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A method for in-situ remediation of nitrate pollution in groundwater

An in-situ remediation and groundwater technology, applied in the treatment of polluted groundwater/leachate, chemical instruments and methods, biological water/sewage treatment, etc. lower biochemistry questions

Active Publication Date: 2016-09-28
HEFEI UNIV OF TECH
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  • Claims
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Problems solved by technology

However, the disadvantage is that the growth of autotrophic microorganisms Slow growth, low biochemistry of elemental sulfur and sulfide, very slow chemical reaction with microorganisms

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  • A method for in-situ remediation of nitrate pollution in groundwater

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Experimental program
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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: 30mmol / L NaHCO 3 , 4mmol / L NaNO 3 , 10mmol / L FeSO 4 、1mmol / LCH 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...

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Abstract

The invention discloses a method for in-situ restoration of nitrate pollution in groundwater, which is characterized in that low-grade siderite ore is crushed and sieved to obtain 0.1-1mm particles, and trenches are excavated in the aquifer perpendicular to the flow direction of groundwater And fill the siderite particles to build an underground permeable wall, inject the nitrate-dependent iron-oxidizing bacteria solution, and oxidize the siderite to reduce nitrate under the action of the anaerobic microorganisms that rely on the nitrate-dependent iron-oxidizing bacteria. Neonatal iron oxide also has the function of adsorbing and purifying other pollutants in 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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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/28C02F3/34C02F103/06
Inventor 岳正波陈天虎邢波波庆承松杨哲
Owner HEFEI UNIV OF TECH