Enhanced Biological Removal of Toluene from Aqueous Systems

1988 ◽  
pp. 454-454
Author(s):  
Jon Lindstrom ◽  
Conrad Vernon ◽  
Ed Brown
Keyword(s):  
Aqueous Systems ◽  
Biological Removal

Biological removal of chlorate from kraft bleach plant effluent

1993 ◽  
Vol 8 (3) ◽  
pp. 302-306a ◽  
Author(s):  
Åsa Malmqvist ◽  
Lars Gunnarsson ◽  
Thomas Welander ◽  
Mats Nystrom ◽  
Solvie Herstad-Svard ◽  
...  
Keyword(s):  
Biological Removal

The Biological Removal of Phosphorus in a Sequencing Batch Reactor (SBR) – Practical Considerations and Research Observations

1985 ◽  
Vol 17 (11-12) ◽  
pp. 311-312
Author(s):  
J. F. Manning ◽  
R. L. Irvine ◽  
E. F. Barth ◽  
S. C. Chiesa
Keyword(s):  
Sequencing Batch Reactor ◽  
Batch Reactor ◽  
Biological Removal

Biological removal of algae in an integrated pond system

1995 ◽  
Vol 31 (12) ◽  
pp. 21-31 ◽  
Author(s):  
P. G. J. Meiring ◽  
R. A. Oellermann
Keyword(s):  
Adsorptive Capacity ◽  
Trickling Filter ◽  
Laboratory Findings ◽  
Oxidation Pond ◽  
Trickling Filters ◽  
Biological Removal ◽  
In Series ◽  
The Media ◽  
Oxidation Ponds ◽  
Dark Green

A system of oxidation ponds in series with a biological trickling filter is described. It was known that this arrangement was incapable of reducing effectively the levels of algae present in the pond liquid even though nitrification was effected because of autotrophic conditions prevailing in the trickling filters. This very low trophic level explained the lack of adsorptive capacity present. By shortcircuiting less than 10 percent of the effluent from a fully loaded primary facultative oxidation pond to the trickling filter, the autotrophuc nature or the film in the trickling filter was sufficiently shifted towards a heterotrophic state that had sufficient adsorptive capacity to retain the majority of the algae. It is concluded that the algae, although being absorbed, stay alive on the film and do not contribute significantly to the carbonaceous load on the trickling filter. Further more the algae, although secluded from all sunlight, actually partake in the purification process, producing an effluent which, unlike a normal humus tank effluent, is surprisingly sparkling clear. This significant observation appears to be in line with laboratory findings by others who, when they artificially immobilised certain species of algae and passed water over them, concluded that the algae retained the potential to remove certain compounds from the water. Conglomerates of biologically flocculated dark-green algae are scoured off the film (or sloughed off as part of the film) and, having been photosynthetically inactive for some days, tend not to float, but settle very rapidly. A very significantly aspect of this development is the great potential it has for practical application in developing countries. The algae sloughed off the media are easily thickened and available for ultimate recovery from the water phase without the addition of chemicals.

Novel biological removal of hazardous chemicals at trace levels

2000 ◽  
Vol 42 (12) ◽  
pp. 49-60 ◽  
Author(s):  
P.L. McCarty
Keyword(s):  
Plug Flow ◽  
Chlorinated Solvents ◽  
Biological Removal ◽  
Sanitary Landfills ◽  
Low Levels ◽  
Trace Chemicals ◽  
Engineered Systems ◽  
Biological Methods ◽  
Aerobic And Anaerobic ◽  
Flow Treatment

Of recent concern is the removal of toxic compounds in wastewaters, soils, and groundwater to concentrations in the low microgram per litre level or less. Threshold limits to bioremediation exist and must be considered in biological treatment schemes to achieve such limits. These limits may be related to reaction kinetics or thermodynamics. Techniques for removing compounds below threshold levels exist that rely on appropriate approaches such as plug flow treatment. Novel biological methods exist for removal of refractory contaminants to low levels. Examples are provided for removal of trace levels of chlorinated solvents, such as tetrachloroethene (PCE) and trichloroethene (TCE), that employ dehalorespiration under anaerobic conditions or cometabolism under aerobic conditions. These approaches are currently being used in engineered systems or through natural attenuation for remediation of soils and groundwater. Successful results offer insights for similar removals of trace chemicals in both aerobic and anaerobic biological systems for treatment of wastewaters and sanitary landfills.

Plutonium release from radioisotope heat sources into aqueous systems

1989 ◽  
Author(s):  
R.C. Heaton ◽  
W.M. Jones ◽  
K.P. Coffelt
Keyword(s):  
Heat Sources ◽  
Aqueous Systems
Sign in / Sign up

Export Citation Format

Share Document