Irreversible sorption of natural hydrocarbons to sediments; experimental observations and model predictions
Article Abstract:
A study has developed and used a semiempirical irreversible sorption isotherm model to correlate most field observations regarding contaminant release in the sediment or solid phase. The study is founded on the notion that desorption is not the opposite of adsorption, as a significant fraction of some contaminants is bound into sediments irreversibly. The study utilized and tested various chemicals including an aromatic compound, a halogenated aromatic compounds, two polycyclic aromatic hydrocarbons, two polychlorinated biphenyls, and a chlorinated pesticide, as well as various types of sediments containing different organic contents. The isotherm equation developed comprises a linear term to represent reversible sorption, and a Langmuirian-type term to represent irreversible sorption.
Comment:
Irreversible sorption isotherm model has been dvlpd to explain field observations on contaminant release in sediment/solid phase
Publication Name: Environmental Science & Technology
Subject: Science and technology
ISSN: 0013-936X
Year: 1998
User Contributions:
Comment about this article or add new information about this topic:
Enrichment of high-rate PCE dechlorination and comparative study of lactate, methanol, and hydrogen as electron donors to sustain activity
Article Abstract:
Lactate, methanol and hydrogen were used as electron donors to sustain rapid rates of tetracholroethene (PCE) dechlorination in mixed cultures of anaerobic bacteria. Researchers at Rice University in Houston, TX, found no notable difference among the electron donors in terms of the extent of dechlorination. Over time, the researchers recovered PCE as about 80% vinyl chloride and 20% ethene, regardless of electrod donor used. The study also found rates and extents of PCE dechlorination to have improved over time in systems containing high molecular hydrogen pressures in the presence of an active methanogenic community.
Comment:
Electron donors sustain rapid rates of tetrachloroethene dechlorination in mixed cultures
Publication Name: Environmental Science & Technology
Subject: Science and technology
ISSN: 0013-936X
Year: 1998
User Contributions:
Comment about this article or add new information about this topic:
Characterization of landfill gas composition at the Fresh Kills municipal solid-waste landfill
Article Abstract:
Nonmethane organic compound (NMOC) measurement data in a Fresh Kills, NY, municipal solid waste landfill, suggests that gas composition in the landfill is equal to the composition of gas passing through passive vents and soil cover. The study involves collection of more than 250 separate gas samples, analyzed for around 150 various analytes. The landfill was found to have an average total NMOC value of 438 ppmv (as hexane) as compared to the regulatory default of 4000 ppmv. The data also showed spatial, temporal, and measurement variability in the gas composition.
Comment:
Nonmethane organic compound data suggests that gas composition is equal to gas passing through passive vents & soil cover
Publication Name: Environmental Science & Technology
Subject: Science and technology
ISSN: 0013-936X
Year: 1998
User Contributions:
Comment about this article or add new information about this topic:
- Abstracts: Dynamic model development. Experimental evaluation of a dynamic model. Inductively coupled argon plasma continuous emissions monitor for hazardous air pollutant metals
- Abstracts: Early evolution of continents. How vanished oceans drop an anchor. Seeing a mountain in a grain of garnet
- Abstracts: Theoretical and experimental analysis of peeper equilibration dynamics
- Abstracts: On deformation of A-M interface in single crystal shape memory alloys and some related issues. Experimental characterization of crack tip deformation fields in alloy 718 at high temperatures
- Abstracts: Innovative contractual structures for inter-organizational systems