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acid activated carbon activated sludge aerated lagoon aeration Association AWWA basin biological capacity carbon centrifuge chemical chlorine City coagulation construction Consulting Engineers Water Corp corrosion cost DATA free Dept dewatering DIAL FOR DATA diam digester discharge Disposal Drainage ductile iron effluent elutriation Environmental equipment Facts Circle federal filter filtration flocculation flow handling Industrial Waste installation Johns-Manville lagoon Lake lime maintenance Manager ment meter million monitoring municipal operation organic oxygen ozone phosphorus polymer pond pressure primary problems Reader Inquiry Card reduced removal sanitary sewage treatment sewer Sewerage standards suspended solids tank tion treat treatment facilities unit utility valves waste treatment WASTES ENGINEERING wastewater treatment WATER AND WASTES water meters Water Pollution Water Pollution Control water quality Water Resources water treatment York