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Resourceful treatment method for high-salinity wastewater

A technology of high-salt wastewater and treatment methods, applied in the direction of oxidized water/sewage treatment, etc., can solve the problems of unbearable enterprises, high investment and operating costs

Inactive Publication Date: 2012-09-26
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In addition, a few enterprises in developed countries use methods such as wet oxidation, catalytic wet oxidation and incineration to treat high-salt wastewater, but the investment and operating costs of these methods are very high, and most domestic enterprises cannot afford them.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] Step 1: Use hydrochloric acid to adjust the pH value of epichlorohydrin wastewater (TOC=1620mg / L, NaCl=21.5%) to 3.0, then add 800mL of the pH-adjusted water sample to a 1000mL three-necked round-bottomed flask, and then add the three-necked The flask was placed in a constant temperature water bath at 90°C. A stirring bar was installed in one of the middle ports of the three-necked flask, and a pH electrode was inserted into the other two ports, and the other was used as a drug dosing port. Turn on the mechanical stirring and preheat the water sample.

[0059] Step 2: Weigh ferrous chloride (FeCl 2 4H 2 O) 4.3g (about 21.6mmol), then dissolve it in 10mL of water as a catalyst; use a measuring cylinder to take 45mL of 30% hydrogen peroxide (about 0.44mol) as an oxidizing agent.

[0060] Step 3: When the temperature of the water sample in the three-necked flask is basically the same as the temperature of the water bath, add 0.5mL of catalyst dropwise from the dosing por...

Embodiment 2

[0064] Step 1: Except that the temperature of the water bath is 80° C., the others are all the same as in Example 1.

[0065] Step 2-Step 4: Same as Example 1.

[0066] The TOC was measured and the result was 128mg / L, which met the requirement of TOC<200mg / L for the brine entering the diaphragm electrolyzer.

Embodiment 3

[0068] Step 1: Same as Example 2.

[0069] Step 2: Weigh ferrous chloride (FeCl 2 4H 2 O) 4.3g (about 21.6mmol) and copper chloride (CuCl 2 2H 2 O) 0.1g (about 0.06mmol), and mix the two together, then dissolve the mixture of the two in 10mL of water as a catalyst; use a measuring cylinder to take 45mL of 30% hydrogen peroxide (about 0.44mol) as an oxidizing agent .

[0070] Step 3 and step 4 are the same as in Example 1.

[0071] The TOC measurement result is 90mg / L, which meets the requirement of TOC<200mg / L for the brine entering the diaphragm electrolyzer.

[0072] Comparing Examples 2 and 3, it can be seen that adding a small amount of copper chloride in ferrous chloride can improve the effect of catalytic wet peroxide oxidation.

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PUM

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Abstract

The invention discloses a resourceful treatment method for high-salinity wastewater, comprising the following steps of: removing organic pollutants of organic high-salinity waste water by adopting a catalysis wet-type peroxide oxidation method; and oxidizing the content of total organic carbon (TOC) of the high-salinity wastewater to be below a maximum limit value of salt water which flows into an electrolytic cell of a chloralkali plant, so that the high-salinity waste water subjected to the catalysis wet-type peroxide oxidation treatment can be used as a raw material for producing chlorine and caustic soda in the chloralkali plant, so that resourceful utilization of the high-salinity wastewater can be realized.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a catalytic wet peroxide oxidation technology for high-salt organic wastewater. Background technique [0002] In the production process of epichlorohydrin, epoxy resin, vinylidene chloride, vanillin, hydrazine hydrate and glufosinate and other products, a large amount of organic wastewater containing high concentration of sodium chloride (referred to as high-salt wastewater) will be produced . For example, the concentration of total organic carbon (TOC) in the waste water produced by glycerin production of epichlorohydrin is about 1500mg / L, and the concentration of sodium chloride is about 20% by mass; 1,1,2-trichloroethylene and The concentration of TOC and sodium chloride in the waste water produced when sodium hydroxide is used to produce vinylidene chloride is about 4500mg / L and about 20%, respectively. [0003] For high-salt wastewater, most of the relevant do...

Claims

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Application Information

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IPC IPC(8): C02F1/72
Inventor 曹国民刘勇弟盛梅洪芳帅小丹胡林林丽敏高洁朱菲菲孙铭浩唐琪玮王若飞郁一村方彬
Owner EAST CHINA UNIV OF SCI & TECH
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