Six wastewater treatment plants (WWTPs) were investigated to evaluate the occurrence and removal of N-nitrosodimethylamine (NDMA), NDMA formation potential (FP) and four specific NDMA precursors, dimethylamine (DMA), trimethylamine (TMA), dimethylformamide (DMFA) and dimethylaminobenzene (DMAB). DMA and tertiary amines with DMA functional group commonly existed in municipal wastewater. Chemically enhanced primary process (CEPP) had no effect on removal of either NDMA or NDMA FP. In WWTPs with secondary treatment processes, considerable variability was observed in the removal of NDMA (19%–85%) and NDMA FP (16%–76%), moreover, there was no definite relationship between the removal of NDMA and NDMA FP. DMA was well removed in all the six surveyed WWTPs; its removal efficiency was greater than 97%. For the removal of tertiary amines, biologic treatment processes with nitrification and denitrification had better removal efficiency than conventional activated sludge process. The best removal efficiencies for TMA, DMFA and DMAB were 95%, 68% and 72%, respectively. CEPP could remove 73% of TMA, 23% of DMFA and 36% of DMAB. After UV disinfection, only 17% of NDMA was removed due to low dosage of UV was applied in WWTP. Although chlorination could reduce NDMA precursors, NDMA concentration was actually increased after chlorination.
. [J]. Frontiers of Environmental Science & Engineering, 2014, 8(4): 519-530.
Lin WANG, Yongmei LI, Xiaoling SHANG, Jing SHEN. Occurrence and removal of N-nitrosodimethylamine and its precursors in wastewater treatment plants in and around Shanghai. Front. Environ. Sci. Eng., 2014, 8(4): 519-530.
typical concentration of NDMA in residential community sewage (Shanghai, China)
Krauss et al. [27]
157, 473
2
background level of NDMA in wastewater (Switzerland)
Chung et al. [33]
149 ± 78b) 1,188 ± 728b)
20 20
inhibitory effect of diet on formation of NDMA in humans, group with lowest and highest level given (Korea)
Levallois et al. [34]
<9c)
59
rural Canada
Abdel Mohsen et al. [35]
1,800 ± 746c)
11
effect of bladder infections or cancer, here only control group given (Egypt)
Vermeer et al. [36]
241 ± 123c) 1,063 ± 687c)
25 25
inhibitory effect of diet on formation of NDMA in humans, group with lowest and highest level given (The Netherlands)
van Maanen et al. [37]
78 ± 68c)
22
nitrate level in tap water (The Netherlands)
Mostafa et al. [38]
169 ± 294c)
27
effect of bladder infections, here only control group given (Egypt)
Tab.2
WWTP ID
GSa)
PCb)
AnaTc)
AnoTd)
ATe)
SCf)
A
8,037 ± 579
8,749 ± 712
NAg)
NA
NA
NA
B
NA
8,869 ± 667
NA
NA
1,874 ± 198
2,086 ± 154
C
NA
1,524 ± 139
NA
1,475 ± 116
1,358 ± 107
1,284 ± 126
D
NA
1,914 ± 203
1,876 ± 169
1,318 ± 124
1,295 ± 99
1,296 ± 106
E
5,796 ± 473
NA
4,492 ± 395
4,007 ± 268
2,433 ± 174
2,467 ± 198
F
NA
1709 ± 132
1,596 ± 115
1,398 ± 106
1,043 ± 84
909 ± 76
Tab.3
Fig.1
NDMA and its precursors
before UV in WWTP C
after UV in WWTP C
before UV in WWTP D
after UV in WWTP D
before chlorination in WWTP E
after chlorination in WWTP E
NDMA /(ng·L−1)
82 ± 8
68 ± 9
101 ± 8
84 ± 7
1,161 ± 89
1,546 ± 134
NDMA FP /(ng·L−1)
1,208 ± 89
1,199 ± 102
1,296 ± 106
1,282 ± 97
2,467 ± 198
1,984 ± 173
DMA/(μg·L−1)
44 ± 3
41 ± 2
30 ± 2
29 ± 1
60 ± 4
15 ± 2
TMA/(μg·L−1)
103 ± 8
101 ± 5
63 ± 3
60 ± 4
145 ± 7
112 ± 4
DMFA/(μg·L−1)
856 ± 75
837 ± 61
801 ± 78
785 ± 66
2,207 ± 134
1,932 ± 121
DMAB/(μg·L−1)
163 ± 17
158 ± 13
376 ± 21
371 ± 18
288 ± 32
209 ± 25
Tab.4
Fig.2
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