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URBAN WATER RESEARCH CENTER OXYGEN TRANSFER IN ACTIVATED SLUDGE PROCESSES:! BUBBLES, MIXERS et al.! Diego Rosso University of California, Irvine SUMMARY I.  EFFECTS OF WASTEWATER CONTAMINANTS ON OXYGEN TRANSFER II.  AERATION SYSTEMS III.  MEASUREMENT OF OXYGEN TRANSFER IN CLEAN WATER IV.  MEASUREMENT OF OXYGEN TRANSFER IN WASTEWATER V.  ENERGY CONSIDERATIONS VI.  SITE-SPECIFIC DESIGN CONSIDERATIONS VII.  CONCLUSIONS I. EFFECTS OF WASTEWATER CONTAMINANTS ON OXYGEN TRANSFER Terminology OTE: Oxygen Transfer Efficiency (%) OTR: Oxygen Transfer Rate (kg /h) O2 SOTE: Standardized OTE in clean water (%) αSOTE: Standardized OTE in process water (%) α  = αSOTE/SOTE (water quality estimate) DWP = Dynamic wet pressure (diff. headloss, Pa) WHAT ARE THESE CONTAMINANTS? CONTAINS: 15-25% anionic surfactants 0-15% non-ionic surfactants 0-15% soap 0-15% cationic surfactants fillers to 100% SURFACTANT STRUCTURE Amphiphilic structure  Interfacial accumulation (Fujimoto, 1985) Hydrophobic Polar tail head SURFACTANT INTERFACIAL ACCUMULATION LOW INTERFACIAL VELOCITY = HIGH SURFACTANT ACCUMULATION = LOW ALPHA (BUT HIGH SOTE) LIQUID GAS STAGNANT TURBUL. LIQUID GAS HIGH INTERFACIAL VELOCITY = LOW SURFACTANT ACCUMULATION = STAGNANT TURBUL. HIGH ALPHA (BUT LOW SOTE) Alpha and SOTE a h p a l FINE-BUBBLES COARSE-BUBBLES BUBBLE SIZE

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α: THE MOTHER OF ALL “FUDGE” FACTORS. Cost Alpha: Conventional vs. NDN. 0. 20. 40 TRADITIONAL OFF-GAS TESTING SETUP. HOOD$.

ROSSO (2013) Aeration Research - for pdf PDF

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α: THE MOTHER OF ALL “FUDGE” FACTORS. Cost Alpha: Conventional vs. NDN. 0. 20. 40 TRADITIONAL OFF-GAS TESTING SETUP. HOOD$.

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Author:	Unknown
Publication Year:	2014
Pages:	49
Language:	English
File Size:	53.85
Format:	PDF
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