Green preparation method and application of offshore polluted sediment remediation material

A technology for remediating materials and sediments, which is applied in the field of green preparation of remediation materials for offshore polluted sediments, and can solve the problem that the remediation materials are difficult to apply to in-situ remediation of marine sediments, limit the large-scale application of bio-enhancement technologies, and improve the biological effectiveness of heavy metals, etc. problem, to achieve the effect of improving bioremediation efficiency, low cost and high efficiency

Active Publication Date: 2021-03-02
DALIAN UNIV OF TECH
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  • Description
  • Claims
  • Application Information

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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  • Green preparation method and application of offshore polluted sediment remediation material

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Embodiment 1

[0024] (1) Preparation of seaweed extract

[0025] Collect offshore kelp, remove surface sediment, chop it and mix it with water at a mass ratio of 1:40, place it in a reactor, control the temperature at 120°C, and react for 150 minutes. After the liquid is separated, the precipitate is recovered, and the liquid phase is diluted 5 times with water, which is the seaweed extract;

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

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

[0028] (3) Remediation of polluted sediments

[0029] Total petrol...

Embodiment 2

[0031] (1) Preparation of seaweed extract

[0032] Collect offshore kelp, remove surface sediment, chop it and mix it with water at a mass ratio of 1:50, place it in a reactor, control the temperature at 130°C, and react for 120 minutes. Cool to room temperature, and the mixed solution in the reactor is solidified After the liquid is separated, the precipitate is recovered, and the liquid phase is diluted 5 times with water, which is the seaweed extract;

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

[0034] Add the above-mentioned seaweed extract into the reactor, control its volume to be half of the reactor, add FeSO 4 ·7H 2 O, controls Fe 2+ The concentration is 0.06mol / L, and the reactor is closed; then stirred at 1000r / min for 15 minutes, and the pH is controlled to be 10 during the stirring process; after the solid-liquid separation of the obtained suspension, the precipitate is washed twice with water and dried in vacuum to obtain a magnetic composit...

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Abstract

The invention provides a green preparation method and application of an offshore polluted sediment remediation material, which belong to the technical field of environmental remediation. A seaweed extracting solution is used as a reaction material and a stabilizer, a composite material containing seaweed organic matter and magnetic iron oxide is prepared in a green mode, and then the composite material is applied to offshore polluted sediments so as to strengthen the indigenous microorganism degradation function and heavy metal stabilization, and the polluted sediments are efficiently repairedunder natural conditions. The method has the effects and benefits that the remediation material is simple in preparation process and low in cost, can generate a magnetic biological effect, slowly releases various seaweed organic matters and can reduce the bioavailability of heavy metals, so that the remediation efficiency of polluted sediments is improved, the method can effectively overcome thetechnical bottle diameter that a conventional biological enhancement technology is difficult to be applied to in-situ remediation of marine polluted sediments on a large scale, and has a wide application prospect in remediation of marine sediments and coastal wetlands with organic pollution, heavy metal pollution and combined pollution of the organic pollution and the heavy metal pollution.

Description

technical field [0001] The invention belongs to the technical field of environmental restoration, and relates to a green preparation method and application of offshore polluted sediment restoration materials. Background technique [0002] With the rapid development of coastal industrialization and urbanization, pollutants discharged into the sea (such as petroleum hydrocarbons, heavy metals, etc.) have increased sharply, resulting in the continuous destruction of the ecological environment of offshore sediments, 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 covering method, dredging method, etc.), the cost is high, and it has a great impact on the benthos community and its functions. In chemical repair (such as chemical oxidation, rinsing, etc...

Claims

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Application Information

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Patent Type & Authority Applications(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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