A comparative treatment of stabilized landfill leachate: coagulation and activated carbon adsorption vs. electrochemical oxidation.
This work investigated the treatment of a landfill leachate that had previously undergone biological treatment. Two treatment schemes were compared: the first one involved coagulation followed by activated carbon adsorption, whilst the second was electrochemical treatment. Coagulation with alum resulted in a 50% removal of chemical oxygen demand (COD). The optimum aluminium dose was 3 mM Al3+. Activated carbon adsorption of stabilized leachate that had been previously treated by coagulation resulted in an overall 80% removal of COD. However, a significant part of the organic matter (corresponding to 170 mg/L) was non-adsorbable. Electrochemical oxidation over a boron-doped diamond electrode led to about 90% COD removal in 240 min with the resulting stream having a COD content as low as 50 mg/L. An increase in current intensity from 15 A to 21 A had no practical effect on the overall COD removal, which followed first-order kinetics.
Papastavrou
Chrystalla
C
Department of Environmental Engineering, Technical, University of Crete, GR-73100 Chania, Greece.
Mantzavinos
Dionissios
D
Diamadopoulos
Evan
E
D002606:Charcoal / Q000737:chemistry*; D004563:Electrochemistry / Q000379:methods*; D005374:Filtration / Q000379:methods*; D009930:Organic Chemicals / Q000737:chemistry / Q000302:isolation & purification*; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000737:chemistry* / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods*
D009930:Organic Chemicals; D014874:Water Pollutants, Chemical; D002606:Charcoal