Evaporation of aged landfill leachate and Fenton oxidation of its condensate
In view of the characteristics of aged landfill leachate such as:high organic loading,strong toxicity,hard biodegradable and so on,a process of evaporation coupled with Fenton oxidation was adopted to effectively degrade organic pollutants in landfill leachate.The concentrations of ammonia nitrogen and organic matters in the leachate evaporation condensate at different initial pH value conditions were investigated.The results showed that,increasing pH value could decrease the COD concentration and increase the ammonia nitrogen concentration of the evaporation condensate;however,with the increasing of the evaporation temperature,the concentrations of COD and ammonia nitrogen of the evaporation condensate decreased.Using Fenton oxidation process to treat landfill leachate evaporation condensate with low organic loading,hard degradable organic pollutants could be further removed.Under the condition that the n(Fe2+)∶n(H2O2)was 1∶2,the dosage of Fe2+was 4-8 mmol/L,the removal rate of COD reached 60％-80％.Besides,it was found that,during the treatment of mixed landfill leachate evaporation condensate with high organic loading using direct oxidation by Fenton method,the phenomenon of wastewater blackening occurred due to the reaction between sulfide and Fe2+,which could be effectively avoided by pretreatment of activated carbon adsorption.The study results showed that,acidic low-temperature evaporation-Fenton oxidation coupling technology is an effective method for fully quantified treatment of aged landfill leachate.
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维普
