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Now showing items 1-10 of 116
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. ...
Enhanced petroleum-contaminated soil bioremediation by plants
(Virginia Tech, 1995-07-16)
<p>A petroleum-contaminated soil remediation study was conducted in a
greenhouse. The system consisted of 36 pots, 12 were vegetated with squash, 12 were
vegetated with fescue grass and the last 12 units served as unvegetated ...
Factors affecting binding of chlorophenols to soil
(Virginia Tech, 1995-07-06)
Synthetic substituted phenols can become incorporated into soil organic
matter by processes similar to natural humification. Biological, (enzyme-catalyzed),
and abiotic, (mineral surface catalyzed), reactions have been ...
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 ...
Mechanisms of Methanogenic Inhibition in Advanced Anaerobic Digestion
(Virginia Tech, 2009-12-07)
A series of lab-scaled digestion studies including conventional mesophilic anaerobic digestion(MAD), thermophilic anaerobic digestion (TAD) at a range of treatment temperatures, and
mesophilic high solids digestion of ...
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 ...
Investigation of the Interactions Among Grass, Chlorophenols and Microbes
(Virginia Tech, 1999-07-01)
Studies were conducted to explore the interactions among rye grass, chlorophenols and microorganisms. The objectives were to examine some of the processes by which plants affect the fate of subsurface organic contaminants. ...
Extracellular Polymeric Substances in Activated Sludge Flocs: Extraction, Identification, and Investigation of Their Link with Cations and Fate in Sludge Digestion
(Virginia Tech, 2007-08-01)
<p> Extracellular polymeric substances (EPS) in activated sludge are known to account for the flocculent nature of activated sludge. Extensive studies over the last few decades have attempted to extract and characterize ...
Sustainability of reductive dechlorination at chlorinated solvent contaminated sites: Methods to evaluate biodegradable natural organic carbon
(Virginia Tech, 2006-10-31)
Reductive dechlorination is a significant natural attenuation process in chloroethene-contaminated aquifers where organic carbon combined with reducing redox conditions support active dechlorinating microorganisms. At ...
Bioflocculation: Implications for Activated Sludge Properties and Wastewater Treatment
(Virginia Tech, 1998-07-23)
Studies were conducted to determine the role of bioflocculation in the activated sludge unit processes. Laboratory and full-scale studies revealed that bioflocculation is important in determining settling, dewatering, ...