Unformatted text preview: cell mass) by biofilm growing on media 4. ON AIR QUALITY ENGINEERING (a) Reduce emissions of precursors: NO x and VOC (b) SO 2 , PM (c) Thermal NO x : N from N 2 , formed at high T; fuel NO x : N from fuel, formation insensitive to T (d) Ash is nnoncombustible, from impurities in fuel. Diesel PM is carbonaceous, formed by incomplete combustion. It is known as soot. (e) Reaction triggered by absorption of a photon, e.g. NO 2 + h ν → NO + O• (f) (i) Avoid use; (ii) replace fireplace with airtight, low emitting wood-burning stove (g) (i) Fuel reformulation (oxygenate addition); (ii) catalytic converters on exhaust (h) (i) Fuel reformulation (reduce S content); (ii) diesel particle traps on exhaust 5. DRINKING WATER DISINFECTION (a) k = 11.5 min-1 (b) 99.999% (5-9’s removal) (c) 99.8% 6. ETS CONTROL BY AIR FILTRATION (a) C* = 29.1 µg m-3 ; τ = 117 min (b) C* = 28.6 µg m-3 ; τ = 73 min...
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- Spring '09
- τ, Catalytic converter, Environmental Engineering, Water Quality Engineering, Air Quality Engineering, DRINKING WATER DISINFECTION