Drinking water treatment efficiency

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How efficient is microbiological treatment (reported as log-decrease) as used in most common Finnish water treatment processes?


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Microbiological cleansing as log-decrese
Water treatment method Pathogen
Campylobacteri E.coli O157:H7 Rotavirus Norovirus Cryptosporidium Giardia
Traditional cleaning [1]
Well working cleaning [1]
Enhanced cleaning [2]
Slow sand filtration [1]
Limestone filtration 0 0 0 0 0 0
Active carbon filtration 0 0 0 0 [3] [3]

Water treatment processes

Coagulation works well
Enhanced coagulation
Sand filtration
Limestone filtration
Active carbon filtration
Drinking water treatment efficiency(log-decrease)
1Traditional cleaningcampylobacterLogdecrease2.1
2Traditional cleaningE.coli O157:H7Logdecrease2.1
3Traditional cleaningrotavirusLogdecrease3
4Traditional cleaningnorovirusLogdecrease3
5Traditional cleaningcryptosporidiumLogdecrease3.2
6Traditional cleaninggiardiaLogdecrease3.4
7Well working cleaningcampylobacterLogdecrease1
8Well working cleaningE.coli O157:H7Logdecrease1
9Well working cleaningrotavirusLogdecrease1.2
10Well working cleaningnorovirusLogdecrease1.2
11Well working cleaningcryptosporidiumLogdecrease1.4
12Well working cleaninggiardiaLogdecrease2.1
13Enhanced cleaningcampylobacterLogdecrease3
14Enhanced cleaningE.coli O157:H7Logdecrease3
15Enhanced cleaningrotavirusLogdecrease4
16Enhanced cleaningnorovirusLogdecrease4
17Enhanced cleaningcryptosporidiumLogdecrease4.2
18Enhanced cleaninggiardiaLogdecrease4.4
19Slow sand filtrationcampylobacterLogdecrease2.7
20Slow sand filtrationE.coli O157:H7Logdecrease2.7
21Slow sand filtrationrotavirusLogdecrease2.2
22Slow sand filtrationnorovirusLogdecrease2.2
23Slow sand filtrationcryptosporidiumLogdecrease4.8
24Slow sand filtrationgiardiaLogdecrease4.9
25Limestone filtrationcampylobacterLogdecrease0
26Limestone filtrationE.coli O157:H7Logdecrease0
27Limestone filtrationrotavirusLogdecrease0
28Limestone filtrationnorovirusLogdecrease0
29Limestone filtrationcryptosporidiumLogdecrease0
30Limestone filtrationgiardiaLogdecrease0
31Active carbon filtrationcampylobacterLogdecrease0
32Active carbon filtrationE.coli O157:H7Logdecrease0
33Active carbon filtrationrotavirusLogdecrease0
34Active carbon filtrationnorovirusLogdecrease0
35Active carbon filtrationcryptosporidiumLogdecrease1.1
36Active carbon filtrationgiardiaLogdecrease2
38NoneE.coli O157:H7Logdecrease0


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See also


  1. 1.0 1.1 1.2 Hijnen, W. A. and Medema, G. (2007). Elimination of micro‐organisms by water treatment processes, KWR Watercycle Research Institute.
  2. Abbaszadegan, M., Mayer, B. K., Ryu, H. and Nwachuku, N. (2007). "Efficacy of removal of CCL viruses under enhanced coagulation conditions." Environ Sci Technol 41(3): 971‐7.
  3. 3.0 3.1 Hijnen, W. A., Suylen, G. M. H., Bahlman, J. A., Brouwer‐Hanzens, A. and Medema, G. J. (2010). "GAC adsorption filters as barriers for viruses, bacteria and protozoan (oo)cysts in water treatment." Water research 44: 1224‐123
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