Novel combined defluorinating device for underground water

Abstract

The invention provides a novel combined defluorinating device for underground water. The device comprises a water inlet unit, a defluorinating reaction unit, a pipe chute or cantboard separating area, an initial filter unit, a terminal filter unit, a backwashing device and an electromagnetic exhausting valve which are sequentially arranged from bottom to top, wherein the terminal filter unit comprises a central water inlet pipe as well as a stainless steel filter screen and a closed quartz sand filter layer sequentially arranged from bottom to top, the central water inlet pipe is arranged on the top of the initial filter unit at the bottom and penetrates through the middle parts of the stainless steel filter screen and the quartz sand filter layer, and the lower part of the central water inlet pipe between the stainless steel filter screen and the quartz sand filter layer is stainless steel filter cloth with the aperture of 0-0 mu m; a water collecting area is arranged at the bottom of the quartz sand filter layer, and water outlet pipes which are communicated with each other are arranged on the top of the stainless steel screen and the side wall of the water collecting area. The novel defluorinating device provided by the invention has the advantages of compact structure, small occupied area, low treatment cost, high effluent quality and the like, is convenient to change and flexible to use, and has a good popularization and application prospect.

Description

technical field [0001] The invention belongs to the field of water treatment, in particular to a novel combined groundwater defluorination device. 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. [0003] Existing groundwater defluoridation technologies mainly include coagulation sedimentation, activated alumina adsorption, electrodialysis, reverse osmosis, ion exchange, adsorption, bone charcoal adsorption, and zeolite defluorination, etc. All there are certain problems in this kind of technology, so that there are certain difficulties in its popularization and application. [0004] Hydroxyapatite is a new material with good effect for defluoridation of groundwater recently, and it has...

AI Technical Summary

Problems solved by technology

However, there is also the high cost of ultrafiltration membranes, resulting in high device cost and operating costs, which have certain restrictions on the application in rural areas

Recently, fluoride removal methods and devices using hydroxyapatite as the basic treatment material have appeared one after another, which can achieve better fluoride removal effects, but there are still certain problems in practical applications.

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