| A large reduction in faecal coliforms was observed
in the presettling basin (HRT of 1.4 days) and the ditches
(HRT of 0.8 days). The amount of faecal coliforms decreased
from around 800/ml to on average 10/ml at the end of
the ditches in summer. Disinfection was not consistently
high in winter at this short HRT. Removal of faecal
coliforms was larger in the front than in the rear ditch
sections.
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