Until the upcoming of readily available microbial genetic techniques, nitrification was the single most studied microbial process in environmental engineering.
Denitrification is one of the most widely distributed microbial processes, second only to aerobic respiration [46].
Since the reactants in this fermentation process are, unlike in most microbial fermentations, solely gasses, the gas liquid mass transfer is supposed to play an important role on the way to a higher volumetric productivity.
Among the different hypotheses microbial processes before or during sewage treatment have been the most accepted hypothesis [16, 17].
This is extremely important for an understanding of microbial processes occurring in environmental and engineered biofilm systems, because most microbial transformations are catalyzed by consortia and not by single species of microorganisms.
Thus, differences measured in applied concentrations of -catechin and concentrations of -catechin in soils are most likely due to transformation of the pure form through chelation, sorption, oxidation, microbial processes, or other unknown soil effects.
One of the most interesting implications of this mat study is the extremely uneven spatial distribution of mat-associated microbial processes in surficial sediments at seep sites.
The samples, containing 1% NaF to prevent microbial processes, were stored at +4 °C until and during the laboratory investigation, which in most cases was completed within 12 days of arrival of the sample.
Indeed, to date, most field observations of enhanced reductive dechlorination in treated source zones have been fortuitous, with little thought devoted to microbial processes in the initial design and implementation of the treatment monitoring scheme.
Most reducing equivalents from the electron donor (glucose) were consumed in reductive dechlorination, probably due to the inhibition of other microbial processes by the high chloroethene concentrations.
