A novel reducing agent for remediating polluted sites and its preparation method

A reducing agent and site technology, applied in the restoration of contaminated soil, contaminated groundwater/leachate treatment, water pollutants, etc., can solve the problems of increasing the application cost and operation difficulty of micron iron powder restoration technology, and achieve Improve the continuous suspension and migration ability, enhance the reduction ability, and restore the effect of high repair efficiency

Active Publication Date: 2020-03-17
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This further increases the application cost and operation difficulty of micron iron powder repair technology

Method used

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  • A novel reducing agent for remediating polluted sites and its preparation method
  • A novel reducing agent for remediating polluted sites and its preparation method
  • A novel reducing agent for remediating polluted sites and its preparation method

Examples

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preparation example Construction

[0041] The preparation method of the reducing agent of above-mentioned embodiment, comprises the following steps:

[0042] Step 10): dilute the waste molasses with water, the dilution factor is 2-5 times, and then vibrate at room temperature for 5 minutes to make a uniform turbid liquid.

[0043] In step 10), the waste molasses is diluted with water, so that the sugar content is within the range suitable for the development and proliferation of acetic acid bacteria.

[0044] Step 20): Treat the turbid solution obtained in step 10) with moist heat sterilization to obtain a sterilized waste molasses culture solution; specifically include: boiling the turbid solution obtained in step 10) to 100° C. under an atmospheric pressure, and continuously 10 minutes to kill the bacterial propagules, and cooled to 20°C to 40°C in a sterile environment to obtain a sterilized spent molasses culture solution.

[0045] The sterilization process used in step 20) is to avoid the possible inhibit...

Embodiment 1

[0070]According to the preparation method of the reducing agent of the present invention and the distribution ratio of the sample components shown in Table 2, the reducing agent was prepared using the above-mentioned test materials. Mix the prepared reducing agent with the contaminated soil and groundwater in the model test tank prepared by test material 4) for 10 minutes until uniform, and the amount of the reducing agent is 3% (the weight of the dry basis in the reducing agent accounts for the soil and groundwater in the simulated contaminated site) total groundwater quality). Thereafter, the test cell was sealed and maintained at a temperature of 20°C and a humidity of >95%. At the age of 3 days and 10 days after curing, the soil and groundwater in the test tank were collected and the concentration of pollutants in the soil and groundwater and the pH of the soil and groundwater were detected.

Embodiment 2

[0072] The preparation process, maintenance and test process are the same as in Example 1, except that the dosage of the reducing agent is 6% (the dry weight of the reducing agent accounts for the total mass of soil and groundwater in the simulated polluted site).

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Abstract

The invention discloses a novel reducing agent for repairing a contaminated site. The novel reducing agent is prepared from the following components in percentage by mass: 70 percent to 95 percent of micron iron powder and 5 percent to 30 percent of an auxiliary agent, wherein the auxiliary agent is prepared from the following components in percentage by mass: 45 percent of xanthan gum, 54 percent of waste molasses and 1 percent of acetic acid bacteria powder. The reducing agent can also be used for effectively avoiding deposition and agglomeration phenomena in a utilization process of the micron iron powder, and uniform dispersion degrees of the micron iron powder in a polluted soil body and a polluted water body are remarkably improved; an oxidation-reduction potential of a reaction system is greatly reduced, and the reduction removal rate of the micron iron powder on pollutants in the soil and underground water is remarkably improved; the potential of hydrogen of a balance reaction system can be effectively balanced; finally, efficient reduction and recovery of the pollutants in the soil and underground water is realized. Meanwhile, the invention further provides a preparation method of the reducing agent; the utilization rate of waste materials can be realized, the preparation cost is low and the operation is simple and easy.

Description

technical field [0001] The invention belongs to the technical fields of environmental restoration and environmental geotechnical engineering, and in particular relates to a novel reducing agent for repairing polluted sites and a preparation method thereof. Background technique [0002] As an active metal, iron element widely exists in nature, and it contains three valence states: ferric iron, ferrous iron, and zero-valent iron (that is, iron element), which is cheap and easy to get. Among them, zero-valent iron has a strong reducing ability, so it can reduce and degrade highly oxidizing hexavalent chromium ions and chlorine-containing organic pollutants such as chloroalkanes and polychlorinated biphenyls, making them non-toxic or low-toxic Degradation products, thus being used to remove reducible pollutants in soil and water. Zero-valent iron reduction technology has become a new technology with broad application prospects in the field of environmental pollution control and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/08B09C1/10C02F1/70C02F101/22C02F101/36C02F103/06
CPCB09C1/08B09C1/10B09C2101/00C02F1/70C02F1/705C02F2101/22C02F2101/36C02F2103/06
Inventor 夏威夷杜延军冯亚松任伟伟张黎明毕钰璋
Owner SOUTHEAST UNIV
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