Wipe out of stench from landfill leachate by non-thermal plasma combined with blow-off

A method combined non-thermal plasma and blow-off was employed to wipe out of stench from landfill leachate. A new type of high pulse voltage source with Blumlein pulse forming network(BPFN)was adopted, and all experiments were conducted at a fixed pulse frequency of 100 Hz. The influences of important factors, such as gas flow rate, peak voltage and humidity, on removal efficiency of odors were studied. The results showed that the combined method could wipe efficiently out of stench from landfill leachate. Ammonia was taken as the experimental object since it was the main component of odors from landfill leachate. Higher peak voltages could promote removal efficiency of ammonia while larger flow rates reduced it. The removal efficiency of ammonia in plasma reactor could reach 92.5% after continuous operating 10 min at conditions of: ammonia concentration 520 mg·m^-3, peak voltage 37 kV and flow rate 1000 ml·min^-1. A dynamic model was developed to describe quantitatively the relation between ammonia and energy density and initial concentration. A certain level of humidity in flow gas could enhance oxidation of malodorous gas such as ammonia. In plasma chemistry process, ammonia was removed by direct decomposition by high energy electrons or by reaction with intermediates to form NH₄NO₂ and NH₄NO₃.