Nomenclative Etiquette Austern, Barry M.; Ross, D. A.
Science (American Association for the Advancement of Science),
1971-Jul-09, Letnik:
173, Številka:
3992
Journal Article
Five pilot-scale wastewater treatment processes that provided less than secondary treatment-primary clarification plus filtration, chemical clarification, high-rate trickling filter, aerated lagoon, ...and facultative lagoon-were evaluated for removal of priority pollutants from municipal wastewater. A conventional activated sludge system was operated in parallel as a control. Wastewater feed was spiked with 21 organics dissolved in toluene. Removal of ambient concentrations of five metals was also evaluated. The control typically removed 80 to 90% of volatiles and 85 to 95% of semivolatiles. The facultative lagoon was the best alternative process, followed by the aerated lagoon. Removals of a specific toxic pollutant depended on the properties of the chemical and its interactions with removal mechanisms used in each treatment process.
The U.S. Environmental Protection Agency (EPA), in a long-term program, is conducting research to determine the ability of wastewater treatment processes to remove toxic organics. A previous ...publication reported removals by five less-than-secondary processes and by a conventional activated sludge process as control. One of the less-than-secondary processes was high rate trickling filter, which showed poor toxics removal when compared to the activated sludge system. Because of the numerous trickling filter systems in use for municipal wastewater treatment in the U.S., the high rate trickling filter was converted to a standard rate trickling filter and the toxics removal abilities were determined, again operating in parallel with an activated sludge system as a control.
Renormalization-group analyses show that the three running gauge coupling constants of the standard model do not become equal at any energy scale. These analyses have not included any effects of the ...Higgs boson's self-interaction. In this paper, I examine whether these effects can modify this conclusion, and show that they are too small to affect the failure of coupling constant unification.
PDF
