New process of single-stage planting defluorination water treatment based on direct reaction

Abstract

The invention relates to a new process of single-stage planting defluorination water treatment based on direct reaction. The new process is characterized by adopting fluorine-containing raw water, a water treatment agent and a planting type hydroxyapatite filter grain as starting materials; carrying out single-stage planting and planting-removal through the planting type hydroxyapatite filter grain; carrying out defluorination treatment for water filtration, and obtaining treated defluorinated pure water. The new process provided by the invention integrates planting / plating-removal functions into a whole, and the planting type hydroxyapatite filter grain is subjected to planting reaction in a planting reaction kettle through a floatation bed way, so that not only can the requirement on planting fluorapatite crystal lacteal calculus be met, but also the requirement on planting-removal of the fluorapatite crystal lacteal calculus can be met, a planting process and a planting-removal process are carried out at the same time and are cycled, the service life of the planting type hydroxyapatite filter grain is greatly prolonged, and a regeneration device of the planting type hydroxyapatite filter grain has no need to be additionally arranged.

Description

technical field [0001] The invention belongs to the technical field of water treatment technology, and in particular relates to a new technology for single-stage planting defluoridation water treatment based on direct reaction. Background technique [0002] Fluorine is one of the essential trace elements for the human body, but long-term drinking of high-fluorine water can lead to fluorosis, which will seriously affect human health. Therefore, the World Health Organization has announced a regulation that the fluorine content of drinking water should not exceed 1.5mg / L. Nowadays, the research on fluoride removal water treatment methods has been highly valued by various countries. The methods of fluoride removal water treatment published in the previous research mainly include coagulation sedimentation method, chemical precipitation method, electrodialysis method, electrocoagulation method, reverse osmosis method, nanofiltration method, ion Exchange method, adsorption method, ...

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Problems solved by technology

Although this process has the advantages of being able to obtain the ideal defluoridation effect stably for a long time, and the hydroxyapatite defluoridation filter material does not need to be regenerated during operation, it still has the following obvious disadvantages: First, the aluminum-based water treatment material The content of aluminum ions is within the standard range, but it is still higher than that of non-aluminum-based water treatment materials, and there is a risk of aluminum ions exceeding the standard; second, the process and equipment for applying aluminum-based water treatment materials are relatively complicated, and have to go through filtration, coagulation, precipitation, etc. process, the equipment occupies a large area, and the operating cost is high; the third is that the polyaluminum chloride / hydroxyapatite copolymer material has the problem of reduced defluoridation effect at low temperature

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