Filling material used for removing permeable reactive barrier of nitrate and preparation method thereof

Abstract

The invention relates to the technical field of water purification and water pollution prevention and treatment and particularly discloses a filling material used for removing a permeable reactive barrier of nitrate and a preparation method of the filling material. The filling material used for removing the permeable reactive barrier of the nitrate comprises the raw materials of pretreated iron powder, activated carbon and coarse sand, wherein the volume ratio of the pretreated iron powder to the activated carbon to the coarse sand is 3:1:6. The filling material has the advantages that the filling material used for removing the permeable reactive barrier of the nitrate, which is prepared by adopting the proportion and the preparation method, is low in cost and simple to prepare, is used for the remediation and treatment of nitrate pollution of a high-concentration nitrate pollution area and has an obvious demonstration effect on treating the nitrate pollution in underground water; the treatment steps are reduced, the treatment cost is lowered, the underground resources are sufficiently utilized, the good ecological environment of the underground water is restored, and economic loss caused by water source area pollution is effectively reduced, so the filling material used for removing the permeable reactive barrier of the nitrate has a good economic benefit.

Description

(1) Technical field [0001] The invention relates to the technical fields of water body purification and water pollution prevention and control, in particular to a filling material for a permeable reaction wall for removing nitrate and a preparation method thereof. (2) Background technology [0002] Due to the excessive application of chemical fertilizers and organic fertilizers in the process of agricultural production, and the nitrogen-containing wastewater discharged in the process of industrial production, it has infiltrated into groundwater for a long time, resulting in an increase in nitrate content in groundwater, especially in underground drinking water sources, groundwater The content of nitrate nitrogen exceeds the standard, which poses a threat to drinking water safety and the ecological environment, and seriously affects the health of the people. [0003] Excessive nitrates in drinking water can cause serious harm to human health. When the nitrate content in drin...

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Problems solved by technology

[0004] Nitrate has high solubility in water, good stability, and is difficult to form co-precipitation or adsorption. Traditional simple water treatment technologies, such as lime softening and filtration, are difficult to remove nitrate in water.

At present, the main research methods for removing nitrate from water include redox method, biological denitrification method, ion exchange method and electroosmosis method, etc., but these technologies generally have high treatment costs, and domestic research and extraction are mainly based on laboratory experiments.

Ion exchange method and electroosmosis method only remove nitrate nitrogen in water through ion exchange, not reduce it to ammonia nitrogen, nitrite or nitrogen, and do not achieve the effect of fundamental removal in essence; electroosmosis method The operation is very complicated, the required cost is high, and the practicability is poor. The biological denitrification method needs a new carbon source, and it needs to be anaerobic to meet the test requirements. It is easy to generate nitrite under aerobic conditions. Reaction conditions are strictly controlled, which is difficult to achieve in field experiments

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