A compound drinking water defluoridation process

Abstract

The invention discloses a complex drinking water fluorine removing process. According to the complex drinking water fluorine removing process, a fluorine removing method that the addition of an aluminum-base hydroxyapatite fluorine removing agent for coagulation and the adoption of spherical hydroxyapatite for filtration are combined is adopted. A continuous sludge discharging and coagulating column is adopted in the process of coagulating by using the aluminum-base hydroxyapatite fluorine removing agent, and the continuous sludge discharging and coagulating column is internally provided with a static precipitating zone, wherein the area of the static precipitating zone is 1 / 4-1 / 10 of the total area of the continuous sludge discharging and coagulating column. The precipitated flocculate can be discharged continuously through the static precipitating zone so that the height of a flocculate layer in the continuous sludge discharging and coagulating column can be kept to be 1-2 meters and the fluorine removing capability of the aluminum-base hydroxyapatite fluorine removing agent can be fully exerted. The clarified low-turbidity water is fed into a filtering column of spherical hydroxyapatite, so that the concentration of fluorine in the drinking water can be further reduced and the drinking water can reach the drinking-water health standards of the state. By adopting the complex drinking water fluorine removing process disclosed by the invention, a long-term stable fluoride removing effect can be achieved.

Description

technical field [0001] The invention relates to a fluoride removal process, in particular to a compound drinking water fluoride removal process suitable for high fluorine-containing raw water treatment. Background technique [0002] my country's drinking water hygiene standard (GB5749-2006) stipulates that the fluorine content in drinking water should not exceed 1.0mg / L. Fluorosis caused by drinking high-fluoride water is an endemic disease worldwide. In mild cases, it can cause dental fluorosis, and in severe cases, it can cause skeletal fluorosis, resulting in osteoporosis, bone deformation, and even paralysis and loss of working ability. China is one of the countries with the most severe fluorosis in the world. Except for Shanghai, it spreads all over the country, mainly in rural and pastoral areas with relatively backward economy. At present, the population of sick villages due to high fluoride water poisoning is as high as 80 million. Drinking water Fluorine removal is...

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Problems solved by technology

[0003] The current defluoridation methods include membrane filtration, coagulation and adsorption filtration. Membrane filtration is mainly reverse osmosis and electrodialysis. Because the membrane method consumes a lot of electricity, has high operating costs and produces a large amount of waste water, it is basically not suitable for drinking water removal. Fluorine; the coagulation method is rarely used in practice due to unstable effluent quality; the adsorption filtration method has a large attenuation of fluoride removal performance and secondary pollution during the regeneration process, so many equipment are discarded after a short running time, resulting in a lot of waste

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