Monday, April 29, 2013: 8:00 a.m.
Regency East 1 (Hyatt Regency San Antonio)
Matthew Zucca, P.E., Erler & Kalinowski, Inc.
Dan Rich, P.E., NEXGEN Utility Management
Conventional experience related to (1) conservation, (2) water treatment, (3) wastewater collection system management, (4) wastewater treatment, and (5) wastewater disposal have historically been separated. Water conservation evaluations look at avoided costs associated with infrastructure for both water and wastewater based upon an assumption that reduced or deferred consumption of water through conservation will defer capital and operational costs of wastewater.
As water conservation increases, the chemical characteristics of wastewater will also change. In particular, humans tend to generate the same mass of organic waste per day regardless of the amount of indoor water use. The same concept applies to salts introduced into the wastewater stream. As conservation increases, the concentration of these constituents will increase correspondingly. As a result, wastewater treatment plants, while they will potentially see reduced flows, will experience increased BOD and salt concentrations on the influent wastewater.
With respect to salts, waste discharge permits often limit effluent concentrations in terms of salinity to certain values relative to either (1) current concentrations or (2) increases in concentration relative to salts in source water. As water conservation increases over the foreseeable future, salt concentrations will increase given the constant mass loading but reduced volume of water associated with conservation. Salinity removal is expensive, especially for inland communities that must concentrate and dispose the brine produced.
This presentation will explore both and quantify the potential effects of water conservation based upon a real case study for the City of Woodland, California where the Alliance for Water Efficiency water conservation tool was used to estimate water conservation savings over time. The associated effects on solids, BOD, and salt concentrations and the anticipated impacts to the City of Woodland will be discussed.
| Matthew Zucca, P.E.
, Erler & Kalinowski, Inc.
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Mr. Zucca has almost 20 years of professional experience and has had lead roles for a wide range of engineering projects, including evaluation and master planning of potable water distribution systems, urban water management plans, engineering design, construction review, and operation and maintenance of varied treatment systems, including both water and stormwater treatment. He has performed water demand and conservation modeling for large, new developments as well as existing communities to estimate the effect of water conservation measures on total water demands.
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| Dan Rich, P.E.
, NEXGEN Utility Management
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Mr. Rich is a professional engineer with over 20 years of wastewater engineering experience. He specializes in the permitting, planning and design of wastewater systems and has completed over 20 wastewater master plans for communities across the Central Valley of California. His recent work has focused on salinity and nitrates in POTW discharge permits.
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