Now showing items 1-10 of 19
The roles and interactions of cations, proteins, and polysaccharides in the settling and dewatering of activated sludge
(Virginia Tech, 1995-08-05)
The roles of cations and exocellular biopolymer on the settling and dewatering of activated sludge was investigated. Both laboratory and full-scale activated sludge systems were examined. The results of the study showed ...
Biopolymer and Cation Release in Aerobic and Anaerobic Digestion and the Consequent Impact on Sludge Dewatering and Conditioning Properties
(Virginia Tech, 1998-08-27)
Sludge dewatering and chemical conditioning requirements were examined from the perspective of biopolymer and cation release from activated sludge flocs. Both aerobic and anaerobic digestion processes were considered ...
Study of Hydrocarbon Waste Biodegradation and the Role of Biosurfactants in the Process
(Virginia Tech, 1998-08-21)
Two types of oily waste sludges generated by a railroad maintenance facility were studied to reduce the volume of hydrocarbon waste. The specific goals of this laboratory study were to evaluate rate and extent of ...
Conditioning for shear in sludge dewatering
(Virginia Tech, 1994-04-10)
The purpose of this study was to determine how chemical conditioning agents and mechanical dewatering devices affect sludge dewatering with respect to shear. Bench scale experiments were performed to determine the effect ...
Effect of Solids Retention Time on Activated Sludge Properties and Effluent Quality
(Virginia Tech, 1998-08-26)
The effect of solids retention time (SRT) or sludge age on activated sludge properties and effluent quality was investigated using laboratory scale reactors. It was found that an increase in SRT resulted in an increase in ...
The effects of ozone treatment on chemical parameters of a recirculating aquaculture system producing hybrid striped bass
(Virginia Tech, 1994-08-05)
The hypothesis tested in this study is that the application of ozone to reuse aquaculture water provides more favorable conditions for hybrid striped bass at production levels. Evaluation of water quality in fish culture ...
Laboratory evaluation of conditioning requirements for sludge dewatering using belt filter press
(Virginia Tech, 1990-12-06)
Sorption and biodegradation of phenanthrene in soils
(Virginia Tech, 1994-05-05)
<p>Soils and groundwaters face an influx of contaminants, many of which are known to be hazardous to the public's health. Several remediation technologies have been developed to clean-up contaminated soils, but additional ...
Effects of biologically produced surfactants on the mobility and biodegradation of petroleum hydrocarbons
(Virginia Tech, 1991-01-15)
<p> A laboratory investigation was conducted to determine the effects of biologically produced surfactants (biosurfactants) on petroleum hydrocarbons and their potential for the removal of hydrocarbons from groundwater ...
Geoenvironmental aspects of coal refuse-fly ash blends
(Virginia Tech, 1994-10-11)
<p>The separate land disposal of coal refuse and fly ash presents difficulties throughout the Appalachian region, both in terms of disposal costs per acre and in terms of its potential environmental impacts on soil, ground ...