Landfill leachates are a problematic wastewater due to their variable concentration, volume changing in time and presence of refractory and hazardous components. In this paper, the results of a new approach to photocatalysis assisted by biological process for the detoxification of stabilised landfill leachate are presented. The biologically pre-treated leachate still contained a significant amount of non-biodegradable COD and TOC amounting to 500 and 200 mg/L, respectively. The 300 min of photocatalytic treatment (UVC/TiO2) brought about a significant decrease in more than 80% refractory organics remaining in leachate. The effect of pH and catalyst loading on mineralisation, colour removal rate and biodegradability (BOD/COD) improvement in the photoreactor were discussed. The bio-accessibility of formed photocatalytic oxidation intermediates was confirmed by oxygen uptake rate (OUR) measurements. Consequently, a part of COD was successfully removed in post-biological treatment.
Leachate detoxification by combination of biological and TiO2-photocatalytic processes
J. Wiszniowski, D. Robert, J. Surmacz-Gorska, K. Miksch, J.-V. Weber; Leachate detoxification by combination of biological and TiO2-photocatalytic processes. Water Sci Technol 1 February 2006; 53 (3): 181–190. doi: https://doi.org/10.2166/wst.2006.091
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