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Method for simultaneous removal of chromate (CrO4<2->) and trichloroethylene (TCE) in water

A technology of trichloroethylene and chromate, applied in chemical instruments and methods, water pollutants, water/sewage treatment and other directions, can solve the problems of high cost and large amount of surfactants, achieve convenient operation, improve retention rate, The effect of improving performance

Inactive Publication Date: 2015-03-11
LANZHOU JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It can not only solve the problem of excessive amount of surfactant and high cost in the process of treating wastewater, but also improve the retention rate of surfactant in the permeate

Method used

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  • Method for simultaneous removal of chromate (CrO4&lt;2-&gt;) and trichloroethylene (TCE) in water
  • Method for simultaneous removal of chromate (CrO4&lt;2-&gt;) and trichloroethylene (TCE) in water
  • Method for simultaneous removal of chromate (CrO4&lt;2-&gt;) and trichloroethylene (TCE) in water

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Experimental program
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Effect test

Embodiment 1

[0025] 1. Determination of chromium content

[0026] (1) Determination method: diphenylcarbazide spectrophotometry

[0027] (2) Preparation of required reagents:

[0028] ①(1+1) Sulfuric acid solution: Dissolve 50mL of concentrated sulfuric acid (98%) solution in 50mL of deionized water.

[0029] ②(1+1) Phosphoric acid solution: Dissolve 50mL of concentrated phosphoric acid (98%) solution in 50mL of deionized water.

[0030] 3. Chromogen (I): take diphenylcarbazide (C 13 h 14 N 40 ) 0.2g, dissolve in 50mL acetone, add deionized water to dilute to 100mL, and shake well.

[0031] ④Standard stock solution of chromium: Potassium chromate (K 2 Cr 2 o 7 ) 0.2829g, dissolved in deionized water, transferred to a 1000mL volumetric flask, diluted to the mark, and shaken well (each mL solution contains 0.1mg hexavalent chromium).

[0032] (3) Test method:

[0033] ① Take a certain amount to be measured in a 50mL colorimetric tube and dilute it to the 10mL mark with deionized wa...

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Abstract

A method for simultaneous removal of chromate (CrO4<2->) and trichloroethylene (TCE) in water comprises the following steps: (1) non ionic surfactant and cationic surfactant micellar enhancement and (2) ultrafiltration. Through compounding of a non ionic surfactant and a cationic surfactant, the properties of the surfactants can be improved, CMC (critical micelle concentration) of the surfactants can be reduced, the dosage of the surfactants can be reduced, ultimately the cost is reduced, the retention rate of the surfactants in a permeability retention can be improved, and secondary pollution of the environment can be reduced. Experiments show that, simultaneous removal rate of the CrO4<2-> reaches up to 85%, simultaneous removal rate of the TCE reaches up to 72%, the permeation flux is 1.8L / (m<2>.s), and the retention rate of the surfactants reaches up to 85%.

Description

technical field [0001] The invention relates to a domestic sewage treatment method, in particular to a method capable of simultaneously removing CrO in water 4 2- and trichlorethylene (TCE) methods. Background technique [0002] With the rapid development of industry and agriculture, a large number of organic chlorinated hydrocarbons represented by trichlorethylene (TCE) enter the environment due to unreasonable use, treatment and disposal, causing serious pollution to the soil and groundwater environment. TCE is the most widespread one of the pollutants. At present, the main methods researched at home and abroad to remove TCE are: activated carbon adsorption, air stripping method, microbial degradation method, metal or bimetallic reduction method, and advanced oxidation method. However, these treatment methods have their own shortcomings, such as the inability to make TCE harmless, high treatment costs, and difficulties in large-scale promotion and industrialization. ...

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Application Information

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IPC IPC(8): C02F1/44C02F1/58C02F1/62
CPCC02F1/444C02F2101/22C02F2101/36
Inventor 赵保卫李玮王璐
Owner LANZHOU JIAOTONG UNIV
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