[Report 1965] / Medical Officer of Health, Birkenhead County Borough.

  • Birkenhead (England). County Borough Council.
Date:
1965
Catalogue details

Licence: Attribution 4.0 International (CC BY 4.0)

Credit: [Report 1965] / Medical Officer of Health, Birkenhead County Borough. Source: Wellcome Collection.

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    Raw Vater Final Vater i Mixed 1 Supply Dee Alwen Ve 11s Dee | Alwen !Veils No. of Examinations 12 26 12 260 104 52 i 234 No, of Colonies on Agar 1 day at 37° C per ml. 3 0 0 0 0 0 No. of Colonies on Agar 3 days at 22° C per ml. - 91 1 0 3 i 1 0 0 Presumptive coli present in 0.01 1 .0 - 1 ! - - Presumptive coli absent from 0.01 - 100ml 100ml 100ml 100ml 100ml Probable No. per 100 ml. 6000 250 0 0 0 0 0 Bact. Coli (Type 1 ) present in 0.01 1 .0 _ _ _ _ — Bact. Coli (Type 1) absent in 0.001 0.1 100ml 100ml 100ml 100ml 100ml Probable No. per 100 ml. 3500 50 0 0 0 0 0 Treatment of the Alwen supply is by pressure filtration followed by sterilisation by chlorine and ammonia. Treatment of the Dee supply is by settlement in upward flow sedimentation tanks followed by rapid gravity filtration and super I chlorination. Treatment of the Veils supply - marginal chlorination only. .] i