Attenuation of Heavy Metals from Runoff Using Coconut Husk Adsorbent in Porous Asphalt Pavement

Abstract:

In this study, a laboratory model of porous asphalt pavement was developed and tested to evaluate the performance of reducing heavy metals from the artificial stormwater runoff, which corresponded to the rainfall intensity of a subtropical monsoon climate like Bangladesh. In addition to the conventional pavement layers such as surface, base, sub-base and subgrade layers, three additional layers such as a heavy metal adsorbent layer made of locally available coconut husk, sand layer, and geotextiles were placed in the model. The pavement strength and the flow values were measured to confirm the ability of the pavement to sustain medium traffic load. Artificial stormwater was prepared by mixing standard solutions of Pb, Cr, Zn, and Cu with tap waters. Uniform artificial rainfall intensity of 0.3 L/min equivalent to a rainfall intensity of 200 mm/hour was used that infiltrated through the pavement cross section for nearly 2.50 hours. Comparing with the initial concentrations of artificial stormwater, the concentrations of heavy metals such as Pb, Cr, Zn, Cu were reduced up to 87%, 42%, 73%, and 46%, respectively below the coconut husk layer, which indicated the better ability of reducing heavy metal by surface and coconut husk layers. Overall, Pb, Cr, Zn and Cu in the bottom of the pavement layers were reduced by 89%, 56%, 98%, and 67%, respectively. So, the developed porous asphalt pavement can be adopted as an alternative to conventional pavement after further extensive in-situ investigation at various sites.

• Periodical: Advanced Engineering Forum (Volume 37)
• Pages: 47-58
• DOI: https://doi.org/10.4028/www.scientific.net/AEF.37.47
• Online since: September 2020
• Authors: Kalimur Rahman, Saurav Barua*, Pronab Biswas, Md. Shakhaout Hossain
• Keywords: Attenuation of Heavy Metals, Coconut Husk, Heavy Metal Adsorbent, Porous Asphalt Pavement, Stormwater Runoff

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