Now showing items 1-10 of 107
Shear Forces, Floc Structure and their Impact on Anaerobic Digestion and Biosolids Stability
(Virginia Tech, 2006-07-20)
<p> This study was conducted to address the controlling factors of biosolids stability as they relate to mesophilic anaerobic digestion, dewatering processes and digestion enhancement by wet sludge disintegration technologies. ...
Fate and Transport of Endocrine Disrupting Compounds during Wastewater Treatment: The Role of Colloidal and Particulate Material
(Virginia Tech, 2003-07-22)
The presence of biologically-active estrogenic endocrine disrupting compounds (EDCs) in treated effluents from biological wastewater treatment facilities has prompted wide-spread interest in the behavior of these contaminants ...
Laboratory evaluation of conditioning requirements for sludge dewatering using belt filter press
(Virginia Tech, 1990-12-06)
Chemical and Biological Treatment of Acid Mine Drainage for the Removal of Heavy Metals and Acidity
(Virginia Tech, 1997-08-11)
This dissertation reports the design of a process (patent pending) to remove iron from acid mine drainage (AMD) without the formation of metal hydroxide sludge. The system includes the oxidation of ferrous iron in a ...
An Investigation into the Mechanisms of Sludge Reduction Technologies
(Virginia Tech, 2009-03-30)
Anaerobic digestion has been the preferred method for reducing and stabilizing waste sludge from biological wastewater treatment for over a century; however, as sludge volumes and disposal costs increase, there has been a ...
Relationships Between Hybrid Poplar Tree Extractives and Ground Water Contamination at a Phytoremediation Site
(Virginia Tech, 2003-02-26)
<p> In 1997, a phytoremediation program began at a creosote-contaminated former railroad tie yard in Oneida, Tennessee with the planting of over 1000 hybrid poplar trees onsite. Creosote, a mixture of hazardous chemicals ...
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 ...
Removal of trace elements from coal using a multiple-property processing circuit
(Virginia Tech, 1994-07-15)
<p>The U.S. Environmental Protection Agency is conducting a three-year study of toxic air emissions specific to coal fired utilities to assess the potential health risks of trace elements released during coal combustion. ...
Reversible and irreversible adsorption of naphthalene and α-naphthol to soil
(Virginia Tech, 1995-05-03)
Experiments were performed with naphthalene and a-naphthol to compare the processes involved in the sorption of a polycyclic aromatic hydrocarbon (PAH) and its metabolite, respectively, and to assess the bioavailability ...
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 ...