Denitrification electrode material for eliminating nitrate in underground water, and preparation method and application thereof

Abstract

The invention discloses a denitrification electrode material for eliminating nitrate in underground water, and a preparation method and application thereof. The preparation method comprises the following steps: (1) subjecting waste rubber to mechanical crushing at first and sieving next, and then successively carrying out soaking with an organic solvent, cleaning with clear water, drying and calcining so as to obtain carbon black; (2) uniformly mixing the obtained carbon black with starch, adding an organic solvent and carrying out stirring until the obtained mixture is in the shape of dough;and (3) compacting the obtained mixture on a substrate made of a rigid porous material, carrying out standing until the mixture is totally dried, then punching the rigid porous material, and carryingout microbial biofilm culturing so as to obtain a single-piece denitrification electrode material. According to the invention, a plurality of single-piece denitrification electrode materials having undergone electron supplementation via a chemical approach are successively arranged in an area, where to-be-treated underground water circulates, at intervals; through holes in adjacent single-piece denitrification electrode materials are arranged in a stagger way; all the single-piece denitrification electrode materials are connected in series; and underground water is sequentially treated by thesingle-piece denitrification electrode materials so as to remove nitrate in the underground water.

Description

technical field [0001] The invention belongs to the technical field of waste water treatment, and in particular relates to a material preparation method capable of eliminating groundwater nitrate. Background technique [0002] Groundwater is one of the important drinking water resources. According to statistics, more than half of the cities in my country use groundwater as the main water source. With the continuous growth of population and rapid economic development in our country, the human demand for groundwater is also increasing. However, in recent decades, with the development of industry and agriculture, groundwater in many areas has been polluted by nitrates to varying degrees. Excessive nitrate concentrations in groundwater can threaten human health. The toxic effect of nitrate itself is not great, but after nitrate is ingested into the human body, under acidic conditions, nitrosamines will be synthesized, which will cause methemoglobinemia, and in severe cases, it...

AI Technical Summary

Problems solved by technology

However, the biological method also has defects. The lack of electron donors in groundwater leads to a decrease in treatment efficiency. If electron donors are added, it is easy to cause secondary pollution.

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