Abstract
The axial dispersion (longitudinal mixing) which occurs in the aeration chamber of the activated sludge system is investigated to determine the effects of axial dispersion on system performance. In this investigation, the so-called diffusion model is employed to characterize the flow in the aeration chamber. A pattern search technique is used to determine the optimum detention time in the aerator and the optimum return sludge flow rate. Two economic models, the overall size (total volume) of the aeration chamber and clarifier, and the total construction cost based on Smith's correlation for unit costs of subunits of the activated sludge process, are optimized and the results are compared. This analysis shows that the Peclet number, which indicates the extent of longitudinal fluid mixing or dispersion in the aeration chamber, and the feed concentration of organic sewage are two important parameters which affect the optimum design of activated sludge systems. Based on the models used in this work, longitudinal mixing appears to be undesirable, especially when the feed concentration of organic sewage is large.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
