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Bài giảng công nghệ môi trường_24

Tham khảo bài viết 'bài giảng công nghệ môi trường_24', khoa học tự nhiên, công nghệ môi trường phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | DI I VAN LANG UNIVERSITY PARTMENT OF ENVIRONMENTAL TECHNOLOGY AND I MANAGEMENT SPECIALIZED ENGLISH - SEMTESTER 5 Chapter 24 FUNDAMENTALS OF BIOLOGICAL STEWATER TREATMENT REUSE VERSITY Bacterial growth Dr. Tran Thi My Dieu Sep.2011 BACTERIAL REPRODUCTION Is it important in biological treatment BACTERIAL REPRODUCTION Is it important in biological treatment Bacteria reproduce by 1 original cel Binary fission becomes 2 new ones Asexual mode _ Budding Generation time 20 min - days Assume Spherical-shaped bacteria 1 pm diameter Specific gravity of 1.0 Generation time 30 min Estimate bacteria mass after 12 h VAN LANG UNIVERSITY DENTEMA BACTERIAL REPRODUCTION Is it important in biological treatment Estimate bacteria mass after 12 h Weight of 1 cell 5.0 x 10-13 g Bacteria mass in 12 h 8.4 x 10-6 g Number of cell is quite large compared to the mass In biological treatment systems bacteria would not continue to divide indefinitely because of environmental limitations substrate and nutrient VAN LANG UNIVERSITY - DENTEMA CTERIAL GROWTH PATTERNS IN A BATCH REACTOR Batch process bioliVAVs growth phases with n substrate and biomass versus time dentema 1 BACTERIAL GROWTH AND BIOMASS YIELD BACTERIAL GROWTH AND BIOMASS YIELD g biomass produced Biomass yield Y j J g substrate utilized g biomass g COD removed g biomass g BOD removed g biomass g VFAs used How to measure biomass Increase in biomass can be measured by Volatile suspended solids VSS or pCOD Protein content growth relates to true microbial mass DNA if the reactor solids contain proteins g biomass g N-NH4 oxidized ATP if the reactor solid contain proteins How to measure biomass Turbidity if very low biomass concentration Bacterial cell counts VAN LANG UNIVERSITY DENTEMA BACTERIAL GROWTH AND BIOMASS YIELD How to estimate biomass yield Estimating biomass yield and oxygen requirements from stoichiometry Estimating biomass yield from bioenergetics VAN LANG UNIVERSITY DENTEMA BACTERIAL GROWTH AND BIOMASS YIELD Estimating biomass .