نتایج جستجو برای: aeration coefficient

تعداد نتایج: 173335  

انصاری زاده, محمد, محوی, امیرحسین, مصداقی نیا, علیرضا, ندافی, کاظم, نوری, جعفر, واعظی, فروغ,

Background and Aim: The aims of this study was to explore the feasibility of improving efficiency of the wastewater treatment system of the Fars Pegah Dairy Industries (FPDI) and propose ways to upgrade it in 2006-2007. The FPDI wastewater treatment system was of a successive anaerobic-aerobic type using anaerobic stabilization ponds and conventional and extended aeration activated sludge. Due ...

Journal: :applied food biotechnology 0
s. sohrabvandi department of food technology research, national nutrition and food technology research institute, faculty of nutrition sciences, food science and technology, shahid beheshti university of medical sciences, tehran, iran. s.h. malganji department of food science and technology, faculty of food science and technology, islamic azad university, khorasgan (isfahan) branch, isfahan, iran. s.h. razavi department of food science, engineering & technology, faculty of agricultural engineering and technology, university of tehran, po box: 4111 karaj 31587-77871, iran. s.m. mousavi department of food science, engineering & technology, faculty of agricultural engineering and technology, university of tehran, po box: 4111 karaj 31587-77871, iran.

this study aims to determine the effect of fermentation condition and saccharomyces strains on the ph, foam property and co2 concentration of non-alcoholic beer (ma-al-shaeer). for this, the beer samples were inoculated with four different species of saccharomyces (saccharomyces rouxii 70531, s. rouxii 70535, s. ludwigii 3447 and s. cerevisiae 70424) and fermented for 48h in both aerobic and pe...

2009
D. Toye

Experiments were conducted in a 0.25 m diameter bubble column to investigate the effect of animal cell culture medium composition on oxygen transfer rate. Air is used as the dispersed phase. The gas superficial velocity is varied between 0.4 and 2 cm/s (aeration rate ranging between 0.05 and 0.25 vvm) and the bubble column is thus operated in the homogenous regime. Aqueous solutions the composi...

Journal: :Applied and environmental microbiology 1997
R A Kester W De Boer H J Laanbroek

Peak emissions of NO and N(inf2)O are often observed after wetting of soil. The reactions to sudden changes in the aeration of cultures of nitrifying and denitrifying bacteria with respect to NO and N(inf2)O emissions were compared to obtain more information about the microbiological aspects of peak emissions. In continuous culture, the nitrifier Nitrosomonas europaea and the denitrifiers Alcal...

Journal: :Applied and environmental microbiology 2011
Micol Bellucci Irina D Ofiteru David W Graham Ian M Head Thomas P Curtis

In wastewater treatment plants, nitrifying systems are usually operated with elevated levels of aeration to avoid nitrification failures. This approach contributes significantly to operational costs and the carbon footprint of nitrifying wastewater treatment processes. In this study, we tested the effect of aeration rate on nitrification by correlating ammonia oxidation rates with the structure...

Journal: :Journal of hazardous materials 2009
Soon-An Ong Katsuhiro Uchiyama Daisuke Inadama Kazuaki Yamagiwa

Combination of aerobic and anaerobic processes in constructed wetlands can enhance the treatment performance in textile wastewater. This study assessed the treatment of azo dye Acid Orange 7 (AO7) and nutrients using five laboratory-scale up-flow constructed wetlands (UFCW) with and without supplementary aeration, and with different emergent plants. Supplementary aeration controlled the size of...

Journal: :Water science and technology : a journal of the International Association on Water Pollution Research 2006
D Rosso L E Larson M K Stenstrom

Aeration is an essential process in the majority of wastewater treatment processes, and accounts for the largest fraction of plant energy costs. Aeration systems can achieve wastewater oxygenation by shearing the surface (surface aerators) or releasing bubbles at the bottom of the tank (coarse- or fine-bubble aerators). Surfactants accumulate on gas-liquid interfaces and reduce mass transfer ra...

2012
O Doaa M. Atia Faten H. Fahmy Ninet M. Ahmed Hassen T. Dorrah

During the past decade, pond aeration systems have been developed which will sustain large quantities of fish and invertebrate biomass. Dissolved Oxygen (DO) is considered to be among the most important water quality parameters in fish culture. Fishponds in aquaculture farms are usually located in remote areas where grid lines are at far distance. Aeration of ponds is required to prevent mortal...

2014
Shi-yang Zhang Jun-jun Chang Xiao-li Li Ling Tao

To obtain sustainable aquaculture, developing appropriate treatment processes for wastewater is essential. In this study, two three-stage hybrid wetland systems were configured to treat aquaculture effluent. The two systems added with or without artificial aeration were operated under a high HLR (8.0 m/day) with a short retention time (0.96 h). By the results, COD could be effectively removed b...

Journal: :Biomedical papers of the Medical Faculty of the University Palacky, Olomouc, Czechoslovakia 2014
Zuzana Moranova Eric Virtudazo Kristyna Hricova Misako Ohkusu Susumu Kawamoto Vendula Husickova Vladislav Raclavsky

AIMS Limited aeration has been demonstrated to cause slowdown in proliferation and delayed budding, resulting eventually in a unique unbudded G2-arrest in the obligate aerobic pathogenic yeast Cryptococcus neoformans. Also, the ability to adapt to decreased oxygen levels during pathogenesis has been identified as a virulence factor in C. neoformans. The aim of this study was to identify and cha...

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