Disinfection Byproducts in Drinking Water and Evaluation of Potential Health Risks of Long-Term Exposure in Nigeria

Table 2

Average concentration (μg/L) () of trihalomethanes in raw, primary, and secondary water samples from WTPs obtained between January and May 2015.

Source	TCM	BDCM	DBCM	TBM	TTHMs
Jan.
OWR	BD	BD	BD	BD	0
OWP	997.43	BD	BD	0.40	997.83
OWS	960.68	BD	BD	BD	960.68
LWR	BD	BD	BD	BD	0
LWP	716.04	0.42	0.38	BD	716.84
LWS	825.04	BD	BD	BD	825.04
HWR	BD	BD	BD	BD	0
HWP	755.70	BD	BD	BD	755.70
HWS	812.35	BD	BD	BD	812.35
SWR	BD	BD	BD	BD	0
SWP	999.64	BD	BD	BD	999.64
SWS	950.97	BD	BD	BD	950.97
Feb.
OWR	BD	BD	BD	BD	0
OWP	953.77	BD	BD	BD	953.77
OWS	887.34	BD	BD	BD	887.34
LWR	BD	BD	BD	BD	0
LWP	900.70	0.42	BD	BD	901.12
LWS	825.04	BD	BD	BD	825.04
HWR	BD	BD	BD	BD	0
HWP	916.94	BD	BD	BD	916.94
HWS	872.00	BD	BD	BD	872.00
SWR	BD	BD	BD	BD	0
SWP	906.38	BD	BD	BD	906.38
SWS	712.50	BD	BD	BD	712.50
Mar.
OWR	BD	BD	BD	BD	0
OWP	561.86	BD	BD	BD	561.86
OWS	582.32	0.41	BD	BD	582.73
LWR	BD	BD	BD	BD	0
LWP	620.55	BD	BD	BD	620.55
LWS	846.79	0.41	BD	BD	847.20
HWR	BD	BD	BD	BD	0
HWP	777.70	BD	BD	BD	777.70
HWS	803.42	BD	BD	BD	803.42
SWR	BD	BD	BD	BD	0
SWP	624.54	BD	BD	BD	624.54
SWS	591.99	BD	BD	BD	591.99
Apr.
OWR	BD	BD	BD	BD	0
OWP	31.21	BD	BD	BD	31.21
OWS	28.34	0.41	BD	BD	28.75
LWR	BD	BD	BD	BD	0
LWP	21.92	BD	BD	BD	21.92
LWS	28.44	BD	BD	BD	28.44
HWR	BD	BD	BD	BD	0
HWP	28.25	BD	BD	BD	28.25
HWS	30.03	BD	BD	BD	30.03
SWR	BD	BD	BD	BD	0
SWP	28.87	BD	BD	BD	28.87
SWS	32.11	BD	BD	BD	32.11
May
OWR	BD	BD	BD	BD	0
OWP	30.45	BD	BD	BD	30.45
OWS	34.15	BD	BD	BD	34.15
LWR	BD	BD	BD	BD	0
LWP	27.20	BD	BD	BD	27.20
LWS	26.89	BD	BD	BD	26.89
HWR	BD	BD	BD	BD	0
HWP	32.90	BD	BD	BD	32.90
HWS	29.20	BD	BD	BD	29.20
SWR	BD	BD	BD	BD	0
SWP	32.50	BD	BD	BD	32.50
SWS	32.10	BD	BD	BD	32.10

R: raw, P: primary, S: secondary disinfection samples, and BD: below detection limit.