Study of possibility using modified concrete with Kaolin absorbent for removeing heavy metal of Chromium (VI) from wastewater

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Asrari Elham; Bazrafkan Mohsen

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Journal: Modares Civil Engineering journal Year:2018 | Volume:18 | Issue:6 Page(s): 27-37

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Information Journal Paper

Title

Study of possibility using modified concrete with Kaolin absorbent for removeing heavy metal of Chromium (VI) from wastewater

Author(s)

Asrari Elham | Bazrafkan Mohsen | Issue Writer Certificate

Keywords

ChromiumQ3

kaolinQ1

Modified concreteQ1

Industrial wastewaterQ2

Abstract

Nowadays, heavy metals are one of the greatest environmental problems. In scientific reports, many cases of poisonings due to the various metals such as Chromium, lead, Mercury, Cadmium, etc. which should be an important warning for control industrial pollution, be considered. This problem intensifies by development of great industries and increasing of pollutant and contaminant resources daily. Increasing of population and reduction of water resources detect importance of waste treatment and reuse of water resources. Studies on treatment of effluents containing heavy metals have showed that adsorption to be a highly effective technique for removing heavy metals from aqueous solutions. The aim of this research was to use of absorbent materials (kaolin clay) to remove Chromium (VI) from the wastewater in discontinuous system According to the results, optimum conditions of Chromium removal were, pH=5, primary concentration of pollutant: 1000(mg/l), fine grained weight of consumed kaolin in constructing concrete: 30%, equilibrium time: 360 minutes, absorbing capacity: 3. 06 mg/g absorbent. The results showed that by using kaolin in the concrete structure as one of the materials used in the mixing design from 5 to 30 percent, the absorption of heavy metal Chromium by concrete samples increased up to 81%. It was observed that increasing the amount of kaolin used in the sample, could decrease the concrete compressive strength. In order to compensate for the reduction of compressive strength and also to increase other mechanical properties of concrete, polypropylene fibers were used which the effect of these fibers on increasing the compressive strength of concrete was Maximum of 7. 8%. Covering the concrete surface with kaolin absorbent can be an innovative and useful solution for increasing the rate of elimination of pollutant and contaminants, cost reduction and accelerating the absorption process. Absorbing capacity of Chromium is 29. 5 mg/g absorbent in this condition respectively. Real waste sample are used for confirming the application of concrete in ordinary conditions of wastewater basin in accordance of optimum conditions of kinetics wastewater. Elimination rates of heavy metal of Chromium were 90. 3% in optimum condition with real samples that has been got from industrial factory. Therefore, it could be concluded that modified concert presents a good potential for treatment of Cr in wastewater. Protecting the structures used in wastewater installations against chemical attacks and reducing maintenance and operation costs is an essential requirement. Usage of kaolin is not only important in terms of removing heavy metals in the wastewater, but also in terms of improving the durability and lifetime of concrete in harsh sewage conditions. Parameters such as short contact time, appropriate range for pH, acceptable absorption capacity, low cost and easy accessibility of the absorbent were the advantages of using kaolin as an adsorbent to remove heavy metals (Chromium) from industial wastewater solution. However, further research should be applied for continuous removal of heavy metal in large-scale. According to the result, mixing kaolin in the concrete could be used to increase the Durability and adsorption efficiency of Chromium.

Cites

Removal of Malachite Green Dye from Industrial Wastewater by Using Concrete Modified with Rubber Powder

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APA: Copy

Asrari, Elham, & Bazrafkan, Mohsen. (2018). Study of possibility using modified concrete with Kaolin absorbent for removeing heavy metal of Chromium (VI) from wastewater. MODARES CIVIL ENGINEERING JOURNAL, 18(6 ), 27-37. SID. https://sid.ir/paper/256715/en

Vancouver: Copy

Asrari Elham, Bazrafkan Mohsen. Study of possibility using modified concrete with Kaolin absorbent for removeing heavy metal of Chromium (VI) from wastewater. MODARES CIVIL ENGINEERING JOURNAL[Internet]. 2018;18(6 ):27-37. Available from: https://sid.ir/paper/256715/en

IEEE: Copy

Elham Asrari, and Mohsen Bazrafkan, “Study of possibility using modified concrete with Kaolin absorbent for removeing heavy metal of Chromium (VI) from wastewater,” MODARES CIVIL ENGINEERING JOURNAL, vol. 18, no. 6 , pp. 27–37, 2018, [Online]. Available: https://sid.ir/paper/256715/en

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