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Method for repairing organic pollutants in polluted soil and underground water

A technology for organic pollutants and groundwater, applied in the field of environmental pollution control, can solve the problems of high cost, complex disposal operation of chlorinated aliphatic hydrocarbon pollutants, and large influence of nature factors, and achieve low cost, safe transportation and use, and long-term retention long time effect

Inactive Publication Date: 2018-11-23
NANJING WONDUX ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] Aiming at the problems of complicated disposal operation of chlorinated aliphatic hydrocarbon pollutants in existing soil and groundwater, high cost, and great influence by soil and groundwater property factors, the present invention proposes a preparation method of a composite restoration agent, that is, using sulfide nano-iron Activated persulfate to prepare remediation agent, and proposed a method of remediating organic pollutants in polluted soil and groundwater by using the composite remediation agent prepared by this method, so as to realize simultaneous and efficient disposal of organic pollutants in soil and groundwater

Method used

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  • Method for repairing organic pollutants in polluted soil and underground water

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Effect test

Embodiment 1

[0047] Embodiment 1: a kind of method for repairing polluted soil and organic pollutant in groundwater, concrete steps are as follows:

[0048] (1) Add 100g of nano-sized zero-valent iron into 500ml of deionized water, ultrasonically clean for 15 minutes, discard the distilled water, and keep the nano-sized zero-valent iron particles; add nano-sized zero-valent iron particles into a certain volume of sodium sulfite solution, the concentration of sodium sulfite solution is 0.01mol / L, to ensure that the molar ratio of sulfur: iron is 1:1;

[0049] (2) Place the above-mentioned mixed solution in an atmosphere furnace, and slowly add a sodium borohydride solution with a concentration of 0.1mol / L to the mixture under the condition of nitrogen protection. The molar ratio of sodium borohydride to sulfur is 1:2, and fully stir until Discard the supernatant when there is no obvious gas evolution;

[0050] (3) Wash the black solid obtained in step (2) with absolute ethanol solution th...

Embodiment 2

[0055] Embodiment 2: a kind of method for remediating organic pollutants in polluted soil and groundwater, concrete steps are as follows:

[0056] (1) Add 100g of nanometer zero-valent iron into 500ml of deionized water, ultrasonically clean for 15 minutes, discard the distilled water, and keep the nanometer zerovalent iron particles; add nanometer zerovalent iron particles into a certain volume of sodium sulfite solution, the concentration of sodium sulfite solution is 0.05mol / L, to ensure that the molar ratio of sulfur: iron is 1:2;

[0057] (2) Slowly add sodium borohydride solution with a concentration of 0.2mol / L to the above mixed solution under the condition of nitrogen protection, the molar ratio of sodium borohydride to sulfur is 1:3, fully stir until no obvious gas is released, then discard supernatant;

[0058] (3) The black solid obtained in step (2) was washed three times with anhydrous methanol solution according to the solid-to-liquid ratio of 1:5, and then va...

Embodiment 3

[0062] Embodiment 3: a kind of method for repairing polluted soil and organic pollutant in groundwater, concrete steps are as follows:

[0063] (1) Add 100g of nanometer zero-valent iron into 500ml of deionized water, and after ultrasonic cleaning for 15 minutes, discard the distilled water and keep the nanometer zerovalent iron particles; add nanometer zerovalent iron particles into a certain volume of sodium dithionite solution, The concentration is 0.1mol / L, and the molar ratio of sulfur: iron is guaranteed to be 1:10;

[0064] (2) Slowly add the potassium borohydride solution that concentration is 0.3mol / L in the above-mentioned mixed solution, the mol ratio of potassium borohydride and sulfur is 1:4, discard the supernatant after fully stirring;

[0065] (3) Wash the black solid obtained in step (2) with absolute ethanol solution three times according to the solid-to-liquid ratio of 1:10, and then vacuum-dry it at 70°C;

[0066] (4) Fully mix the dried solid obtained in ...

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Abstract

The invention discloses a preparing method for a composite repairing agent and the composite repairing agent prepared through the method. The preparing method comprises the steps that nanometer zero-valent iron is added in a sulfosalt solution, and a sulfosalt and nanometer zero-valent iron mixed solution is obtained; a hydroboron solution is added in the mixed solution to be sufficiently stirred,sulfide is reduced through the reducing capability of hydroboron, supernate is removed, and a vulcanized nanometer iron solid is obtained; and the vulcanized nanometer iron solid and a persulfate solution are mixed, and the composite repairing agent is obtained. A method for repairing organic pollutants in polluted soil and underground water through the composite repairing agent is further disclosed. The method can be widely applied to water treatment and soil repairing and has the beneficial effects that the production technology is simple, and preparing raw materials are easy to obtain; andsynchronous treatment of the organic matter in the polluted soil and the underground water is achieved, and good economic benefits and social benefits are achieved.

Description

technical field [0001] The invention belongs to the technical field of environmental pollution control, and in particular relates to a composite restoration agent and a preparation method thereof, as well as a method for restoration of organic pollutants in polluted soil and groundwater. Background technique [0002] With the continuous development of my country's urbanization and industrialization process, the adjustment of urban layout and the upgrading of industrial structure, a large number of chemical enterprises have been shut down and relocated, leaving behind a large area of ​​sites polluted by organic pollutants. At present, most polluted sites are facing problems such as soil functional transformation and secondary development. The high-risk organic substances hidden in soil and groundwater may seriously threaten health and environmental safety, which has become an urgent soil environmental problem that needs to be solved. Therefore, it is an urgent problem to be s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08C02F1/72C02F103/06C02F101/30
CPCB09C1/08B09C2101/00C02F1/72C02F2101/30C02F2103/06
Inventor 刘军李钦钦常邦华戴昕郭燕袁建海洪有成
Owner NANJING WONDUX ENVIRONMENTAL PROTECTION TECH CO LTD
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