Sewage disposal . ntly proposed for use at Bridgeport, Conn.),was held to be undesirable on account of cost and danger of nuis-ance. At the 26th Ward plant in Brooklyn, N. Y., the screeningsfrom a Riensch-Wurl installation are composted (mixed with anequal quantity of earth) and spread out on waste land. Intermittent Filtration-Bed Deposits. The suspended matterwhich is deposited on intermittent filtration beds forms into more 412 THE DISPOSAL OF SEWAGE SLUDGE or less of a mat and can be removed from the surface of thebed by raking or scraping (see Fig. 123). In early spring thethickness of th
Sewage disposal . ntly proposed for use at Bridgeport, Conn.),was held to be undesirable on account of cost and danger of nuis-ance. At the 26th Ward plant in Brooklyn, N. Y., the screeningsfrom a Riensch-Wurl installation are composted (mixed with anequal quantity of earth) and spread out on waste land. Intermittent Filtration-Bed Deposits. The suspended matterwhich is deposited on intermittent filtration beds forms into more 412 THE DISPOSAL OF SEWAGE SLUDGE or less of a mat and can be removed from the surface of thebed by raking or scraping (see Fig. 123). In early spring thethickness of this mat may exceed a quarter of an inch, and it canoften be removed from the beds in large sheets. This matconsists largely of organic matter, paper, fat and nitrogenoussubstances. It is easily burned, but unless this is done in adestructor or specially constructed furnace, the odors given offare usually very objectionable. In certain places, as at Brock-ton, Mass., contracts have been made for the removal, free of. Fig. 123. Scraping Intermittent Filtration Beds in Spring, WorcesterSewage Works. cost, of the total scrapings for use by farmers as a this cannot be done, the scrapings may be dug into theground as in the case of grit-chamber detritus. They are usuallyonly slightly putrefactive, though containing a large amount oforganic matter. Ultimate Disposal of Sludge. Some authorities have taken theview that sludge should not be formed at all, but that sewage,after passing through detritus tanks and screens, should bedelivered directly on bacterial beds. This is possible, though by DUMPING OF SLUDGE AT SEA 413 no means always advisable, when bacterial purification is broughtabout on intermittent filtration beds, but when contact beds orpercolating filters are used it is the general practice to removesuspended matter; and consequently sludge-producing tanksform an essential part of most sewage plants. Notwithstanding this fact, much less study has been given to
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