Water Science & Technology: Water Supply Vol 1 No 1 pp 43–50 © IWA Publishing 2001
Longterm experience in the use of polymeric coagulants at Umgeni Water
DJ Nozaic*, SD Freese** and P Thompson***
*
Umgeni Water, P O Box 9, Pietermaritzburg, 3200, South Africa
**
Umgeni Water, P O Box 9, Pietermaritzburg, 3200, South Africa
***
Umgeni Water, P O Box 9, Pietermaritzburg, 3200, South Africa
ABSTRACT
Umgeni Water, the bulk treatment authority for the cities of Durban and
Pietermaritzburg changed from inorganic coagulants to synthetic polymeric
coagulants at its various works in the mid 1980s. The advantages and
disadvantages experienced with the new chemicals are discussed in detail
in the paper and the changes to test procedures necessary are highlighted.
The polymeric coagulants were found to produce good quality water in line
with international norms but their unsuitability for enhanced coagulation
may preclude their use on some of the works where organic enrichment is
becoming a problem.
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