History of Sanitation
Forfatter: J. J. Cosgrove
År: 1910
Forlag: Standard Sanitary Mfg. Co
Sted: Pittsburgh U.S.A
Sider: 124
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HISTORY OF SANITATION
115
which rapidly changed excrementatious matter into a
homogeneous fluid, only slightly turbid, and holding the
solid matters in suspension in the form of scarcely visible
filaments. The principle claimed for his automatic scaven-
ger by Mouras was that animal dejecta within themselves
contained all the principles of fermentation necessary to
liquefy them.
The teachings of Dr. Mueller and Mouras went un-
heeded for a long time, on account of the chemical processes
then in vogue. It was maintained by those who were sup-
posed to know, that lime and other antiseptic substances
were particularly valuable in sewage purification, because
they destroyed living organisms, such as bacteria, which give
rise to putrefaction and fermentation. They contended
that if all the organisms could be destroyed, that sewage
would be rendered unobjectionable. So conditions stood
when in January, 1887, Mr. Dibden read a paper before the
Institute of Civil Engineers, in which he pointed out that
the very essence of sewage purification was not the destruc-
tion of bacterial life, but the resolution of organic matter
into other combinations by the agency of the micro-organ-
isms. He pointed out, further, that a septic and not an
antiseptic action was what was wanted, consequently any
process which arrested the activity of the bacteria was the
reverse of what was desired. Dibden’s paper had the effect
of turning investigation in the right direction, but a world
of experimenting- on a practical scale would be necessary
before the practice of sewage purification could be estab-
lished on a safe, sound and scientific footing. It remained
for the Massachusetts State Board of Health to conduct
those investigations, and so thoroughly was it accomplished
that the records of their experiments furnish the basis for
sewage purification practice in the United States. The
experiments have been carried on since 1887, and the
thoroughness and value of these investigations can be judged
by the fact that during one period of twenty-two months
four thousand chemical examinations were made in addition
to the microscopic examinations.