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Device and method for groundwater defluorination

A groundwater and water distribution device technology, applied in chemical instruments and methods, water pollutants, water/sewage multi-stage treatment, etc., can solve the problems of unobvious economy, slow fluoride ion migration speed, difficult recycling and reuse, etc. Achieve the effect of simple process and guaranteed water quality

Active Publication Date: 2012-08-01
江苏河清海晏环境有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, powdery hydroxyapatite is difficult to recycle and reuse in the process of groundwater treatment, so the utilization rate of fluoride removal capacity is low; recent research has improved the existing problems of powdery hydroxyapatite, and in the powdery material Based on the research and development of spherical granular filter materials, it can be used in the form of filter columns or filter tanks, which partially solves the problem that powdery hydroxyapatite is difficult to recycle.
However, due to the relatively large particle size of the filter material, the migration speed of fluoride ions in the filter material is slow, and a complicated regeneration process is required after a period of use, and the economy is not obvious.

Method used

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  • Device and method for groundwater defluorination
  • Device and method for groundwater defluorination

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The coagulant is aluminum sulfate, and the dosage is 20mg / L; the hydroxyapatite is micron powder, and the dosage is 80mg / L; the thickness of the suspended mud layer is 0.8m; the quartz sand is graded quartz sand filter material , The effective particle size d10 is 0.8mm, the non-uniformity coefficient K80 is 1.3, the thickness of the filter material is 0.8m, and the filtration rate is 10m / h. The initial concentration of fluoride ion in groundwater was 5 mg / L, and the fluoride ion concentration in the effluent of the device was reduced to 0.8 mg / L.

Embodiment 2

[0032] The coagulant is made of aluminum sulfate, and the dosage is 10 mg / L; the hydroxyapatite is micron powder, and the dosage is 100 mg / L; the thickness of the suspended mud layer is 1.0 m; the quartz sand is filtered by graded quartz sand The effective particle size d10 is 0.8mm, the non-uniformity coefficient K80 is 1.3, the thickness of the filter material is 1.0m, and the filtration rate is 8m / h. The initial concentration of fluoride ion in groundwater was 3.6 mg / L, and the fluoride ion concentration in the effluent of the device was reduced to 0.7 mg / L.

Embodiment 3

[0034] The coagulant is polyaluminum chloride, and the dosage is 5mg / L; the hydroxyapatite is micron powder, and the dosage is 200mg / L; the thickness of the suspended mud layer is 1.2m; the quartz sand is graded quartz sand For the filter material, the effective particle size d10 is 0.8mm, the non-uniformity coefficient K80 is 1.3, the thickness of the filter material is 1.2m, and the filtration rate is 12m / h. The initial concentration of fluoride ion in groundwater was 4.0 mg / L, and the fluoride ion concentration in the effluent of the device was reduced to 0.53 mg / L.

[0035] Example 1-3 The effluent from the filter tank enters the water supply pipe network after being sterilized, and the water quality is shown in Table 1.

[0036] Table 1 Water quality after treatment by hydroxyapatite-based groundwater defluorination method

[0037] Example number 1 2 3 Initial concentration of fluoride ion (mg / L ) 5.1 4.8 4.5 Fluoride ion concentration in efflue...

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Abstract

The invention discloses a device and a method for groundwater defluorination . The device sequentially comprises a water inlet unit, a clarifying unit and a filtering unit from bottom to top, wherein the water inlet unit comprises a water inlet pipe, a coagulating agent dosing port, a powder hydroxyapatite dosing port and a water distribution device; all reagents and raw water are fully mixed in the water distribution device; a suspended sludge layer is arranged in the clarifying unit, and a sludge discharge port is arranged at the upper part of the suspended sludge area; and a filtering material is filled in the filtering unit. The raw material, a coagulating agent and powder hydroxyapatite are respectively dosed into the water distribution device of the water inlet unit via the water inlet pipe, the coagulating agent dosing port and the powder hydroxyapatite dosing port, mixed, then driven to go upwards, input into the clarifying unit, further conveyed to the filtering unit from a filter plate at the top after being clarified by the suspended sludge layer of the clarifying unit and discharged from a water outlet after being filtered by the filtering material of the filtering unit, and the residual sludge is discharged by the sludge discharge port. According to the device and the method disclosed by the invention, fluoride ions in groundwater can be economically, effectively and safely removed, the water quality needs not to be regulated again, the process is simple, and the water quality of outlet water is ensured.

Description

technical field [0001] The invention relates to a device or method for removing fluoride ions in groundwater based on powdered hydroxyapatite. Background technique [0002] Fluorosis is a widespread endemic disease worldwide, and drinking water is an important route of intake. China is one of the countries with the most serious fluorine pollution in the world. Except Shanghai, it is distributed in all provinces of the country, involving nearly 100 million people. According to the water quality characteristics of groundwater, research and development of defluoridation method is one of the hot spots in the drinking water treatment industry. [0003] At present, the main defluoridation technologies formed at home and abroad mainly include coagulation sedimentation method, activated alumina adsorption method, electrodialysis method, reverse osmosis method, ion exchange method, adsorption method, bone charcoal adsorption, zeolite defluoridation method, etc., but in practical app...

Claims

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Application Information

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IPC IPC(8): C02F9/08C02F1/52C02F1/28C02F101/14
Inventor 刘成陈卫张谦李俊林
Owner 江苏河清海晏环境有限公司
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