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Method for removing nitrobenzene from drinking water

A technology for nitrobenzene and drinking water, applied in separation methods, chemical instruments and methods, water pollutants, etc., can solve problems such as difficult desorption, slow adsorption speed of powdered activated carbon, complicated treatment process, etc., and achieve excellent adsorption performance , Excellent adsorption capacity, simple follow-up treatment

Active Publication Date: 2008-05-28
南京水之灵环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the disadvantages of the existing powdered activated carbon treatment process, such as complex process, slow powdered activated carbon adsorption speed and difficult

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The tap water containing 500 μg / L nitrobenzene was filtered through polypropylene cotton to obtain clear tap water. Fill 2.0g of activated carbon fibers of model ST-800 into the adsorption column (15×90mm), and the filling volume of activated carbon fibers is 12.5cm 3 . Tap water containing 500 μg / L nitrobenzene flows through the activated carbon fiber packed bed at a flow rate of 1 L / h at room temperature. The tap water treatment capacity is 89 L, and the concentration of nitrobenzene in the effluent is 1.5 μg / L. The rate is 99.7%. During the thermal desorption period, the air was passed at a rate of 50mL / min, and the temperature was raised to 105°C at a rate of 3°C / min at room temperature, and kept for 30 minutes; then the temperature was raised to 300°C at a rate of 3°C / min, and kept for 30 minutes. Cool to room temperature, the desorption rate of activated carbon fiber is 99.8%.

Embodiment 2

[0019] The adsorbent activated carbon fibers in Example 1 were changed to models ST-1000, ST-1300, ST-1500, A10 and A12, and other treatment methods were the same as in Example 1. As a result, except that the treatment volume of each batch of tap water changes, others such as adsorption effect and desorption rate remain basically unchanged.

Embodiment 3

[0021] The concentration of nitrobenzene in the tap water in Example 1 is changed to 100 μg / L, and other treatment methods are the same as in Example 1. The treatment capacity of tap water is greatly increased, reaching 280 L, and the concentration of nitrobenzene in the effluent is 0.7 μg / L. The removal rate of benzene was 99.3%; the desorption rate remained basically unchanged.

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PUM

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Abstract

The invention discloses a method used for removing the nitrobenzol in drinking water, the technique of which is that: pretreatment: tap water or source water goes through filtering for removing the suspended materials in the water; small quantity of nitrobenzol in the tap water or the source water is absorbed: under the condition that temperature is 0 to 45 DEG C and flow velocity is 20 to 300BV/h, the small quantity of nitrobenzol in the tap water or the source water is absorbed on activated carbon fibers and gets out of water when the water flow though an adsorbing column that is filled with activated carbon fibers; thermal desorption: air flows at a speed of 1 to 20BV/min during the thermal desorption, room temperature is raised to 105 DEG C at a speed of 0.5 to 10 DEG C/min, and the temperature is kept for 10 to 150 mins and then raised to 180 to 450 DEG C at the speed of 0.5 to 10 DEG C/min, then the temperature is kept for 10 to 150mins and cooled to the room temperature. The remarkable characteristics is that the nitrobenzol removal rate of the drinking water containing nitrobenzol after the treatment of the invention is close to 100 percent; the thermal desorption is employed to realize the reproduction of activated carbon fibers for the absorption of next lot.

Description

technical field [0001] The invention relates to the field of deep purification of drinking water, in particular to a purification method using activated carbon adsorbents. Background technique [0002] In recent years, the pollution of water bodies by organic compounds has become increasingly serious. Among the more than 2,200 kinds of organic compounds that have been monitored in various water bodies, 117 kinds have been identified or suspected to be carcinogens. Although most of the toxic organic pollutants are contained in very small amounts in water, they are very harmful to humans. Nitrobenzene is an important organic chemical raw material used to produce aniline, aniline dyes, explosives, pesticides and pharmaceuticals. In the industry, nitrobenzene is also used as a solvent in the production of paints and polishes for shoes and floors. Due to the wide use of nitrobenzene, nitrobenzene has been detected in the Songhua River, Yellow River, Huaihe River, and Yangtze Ri...

Claims

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Application Information

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IPC IPC(8): C02F1/58C02F1/28B01J20/34C02F101/38
Inventor 唐登勇郑有飞郭照冰何都良王让会杨竹萍朱虹马晶晶
Owner 南京水之灵环保科技有限公司
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