View of water filtration bed showing mats of algae

View of water filtration bed showing mats of algae

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Credit: DR JEREMY BURGESS/SCIENCE PHOTO LIBRARY

Caption: Water treatment. Sand filtration lagoon at a water treatment works, covered with floating mats of the green alga Cladophora. The excessive algal growth indicates contamination by nitrates & phosphates from agricultural fertilisers. The water undergoes initial cleaning in sedimentation tanks before being pumped into the filtration lagoons. The bed of the lagoon is a thick layer of sand containing hosts of water fleas & protozoa which consume the algae in the water. The water filters down through the sand & is then chlorinated & fed into the mains supply. Photo taken at Ormesby water works, Norfolk, which supplies the Great Yarmouth area with drinking water taken from the Norfolk Broads.

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Keywords: algal bloom, cladophora, cladophora sp., east anglian water works, filtration bed, green algae, ormesby water treatment works, water industry, water treatment works

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