Method for treatment of low-concentration mercury containing wastewater by utilizing modified pelelith

A volcanic rock, low-concentration technology, applied in chemical instruments and methods, adsorption water/sewage treatment, inorganic chemistry, etc., can solve the problems of no patented technology and mercury-containing wastewater, and achieve easy operation, environmental protection and pollution-free Treatment effect, effect of strong adsorption capacity

Inactive Publication Date: 2013-05-29
CHINESE RES ACAD OF ENVIRONMENTAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, there have been no reports of using volcanic rocks to treat mercury-containing wastewater, and there is no related patented technology

Method used

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  • Method for treatment of low-concentration mercury containing wastewater by utilizing modified pelelith
  • Method for treatment of low-concentration mercury containing wastewater by utilizing modified pelelith
  • Method for treatment of low-concentration mercury containing wastewater by utilizing modified pelelith

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The influence of different traditional adsorbents on the adsorption capacity of volcanic rocks:

[0033] Such as figure 1 Shown: The volcanic rock is modified by traditional adsorbent treatment processes such as hydrochloric acid, sulfuric acid, ethanol, acetone, sodium hydroxide, and ferric chloride. The shaker is shaken for 12 hours, and then washed until the effluent is nearly neutral. Dry at 105℃; add 4g of modified volcanic stone adsorbent to 500mL mercury-containing wastewater with an initial concentration of 0.5mg / L, shake the shaker for 1h, and the pH of the water body is 10.86. From figure 1 It can be seen that the adsorption rate of mercury on the modified volcanic stone adsorbent is greatly affected by the modification conditions, and the modified volcanic stone has the highest adsorption rate after treatment with ferric chloride.

Embodiment 2

[0035] The influence of different pH values ​​on the adsorption capacity of modified volcanic rocks:

[0036] Such as figure 2 As shown, under the conditions of water pH of 3.83, 5.64, 7.38, 9.15, 10.89 and 11.5, 4g of modified volcanic sorbent was added to 500mL of mercury-containing wastewater with an initial concentration of 0.5mg / L. Oscillate for 1h. From figure 2 It can be seen that the mercury adsorption rate of the modified volcanic stone adsorbent is greatly affected by the pH change of the water body, and the adsorption rate is higher under alkaline conditions. When the water body pH ≈ 11, the modified volcanic stone has a greater effect on mercury. Adsorption capacity.

Embodiment 3

[0038] The effect of different dosages of modified volcanic adsorbents on adsorption performance:

[0039] Add 1g, 2g and 4g of modified volcanic stone adsorbent to 500mL mercury-containing wastewater with an initial concentration of 0.5mg / L and a pH of 10.89, and shake the shaker for 1h. image 3 "○" in the curve indicates that the dosage of modified volcanic stone adsorbent is 1g, which accounts for 0.2% of the mass percentage of mercury-containing waste water; "▽" indicates that the dosage of modified volcanic stone adsorbent is 2g, which is The mass percentage of mercury-containing waste water is 0.4%; "□" means that the dosage of modified volcanic stone adsorbent is 4g, which accounts for 0.8% of the mass percentage of mercury-containing waste water. It can be seen that the ratio of the dosage of modified volcanic rock to the quality of wastewater is in the range of 0.2-0.8%, and the adsorption rate does not change much, and can still reach more than 92%. At the same time, t...

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Abstract

The invention discloses a method for the treatment of low-concentration mercury containing wastewater by utilizing modified pelelith. The method comprises the following steps: (1) crushing the pelelith, putting the pelelith into a prepared traditional adsorbent solution for modification and filtering and drying, thereby obtaining a pelelith adsorbent; (2) treating the mercury containing wastewater by utilizing the pelelith adsorbent; and (3) detecting the wastewater and discharging the detection-qualified wastewater. As the method for the treatment of the mercury containing wastewater by utilizing the modified pelelith adsorbent is used, on the basis of controlling the cost, the problem that the mercury content in the low-concentration mercury containing wastewater exceeds the specified standard is solved. The method is low in cost, simple in equipment, simple and convenient to operate, short in treatment period, time-saving, labor-saving, environment-friendly and free of pollution in treatment process and good in treatment effect. In addition, the pelelith adsorbent can be repeatedly recycled for multiple times.

Description

Technical field [0001] The invention relates to a method for treating mercury-containing wastewater, in particular to a method for treating low-concentration mercury-containing wastewater by using modified volcanic stones. Background technique [0002] Mercury is a highly toxic metal element, which is more harmful to the environment and has been listed as a priority pollutant by many international organizations. Mercury-containing wastewater is one of the most serious industrial wastewaters that pollute the environment. A large amount of mercury-containing wastewater is generated in mercury smelting, lead-zinc smelting, electrochemistry and other industries. Among them, mercury-containing smelting, recycled mercury smelting, chlor-alkali industry, plastics Wastewater discharged from industrial and electronic industries is the main source of mercury pollution in water bodies. At present, the consumption of mercury in my country is increasing year by year, and mercury pollution is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/28B01J20/10B01J20/30
Inventor 廖海清吴丰昌李强
Owner CHINESE RES ACAD OF ENVIRONMENTAL SCI
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