A device for in-situ removal of ammonia nitrogen during shore filtration and water intake

Abstract

The invention provides a device for insitu removing ammonia nitrogen in the bank filtration water taking process. The device comprises an adsorbing box, a packing area A, a packing area B and a packing area C which are separated from one another through division boards are formed in the adsorbing box, wherein the division boards are provided with holes to enable the packing area A to be communicated with the packing area B and enable the packing area B to be communicated with the packing area C; the packing area A is provided with water inlets, and water outlets are formed in the bottom of the packing area C; the packing area A is filled with a mixture of oxygen releasing materials containing bentonite and natural river sand; the packing area B is filled with alkaline-modified attapulgite; the packing area C is filled with natural zeolite with the particle size ranging from 1 mm to 2 mm. According to the device for insitu removing ammonia nitrogen in the bank filtration water taking process, in the bank filtration water taking process, the oxygen releasing materials and the alkaline-modified attapulgite are utilized to achieve dynamic in-situ removing of the ammonia nitrogen, the ammonia nitrogen concentration of groundwater in the area can be at least reduced to the III standard of the quality of the groundwater, and the pollution problem of ammonia nitrogen in existing groundwater is solved.

Description

technical field [0001] The invention relates to the technical field of water purification, in particular to a device for removing ammonia nitrogen in situ during the process of water intake by shore filtration. Background technique [0002] Onshore water extraction originated in Europe in the 1870s and became common after World War II. After World War II, shore filtration was widely used in countries along the banks of major European rivers such as the Rhine, Elbe, Danube and Seine to obtain drinking water due to the pollution of the rivers by municipal and industrial wastewater. [0003] The effects of filtration, adsorption, acid-base neutralization, redox, hydrolysis, biogeochemistry and other natural attenuation effects in the process of water intake by shore filtration can better remove pollutants. Efficient and low-cost drinking water treatment or pretreatment methods have received worldwide attention. [0004] With the development of the economy and the growth of th...

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Problems solved by technology

[0009] However, at present, the remediation of groundwater ammonia nitrogen pollution in the riverside area focuses on ex-situ remediation, and there are few studies on in-situ remediation methods.

However, most of the existing in-situ repair researches use PRB technology or the combination of PRB technology and other technologies, and the problem of the reaction medium in PRB technology has been in the exploratory stage.

In addition, attapulgite is used as an adsorption material in water treatment. Most of the research at home and abroad focuses on the adsorption of organic substances and heavy metals, and the research on the adsorption of ammonia nitrogen also focuses on the research on wastewater such as medicine, printing and dyeing; therefore At home and abroad, there has been no research on the use of attapulgite rods as adsorption media for ammonia nitrogen removal in the process of shore filtration and water intake.

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