Toxic compounds in sewage or industrial wastewater may inhibit the biological activity of activated sludge impairing the treatment process. This paper evaluates the Inhibition Capacity Index (ICI) for the assessment of activated sludge in the presence of toxicants. In this study, activated sludge was obtained from industrial treatment plants and was also synthetically produced. Continuous respi...

AIn increase of C'4O., pro(luction from acetate-i-C'4 and acetate-2-C14 in corn roots by 2,4-D treatment has been reported; the percenitage increase was larger fronm the methbl carbon than from the carboxyl carbon (4). Usinig root tissues it was found that 2,4-D cause(d an increase in the amliouint of glucose catabolized via the pentose phosphate pathxway in root tissues (3). Whlen bean stem ti...

This article explores both sides of the controversy concerning respiratory behaviors and dentofacial development. The literature is replete with statements that airway impairment alters facial and dental growth, but there also is substantial evidence to the contrary. Much of the confusion stems from the subjective criteria frequently used in defining the terms impairment and mouth breathing. Ad...

Meyerhof (1917) found that the oxygen uptake of suspensions of the organism provided with ammonia agreed well with nitrite production in the suspensions. Bomecke (1939) established that the organisms had an oxygen uptake in the absence of ammonia; however, this endogenous respiration is very small and, although ofconsiderable biochemical significance, is quantitatively negligible in ordinary re...

The aim of this paper was to evaluate the performance of biotrickling filters (BTFs) for treating low concentrations of dimethyl disulfide (DMDS), using different bacterial consortia adapted to consume reduced sulfur compounds under alkaline (pH ≈ 10) or neutral (pH ≈ 7) conditions. Solubility experiments indicated that the partition of DMDS in neutral and alkaline mineral media was similar to ...

The effect of the food/microorganisms (F/M) ratio and dissolved oxygen (DO) concentration in sequencing batch reactors (SBRs) on the microbial activity has been examined. One of the SBRs was fed with synthetic wastewater containing inorganic carbon compounds (COD/N ratio 0.7 g COD/g N). To the other SBR, both inorganic and organic carbon was supplied leading to 6.9 g COD/g N. The F/M ratios in ...