Specification of Henry Bird : treating sewage matters.

  • Bird, Henry.
Date:
1865
Catalogue details

Licence: Public Domain Mark

Credit: Specification of Henry Bird : treating sewage matters. Source: Wellcome Collection.

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    Bird's Improvements in Treating Seivage Matters. then I prefer to apply the dissolved sulphated clay and to mix it intimately with the sewage waters or matters, and then to allow the clay and organic matters to settle or precipitate by reason of the sewage waters or matters being retained in a quiescent or in a comparatively quiescent state for a time in any suitable vessels, or tanks, or cisterns, or reservoirs, but I prefer to allow 5- the sewage water or matters after the sulphated clay has been mixed therewith to flow slowly through any such vessels, or tanks, or cisterns, or reservoirs, so as to allow of the precipitation or deposit of the clay and organic matters taking place. I would here remark that other precipitating agents, such as lime, burned 10 chalk, and others, have before been applied and mixed with sewage waters, and the sewage waters have been allowed to flow slowly through tanks or reservoirs, so as to admit of the precipitation or settlement of the precipitating agents together with organic matters taking place, and I would state that any such arrangements of apparatus may be employed when using sulphated clay 15 as the agent to deodorize the organic matters in sewage waters or waters to fix the ammonia and to precipitate such matters. In treating ordinary sewage waters or matters of towns, I employ at the - rate of about one ounce of sulphated clay to each five cubic feet of sewage waters. If the sewage waters or matters have more organic matters in them 20 than ordinary town sew^age, a greater proportion of sulphated clay should be used, and if the ammonia is not sufficiently fixed, then it is desirable to ^ employ a greater proportion of acid in preparing the sulphated clay. It is preferred when treating large quantities of sewage to employ long settling reservoirs having at intervals transverse partitions so as to divide each 25 reservoir into several compartments, and that in each partition there should be a passage or opening of dimensions suitable for the flow of the requisite quantity of sewage waters at the speed required, in order on the one hand that ample time may be allowed for precipitation, and on the other hand that the requisite quantity of sewage may pass from end to end of a reservoir 30 within the time allowed ; and in order that the matters which rise to the surface and float may not pass aw'ay through the openings or passages in the partitions, such openings should be below the level at which the sewage constantly stands in a reservoir, and such works should be arranged in such manner that the precipitated matters may be continuously removed from the 35 reservoirs, which arrangement is preferable to having two or more sets of settling vessels, or tanks, or reservoirs, from which the precipitated matters are required to be dug out or removed after running off the waters therefrom, but such arrangements may be used if preferred. The precipitated matte:s