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Emerging Technologies Mixing Intermittent Mixing Objective: Reduce energy usage for maintaining solids in suspension in biological nutrient removal reactors and mixed liquor channels. Description: March 2013 prepared 2012 Technology Summary State of Development: Innovative. This technology is being used in the US and was implemented at a US plant in 2008. An optimization algorithm is used to convert mixing in the anoxic/anaerobic zones of BNR reactors and mixed liquor channels from continuous to intermittent (On/Off). This patent pending method of maintaining solids in suspension allows reduced energy usage without compromising effluent quality and process reliability. A special programming routine is used to avoid aeration control system oscillation. The routine sequences the tanks rather than simultaneously providing air to all the tanks to re-suspend solids. Aeration system modifications are often required including installation of new valves, actuators, pneumatic lines, and electrical systems, in addition to control system programming. Comparison to Established Technologies: As shown below, the intermittent mixing provides significant energy savings compared to the continuous mixing method. Available Cost Information: Project Cost of $181,592 for a 167MGD plant (average daily flow) at the San Jose/Santa Clara Water Pollution Control Plant, with average energy savings of $757,614 and a simple payback period of 3 months. This corresponds to reduction in associated aeration energy in the range of 23% and 38%. Another study showed pulse aeration of anaerobic and anoxic zones resulted in 13% less aeration demand with an annual energy saving potential close to $430,000. 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: Pump stations, Pumping, Pumps Scheduling, Ekster Data Sources: San Jose/ Santa Clara Water Pollution Control Plant Installation(s): San Jose/ Santa Clara Water Pollution Control Plant (SJ/SC WPCP) 700 Los Esters Rd., San Jose, CA 95134 Bhavani.Yerrapotu, Division Manager Telephone: 408-945-5300 Email: Bhavani.Yerrapotu @sanjoseca.gov Issayas T. Lemma, Steve Colby, Tom Herrington. Pulse Aeration of Secondary Aeration Tanks Holds Energy Saving Potential without Compromising Effluent Quality Proceedings of 82nd WEFTEC, Conference and Exposition, Orlando, 2009. 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. 6-10 Wastewater Treatment and In-Plant Wet Weather ManagementPDF Image | Emerging Tech for Wastewater Treatment
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