are effectively removed. The method comprises: diluting the heavy metal ion chelating reagent, adding into wastewater, and stirring, reacting for a certain time to obtain chelate precipitate, standing, filtering, draining, and recovering the precipitate. The method lays a necessary basis for ecological remediation of wastewater in coal mining collapse area, and reduces the load of biological treatment and plant remediation.

Description

technical field [0001] The invention relates to a medicament for reducing and removing heavy metal ions in coal mining subsidence area wastewater and a treatment method thereof, belonging to the field of water treatment industry and technology. Background technique [0002] The coal mining subsidence area is formed by the disorderly mining of coal. With the rapid development of the national economy and the continuous improvement of the requirements for the ecological environment of human settlements, the water pollution in the coal mining subsidence area has begun to attract the attention of the government, experts and scholars, especially Heavy metal pollution in water bodies has become the top priority of ecological restoration of such water bodies. However, many heavy metal wastewater treatment measures currently have the characteristics of high technical requirements, complex construction, and huge investment, making it difficult to implement treatment generally. In add...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/62C02F1/66C02F101/20C02F103/10
Inventor 张锦瑞李富平牛福生魏瑞霞韩冬芸律文智
Owner NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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