A process and equipment for removing nitrate in drinking water

Abstract

The invention relates to a process and equipment for removing nitrate in drinking water. The raw water is injected into a reaction tank, the resin in the reaction tank is ion-exchanged with the nitrate in the raw water, and the raw water after ion exchange forms product water and is discharged from the reaction tank. The resin after ion exchange is injected into the resin temporary storage tank and settles in the resin temporary storage tank. The settled resin is gradually deposited at the bottom of the resin temporary storage tank to the height of the overflow hole, and the excess water and resin are discharged from the overflow hole Return to the reaction tank; open the bottom valve of the resin temporary storage tank, so that the resin flows into the regeneration tank under the action of gravity, inject the regeneration liquid into the regeneration tank for resin regeneration; inject the regenerated resin into the reaction tank again through the resin injector within; repeat the above process to achieve instant regeneration and continuous water production. The invention solves the problem that the fixed bed resin cannot run continuously, and has the advantages of less resin dosage, low cost, continuous operation, stable and balanced water production, and the like.

Description

technical field [0001] The invention relates to a drinking water purification process and equipment, in particular to a process and equipment for removing nitrate in drinking water, and belongs to the technical field of drinking water purification. Background technique [0002] With the development of the economy, the groundwater in many countries is polluted by nitrate to varying degrees. Since the 1980s, the nitrate pollution of groundwater in my country has become more and more serious. The monitoring data of 41 cities showed that 1 / 3 of the cities had nitrate pollution in the groundwater at that time, and the pollution was very serious in some areas. [0003] The current standard of the World Health Organization (WHO) was established in 1984. Its guiding standard for the content of nitrate nitrogen in drinking water is 10 mg / L, and the recommended standard is 5 mg / L. The American standard is 10 mg / L. The new "Drinking Water Hygienic Standards" officially implemented in...

AI Technical Summary

Problems solved by technology

Due to the limitation of its process characteristics, if the fixed bed wants to continuously supply water, it must be "one use and one standby"; this will increase the equipment investment and cost, and another disadvantage of the fixed bed is that the removal rate of new resin or resin just regenerated is high. Its removal rate gradually decreases over time; therefore, the water production rate of the equipment is not stable

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