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Emerging Technologies Aeration March 2013 prepared 2012 Technology Summary Automated SRT/DO Control Objective: Optimization and automatic control of dissolved oxygen (DO) and sludge age (SRT) in aeration systems to optimize DO and SRT set points and reduce energy consumption while maintaining process performance. Description: State of Development: Innovative. The OPTIMasterTM algorithm is approaching an established process while SRTMasterTM has been implemented for over 12 years and DOmasterTM was implemented over 8 years. Proprietary algorithms (OPTIMasterTM), (DOmasterTM) and (SRTMasterTM) which provide set point optimization, based on actual data and process variables: sludge modeling, plant historical data, and statistical process control. The software utilizes a biological process model based control algorithms for sludge age and DO and automates control of these parameters (through automatic sludge wasting and blower output adjustment) to optimize aeration. OPTIMasterTM, DOmasterTM and SRTMasterTM could be used separately or together. Comparison to Established Technologies: This technology represents an improvement to conventional technology as follows: SRTMasterTM allows the automatic control of SRT and equalization of mass solids loading on thickening facility, improving activated sludge process stability and reducing energy usage and chemicals use for sludge thickening. DOmasterTM is an improvement over traditional DO control because it provides more robust control by using activated sludge modeling and data mining instead of traditional PID control. OPTIMasterTM allows automatic selection of DO and SRT set points. The criteria for selection are reduction of energy usage while maintaining low effluent suspended solids concentration and absence of foam. All software modules have artificial intelligence features used for alerting operators about meter problems (TSS, DO, Flow) as well as changes in process BOD loadings or migration of solids to the clarifiers. Available Cost Information: Project Cost of $135,000 for a 22.4 MGD plant (average daily flow) with average energy savings of $26,980/yr and a simple payback period of 5 years. Vendor Name(s): Ekster and Associates Inc. 1904 Lockwood Ave. Fremont, CA 94539 Telephone: 510-657-7066 Email: info@srtcontrol.com Key Words for Internet Search: Installation(s): Oxnard Wastewater Treatment Plant 6001 Perkins Road Oxnard, CA 93033-9047 Telephone: 805-488-3517 Email: Mark.Moise@ci.oxnard.ca.us DO control algorithm, SRT control algorithm, OPTIMasterTM, SRTMasterTM, DOmasterTM, wastewater treatment, Ekster Data Sources: Oxnard Wastewater Treatment Plant Mark Moise, Alex Ekster, Operation of a Solids Contact Tank at Low Dissolved Oxygen and Low Total Suspended Solids Concentrations, Proceedings of WEFTEC, Conference and Exposition, San Diego, 2007. USEPA (2010) Evaluation of Energy Conservation Measures for Wastewater Treatment Facilities. Office of Water. EPA 832-R-10- 005 September 2010. http://water.epa.gov/scitech/wastetech/upload/Evaluation-of-Energy-Conservation-Measures-for-Wastewater- Treatment-Facilities.pdf. 6-4 Wastewater Treatment and In-Plant Wet Weather ManagementPDF Image | Emerging Tech for Wastewater Treatment
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