A new process of multi-stage planting defluoridation water treatment based on pre-reverse osmosis technology

Abstract

The invention relates to a novel multi-stage planting defluorinated water treatment technology based on a pre-reverse osmosis technique. The technology is characterized by comprising the steps that fluorine-containing raw water, a water treatment agent and planting type hydroxyapatite filter particles are taken as starting raw materials, fluorine-containing raw water pretreating, suspension mixing preparing, first-stage planting of the planting type hydroxyapatite filter particles, second-stage planting of the planting type hydroxyapatite filter particles and defluorination treatment water filtering are conducted, and then treated defluorinated clean water is obtained. According to the novel technology, a planting function and an implanting function are integrated into a whole, both the requirements of planting fluorapatite crystal galactite and the requirements of implanting fluorapatite crystal galactite can be met through first-stage planting and second-stage planting, the planting process and the implanting process are circularly conducted, therefore, the service life of the planting type hydroxyapatite filter particles is greatly prolonged, and regeneration equipment for the planting type hydroxyapatite filter particles does not 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 multi-stage planting defluorination water treatment based on pre-reverse osmosis technology. 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, adsor...

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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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