Method for removing perchlorate in drinking water

A perchlorate and drinking water technology, applied in chemical instruments and methods, water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems of small adsorption capacity of activated carbon, difficult analysis of ion exchange, high cost, etc. Achieve the effect of low solubility and good stability

Inactive Publication Date: 2009-06-17
SHANGHAI UNIV
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  • Description
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Problems solved by technology

However, these methods have disadvantages to be solved: the adsorption capacity of activated carbon to perchloric acid is very small, and ion exchange is difficult to analyze. Anaerobic biological reduction method is not suitable for the treatment of drinking water. get practical application

Method used

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  • Method for removing perchlorate in drinking water
  • Method for removing perchlorate in drinking water

Examples

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Effect test

Embodiment 1

[0015] Example 1: Weigh 47.5 g of magnesium chloride, 33.3 g of aluminum chloride, and 60 g of sodium hydroxide, and dissolve them in 1.5 L of water. The mixed solution was magnetically stirred for 48 hours and then filtered. The solid material was dried at 105° C., and then ground. Take 20g of the prepared material and fill it into a cylindrical packed column, pass the drinking water containing 10-100μg / L of perchlorate through the bottom of the column, and pass through the packed column at a flow rate of 60-100ml / h. The top of the packed column flows out. The results showed that after 100 L of drinking water containing perchlorate was treated, the removal rate of perchlorate reached 93-97%, and its concentration fell below 1 μg / L.

Embodiment 2

[0016] Example 2: Weigh 55.5g of calcium chloride, 40.6g of ferric chloride, and 60g of sodium hydroxide, and dissolve them in 1.5L of water. The mixed solution is magnetically stirred for 48 hours and then filtered. The solid material is dried at 105°C, and then processed Grind. Take 10g of the prepared material and put it into 100L drinking water containing 100-1000μg / L of perchlorate. The mixture was stirred for 1 hour and then filtered. The results showed that after 100L of drinking water containing perchlorate was treated, the removal rate of perchlorate reached 87%, and its concentration fell below 10μg / L.

[0017] The solid material referred to in Example 1 is the inorganic layered compound Mg-Al-LDH (LDH means containing OH - The interlayer compound, the original text of LDH is Layered Double Hydroxides).

[0018] The solid material referred to in Example 2 is the inorganic layered compound Ca-Fe-LDH.

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Abstract

The invention relates to a method for removing perchlorates in drinking water and belongs to the technical field of drinking water purifying treatment. The method removes the perchlorates in the drinking water by using an ion exchange principle of inorganic lamellar compounds. The method comprises: a divalent metal compound, a trivalent metal compound and sodium hydroxide are mixed according to a molar mass ratio of 2:1:6 and dissolved directly in deionized water to form a mixed solution; the mixed solution is magnetically stirred at 25 DEG C for 48 hours and then is filtered; and an obtained precipitate is dried at 105 DEG C and ground, and thus lamellar compound powder is obtained. The lamellar compound is filled in a filled column of the prior filtering device as a filtering and absorbing material. After the drinking water containing prechlorates is treated by the filled column, 87 to 97 percent of the prechlorates in the drinking water are removed.

Description

Technical field [0001] The invention relates to a method for removing perchlorate from drinking water, and belongs to the technical field of drinking water purification treatment. Background technique [0002] Perchlorate is one of the most important environmental pollutants in the international water treatment field in recent years. It has toxicological characteristics that interfere with the absorption of iodine in the human body and inhibit the ability of the thyroid to regulate hormone secretion and metabolism. The U.S. Environmental Protection Agency recommends that perchlorate (ClO 4 - ) The concentration cannot exceed 24.5μg / L. [0003] The technology for removing perchlorate in water mainly includes ion exchange method, anaerobic biological reduction method, chemical (catalytic) reduction method, electrochemical reduction method, membrane filtration method and activated carbon adsorption method. However, these methods have shortcomings to be solved: the adsorption capaci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/58C02F1/42
Inventor 戴迎春陈炜炜王家樑顾红竞汪艳洁周吉寺钱光人
Owner SHANGHAI UNIV
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