Title: Optimisation of anaerobic stabilised leachate treatment using catalytic ozonation with zirconium tetrachloride

Authors: Siti Nor Farhana Zakaria; Hamidi Abdul Aziz; Salem S. Abu Amr; Yung-Tse Hung

Addresses: School of Civil Engineering, Engineering Campus, Universiti Sains Malaysia, 14300 Nibong Tebal, Penang, Malaysia ' School of Civil Engineering, Engineering Campus, Universiti Sains Malaysia, 14300 Nibong Tebal, Penang, Malaysia; Solid Waste Management Cluster, Engineering Campus, Universiti Sains Malaysia, 14300 Nibong Tebal, Penang, Malaysia ' Malaysian Institute of Chemical and Bioengineering Technology (MICET), Universiti Kuala Lumpur (UniKl), Melaka, Malaysia ' Department of Civil and Environmental Engineering, Cleveland State University, Cleveland, Ohio 44115, USA

Abstract: The current study aimed to assess the performance of utilise Zirconium reagent during ozonation of anaerobic stabilised leachate. In this study, quadratic models using response surface methodology software was utilised to design the experiments and evaluate the interaction between experimental factors, such as zirconium tetrachloride, pH, and reaction time, at constant ozone dosage (27 g/m³). The performance of the new ozonation method was evaluated in terms of the removal of the chemical oxygen demand (COD), NH₃-N and colour. The obtained quadratic models for colour, NH₃-N and COD removal was considered significant (P < 0.0001). The optimal removal for of 100%, 90%, and 66% for colour, COD and NH₃-N, was obtained at 38 min reaction time, ZrCl₄ dosage (1/2(COD/ZrCl₄ g/g) and pH 4.5, using 27g/m³ ozone dosage, respectively. The results obtained in this study were compared with zirconium only and ozone only, to evaluate its effectiveness. The performance of the new oxidation method (O₃/ZrCl₄) better than other related methods for the removal of colour, COD and NH₃-N.

Keywords: zirconium tetrachloride; ZrCl₄; ozonation; advanced oxidation process; landfill leachate.

DOI: 10.1504/IJEWM.2018.092717

International Journal of Environment and Waste Management, 2018 Vol.21 No.2/3, pp.102 - 119

Received: 15 Jun 2017
Accepted: 12 Feb 2018
Published online: 28 Jun 2018 *

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