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Method for removing perchlorate in drinking water

A perchlorate, 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, high cost, unsuitable for drinking water, etc. , to achieve the effect of good stability and low solubility

Inactive Publication Date: 2012-01-04
SHANGHAI UNIV
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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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Embodiment 1

[0015] Example 1: 47.5g of magnesium chloride, 33.3g of aluminum chloride, and 60g of sodium hydroxide were weighed and dissolved in 1.5L 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 drinking water containing 10-100μg / L perchlorate from the bottom of the column, and pass through the packed column at a flow rate of 60-100ml / h Flow out from the top of the packed column. The results show that after 100L drinking water containing perchlorate is treated, the removal rate of perchlorate reaches 93-97%, and its concentration drops 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, dissolve them in 1.5L of water, and filter the mixed solution after magnetic stirring for 48 hours, dry the solid material at 105°C, and then carry out grind. Take 10 g of the prepared material and put it into 100 L of drinking water containing 100-1000 μg / L of perchlorate. The mixture was stirred for 1 hour and then filtered. The results showed that after 100L drinking water containing perchlorate was treated, the removal rate of perchlorate reached 87%, and its concentration dropped below 10μg / L.

[0017] The solid material referred to in Example 1 is the inorganic layered compound Mg-Al-LDH (LDH means an interlayer compound containing OH-, and 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 amolar 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 obtainedprecipitate 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 in drinking water, which belongs to the technical field of drinking water purification treatment. Background technique [0002] Perchlorate is one of the environmental pollutants that has been focused on in the field of international water treatment in recent years. It has toxicological characteristics that interfere with iodine absorption in the human body and inhibit the ability of the thyroid gland to regulate hormone secretion and metabolism. The EPA recommends that perchlorate (ClO 4 - ) concentration cannot exceed 24.5μg / L. [0003] The technologies for removing perchlorate in water mainly include 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 disadvantages to be solved: the adsorption capacity of activated ...

Claims

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Application Information

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Patent Type & Authority Patents(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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