Leachate detoxification by combination of biological and TiO2-photocatalytic processes.
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.
Wiszniowski
J
J
The Environmental Biotechnology Department, Silesian University of Technology, Akademicka 2, 44-100 Gliwice, Poland. jaroslaw.wiszniowski@polsl.pl
Robert
D
D
Surmacz-Gorska
J
J
Miksch
K
K
Weber
J V
JV
D001673:Biodegradation, Environmental; D002384:Catalysis; D007700:Kinetics; D008903:Minerals; D010777:Photochemistry; D012996:Solutions; D014025:Titanium / Q000737:chemistry*; D014865:Waste Disposal, Fluid / Q000295:instrumentation* / Q000379:methods*
D008903:Minerals; D012996:Solutions; C009495:titanium dioxide; D014025:Titanium