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Method for treating water containing iron, manganese and arsenic

A water treatment, iron-based technology, applied in water/sewage treatment, chemical instruments and methods, adsorbed water/sewage treatment, etc., can solve problems such as increasing the cost of preparing granular materials

Inactive Publication Date: 2009-06-24
VEOLIA WATER SOLUTIONS & TECH SUPPORT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] This type of method does not require the addition of an oxidizing agent. On the contrary, it requires special preparation of granular materials. For this purpose, specific equipment and corresponding funds are required, so the cost of preparing granular materials has to be increased.

Method used

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  • Method for treating water containing iron, manganese and arsenic
  • Method for treating water containing iron, manganese and arsenic

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Embodiment Construction

[0054] exist figure 1In the schematically shown industrial water treatment unit, water is fed through pipe 1 into a filter 2, which in this case is open, i.e. at atmospheric pressure, but in other embodiments it can be any other types.

[0055] The filter contained a filter bed consisting of a mixture of about 70% by volume iron hydroxide particles and about 30% by volume manganese dioxide particles. It should also be noted that these ratios can, for example, be varied in other embodiments that can be considered, in particular according to the iron and manganese content of the water to be treated. More typically, the bed contains 5-95% by volume iron and 95-5% by volume manganese.

[0056] The filter medium 3 is supported on a perforated or striped base plate 11 . In addition, note that the filter 2 is fitted with a functioning emptying device 13 .

[0057] exist figure 1 In the case of the open filter shown, water passes by gravity through the filter bed 3 and is collect...

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Abstract

A method for treating water to produce potable water is described herein. The inventive method enables the efficient removal of iron, manganese, and arsenic without the addition of powerful oxidants and without requiring a complex procedure for preparing the filtering material. The described method treats the water by passing the water through at least one bed of filter material, where the filter material comprises an association of manganese dioxide grains and at least one iron-based divided material in the hydroxide, oxide, or metallic state. The association may comprise a mixture of the iron-based divided material and the manganese dioxide grains. Alternatively, the association may comprise a superposition of layers of the iron-based divided material and the manganese dioxide grains.

Description

technical field [0001] The present invention relates to water treatment methods. More precisely, the present invention relates to a process for preparing water intended for human drinking consumption by reducing iron, manganese and arsenic. Background technique [0002] Iron removal relies in principle on the oxidation of iron and the resulting formation of insoluble oxides (Fe(OH) 3 , Fe 2 o 3 ) reservation. Oxidation with oxygen or chemical oxidizing agents (such as chlorine, chlorine dioxide, potassium permanganate or ozone) must achieve a sufficient redox potential. The most commonly used oxidizing agent in this regard is potassium permanganate. [0003] Arsenic removal is based on its chemical oxidation and absorption on insoluble metal hydroxides (typically iron or aluminum). [0004] Typical physicochemical methods for removing manganese and iron from water include chemical oxidation of the manganese and / or iron contained therein by potassium permanganate, chlor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/64B01J23/34B01D24/24B01J20/06C02F1/28B01J20/34C02F1/72
CPCB01J20/0229B01J20/06B01J2220/42B01J20/0222C02F1/64Y10S210/912
Inventor A·盖德
Owner VEOLIA WATER SOLUTIONS & TECH SUPPORT