Preparation method of composite material used in underground water nitrogen pollution remediation technology

Abstract

The invention provides a preparation method of a composite material used ina groundwater nitrogen pollution remediation technology and belongs to the technical field of underground water pollution remediation. The composite material is compositely prepared with zeolite powder, a polymer anda carbon source material. The method comprises the steps of employing a reversed phrase emulsion system (water-in-oil) to prepare the zeolite powder andthe polymer into spherical particles, preparingthe carbon source material into a series of solutions with different concentrations, allowing a certain amount of the spherical particles to be soaked in the carbon source solutions with different concentrations respectively, and carrying out drying to obtain the composite material with different carbon-loading. The composite material can be used as the carrier of denitrification, can effectively sustained-release carbon source for a long time, solves the problem of carbon source lack ina denitrification process, and avoids secondary pollution problem brought by the external carbon source. The zeolite component in the composite material removes ammonia nitrogen by adsorption.

Description

Technical field: [0001] The invention relates to a preparation method of a composite material for groundwater nitrogen pollution restoration technology, which belongs to the technical field of groundwater pollution restoration and can be used for in-situ and ex-situ bioremediation technologies for groundwater nitrogen pollution. Background technique: [0002] 68% of the fresh water sources suitable for drinking on the earth are groundwater, and about 50% of the world's population uses groundwater as their drinking water source. However, whether in industrialized countries or developing countries, due to the application of a large number of chemical fertilizers and pesticides in rural areas, surface pollution, wastewater seepage through rivers to pollute groundwater, discharge and leakage of domestic sewage and feces, industrial wastewater discharge and Leakage, leaching and infiltration of solid waste, dry and wet deposition of atmospheric nitrogen oxides, unreasonable recha...

AI Technical Summary

Problems solved by technology

Although there are many technologies, these methods still have their own limitations in practical application: physical and chemical repair technologies mainly include electrodialysis, reverse osmosis, distillation, ion exchange, etc., all of which concentrate nitrate in the medium or waste In the liquid, only the transfer and concentration of nitrate pollution have occurred, and the nitrate cannot be converted into harmless substances, and the efficiency is low, the selectivity is poor, the investment is high, and the operating cost is high.

Chemical remediation technologies include active metal reduction and catalytic hydrogenation. The problem with these two methods is that while reducing nitrate to nitrogen molecules, part of the nitrate is reduced to ammonium ions, and ammonia nitrogen pollution still exists.

Considering the two aspects of completely eliminating nitrate pollution in groundwater and reducing the cost of denitrification, the biological denitrification method is currently the most economical and effective method that has been put into use. The disadvantage is that the effluent often contains biological solids and dissolved organic matter ( such as external carbon source)

The remediation method of ammonia nitrogen pollution in groundwater is mainly physical and chemical remediation technology, which removes ammonia nitrogen through the ion exchange performance and adsorption performance of zeolite, and there are few reports on the simultaneous removal of ammonia nitrogen and nitrate nitrogen

Images