Process for purifying benzo pollutants in waste water

A technology for benzene-based pollutants and waste water, applied in water pollutants, chemical instruments and methods, extraction water/sewage treatment, etc., can solve the problems of rectification method, high price of diethylbenzene, difficulty in recovering extractant, etc. , to achieve better separation and extraction effect, easy and safe operation, and reduce purification pressure.

Inactive Publication Date: 2011-08-17
BEIJING INST OF CLOTHING TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage is that the price of diethylbenzene is relatively high, and rectification is required to recover the extractant, which is difficult
[0012] In addition, some work such as ozone oxidation, photochemical oxidation and other treatment methods are still in the research stage

Method used

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  • Process for purifying benzo pollutants in waste water
  • Process for purifying benzo pollutants in waste water
  • Process for purifying benzo pollutants in waste water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] At room temperature, add n-pentane to the benzene-containing wastewater. The volume ratios of n-pentane and benzene-containing wastewater are 0.2, 0.5, 1, 2 respectively; after vigorous stirring and mixing for 5 minutes, 15 minutes, 60 minutes, and 180 minutes, stop Stir, stand for layering, take 5-10ml of the lower water sample, use acetone as internal standard, add 1-2 drops of acetone to weigh, use Varian3700 gas chromatograph for benzene content detection, chromatographic conditions: sample chamber temperature 80℃ ; Chromatographic column model OV-101, column temperature 40℃; ion head detector 120℃; carrier gas nitrogen, 30ml / min; hydrogen 30ml / min. The results are shown in Table 1. When n-pentane is used as the extractant, the comparison of benzene content in water and oil phases is shown in figure 1 .

Embodiment 2

[0040] The operation method and conditions are the same as in Example 1, replacing n-pentane with n-hexane. The test results are shown in Table 1.

Embodiment 3

[0042] The operation method and conditions are the same as in Example 1, replacing n-pentane with cyclohexane. The test results are shown in Table 1.

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Abstract

The invention discloses a method for purifying benzene pollutants in wastewater. The method comprises the steps as follows: adding low carbon alkane to the wastewater containing benzene by the volume proportion between the low carbon alkane and the wastewater containing benzene of 0.2 to 2 or 0.05 to 1; intensely churning and mixing for 5 to 180 minutes; standing for stratification; and taking the lower water layer. The purifying method can be applied in the industry to purify the wastewater containing benzene, and has low requirements for environmental conditions. The purification can be completed at the room temperature with simple tools; the operation is simple and safe; the purifying effect is prominent. The method is suitable for high-purity purification of the wastewater containing benzene; the wastewater purified by the method can meet the national standard for industrial water; the recycling rate for the wastewater is increased, so that the energy-saving and environmental-protection functions are effectively served. The method can also reduce the pressure on microbe treating ponds for purifying the wastewater containing benzene, minimize the treatment cost for environmental protection and enhance the economic benefits of the equipment.

Description

Technical field [0001] The invention relates to a method for purifying wastewater, in particular to a method for purifying benzene series pollutants in water by a low-carbon alkane extraction method. Background technique [0002] Chemical, petroleum refining, coal mining, textiles, wood processing, paint manufacturing, pharmaceuticals and other industries emit benzene-containing wastewater during the production process. Benzene is an environmental priority pollutant and has carcinogenic effects. The direct discharge of these waste water into water bodies will cause harm to the surrounding environment and cannot be ignored. Generally, direct combustion and adsorption methods are used in pretreatment to purify. However, due to the expensive price of conventional adsorbents, difficulty in regeneration, and difficulty in operation of combustion equipment, many industrial and mining enterprises have not found corresponding effective methods for the treatment of benzene-containing wast...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/26C02F101/32
Inventor 殷立峰周应斌傅吉全卓超吕翔
Owner BEIJING INST OF CLOTHING TECH
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