. The Street railway journal . densersto the filter plant. The discharge from these pumps is an 8-in. pipe, whichis controlled by a butterfly valve, and has its outlet in asedimentation basin. 24 ft. x 33 ft. in plan and 17 ft. deep,within the filter building. When necessary, sulphate ofalumina is applied to the raw water to assist in the removalof impurities. A sedimentation period of one and one-half hours is provided in the basin when the plant is oper-ating at full capacity, and the basin is provided with baffles,so the coagulant has an opportunity to become flocculent and to mix well with
. The Street railway journal . densersto the filter plant. The discharge from these pumps is an 8-in. pipe, whichis controlled by a butterfly valve, and has its outlet in asedimentation basin. 24 ft. x 33 ft. in plan and 17 ft. deep,within the filter building. When necessary, sulphate ofalumina is applied to the raw water to assist in the removalof impurities. A sedimentation period of one and one-half hours is provided in the basin when the plant is oper-ating at full capacity, and the basin is provided with baffles,so the coagulant has an opportunity to become flocculent and to mix well with the water. The plant contains fourniter beds, which are each 10 ft. x 13 ft. in plan, and havea combined capacity of 1200 gals, per minute. The filterscontain 8 ins. of gravel, in three sizes, at the bottom, andthen 28 ins. of sand. They are equipped with the usualstrainer drainage and air wash systems. A 6-in Law-rence centrifugal pump, operated by a 20-hp motor, pro-vides water for washing the filters, and an 8 in. x fritz • 1
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
