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Session 20B: Innovation and the Future: Pilot Testing Results
3:00pm - 4:30pm
Session Chair: Tyson Schlect, HDR;
3:00pm - 3:45pm
A Year in the Life of Enhanced Primary Treatment – The Dalles, OR
Shawn Spargo, Benjamin Bosse
Kennedy Jenks Consultants, United States of America; ,
In 2018, the City of The Dalles completed a comprehensive upgrade to its wastewater treatment plant, including Enhanced Primary Treatment facilities. The City installed twin rotating belt filters to divert a significant portion of the carbon load (suspended organics) directly to anaerobic digestion. This has resulted in reduced air demands, increased energy savings, and deferment of secondary process expansion. The City also constructed a new primary anaerobic digester and combined heat and power (CHP) cogeneration system to maximize the City’s return on its investment. This presentation will review the financial performance of this enhanced primary treatment project and compare actual performance, results, and operational data with the findings of the pilot study.
3:45pm - 4:30pm
Full and Demonstration Scale Implementation of Pile Cloth Depth and Compressible Medium Filtration Technologies for Primary Filtration
Onder Caliskaner1, George Tchobanoglous2, Zoe Wu1, Jessica Hazard1, Brian Davis3, Terry Reid3, John Dyson3, Eric Lawrance4
1Kennedy/Jenks Consultants, United States of America; 2University of California at Davis; 3Aqua-Aerobics Systems, Inc.; 4WesTech, Inc.;
Primary filtration (PF) is an advanced primary treatment (APT) technology that can be used as a replacement for conventional primary sedimentation at water resource recovery facilities (WRRF). While demonstrations of PF have thus far shown improved solids and organics reduction as compared to conventional primary sedimentation, evaluation of long-term operational requirements and downstream impacts will provide increased confidence for the use of the PF technology by WRRFs. Two filtration technologies currently being evaluated for applications in PF are pile cloth depth filtration (PCDF) and compressible media filtration (CMF). Full-scale PCDF and demonstration-scale CMF installations are currently being tested at Linda County Water District (LCWD) WRRF. Each installation is operating in parallel to the facility’s primary clarifiers. The purpose of this presentation is twofold: (1) to provide more comprehensive information on the observed long-term performance of PF using CMF and PCDF technologies, and (2) to present the significance of PF with respect to enhanced biological treatment, energy production, and cost for wastewater treatment.
The full-scale PCDF unit has a capacity of 1.5 million gallons per day (MGD) and has been in operation since July 2017. Results from continuous operation have shown removal efficiencies of approximately 85% and 60% for total suspended solids (TSS) and biochemical oxygen demand (BOD), respectively; these removal rates represent significant improvement over performance of primary clarifiers, which typically achieve removal efficiencies of 50-60% for TSS and 25-30% for BOD. The performance of PCDF at LCWD WRRF is consistent with performance observed in other demonstrations of PCDF for PF at other WRRFs.
The demonstration-scale CMF unit was installed at LCWD WRRF in May 2018 and has been in intermittent day operation. Overall treatment performance results show removal efficiencies comparable to PCDF. One distinction of the CMF system is to achieve higher removals of soluble organics, which can provide additional carbon diversion benefits.
With the PF system, aeration requirement (of the downstream secondary treatment process) was observed to decrease approximately 20 to 25 % while increasing the digester gas production by approximately 35 %. Operational and hydraulic performances of both PF technologies were also evaluated and will be included in this presentation.