Treatment Efficiency by means of a Nonthermal Plasma Combined with Heterogeneous Catalysis of Odoriferous Volatile Organic Compounds Emissions from the Thermal Drying of Landfill Leachates

Table 3

Inlet and outlet concentration ranges and average concentration reduction for each compound family.

Family	Inlet conc. range	Outlet conc. range	Average conc. reduction (%)
	(μg/m^3)	(μg/m^3)
Organic acids^*	3.7–29.5	0.2–3.5	67.7
Alcohols and ethers	32.7–227.7	6.9–33.3	68.0
Aldehydes	2.1–232.8	0.5–5.5	65.3
Ketones	20.5–143.5	2.7–34.6	69.0
Esters	0.4–2.1	0.1–1.0	44.7
Pyrazines and pyridines	2.2–54.3	0.2–24.1	54.2
Sulphur compounds	1.3–5.5	n.d. <0.1	95.3
Other	1.0–10.6	0.2–2.2	64.5

Excluding acetic acid, that had higher outlet than inlet levels, possibly due to new formation.