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Method for treating chromium-containing groundwater by using modified artificial zeolite

A technology of artificial zeolite and modified zeolite, applied in chemical instruments and methods, adsorption water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems of high cost, low efficiency, huge treatment equipment, etc. The effect of increased surface area and enhanced adsorption performance

Inactive Publication Date: 2013-06-19
BEIJING ZHONGDI HONGKE ENVIRONMENT SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These methods all have the problems of huge management equipment, high cost and low efficiency.

Method used

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  • Method for treating chromium-containing groundwater by using modified artificial zeolite
  • Method for treating chromium-containing groundwater by using modified artificial zeolite
  • Method for treating chromium-containing groundwater by using modified artificial zeolite

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specific Embodiment approach

[0029] Modified artificial zeolite of the present invention handles the method for chromium-containing groundwater, and its preferred embodiment is:

[0030] The method for treating chromium-containing groundwater with modified artificial zeolite is characterized in that the modified artificial zeolite is used to treat chromium-containing groundwater, and the modified artificial zeolite is prepared by any of the following methods:

[0031] Method 1: Prepare a ferrous sulfate solution with a concentration of 0.2mol / L, add artificial zeolite at a solid-to-liquid ratio of 1:4, shake in a water bath constant temperature oscillator at a speed of 180r / min at 25°C, and discard the supernatant solution, rinsed with deionized water for 3 times and then dried at 120°C to obtain ferrous sulfate modified zeolite;

[0032] Method 2: Prepare an aluminum chloride solution with a mass fraction of 20%, add artificial zeolite at a liquid-solid ratio of 8ml / g, shake in a water bath constant temp...

Embodiment 1

[0044] Chromium (VI)-containing groundwater: simulated preparation with deionized water, accurately weigh 0.2829g of K 2 Cr 2 o 7 (bake at 120°C for 2 hours), transfer to a 1000mL volumetric flask, dilute to the mark, shake well, and store in a polyethylene bottle as a stock solution. Pipette 25mL into a 500mL volumetric flask, and shake to a constant volume to obtain a chromium (VI)-containing water sample with a concentration of 5mg / L.

[0045] Weigh 1g of ferrous sulfate modified zeolite and add it into 20mL of water sample with chromium (VI) ion concentration of 5mg / L, take a sample after constant temperature oscillation and adsorption for 12h, and measure the concentration of chromium (VI).

[0046] Use this material to treat groundwater containing chromium (VI), when the pH value is 3-4 ( figure 1 ), the liquid-solid ratio of modified zeolite to water sample was 20mL / g ( image 3 ), the adsorption time is 120min ( figure 2 ). The modified zeolite can remove the co...

Embodiment 2

[0048] Weigh 1g of aluminum chloride-modified zeolite and add it to 20mL of water sample with chromium (VI) ion concentration of 5mg / L, and take a sample after 12 hours of constant temperature vibration and adsorption to measure the concentration of chromium (VI).

[0049] Use this material to treat groundwater containing chromium (VI), between pH 4 and 8 ( Figure 5), the optimal dosage is 1.5g / 50mL ( Image 6 ), reaction 2h ( Figure 4 ) after the chromium (VI) removal rate can reach more than 99%, meeting the groundwater environmental quality standard (GB / T14848-93). The adsorption equilibrium conforms to the Freundlich and Langmuir isotherm equation, and the adsorption capacity reaches 5.624mg / g.

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Abstract

The invention discloses a method for treating chromium-containing groundwater by using modified artificial zeolite, which is implemented by carrying out treatment on chromium-containing groundwater by using ferrous sulfate, aluminium chloride and chitosan modified artificial zeolite, the Al content of the surface of the modified artificial zeolite is significantly increased, and [AlO4]5- tetrahedron units with negative charges contained in the skeleton structure of the modified artificial zeolite are increased, and under the action of electrostatic attraction, hexavalent chromium in water is effectively removed; and the specific surface area of the modified artificial zeolite is increased, and the adsorption property of the modified artificial zeolite is enhanced, thereby achieving an effect of removing hexavalent chromium.

Description

technical field [0001] The invention relates to a groundwater pollution treatment technology, in particular to a method for treating chromium-containing groundwater with modified artificial zeolite. Background technique [0002] Chromium is a typical toxic element and has long been regarded as an important research object of environmental geochemistry. The difference in the chemical form and valence state of chromium in the environment directly leads to the difference in its toxicity. Under normal pollution levels, animals, plants and microorganisms living in the soil will show corresponding damage symptoms. Acute and chronic poisoning will occur when the human body is directly or indirectly exposed to different concentrations of chromium pollutants. [0003] In the prior art, chromium pollution control methods mainly include physical methods, chemical methods and biological methods. These methods all have the problems of huge management equipment, high cost and low effic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/28C02F101/22
Inventor 张焕祯黄玉洁张国臣张泉于晓娟李晓梅马莉宁亚涛李亚静彭丽霞
Owner BEIJING ZHONGDI HONGKE ENVIRONMENT SCI & TECH
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