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In-situ remediation method for nitrate pollutions in groundwater

An in-situ remediation and groundwater technology, applied in the direction of contaminated groundwater/leachate treatment, chemical instruments and methods, biological water/sewage treatment, etc., can solve the problem of low sulfide biochemistry, slow microbial chemical reaction rate, autotrophic The problem of slow microbial growth and reproduction, etc., to achieve the effect of strong adsorption and removal

Active Publication Date: 2014-11-05
HEFEI UNIV OF TECH
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Problems solved by technology

However, the disadvantages are that the value-added of autotrophic microorganisms is slow, the biochemistry of elemental sulfur and sulfide is low, and the chemical reaction rate with microorganisms is very slow.

Method used

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  • In-situ remediation method for nitrate pollutions in groundwater

Examples

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Embodiment Construction

[0027] Non-limiting examples are described as follows:

[0028] Choose siderite ore, with a siderite content of 70%;

[0029] Crush and screen siderite ore to obtain 0.1-1.0mm particles;

[0030] Fill siderite particles into a filter column constructed of glass tubes with a diameter of 30mm and a height of 1000mm;

[0031] Inject 200L of nitrate-dependent iron-oxidizing bacteria solution into the filter column, then fill it with culture medium and culture for 10 days, the microorganisms will adhere to the surface of siderite particles; drain the liquid in the filter column;

[0032] The composition of the medium is: 30mM NaHCO 3 , 4mM NaNO 3 , 10mM FeSO 4 , 1mM CH 3 COONa, 1ml / L mixed trace element solution for microbial culture, 1ml / L mixed vitamin solution for microbial culture;

[0033]Use tap water to prepare simulated water containing 20.0 mg / L of nitrate nitrogen, use a peristaltic pump to transport simulated water from the bottom of the filter column, and simulate...

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Abstract

The invention discloses an in-situ remediation method for nitrate pollutions in groundwater, which is characterized by comprising the steps of crushing low-grade siderite ores, and screening the obtained object so as to obtain particles with a particle size of 0.1-1 mm; excavating a groove in an aquifer perpendicular to the flow direction of groundwater, and filling the siderite particles into the groove so as to build an underground permeable wall; and injecting nitrate-dependent iron oxidizing bacteria liquid for oxidizing siderites and reducing nitrates in the presence of iron oxidizing bacteria of anaerobic microorganism depended nitrates. New iron oxides also have a function of absorbing other pollutants in purified water.

Description

1. Technical field [0001] The invention relates to a method for repairing groundwater pollution. 2. Background technology [0002] In recent years, with the development of industry and agriculture in the world, the concentration of nitrate in groundwater, which is the main source of drinking water, is constantly increasing and tends to deteriorate. Although nitrate itself is not harmful to the human body, after ingestion of nitrate into the human body, it is partially reduced to nitrite under the action of reducing bacteria. Nitrite easily reacts with hemoglobin in the blood to form methemoglobin, which affects the blood's ability to transport oxygen. In addition, it has been found that nitrite can combine with ammonia nitrogen in the stomach to form nitrosamines and nitrosamides, which are highly carcinogenic substances and substances that can cause teratogenic and mutagenic substances. Because of the hazards of nitrates, environmental agencies around the world have set m...

Claims

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Application Information

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IPC IPC(8): C02F3/28C02F3/34C02F103/06
Inventor 陈天虎邢波波庆承松杨哲
Owner HEFEI UNIV OF TECH
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