Nut Shell Activated Carbon in Wastewater Treatment

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Nut Shell Activated Carbon in Wastewater Treatment
Posting date : Jun 22, 2014
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1. Used for treating chrome-containing wastewater Chromium is a larger dosage mental material in electroplating. Hexavalent Chrome is existed with different forms for the different PH. Activated carbon has very advanced microporous structure, large specific surface area and strong physical adsorption can effectively adsorb Cr (VI) in wastewater. The surface of activated carbon owns a plenty of oxygen groups such as hydroxy(-OH),carboxyl(-COOH), etc. all of which have static adsorption function can make chemical adsorption effect for Cr (VI). After absorption the wastewater can achieve national discharge standards. Experiment shows that Cr (VI) mass concentration in solution is 50 mg/L, PH is 3, adsorption time is 1.5h, the activated carbon adsorption and strainaway rate of Cr (VI) can achieve best results. So the process of using activated carbon to treat chromium-containing wastewater is the result of comprehensive effect of physical adsorption chemical adsorption, chemical reduction of Cr (VI) and etc. in solution. Activated carbon is used to treat chromium-containing waste water, which is stable adsorption, high processing efficiency, low operating cost, and has some social and economic benefits. 2. Used for treating cyanide-containing wastewater In industrial production gold and silver wet extraction, Chemical fiber production, coking, ammonia synthesis, electrofacing, gas production and etc. all use cyanide or byproduct cyanide. So in the process of production must emissions a certain number of cyanide-containing wastewater. Activated carbon used for wastewater purification has a long history. There are more and more reports about applying to cyanogens-contained wastewater. But because activated carbon has small adsorption capacity of the CN HCN, it is not worthwhile in handling costs. 3. Used for treating mercury-containing wastewater Activated carbon has the performance of adsorbing mercury and mercuride, but the adsorption ability is limited, just suitable for treating low mercury content wastewater. If there are higher concentration of mercury in water, firstly can use chemical precipitation method to treat, after treating mercury is about 1 mg/L, even can reach 2

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