A method for removing complexed heavy metal ions in water

A technology of heavy metal ions and heavy metals, applied in chemical instruments and methods, water pollutants, multi-stage water treatment, etc., can solve the problems of increased burden, non-biodegradable pollutants, high cost, etc., and achieves wide application range and high removal efficiency High, simple method and effect

Active Publication Date: 2021-02-26
CHONGQING MOLECULAR WATER SYST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, a large amount of complexing agents are still difficult to completely remove, so that the effluent cannot be discharged up to the standard
[0005] Conventional treatment methods for heavy metal wastewater mainly include chemical precipitation, ion exchange, evaporation concentration, electrolysis, activated carbon adsorption, silica gel adsorption and membrane separation, etc., but these methods have incomplete removal, high cost, and toxic pollution. Cons such as mud or other waste
For example, when chemical precipitation is used, the dosage is large, the cost is high, and a large amount of sludge is generated, which increases the burden of subsequent treatment; the ion exchange method is not universal, and different resins need to be selected for different ions, and excessive regeneration waste liquid will be generated. , the salt consumption is large, and the presence of organic matter will pollute the ion exchange resin; the electrolysis method is not suitable for treating low-concentration heavy gold ion wastewater; the activated carbon adsorption method has high treatment costs and is prone to secondary pollution, etc.
[0006] The pollutants contained in the complexed heavy metal wastewater are not biodegradable, have strong toxicity, and can cause cancer through the accumulation in the organism through the food chain
Compared with free heavy metal ions, it is more difficult to remove complex heavy metal ions, and it is difficult to obtain satisfactory treatment effect by ordinary alkali neutralization precipitation method

Method used

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  • A method for removing complexed heavy metal ions in water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Water containing complexed heavy metal ions (Ni 2+ :155mg / L; Zn 2+ :50mg / L)

[0042] 1) Adjust the pH of the water body containing complexed heavy metal ions to 6 and react with the heavy metal replacement reagent sodium sulfide (12g / L). The reaction time is 3 hours, adjust the pH to 9, and then add an anionic polyacrylamide (25g / L tons of water);

[0043] 2) carry out Fenton reaction after step 1) gained supernatant is adjusted pH to 2, namely add hydrogen peroxide 6L / ton of water (hydrogen peroxide content 30%) and ferrous ion 8kg / ton of water (ferrous sulfate), the reaction time is 2 hours, then adjust the pH to 8.5 for precipitation;

[0044] 3) Adjust the pH of the supernatant obtained in step 2) to 5 and react with the heavy metal replacement reagent sodium sulfide 6g / L. After the reaction time is 3 hours, adjust the pH to 9, and then add the heavy metal scavenger anionic polyacrylamide 12g / ton water, to obtain the heavy metal ion content in the supernatant ...

Embodiment 2

[0046] Water containing complexed heavy metal ions (Ni 2+ :88mg / L; Zn 2+ :55mg / L; Pb 2+ :20mg / L)

[0047] 1) Adjust the pH of the water containing complexed heavy metal ions to 1 and react with the heavy metal replacement reagent sodium sulfite 5g / L. The reaction time is 2 hours, adjust the pH to 10, and then add the heavy metal scavenger neutral polyacrylamide 20g / ton of water;

[0048] 4) carry out Fenton reaction after step 1) gained supernatant is adjusted pH to 1, namely add hydrogen peroxide 10L / ton of water (hydrogen peroxide content 30%) and ferrous ion 3kg / ton of water (ferrous sulfate), the reaction time is 3 hours, then adjust the pH to 8.5 for precipitation;

[0049] 5) Adjust the pH of the supernatant obtained in step 2) to 4 and react with the heavy metal replacement reagent sodium sulfite 10g / L. The reaction time is 4 hours, adjust the pH to 9, and then add the heavy metal scavenger polyaluminum chloride 100g / ton of water to obtain The content of heavy met...

Embodiment 3

[0051] Water containing complexed heavy metal ions (Ni 2+ :205mg / L; Zn 2+ :89mg / L; Pb 2+ :18mg / L; Cu 2+ :50mg / L)

[0052] 1) Adjust the pH of the water containing complexed heavy metal ions to 5 and react with the heavy metal replacement reagent ferric chloride 25g / L. The reaction time is 3 hours, then adjust the pH to 8.5, and then add 50g / ton of heavy metal scavenger cationic polyacrylamide water;

[0053] 2) After adjusting the pH of the supernatant obtained in step 1) to 3, carry out the Fenton reaction, that is, add 20L / ton of hydrogen peroxide (hydrogen peroxide concentration is 30%) and 25kg / ton of ferrous ion water (ferrous sulfate), and the reaction time For 4 hours, then adjust the pH to 9 for precipitation;

[0054] 3) Adjust the pH of the supernatant obtained in step 2) to 3 and react with the heavy metal replacement reagent ferric chloride 15g / L. The reaction time is 3 hours, then adjust the pH to 9, and then add the heavy metal scavenger polyaluminium ferric...

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Abstract

The invention relates to the technical field of wastewater treatment, in particular to a method for removing complexed heavy metal ions in water. The invention provides a method for removing complexed heavy metal ions in water, comprising the following steps: 1) reacting the water containing complexed heavy metal ions with a heavy metal replacement reagent, and then adding a heavy metal scavenger. The method for removing complexed heavy metal ions in the water body is simple, easy to operate, low in cost, has a wide range of removable heavy metal ion concentrations, and can be efficiently removed, and the concentration of heavy metal ions in effluent water is less than 0.1 ppm.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a method for removing complexed heavy metal ions in water. Background technique [0002] The electroplating industry is known as one of the three major polluting industries in the world today. The wastewater discharged during the production process contains heavy metal ions such as chromium, copper, and nickel, as well as highly toxic substances such as cyanide and a large number of organic pollutants. The water quality is complex and difficult to control, and it is one of the most difficult industrial wastewater to treat. The heavy metal ions and their compounds contained in these wastewaters are toxic, and if they are discharged without effective treatment, they will cause serious harm to the environment and human beings. For example, after nickel enters the human body, it will stay in the spinal cord, brain, lungs and heart, inhibiting the enzyme system, leading ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F101/20
CPCC02F1/52C02F1/66C02F1/683C02F1/722C02F9/00C02F2101/20C02F2301/08C02F2305/026
Inventor 乔向利赵斌元郑哲魏平远
Owner CHONGQING MOLECULAR WATER SYST
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