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Method for treating PX (para-xylene) wastewater by using active carbon as adsorbent

A technology of activated carbon and adsorbent, which is applied in the field of PX wastewater treatment, can solve the problems affecting the living environment of people and organisms, and achieve the effect of wide source of adsorbent, low treatment cost and large adsorption capacity

Inactive Publication Date: 2013-03-06
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

PX wastewater will have an unpleasant stench, if not treated, it will seriously affect the living environment of people and organisms

Method used

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  • Method for treating PX (para-xylene) wastewater by using active carbon as adsorbent
  • Method for treating PX (para-xylene) wastewater by using active carbon as adsorbent

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Take 57 g of PX aqueous solution with a concentration of 170 ppm, and add 0.04 g of 30-mesh KC-8 activated carbon into the intermittent adsorption vessel filled with wastewater. The adsorption temperature is controlled at 40 °C, and the vibration speed of the adsorber is 100 rpm. The p-xylene concentration in the aqueous solution was measured in real time, and its variation with time was investigated. When the concentration of p-xylene in the aqueous solution no longer changes, it can be considered that the activated carbon has been adsorbed and saturated. At this time, the adsorption capacity of activated carbon was 235 mg / g, the residual PX concentration in water was 13 ppm, and the removal rate of PX in water reached 92.3%.

Embodiment 2

[0029] In order to compare the adsorption effect, the experiments of Example 1 were carried out using KC-6 activated carbon and coal-based activated carbon respectively, and other conditions were unchanged. When KC-6 activated carbon is used, the adsorption capacity of activated carbon is 234 mg / g, the residual PX concentration in water is 16 ppm, and the removal rate of PX in water reaches 90.8%; when coal-based activated carbon is used, the adsorption capacity of activated carbon is 204 mg / g, and the water The residual PX concentration was 32 ppm, and the removal rate of PX in water was 81.2%.

Embodiment 3

[0031] Take 57 g of PX aqueous solution with a concentration of 130 ppm, add 0.04 g of 40-mesh KC-8 activated carbon into the intermittent adsorption vessel containing wastewater, control the adsorption temperature to 40 °C, and the vibration speed of the adsorber to 200 rpm. At adsorption equilibrium, the adsorption capacity of activated carbon was 180 mg / g, the residual PX concentration in water was 3 ppm, and the removal rate of PX in water reached 97.7%.

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Abstract

The invention discloses a method for treating PX (para-xylene) wastewater by using active carbon as an adsorbent. According to the method, the washed and dried active carbon is used as the adsorbent, the wastewater is injected into a container with a certain amount of adsorbent for adsorption, and para-xylene in the wastewater is removed. An adsorption treatment process adopted by the invention comprises intermittent adsorption and fixed bed adsorption. After the wastewater is adsorbed through a certain amount of active carbon, the effluent can reach the standard to be discharged. The method has the obvious advantages of stable and reliable process, simple treatment device, low cost, good adsorption treatment effect and the like. The active carbon adsorbent used by the invention has the characteristics of low price, wide source, simple preparation process, high efficiency, wide applicability, no secondary pollution and the like.

Description

technical field [0001] The invention belongs to the field of waste water treatment, and in particular relates to a method for treating PX waste water with activated carbon as an adsorbent. Background technique [0002] Paraxylene (PX) is an important chemical raw material, which can be used as a thinner for pigments, paints, etc., and a solvent for printing, rubber, leather and other industries. In the production process of organic synthesis, synthetic rubber, paint and dye, synthetic fiber, petroleum processing, pharmaceuticals, cellulose and other related industries, a large amount of xylene waste water and waste gas will be produced, and these xylene waste water and waste gas can be produced and used along with it The waste water discharged by the unit enters the water body. To produce 1 ton of xylene, generally discharge 2 m of waste water containing 300-1000 mg / L xylene 3 . In recent years, the direct discharge of industrial wastewater has caused serious organic poll...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/28C02F101/32
Inventor 邱挺王碧玉黄智贤李玲郑辉东曾瑜
Owner FUZHOU UNIV
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