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< Copyright © DWG ASSOCIATES, Inc. 2001-2007 > All Rights Reserved |
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DWG ASSOCIATES, Inc. |
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Design Engineering for Wastewater and Water Systems |
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Specialists in technologies utilizing oxygen or ozone gas |
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DWG ASSOCIATES, the City of Detroit, and Metcalf & Eddy|AECOM presented a paper on the specifications that were developed for the recently completed, large secondary system upgrade at Detroit’s 930 mgd wastewater plant. The presentation, titled “A Simple Specification that Guarantees State-of-the-Art Operating Efficiencies,” discussed how the Detroit specification secured aeration with state-of-the-art energy efficiencies for the secondary system upgrade. The upgraded system will consume 40% less power than the original. |
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WEFTEC 2007 |
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Recent Activities >> Last Update: January, 2008 << |
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Contact information: |
This specification “caps” the owner’s power costs to those associated with the most energy efficient equipment available in the market . . . |
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Working under subcontract to Lee & Ro, Inc., of the City of Industry, CA, DWG ASSOCIATES assisted with the design and specification of a complete instrumentation system upgrade for the high purity oxygen (HPO) OASES secondary system at Orange County’s Treatment Plant #2. DWG ASSOCIATES monitored HPO safety requirements during specification development, construction, and startup. The upgrade is complete and the upgraded system is operating. |
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Orange County’s (CA) instrumentation upgrade |
A high purity oxygen plant instrumentation system upgrade . . . |
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Working under subcontract to Metcalf & Eddy|AECOM, DWG ASSOCIATES developed the process designs necessary to upgrade Detroit’s 930 mgd high purity oxygen (HPO) secondary system. Using DWG ASSOCIATES’ design simulation software HPODesign, we determined optimum oxygen utilizations and design D.O. concentrations for expected future influent characteristics. Our tank, instrumentation, and safety design information were incorporated into a unique set of upgrade specifications. The entire 930 mgd upgrade is currently on line and operating. |
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Detroit’s secondary system upgrade |
At one of the largest plants in the world, a 930 mgd high purity oxygen system upgrade . . . |
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Working with Air Products and Chemicals, DWG ASSOCIATES oversaw the replacement of a plugged “subcooler” in one of Orange County’s (CA) 72 ton per day cryogenic oxygen generators. The project involved removing the old, plugged heat exchanger from inside the coldbox and replacing it with a new unit. Once replaced the refurbished plant was performance tested to ensure that production capacity, product purity, and power consumption all remained within specified magnitudes. In addition to monitoring technical activities, DWG ASSOCIATES audited the final project costs. |
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Cryo Plant refurbishment |
Refurbishing a disabled cryogenic oxygen generator . . . |
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DWG ASSOCIATES, overseeing the aeration equipment manufacturer, tested that manufacturer’s surface aerator in Yuba City’s actual high purity oxygen (HPO) aeration tank. After testing, Yuba City personnel installed one aeration train of the manufacturer’s high efficiency surface aerators. The increased mass transfer capabilities of the high efficiency aerators allows Yuba City to operate with about 35% less dissolution power that the original aerators were consuming. Details of this aerator replacement program were at WEFTEC 2003, in Los Angeles. |
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Yuba City’s (CA) aerator upgrade |
In-the-field aerator test program reduces high purity oxygen system aeration operating costs by 33% . . . |
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DWG ASSOCIATES periodically authors papers describing our current work activities. Below (and above) is a representative selection of our recent papers. Please choose or contact us about whatever interests you.
“Computer Simulation: The Plant Operator’s Optimizing, Troubleshooting, and Training Tool,” was coauthored with the Sacramento Regional County Sanitation District and Carollo Engineers. The paper describes how sophisticated plant simulation software can be used by wastewater treatment plant personnel to improve the operation of their facility.
“Beat Your Service Providers like a Drum and Save Big Bucks in the Process (A Case Study of One Facility that Saved more than $200,000 per year),” was coauthored with the Orange County Sanitation District’s Mr. Mark Esquer. The paper’s title says it all!
“Clean Water Testing of Innovative Surface Aerators Promises Significant Savings for Chattanooga’s Moccasin Bend WWTP,” was coauthored with Consolidated Technologies’ Mr. Gary Cosby. The paper describes the ASCE standardized tap water testing that was conducted to confirm the power consumption guarantees that the surface aerator supplier committed to at bid time.
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Recent Publications/Papers |
You will need Adobe's Acrobat reader, available here, to open or download the papers.
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WEFTEC 2007 |
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Orange County’s (CA) instrumentation upgrade |
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Working with CH2M Hill, DWG ASSOCIATES designed, then monitored equipment purchasing and construction of a complete replacement of old UNOX System mass transfer equipment and instrumentation. Together, CH2M Hill and DWG ASSOCIATES acted as the oxygen system supplier. Removing the system supplier eliminated an entire additional vendor layer, saving the Metropolitan Sewer District considerable money. In addition to the capital cost savings, the new high efficiency aeration equipment is also saving significant operating dollars compared to the old equipment. The upgrade is complete and currently operating. |
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Orange County’s (CA) instrumentation upgrade |
Upgrade your UNOX or OASES System without the system supplier . . . |
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Louisville, KY upgrade (Morris Forman plant) |
