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...
Biosolids are a by-product of municipal wastewater treatment. They contain organic matter and nutrients that are beneficial for soil, crop, and livestock productivity. Raw sewage solids must be processed to meet U.S. Environmental Protection Agency (USEPA) standards before they
can be called biosolids. This publication focuses on how biosolids can...
Predicting agronomic rates is important to derive optimum economic and environmental benefits from biosolids fertilizer applications. We conducted this research to 1) evaluate dryland wheat response to biosolids applications over a range of climate zones in the Pacific Northwest and 2) compare agronomic application rates predicted from yield curves with...
Published June 1992. Reprinted April 1994. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog
A study of the effect of elevated pressure on the activated
sludge waste treatment process is presented. The method of study
involved a comparison of two laboratory, batch type, activated sludge
units. One unit was operated at atmospheric pressure as a base control
and the other operated at elevated pressures...
The purification capacity of an activated sludge process is highly
dependent of the rate of oxygen transfer from the air to the microorganisms.
This rate can be increased in an air diffusion system by
subjecting the culture to high shear and high pressure.
A study of the effects of high...
Fluorinated alkyl substances, which can be persistent, toxic, and
bioaccumulative, have been quantitated in many densely populated and
remote regions, including in air, surface waters, groundwater, and biota;
however, little is known about their transport or behavior in the environment.
Wastewater effluent is one of the principal routes for introducing...