Electrochemical oxidation of landfill leachates at pilot scale: evaluation of energy needs

摘要

Two of the main drawbacks to be overcome before full scale implementation of boron-dopedndiamond electro-oxidation were addressed in this work; its energy consumption and hazardnof formation of chlorinated organics. This was framed within a study in which the technicalnand economic feasibility of BDD electro-oxidation of landfill leachate was evaluated at pilot scale.nOn one hand, its technical feasibility was assessed based on COD and NHtn4 removal, allowingnthe selection of the operation conditions that provide optimal energy efficiency, and specialnattention was paid to the risk of formation of undesired by-products such as nitrite, nitratenions and trihalomethanes. On the other hand, treatment costs were estimated based onnenergy consumption required to reach the disposal limits to natural watercourses establishednby legislation. The results were compared with those of other commonly used AOPs.nUnder the operating conditions studied, the concentration of COD decreased below thendisposal limit (160mgL21) and ammonia concentration reached values as low as 30mgL21.nThe energy consumption needed was estimated at 54 kWh/m3 and the formation ofnchlorination by-products appeared to be low as the maximum total trihalomethanenconcentration detected was 432mg/L.