Appendix 3.3		Calculation of Odour Emission Factors and Vent Pipe Information
	Temp	=	30	degrees	or	86	F
	ORP	=	50	mV	(for septic sewage)
	A	=	0.5	m	x	surface area of tank
	V	=	5	air change per hour
	Cf	=	0.52	for 5 air changes per hour
	DF	=	1.6 X (T/10) 4.9 X (ORP + 200)-0.59						Oum-3
	E	=	DF X Air Volume of the emission source (m3) x ( V/3600) X Cf						OUS-1
Source ID						DF	E	E
						Oum-3	OUS-1	Oum-2S-1
S2, S3	Sequencing Batch Reactor 1 or 2 or 3
& S4
	L	=	17.2	m
	W	=	5.2	m
	Area	=	89.44	m2		2335.489	75.4311	0.8434
S5	Sludge Holding Tank
	L	=	6.98	m
	W	=	6	m
	Area	=	41.88	m2		2335.489	35.32038	0.8434
S1 & S6	SBR Feed Pump Station & Sludge Dewatering Room
	H2S at inlet				=	10	ppm
	With 99.5% odour removal efficiency				=	0.05	ppm
	With odour unit for H2S				=	0.0005	ppm
	(In accordance with Final EIA Report for Tune Mun Sewerage - Eastern Coastal Sewerage Extension)
	Odour emission at exit of vent pipe				=	100	OUm-3
	Pumping Stations		(P1a, P1b and P2 pumping station)
	H2S at inlet				=	10	ppm
	With 99.5% odour removal efficiency				=	0.05	ppm
	With odour unit for H2S				=	0.0005	ppm
	Odour emission at exit of vent pipe				=	100	OUm-3
Details of the Vent Pipe for Pumping Stations and Sludge Dewatering Room
Pumping Station P1a
Wet well Vol		34.32	m3	Vent Pipe Dia	0.11	m
Screen chamber Vol		21.06	m3	Area	0.009503	m2
Total		55.38	m3	Exit Vel	16.18733	m/s
Pumping Station P1b
Wet well Vol		49.28	m3	Vent Pipe Dia	0.14	m
Screen chamber Vol		33.6	m3	Area	0.015394	m2
Total		82.88	m3	Exit Vel	14.95551	m/s
Pumping Station P2
Wet well Vol		72.07	m3	Vent Pipe Dia	0.16	m
Screen chamber Vol		42.32	m3	Area	0.020106	m2
Total		114.39	m3	Exit Vel	15.80359	m/s
SBR Feed Pump Station
				Vent Pipe Dia	0.3	m
				Area	0.070686	m2
Total		409	m3	Exit Vel	16.07268	m/s
Sludge Dewatering Room
				Vent Pipe Dia	0.3	m
				Area	0.070686	m2
Total		264	m3	Exit Vel	10.37454	m/s