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Removal of Various Pollutants from Leachate Using a Low-Cost Technique: Integration of Electrolysis with Activated Carbon Contactor

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Abstract

Landfill leachate contains a high concentration of organic pollutants that are active agents in water pollution. This study was conducted to remove various pollutants from landfill leachate through electrolysis and activated carbon (AC) treatments. A simple electrolytic reactor was designed to investigate the removal efficiency of these treatments for biochemical oxygen demand (BOD), chemical oxygen demand (COD), total suspended solids (TSSs), and total dissolved solids (TDSs) from landfill leachate at different electric current densities (CDs) and retention times (RTs). The results showed that the highest removal efficiencies for BOD and COD were 75.6 and 57 %, respectively, under a 7-V current for 4 h. It was also found that BOD, COD, TSS, and TDS removal efficiencies improved in proportion to an increase in CD and RT. However, pH gradually increased with an increase in CD and RT. A number of treated leachate samples were further polished by AC filtration to compare the effect of this additional process on the removal of color, BOD, COD, TSS, and TDS. This secondary treatment resulted in a higher removal of color and other pollutants than electrolysis alone. At 4 h RT, the BOD removal efficiency was 54.6 % at 3 V and 66.4 % at 5 V, and the efficiency increased to 61.5 and 70.5 %, respectively, after treatment by AC filtration. Under the same conditions, COD removal efficiency increased from 7.5 to 38.5 % at 3 V and from 31.1 to 49.5 % at 5 V. TSS and TDS removal efficiencies were also significantly improved by AC filtration. It is therefore concluded that 7 V of CD and 4 h of RT are the optimum parameters for removing pollutants from leachate and that the secondary treatment of AC filtration is an efficient method of further polishing.

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Acknowledgment

The financial support provided by UPM under RUGS, 05-02-12-1874RU, 9,344,400 is acknowledged. Authors gratefully acknowledge Prof. Thamer, Dr. Nik NND and students who supported this study.

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Authors and Affiliations

  1. Department of Civil Engineering, University Putra Malaysia, UPM, 43400, Serdang, Selangor, Malaysia

    Amimul Ahsan, Masksedah Kamaludin & S Idrus

  2. Institute of Advanced Technology, University Putra Malaysia, UPM, 43400, Serdang, Selangor, Malaysia

    Amimul Ahsan

  3. Department of Animal Science, Bangladesh Agricultural University, Mymensingh, 2202, Bangladesh

    M. M. Rahman

  4. Department of Civil Engineering, Curtin University, Perth, Australia

    A. H. M. F. Anwar

  5. Faculty of Engineering, Tanta University, Tanta, Egypt

    M. A. Bek

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  1. Amimul Ahsan
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  2. Masksedah Kamaludin
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  4. A. H. M. F. Anwar
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Correspondence to Amimul Ahsan.

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Ahsan, A., Kamaludin, M., Rahman, M.M. et al. Removal of Various Pollutants from Leachate Using a Low-Cost Technique: Integration of Electrolysis with Activated Carbon Contactor. Water Air Soil Pollut 225, 2163 (2014). https://doi.org/10.1007/s11270-014-2163-y

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  • DOI: https://doi.org/10.1007/s11270-014-2163-y

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