Purification of water-carried sewage : data for the guidance of corporations, local boards of health and sanitary authorities / by Henry Robinson and John Charles Melliss.

Date:
1877
Catalogue details

Licence: Public Domain Mark

Credit: Purification of water-carried sewage : data for the guidance of corporations, local boards of health and sanitary authorities / by Henry Robinson and John Charles Melliss. Source: Wellcome Collection.

Provider: This material has been provided by the Royal College of Physicians of Edinburgh. The original may be consulted at the Royal College of Physicians of Edinburgh.

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    inclusive of 5 per cent, interest on capital, and rent, but exclusive of supervision, the annual charge at present amounts to 993/., or at the rate of 12/. 19,$. Hd. per million gallons of sewage, or Is. 7 JcZ. per head of the population. It is proposed to irrigate about 180 acres, thus giving a proportion of 857 acres to a daily flow of 1,000,000 gallons of sewage. Epsom, Surrey, has a population of 6,276. The sewage is purely domestic. The flow amounts to ] 04,000 gallons a day. Subsidence in tanks takes place, the solid matters so deposited are mixed with ashes for a manure, and the liquid sewage Hows partly by gravitation, and is partly pumped to a height of 10 feet, on to a farm of 327 acres, chiefly of gravel formation. The local board has a lease of this farm for twenty-one years, from 1868, and pays an annual rental of 591/. ;l about sixty acres of it are under irrigation. The land is sublet for a e much shorter period, viz., three years, at the annual rental of 516/.;2 so that, with the cost of pumping and dis- tributing the sewage over the land, averaging 290/. a year,3 and 5 per cent, interest on 3,626/.4 capital spent on the necessary works in connection with the pumping station and farm, an annual charge, exclusive of supervision, of 546/. falls upon the rates, or about 14/. 7s. 8d. per million gallons of sewage, or Is. 8%d. per head of the population. This arrangement has been in operation four years. The quantity of land used is in the pro- portion of 577 acres to a daily flow of 1,000,000 gallons of sewage; but it will be observed that the authorities possess land sufficient for a proportion of 3,144 acres to the same quantity. Norwich has a population of 84,000. The sewage 1 Published Accounts of Local Board of Epsom for 1873,1874, and 1875.