The colicidal efficiency of chlorine in both settled and unsettled
trickling filter effluent samples was determined by means of a series
of tests in which each sample was analyzed, at given time intervals,
for suspended solids, pH, residual chlorine (orthotolidine and
iodometric) and coliform count. A dye-tracer study, using Rhodamine...
Currently, the Port of Portland is developing a 9, 410 acre area
at the confluence of the Columbia and Willamette Rivers in Multnomah
County, Oregon. This area will be developed for industrial, commercial,
and recreational use. The recreational development in the
North Portland Peninsula area, including the Rivergate Industrial
District,...
The purpose of this study was to determine the possible problem areas in families with a diet-treated phenylketonuric child. Phenylketonuria is an inborn error of metabolism, which in the past caused mental retardation as well as behavioral disturbances. Initially the discovery of diet therapy eliminated the behavioral disturbances, but not...
Since the development of the activated sludge process in 1913
many attempts have been made to improve it. One approach has been
to increase the oxygen available to the bio-mass. This study combined the use of elevated pressure and high-shear mixing to increase
the oxygen transfer.
The conventional method of...
Adolescent pregnancy is a serious problem which creates social and
emotional consequences for 1 in 10 teenaged girls and their families.
Although the severity of the problem has been well documented in the
literature, few empirical investigations have been conducted to expand
information or to aid in the understanding of...
Storage of water for water quality control is one of the alternative
means of achieving water quality objectives. Authorities in
the field of water quality management disagree regarding the use of
precious water for the dilution of wastes.
The costs of achieving water quality objectives by treatment
of wastes at...
One of the major items in any program of municipal sanitation is the double problem of water supply and waste water disposal. Since streams are the general source of water supply and also the final receptacle for sewage, this dual use of the stream often leads to complications. Sewage and...
The author presents a "state of the art" of the use of polymers
for better settling in domestic waste treatment and evaluates the
published research in the field.
Polymers have only recently been used to obtain better settling
in domestic waste treatment. Due to the number of polymer types
available...
Oils, greases, and grit which collect on an aircraft during
flight are removed on the U. S. Air Force washracks using an
alkaline, water-base cleaner. Waste-flows from these washracks
may include in addition to free oils, emulsified oils, and alkaline,
water-base cleaners several other constituents such as acid skin
brightners,...