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A green preparation method and application of an offshore polluted sediment restoration material

A repair material and sediment technology, applied in the field of green preparation of offshore polluted sediment repair materials, can solve the problem of in-situ repair of repair materials that are difficult to apply to marine sediments, limit the large-scale application of bioaugmentation technology, and improve the bioavailability of heavy metals, etc. problems, to achieve the effect of improving bioremediation efficiency, low cost, and high-efficiency restoration

Active Publication Date: 2022-05-27
DALIAN UNIV OF TECH
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AI Technical Summary

Problems solved by technology

[0004] In the current sediment bioaugmentation restoration technology, the main problems are: the cost of co-metabolism substrates, biosurfactants and bacterial agents used is high; the in-situ applicability of adding exogenous bacterial agents is low; Conventional bioaugmentation remediation techniques often lead to increased bioavailability of heavy metals in sediments; and many of the remediation materials used are difficult to apply to in-situ remediation of marine sediments, which severely limits the application of bioaugmentation techniques in the remediation of marine polluted sediments large-scale application of

Method used

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  • A green preparation method and application of an offshore polluted sediment restoration material

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Effect test

Embodiment 1

[0024] (1) Preparation of seaweed extract

[0025] Collect the offshore kelp, remove the surface sediment, chop it and mix it with water at a mass ratio of 1:40, place it in a reaction kettle, control the temperature to be 120 °C, and the reaction time to be 150 min. After the liquid separation, the precipitate is recovered, and the liquid phase part is diluted 5 times with water, which is the seaweed extract;

[0026] (2) Green preparation of magnetic composite materials

[0027] The above-mentioned seaweed extract is added to the reactor, and its volume is controlled to be half of the reactor, and FeSO is added. 4 ·7H 2 O, controls Fe 2+ The concentration was 0.05 mol / L, and the reactor was closed; then stirred at 800 r / min for 20 min, and the pH was controlled to be 10 during the stirring process; after the obtained suspension was separated from solid-liquid, the precipitate was washed twice with water and dried in vacuum to obtain the magnetic composite material ;

[...

Embodiment 2

[0031] (1) Preparation of seaweed extract

[0032] Collect the offshore kelp, remove the surface sediment, chop it and mix it with water at a mass ratio of 1:50, place it in a reaction kettle, control the temperature to be 130 °C, the reaction time is 120 min, cool to room temperature, and the mixture in the reaction kettle is solidified. After the liquid separation, the precipitate is recovered, and the liquid phase part is diluted 5 times with water, which is the seaweed extract;

[0033] (2) Green preparation of magnetic composite materials

[0034] The above-mentioned seaweed extract is added to the reactor, and its volume is controlled to be half of the reactor, and FeSO is added. 4 ·7H 2 O, controls Fe 2+ The concentration was 0.06mol / L, and the reactor was closed; then stirred at 1000r / min for 15min, and the pH was controlled to be 10 during the stirring process; after the obtained suspension was separated from solid-liquid, the precipitate was washed twice with wate...

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Abstract

The invention provides a green preparation method and application of an offshore polluted sediment restoration material, which belongs to the technical field of environmental restoration. Using seaweed extract as reaction material and stabilizer, and green preparation of composite materials containing seaweed organic matter and magnetic iron oxide, and then applied to offshore polluted sediments to strengthen the degradation function of indigenous microorganisms and stabilize heavy metals, under natural conditions Efficient remediation of contaminated sediments. The effect and benefit of the present invention are that the preparation process of the restoration material is simple, the cost is low, and the restoration material can produce magnetic bioeffects, release various algae organic matter slowly, and reduce the bioavailability of heavy metals, thereby helping to improve the restoration efficiency of polluted sediments. It can effectively overcome the technical bottle diameter that conventional bioaugmentation technology is difficult to apply on a large scale in the in-situ remediation of marine polluted sediments, and has broad applications in the remediation of marine sediments and coastal wetlands polluted by organic pollution, heavy metal pollution and their combined pollution prospect.

Description

technical field [0001] The invention belongs to the technical field of environmental restoration, and relates to a green preparation method and application of an offshore polluted sediment restoration material. Background technique [0002] With the rapid development of coastal industrialization and urbanization, pollutants discharged to the sea (such as petroleum hydrocarbons, heavy metals, etc.) have increased dramatically, resulting in the continuous destruction of the coastal sediment ecological environment, which seriously threatens the biogeochemical cycle of the marine ecosystem and its healthy growth. [0003] At present, the remediation technologies of water polluted sediments mainly include physical, chemical and biological methods. For physical restoration techniques (such as mulching method, dredging method, etc.), the cost is high and the impact on the benthic community and its function is large. In chemical remediation (such as chemical oxidation, leaching, e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/62C02F101/20C02F103/08
CPCC02F1/62C02F2103/08C02F2101/20
Inventor 王竞蔡迎雪昝帅君
Owner DALIAN UNIV OF TECH
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