Experimental investigations by the State Board of Health of Massachusetts upon the purification of sewage by filtration and by chemical precipitation and upon the intermittent filtration of water. Made at Lawrence, Mass., 1888-1890.

  • Massachusetts. State Board of Health.
Date:
1890
Catalogue details

Licence: Public Domain Mark

Credit: Experimental investigations by the State Board of Health of Massachusetts upon the purification of sewage by filtration and by chemical precipitation and upon the intermittent filtration of water. Made at Lawrence, Mass., 1888-1890. Source: Wellcome Collection.

Provider: This material has been provided by London School of Hygiene & Tropical Medicine Library & Archives Service. The original may be consulted at London School of Hygiene & Tropical Medicine Library & Archives Service.

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    Page Filter Tank No. 15a — Concluded. experiments on the effect of the addition of saltpetre on the number of bacteria in the effluent, 553 filtering material used (large gravel stones), 549 amount of air space in, 549 amount of liquid held by the stones, 549 nitrification, 551 efiect of the addition of acid to sewage on, . . . 552, 553, 080, 687 purification eflccted, 551 purification effected, when sewage was acid, . . . 552, 553, 686, 687 Filter Tank No. 16a : appearance of the efflftent, 566, 569-575, 672 bacteria in effluent, 564, 506, 576, 671 chemical analyses of effluent, 564, 565, 508 575, 671 chemical analyses of effluent and sewage, monthly averages, . . 564 description of, 503, 670 details of experiments in, 503-507, 671 filtering material used (small gravel stones), 563 air space in, 503 nitrification in, 504, 505, 670-672 purification effected, 506, 507, 578, 070-672 not dependent on mechanical straining, 567, 671 effluent compared with some well waters, 672 Filter Tanks Nos. 17a and 19 : chemical analyses of effluent, 688 experiment to determine whether the addition of marble dust has any effect on nitrification, 688 filtering material used (sand intermediate in fineness between Tanks No. I and No. 2, with layers of marble dust in No 17a), . 687, 688 purification effected, 088 quantity of sewage applied, 688, 689 Filter Tank No. 18a (filtering water) : alumina precipitated within the tank, 697 « bacteria, number of, in effluent, 098 chemical analyses of applied water and effluent, monthly aver- ages, 698 color removed by the alumina, 698, 699 description of, 697 deterioration of, 699 filtering material used (coarse sand in which aluminum hydrate had been precipitated), 697 nitrification, 698, 699 nitrogen, reduction of organic, 699 purification effected, 698, 699 quantity filtered in relation to quality of effl^nt, 699 Filter Tank No. 20 (filtering water) : alumina, effect of, in removing color, 651, 652 bacteria, number of, in effluent, 649, 654 bacteria, effect of lime water oil number of, in effluent, .... 654 chemical analyses of effluent and city water applied, . 649, 050, 655-657 clay, effect of, in removing color, 651, 652