FILTERS READY FOR OPERATION.—A view of the two trickling filters, each 175ft in diameter, which distribute the sewage, after it has been through the primary sedimentation tanks, into and through heavy shingle for further purification before it goes to the secondary sedimentation tanks. The filters are capable of dealing with 54 million gallons a day. The big steel arms revolve slowly to distribute the sewage through the shingle—there are 5000 cubic yards of stone in each filter—and so delicate is the balance that one man can move them and they revolve in a light wind.
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Bibliographic details
Press, Volume XCIX, Issue 29380, 6 December 1960, Page 12
Word Count
95FILTERS READY FOR OPERATION.—A view of the two trickling filters, each 175ft in diameter, which distribute the sewage, after it has been through the primary sedimentation tanks, into and through heavy shingle for further purification before it goes to the secondary sedimentation tanks. The filters are capable of dealing with 54 million gallons a day. The big steel arms revolve slowly to distribute the sewage through the shingle—there are 5000 cubic yards of stone in each filter—and so delicate is the balance that one man can move them and they revolve in a light wind. Press, Volume XCIX, Issue 29380, 6 December 1960, Page 12
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