Method for reducing chlorine-containing organic substance in dechlorination treatment water by surface modified catalytic iron

A technology of surface modification and catalytic iron, which is applied in the direction of reduced water/sewage treatment, chemical instruments and methods, electrochemical water/sewage treatment, etc. It can solve the problems of insignificant increase in reaction rate, high cost of water treatment, limited contact area, etc. problem, to achieve the effect of improving reducing ability, catalytic efficiency and large contact area

Inactive Publication Date: 2009-12-02
TONGJI UNIV
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Problems solved by technology

But copper and iron (generally copper sheet and iron sheet etc.) of metal form are used in the method, because copper, iron contact area is limited, and reaction rate improves not obviously, and the ratio of copper and iron is 1: 10~1: 1, and copper If the amount of addition is too much, the cost of water treatment is higher

Method used

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  • Method for reducing chlorine-containing organic substance in dechlorination treatment water by surface modified catalytic iron

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1: the comparison of the inventive method and other iron reduction methods treatment effect

[0019] Step 1: Weigh four parts of iron shavings of the same weight and one part of reduced iron powder of the same weight. Among the four parts of iron shavings, one part of the surface of the iron shavings is plated with 0.2% copper and loaded into the reactor (referred to as A reaction system). Cetyltrimethylammonium chloride (CTAC) surfactant solution was used for surface modification, and after completion, it was loaded into the reactor with a bulk density of 0.4×10 3 Kg / m 3 , the packing height is 1m (referred to as B reaction system), a copper sheet with 50% of the total weight of iron is added to a part of iron shavings, fully mixed and then loaded into the reactor (referred to as C reaction system), and the last part of iron shavings It is directly loaded into the reactor (called D reaction system), and the reduced iron powder is directly loaded into the r...

Embodiment 2

[0025] Embodiment 2: process the water body polluted by 1,1,2,2-tetrachloroethane (1,1,2,2-TeCA) with the inventive method

[0026]The first step: wash the iron shavings with a copper sulfate solution with a mass concentration of 2%. After the chemical reaction, copper will be deposited on the iron surface. According to the material balance calculation, the copperization rate (i.e. copper-iron mass ratio) deposited on the iron surface is 0.5 %. Soak the copper-plated iron shavings in a cationic surfactant CTAC solution with a mass concentration of 100mg / L to modify the surface of the iron. After the modification is completed, put them into the reactor with a bulk density of 0.6×10 3 Kg / m 3 , The height of the filter material is 0.5m.

[0027] The second step: add the water polluted by 1,1,2,2-tetrachloroethane into the surface modified catalytic iron reduction reactor, the initial pH of the wastewater is 6.7, and the reflux ratio is 5:1 by pump circulation Carry out hydraul...

Embodiment 3

[0031] Embodiment 3: the inventive method handles carbon tetrachloride (CCl 4 ) polluted groundwater

[0032] The first step: soak the weighed iron shavings in 0.1% copper nitrate solution. After the chemical reaction, copper will be deposited on the iron surface. Through material balance calculation, the copperization rate (i.e. copper-iron mass ratio) of iron surface deposition ) is 0.2%. Soak the copper-plated iron shavings in a solution of non-ionic surfactant Triton X-100 with a mass concentration of 50 mg / L to change the hydrophobicity of the iron surface. After modification, put them into the reactor with a bulk density of 0.3×10 3 Kg / m 3 , The height of the filter material is 2m.

[0033] The second step: Add the groundwater polluted by carbon tetrachloride into the reactor, the initial pH of the wastewater is 7.8, and the hydraulic circulation is carried out through the pump circulation mode with a reflux ratio of 2:1, and the water flow direction is from bottom to...

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Abstract

The method for reducing and dechlorinating chlorinated organic substances in water by surface-modified catalytic iron relates to the reductive dechlorination treatment technology for chlorinated organic pollutants in water bodies, and reduces the concentration of chlorinated organic pollutants Toxicity and pollution, suitable for the control of water pollution and the restoration of polluted water. The present invention first catalyzes the surface of the iron used for water treatment through electroless copper plating to improve the reducing ability of iron, and then uses a surfactant to modify the surface of the copper-plated iron to change the hydrophilicity and lipophilicity of the iron surface Features, increase the dissolution and adsorption of organic matter on the iron surface, improve the mass transfer conditions of organic matter transfer to the iron surface, and significantly increase the reaction rate. The method of the invention adopts simple equipment, convenient operation and management, and low cost. Except for the power consumption of the water pump, there is no other energy consumption. Therefore, the method of the invention is a method with low energy consumption and high efficiency, which is beneficial to popularization and application.

Description

technical field [0001] The invention relates to the reduction dechlorination treatment technology of chlorinated organic pollutants in water bodies. Through the reduction dechlorination treatment of polluted water bodies, the toxicity and pollution of chlorinated organic pollutants are reduced, and it is suitable for the control and treatment of water body pollution. Remediation of polluted water bodies. Background technique [0002] Since chlorinated organic compounds are widely used organic compounds, many countries and regions are seriously polluted by chlorinated organic compounds, and various water bodies such as groundwater, surface water, and drinking water are affected by organic compounds such as chlorinated hydrocarbons to varying degrees. pollute. Chlorinated organic pollutants in water have attracted the attention of researchers from various countries because of their high toxicity, difficulty in biological treatment, and long retention time in the environment. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/70C02F1/58C02F1/46
Inventor 吴德礼马鲁铭王红武
Owner TONGJI UNIV
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