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Eco-friendly river lake arsenic in-situ treatment composite material and preparation method and application thereof

An in-situ treatment and composite material technology, applied in the field of environmental application materials, can solve problems such as secondary pollution water quality risks, and achieve the effects of reducing secondary pollution risks, reducing bioavailability, and reducing arsenic toxicity

Active Publication Date: 2019-04-12
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Purpose of the invention: In view of the existing river and lake arsenic pollution control problems, the risk of secondary pollution of water quality by effective arsenic in river and lake sediments, and the long-term detection of arsenic in rivers and lakes, the present invention provides an eco-friendly river and lake arsenic in-situ treatment compound The composite material is a material that combines physical, chemical and biological effects to achieve stable oxidation of trivalent arsenic in river and lake water, stable transformation of available arsenic in sediment, efficient reduction of total available arsenic content, and secondary pollution of water quality. Risk reduction, etc., there is good eco-friendliness

Method used

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  • Eco-friendly river lake arsenic in-situ treatment composite material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 1. Non-metallic minerals-biomass charcoal series:

[0035] (1) Corn stalk biochar (referred to as BC): The corn stalks purchased in the market were washed, dried, and impurities were removed, and then ground and pulverized. Finally, in a tube furnace, nitrogen was used as a protective gas, and the temperature was raised to 500°C at a rate of 5°C / min. After constant temperature pyrolysis for 4 hours, the temperature was naturally lowered, and kept for later use.

[0036] (2) iron reform (denoted as BC Fe ): Weigh an appropriate amount of BC and FeCl 3 Under the ratio of iron-carbon mass ratio of 1:1 and 1:5 respectively, impregnate and stir for 8 hours, then bake in a blast drying oven at 60°C for 5 hours, take it out in a muffle furnace and incinerate at 400°C for 2 hours, cool down Sealed and stored for later use, respectively marked as BC Fe1 and BC Fe0.2 .

[0037] (3) Immobilized microorganisms (denoted as BC Fe1 -PSB): Wrap BC with carbonized cotton cloth Fe...

Embodiment 2

[0042] (1) After washing, drying and removing impurities, activated carbon purchased on the market is ground and pulverized. Finally, in a tube furnace, nitrogen was used as a protective gas, and the temperature was raised to 500°C at a rate of 5°C / min. After constant temperature pyrolysis for 4 hours, the temperature was naturally lowered, and kept for later use.

[0043] (2) iron reform: take the activated carbon and FeCl that step (1) obtains 3 Under the ratio of iron to carbon mass ratio of 1:10, impregnate and stir for 10 hours, then bake in 80°C blast drying oven for 4h, take it out and incinerate at 500°C for 1h in a muffle furnace, cool down and seal it for later use .

[0044] (3) Immobilized microorganisms: wrap step (2) with carbonized cotton cloth to obtain the iron-modified non-metallic mineral carrier. In the solution, wrap the carrier with carbonized cotton cloth: Bacillus subtilis bacteria solution = 1: 50g / mL, cultivate and acclimatize for 36 hours at 20°C, ...

Embodiment 3

[0049] (1) After the kaolin purchased in the market is washed, dried, and impurities are removed, it is ground and pulverized. Finally, in a tube furnace, nitrogen was used as a protective gas, and the temperature was raised to 500°C at a rate of 5°C / min. After constant temperature pyrolysis for 4 hours, the temperature was naturally lowered, and kept for later use.

[0050] (2) iron reform: take the activated carbon and FeCl that step (1) obtains 3 Under the ratio of iron to carbon mass ratio of 1:10, impregnate and stir for 10 hours, then bake in 80°C blast drying oven for 4h, take it out and incinerate at 500°C for 1h in a muffle furnace, cool down and seal it for later use .

[0051] (3) Immobilized microorganisms: use carbonized cotton cloth to wrap step (2) to obtain the iron-modified non-metallic mineral carrier, and the carbonized cotton cloth is 5% of the quality of the iron-modified non-metallic mineral carrier, and then contain 7.5 billion CFU / mL PSB (photosyntheti...

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Abstract

The invention discloses an eco-friendly river lake arsenic in-situ treatment composite material and a preparation method and application thereof. The composite material is formed by adsorbing and combing a carbonized material, an iron-modified non-metal mineral, immobilized microorganisms and peroxides buried by a high molecular polymer. For the problems of existing arsenic pollution control in rivers and lakes, secondary pollution water quality risks of sediment effective arsenic in the rivers and lakes and long-term arsenic detection in rivers and lakes, the composite material is provided, wherein the composite material is a material combined through physical, chemical and biological actions, the effects of stable oxidation of trivalent arsenic covering water on the rivers and lakes, stable conversion of the sediment effective arsenic, efficient reduction of total effective arsenic content, reduction of the secondary pollution water quality risks and the like are achieved, the eco friendliness is good, the preparation process is simple, the use is convenient, the raw material utilization rate is high, secondary pollution cannot be caused, the prepared composite material achieveslong-term monitoring of the arsenic content in the rivers and lakes, and the cumbersome and cost of arsenic detection are reduced.

Description

technical field [0001] The invention belongs to the technical field of environmental application materials, and relates to the development of materials for efficient treatment of arsenic in rivers and lakes and its eco-friendly treatment, in particular to an eco-friendly compound material for in-situ treatment of arsenic in rivers and lakes, its preparation method and application. Background technique [0002] Arsenic (As) is a highly toxic, carcinogenic, and metalloid element. Its toxicity has the characteristics of persistence and concealment. It is widely distributed in nature, and most of them are in the form of compounds. It is often found in environmental media such as groundwater, soil, and estuary sediment. middle. [0003] At present, common arsenic treatment in rivers and lakes mainly includes physical, chemical, biological, electrodynamic and other restoration methods. Although chemical remediation may cause secondary pollution of water quality, it is widely used...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/34C02F101/10
CPCC02F3/34C02F2101/103
Inventor 祝建中徐菲菲苏梦陈靓曹艳艳
Owner HOHAI UNIV
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