Preparation and use method of FeS for repairing hexavalent chromium pollution underground water

A groundwater, hexavalent chromium technology, applied in water/sewage treatment, chemical instruments and methods, reduced water/sewage treatment, etc., can solve the problems of many impurities, imperfect properties, unfavorable engineering use, etc., to achieve excellent properties, FeS Excellent properties and strict quality control

Inactive Publication Date: 2015-07-22
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the preparation and use methods of FeS repair agents reported in current literature and patents are not perfect and reliable.
This is mainly due to the nature of FeS itself, including: (1) the FeS prepared under the current process conditions is impure, has many impurities, and the content of impurities and samples is not clear, etc., (2) the prepared FeS reagent is not repaired Hexavalent chromium pollutes groundwater for the purpose, and its properties are not perfect (3) The clogging in the underground porous medium environment has a serious negative impact on the actual repair of chromium-contaminated groundwater, which limits the application of FeS
[0007] In summary, the existing FeS reagents cannot exert their excellent properties, and thus it is difficult to meet the requirements of remediation of groundwater polluted by hexavalent chromium, which is not conducive to the use of practical projects.

Method used

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  • Preparation and use method of FeS for repairing hexavalent chromium pollution underground water
  • Preparation and use method of FeS for repairing hexavalent chromium pollution underground water
  • Preparation and use method of FeS for repairing hexavalent chromium pollution underground water

Examples

Experimental program
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Effect test

Embodiment 1

[0040] The following experiments were designed to study the application of different pH to FeS removal of hexavalent chromium in simulated groundwater, and the reaction was carried out in a numerically controlled constant temperature shaking incubator. First draw 100mL of an aqueous solution containing 10mg / L hexavalent chromium into a 250mL glass bottle, then add 2mL of FeS suspension containing 43.96mg / L into a 250mL glass bottle, the pH value of the hexavalent chromium solution ranges from 1 to 9 . Cover the rubber plug, put it into a constant temperature shaking incubator, control the reaction temperature at 20°C, and the rotation speed at 150r / min, draw 2mL of the solution with a syringe at regular intervals, and measure the residual hexavalent in the aqueous solution at different intervals (min). Chromium concentration, calculate the removal rate of hexavalent chromium (see Table 2).

[0041] The removal rate (%) of FeS to hexavalent chromium under the different pH cond...

Embodiment 2

[0044] The following experiments were designed to study the application of different temperatures on FeS removal of hexavalent chromium in simulated groundwater, and the reaction was carried out in a numerically controlled constant temperature shaking incubator. First draw 100mL of an aqueous solution containing 10mg / L hexavalent chromium into a 250mL glass bottle, then add 2mL of FeS suspension containing 43.96mg / L into a 250mL glass bottle, the pH of the hexavalent chromium solution is about 6.80. Cover the rubber plug, put it into a constant temperature shaking incubator, control the reaction temperature at 10°C (15°C, 20°C and 25°C), and the rotation speed at 150r / min, draw 2mL of the solution with a syringe at regular intervals, and measure different time (min) Interval concentration of hexavalent chromium in the aqueous solution to calculate the removal rate of hexavalent chromium (see Table 3).

[0045] Table 3 Removal rate (%) of FeS to hexavalent chromium under differ...

Embodiment 3

[0048] The following column experiment was designed to preliminarily study the application of FeS suspension to remove hexavalent chromium in simulated groundwater under dynamic conditions. Choose a plexiglass column with a height of 30 cm and an inner diameter of 8 cm. The filling material used in the experiment is medium sand (with a particle size between 0.25 and 0.50 mm). Before the experiment started, the glass column was saturated with water from top to bottom for about two hours, and then the glass column was placed horizontally. Then 20 mL of freshly prepared FeS suspension (25 g / L) was injected into the middle and bottom of the experimental column, and the same volume of deionized water was injected into the control experiment. Inject 10 mg / L hexavalent chromium solution from the left end through a peristaltic pump at a flow rate of 1 ml / min. Measure the concentration of hexavalent chromium at the outlet when running at different times, the results are as follows f...

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Abstract

The invention discloses a preparation and use method of FeS for repairing hexavalent chromium pollution underground water, relates to treatment on the underground water, provides a preparation and use method of a FeS repair reagent, and solves the problems of impure ingredients, excessively large particle size and difficulty in estimating the quantity demanded of the FeS repair reagent, complexity and difficulty in maintenance of matched equipment and the like, can improve repair efficiency and accords with the practical engineering application. (1) under the oxygen-free condition, the required FeS repair reagent is prepared from ferrous sulfate and sodium sulfide hydrate by a homogeneous precipitation method; (2) the centrifuging and deionized water washing process is repeated for three times to purify the reagent; (3) the reagent enters a polluted area by an injection pump through an injection well and an extraction well so as to fulfill the repair aim. Reduction and precipitation capacity of the FeS is sufficiently applied so as to realize a reinforced coupling effect of chemical reduction and precipitation. The repair aim can be fulfilled by directly utilizing an existing well on the site without independently arranging the injection well; the preparation and use method is simple and convenient to operate.

Description

technical field [0001] The invention relates to the field of groundwater pollution restoration, in particular to a method for preparing and using FeS, an in-situ restoration reagent for groundwater polluted by hexavalent chromium. Background technique [0002] In recent years, with the wide application of chromium in electroplating, metallurgy, leather tanning, printing and dyeing, wood processing, chemical and other industries, a large amount of chromium-containing wastewater and waste residues have been produced, resulting in a large amount of arable land, groundwater, surface water, etc. Polluted by these untreated chromium-containing wastewater and waste residues, chromium pollution incidents occur frequently, which has caused great harm to the environment. Among them, hexavalent chromium has attracted widespread public attention due to its high toxicity and high mobility. [0003] At present, the remediation of chromium-polluted environmental receptors mainly includes:...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/12C02F1/70C02F1/62
Inventor 洪梅陈娟张迪龙
Owner JILIN UNIV
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