Method for treating chromium-containing underground water with modified fly ash

A fly ash and groundwater technology, applied in chemical instruments and methods, adsorption water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems of huge treatment equipment, high cost, low efficiency, etc., and achieve the treatment process Simple and economical, the effect of increasing porosity and enhancing surface energy

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 underground water with modified fly ash
  • Method for treating chromium-containing underground water with modified fly ash
  • Method for treating chromium-containing underground water with modified fly ash

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Experimental program
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specific Embodiment approach

[0015] Modified fly ash of the present invention handles the method for chromium-containing groundwater, and its preferred embodiment is:

[0016] After the modified fly ash is added to the chromium-containing groundwater for reaction, the treated chromium-containing groundwater is obtained, and the modified fly ash is prepared through the following steps:

[0017] Weigh 20g of fly ash and add it to 140mL of sulfuric acid solution with a concentration of 0.5mol / L, modify at room temperature for 5 hours at a speed of 200r / min, wash with deionized water for 3 times, and dry at 105°C to obtain the modified Sexual fly ash.

[0018] Described sulfuric acid adopts the product of AR Sinopharm Group Chemical Reagent Beijing Co., Ltd.

[0019] The chromium-containing concentration of the chromium-containing groundwater is 5 mg / L, and 0.03 g of the modified fly ash is added per 100 mL of chromium-containing groundwater, and reacted for 3 hours.

[0020] During the reaction, the temper...

Embodiment 1

[0023] 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.

[0024] Weigh different amounts of modified fly ash, add to 50mL water sample with chromium (VI) concentration of 5mg / L, shake at 25°C at a speed of 140r / min for a period of time, centrifuge and determine chromium (VI) ) concentration and calculate its removal rate.

[0025] Use this material to treat water containing chromium (VI), pH=2 is appropriate ( figure 1 ), the best dosage is 0.03g of 100mL water sample ( image 3 ), reaction 3h ( figure 2 ), the removal rate of chromium (VI) can reach more than 99%, and the effluent can meet ...

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Abstract

The invention discloses a method for treating chromium-containing underground water with modified fly ash, which comprises the following steps: adding modified fly ash into chromium-containing underground water, and reacting to obtain treated chromium-containing underground water. The modified fly ash is prepared through the following steps: weighing 20g of fly ash, adding into 140mL of 0.5mol / L sulfuric acid solution, modifying at a rotation speed of 200r / min at room temperature for 5 hours, cleaning with deionized water 3 times, and drying at 105 DEG C to prepare the modified fly ash. The treatment process is simple and economic; and the fly ash has flocculation promotion action and is beneficial to the augmentation and sedimentation of floccules, so that the treated waste water can be quickly clarified.

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 fly ash. 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 efficiency. Co...

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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