Sewage disposal . d illustrate on a practical scale theenormous volumes of the oxidizing agent needed. He estimates(Dibdin, 1904) that 2000 tons of oxygen are absorbed by the riverbetween Teddington and Southend in this process. The pro-portion of dissolved oxygen expressed as per cent of satu-ration, at various points along the river on the high tide, isplotted in the diagram on page 41 by Winslow and Phelps (1906)from figures given by Dibdin (1904) for 1893-94. As the riverenters the city between Kew and Battersea its oxygen contentfalls from 70 per cent to 43 per cent, and the progressive p
Sewage disposal . d illustrate on a practical scale theenormous volumes of the oxidizing agent needed. He estimates(Dibdin, 1904) that 2000 tons of oxygen are absorbed by the riverbetween Teddington and Southend in this process. The pro-portion of dissolved oxygen expressed as per cent of satu-ration, at various points along the river on the high tide, isplotted in the diagram on page 41 by Winslow and Phelps (1906)from figures given by Dibdin (1904) for 1893-94. As the riverenters the city between Kew and Battersea its oxygen contentfalls from 70 per cent to 43 per cent, and the progressive pollutioncontinues until at Woolwich the oxygen value is only one-fifth CONSUMPTION OF OXYGEN BY POLLUTED WATERS 41 that of saturation. Below Barking Creek the heavy pollutionceases, absorption of oxygen overbalances its consumption, andthe normal conditions are gradually restored. The ratio of oxy-gen to nitrogen, which changes from 1 2 at Kingston, aboveLondon, to 1: 62 at Greenwich, is most significant. The same. Fig. 5. Dissolved Oxygen Changes in the Thames at London. general relations are shown in Table XII, quoted by the Con-necticut State Sewage Commission (1899). Sometimes the progressive change in oxygen on the one handand in oxidizable organic matter on the other hand may accu-rately record even very slight changes in the physical conditionsof the process. A good example of this is the diagram repro-duced on page 42 from data collected by Woodman, Winslow and 42 DISPOSAL OF SEWAGE BY DILUTION TABLE XII DISSOLVED GASES IN THE THAMES ABOVE AND BELOW LONDON, ENGLAND(CONNECTICUT, 1899)Analyses by Roscoe and Schorlemmer. (Cubic centimeters per liter.) Total volume of gas Carbon dioxide Oxygen Nitrogen Ratio of oxygen to nitrogen King-ston. :2 Ham-mer-smith. 1 SomersetHouse. Green-wich. :62 Wool-wich. Erith. 6 1 :8. Hansen (1902). The Sudbury River is heavily pollu
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