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acre daily applied sewage April 22 atile August 16 average results cent chemical precipitation tanks clogged coke strainers Columbus sewage composition crude sewage cubic centimeter cubic yards December Degree of Purification depth dissolved effect efficiency February February 18 feet filtering material following table free ammonia gallons per acre grit chamber inches influents and effluents intercepting sewer intermittent sand filters January June 27 June 30 layer million gallons months niters nitrification Nitrogen November numbers of bacteria obtained OOO'OOE OOO'OOI'I organic matter orifice Percentage Removal Percentages of Removal period of flow Period of Operation pipe plain sedimentation Plain Settling Tank preparatory treatment Primary Contact Filter putrescible rates of treatment received the effluent removal of suspended Removal Referred results of analyses samples Scioto River screen septic action septic tanks sludge deposit sprinkling filters sulphate surface suspended matter Total Number underdrains wet sludge
Page 334 - ... November, 1905, were as follows: "1. Preliminary clarification of the sewage in basins holding on an average about an 8-hour flow, and operated on the basis of the septic treatment. 2. Purification of the septic effluent to a non-putrescible state by sprinkling filters at an average net rate of 2,000,000 gallons per acre daily. 3. Final clarification of the effluent of the sprinkling filters in basins holding an average flow of about two hours. This process produces a non-putrescible effluent...
Page 76 - The apparatus used in measuring the deposit in a septic tank while in operation consisted of a glass tube 2.5 feet long and 0.5 inch in diameter, open at both ends and fastened parallel to the side of a wooden rod 12 feet long. Through the glass tube a fine wire was drawn, at the lower end of which was fastened a flexible rubber stopper, the smaller end uppermost. The wire extended up through the glass tube to the top of the wooden pole being guided here and there by screw-eyes. In making a measurement...
Page 229 - Institute in the department of chemistry, and for some years assistant at the Lawrence experiment station of the Massachusetts State board of health, as research chemist and bacteriologist.
Page 110 - ... sewage, and after subsidence for a period of time sufficient for the removal of the economical percentage of the suspended matter in the day sewage, the residual amount of suspended matter in the weak sewage is less than that in the strong sewage, although the removal is much less.
Page 33 - ... sewage per capita. . 131 106 64 101 94 88 89 137 TABLE 10. — COMPARISON OF THE PERCENTAGES WHICH THE FLOW OF SEWAGE AND THE AMOUNT OF ITS DIFFERENT CONSTITUENTS AT DIFFERENT HOURS ARE OF THE AVERAGE FOR THE DAY TABLE 11. — COMPARISON OF THE PERCENTAGES WHICH THE FLOW...
Page 23 - ... survived pasteurization and which grew with difficulty on certain media. Because of the new State law requiring the use of approved pipettes for bacteriological control work, a study is being made with the Dairy Division of the various types of pipettes now in use, with the idea of recommending standards to the Committee on Standard Methods of the American Public Health Association. Studies of the Coccaca.
Page 101 - January, and was of 37.71 days' duration. The average period between obligatory cleanings of Plain Settling Tank A, from August 16, 1904, to June 30, 1905, was 19.13 days. In the case of Plain Settling Tank B, which was operated from November 24, 1904, to April 18, 1905, the average period between obligatory cleanings amounted to 20.46 days.
Page 34 - QUANTITIES OF PRINCIPAL CONSTITUENTS IN GRAMS PER CAPITA DAILY OF THE SEWAGE OF VARIOUS CITIES.
Page 76 - ... flexible rubber stopper, the smaller end uppermost. The wire extended up through the glass tube to the top of the wooden pole being guided here and there by screw-eyes. In making a measurement the rod was lowered into the liquid in the tank, and slowly inserted into the deposit on the bottom. After a sufficient time had been allowed for displacement in the tube the wire was pulled, drawing the rubber stopper into the lower end of the glass tube. The rod was drawn up, and the depth of the sludge...