The three-phase flow in a aeration tank driven by an inverted umbrella aerator is relatively complex, including the processes of hydraulic jump, air entrainment, and sludge particle sedimentation. A test bench for established studying its influence on performance. experiment mainly studies changed law performance under different immersion depths or concentrations measures rate working condition...

Quentin Skinner is an intellectual historian known for his pioneering work on early-modern European political thought. He was educated at Bedford School and Gonville and Caius College, Cambridge. Author of such works as The Foundations of Modern Political Thought (1978) and Visions of Politics (2002) he served as the Regius Professor of History at the University of Cambridge, and currently as t...

We conducted a pilot-scale study at a research facility in southeastern Connecticut to assess the effects of leachfield aeration on removal of nutrients and pathogens from septic system effluent. Treatments consisted of lysimeters periodically aerated to maintain a headspace O(2) concentration of 0.209 mol mol(-1) (AIR) or vented to an adjacent leachfield trench (LEACH) and were replicated thre...

KRASTANOV, A., A. GOVINDARAJAN and D. DANIEL, 2008. Studies on lipase fermentation using Candida cylindracea NRRL Y-17506 in a stired tank bioreactor. Bulg. J. Agric. Sci., 14: 290-299 Lipase is an enzyme of considerable commercial and industrial importance. The major applications of lipase are in the fat and oleochemical, food and dairy, textile, detergent, cosmetics, tea processing, pulp and ...

Shrimps have been a popular raw material for the burgeoning marine and food industry contributing to increasing marine waste. Shrimp waste, which is rich in organic compounds is an abundant source of chitin, a natural polymer of N-acetyl-D-glucosamine (GluNac), a reducing sugar. For this respect, chitinase-producing fungi have been extensively studied as biocontrol agents. Locally isolated Tric...

The parameters affecting the production of pectate lyase from P. polymyxa N10 were studied using the response surface methodology agitation rate (X1, 100-300 rpm), temperature (X2, 25-45 o C) and pH (X3, 5.5-9.5). The most significant factors influencing enzyme production were temperature and pH. The second order polynomial regression model obtained was fitted and found adequate, with an R 2 of...

The paper describes a real example of municipal wastewater treatment and reuse by a membrane bioreactor combined with the alternate cycles process. Focusing mainly on the membrane system, almost every detail of the first year operation regarding loading, membrane cleaning, long-term behaviour, fouling control and power consumptions has been analyzed in details. Long-term operation was carried o...

Fructooligosaccharides derived from microbial enzyme especially from fungal sources has been received particular attention due to its beneficial effects as prebiotics and mass production. However, fungal fermentation is always cumbersome due to its broth rheology problem that will eventually affect the production of FOS. This study investigated the efficiency of immobilized cell system using ro...

AIMS To maximize spore production by Bacillus amyloliquefaciens B128, and its antagonism to the fungal pathogen Botrytis elliptica B061. METHODS AND RESULTS In the 5-l stirred-tank bioreactor (STR), with the 0.5 vvm aeration rate, an agitation rate of 200 rev min(-1) significantly enhanced the spore yield compared to the same in 300 rev min(-1) cultivations. In a 20-l airlift bioreactor (ALR)...

The objective of this paper is to present an experimentally validated mechanistic model to predict the oxygen transfer rate coefficient (Kla) in aeration tanks for different water temperatures. Using experimental data created by Hunter and Vogelaar, the formula precisely reproduces experimental results for the standardized Kla at 20 °C, comparatively better than the current model used by ASCE 2...