A hydroxyapatite defluoridation filter material device and its process

Abstract

The invention relates to the field of water treatment, in particular to a hydroxyapatite fluoride removal and material filtration device and process. The device comprises a water inlet unit, a mixingpipeline is arranged at an outlet end of the water inlet unit, the device further comprises an online changer and a filter cylinder used for containing a filter material, spherical hydroxyapatite is adopted for the filter material, two openings are symmetrically formed in the exterior of the middle section of the filter cylinder, each opening is internally provided with a filter cloth, the lower end of the mixing pipeline is in an inverted state, the filter cylinder is horizontal, one of the two openings is communicated with the lower end of the mixing pipeline, and a clarification pipeline isarranged outside the filter cylinder and communicated with the other opening; the online changer is arranged in the filter cylinder, the two ends of the filter cylinder are provided with a circulating opening and a filling opening respectively, the filling opening is located above the circulating opening, the filling opening is communicated with the circulating opening through a circulating transducer, and two distance measuring sensors are symmetrically arranged above the filling opening. Accordingly, the fluoride removal effect can be kept in a stable range all the time.

Description

technical field [0001] The invention relates to the field of water treatment, in particular to a hydroxyapatite defluoridation filter material device and a process thereof. Background technique [0002] The problem of fluorine pollution in groundwater in China is serious. The distribution area of ​​high-fluorine water exceeds 1.6 million square kilometers, involving nearly 100 million people who use water. Fluorosis caused by excessive intake of fluoride through drinking water is a serious problem worldwide. Hydroxyapatite is a new material with good effect for defluoridation of groundwater recently, and it has attracted widespread attention because the material itself has no toxic effect. The form of hydroxyapatite includes powder material and spherical granular filter material, and has been applied in some practical projects; however, how to make full use of the adsorption capacity of hydroxyapatite has become one of the bottlenecks restricting its popularization and appl...

AI Technical Summary

Problems solved by technology

The form of hydroxyapatite includes powdery material and spherical granular filter material, and has been applied in some practical projects; however, how to make full use of the adsorption capacity of hydroxyapatite has become one of the bottlenecks restricting its popularization and application

[0003] According to the above-mentioned problem: After retrieval of Chinese Patent No.: CN201210102971.8 discloses a groundwater defluorination device and a defluorination method. When the fluorine content is relatively large, a large amount of powdered hydroxyapatite needs to be used, which will greatly increase energy consumption; at the same time, because powdered hydroxyapatite is not conducive to recycling

In addition, after retrieval: Chinese Patent No.: CN201310022487.9 discloses a drinking water defluorination process and Chinese Patent No.: CN201220510288.3 discloses a new groundwater defluoridation device. Both of the above two technical solutions use spherical hydroxyl Apatite, but when the spherical hydroxyapatite is equipped with polyaluminum chloride, the defluoridation surface of the spherical hydroxyapatite will fall off due to contact with fluorine-containing water. How does the falling part work? Excluded, and not described in detail, if not immediately excluded, the output is too large, it will lead to worsening defluoridation effect, and the water quality effect / standard of fluoride removal is difficult to control within a range of standards; at the same time, spherical hydroxyapatite There is also no explanation on how the filter material layer is quickly replaced. Since spherical hydroxyapatite is a consumable product, it is difficult to control the degree of depletion when targeting groundwater with different fluorine content.

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