Features

May 2013, Vol. 5, No.25

Fast track to quench thirst in Midland, Texas  

Special delivery provides rapid relief for drought-stricken city 

 

feature 1 Todd Larson, Jay Edwards, Dale Cherry, Rusty Eads, and Michael High

 On Jan. 22, 2013, a front-page story in the Dallas Morning News led with the sentence, “The state is running out of water.” Such terms as “drought” and “dust bowl” have peppered the news in Texas for some time now, and water-wise communities in the state already have sprung into action. 

If all goes as expected, work to alleviate critical water shortages in Midland, Texas, caused by severe drought will be wrapping up as you read this article — only 12 months after the launch of a special-delivery groundwater-well-field and conveyance system project to deliver water quickly to a relatively dry city plagued by unusually severe drought. Read full article (login required)  

 

A different disinfectant  

By switching to peracetic acid for disinfection, a Florida city eliminated disinfection byproducts in its effluent while handily complying with requirements for pathogen removal   

 

feature 4 - graham Martha S. Graham and Glabra Skipp
Peracetic acid (PAA) is an approved disinfectant that has been used for decades in the food and medical industries. Historically, the strong oxidizing agent has been considered too expensive for use in disinfecting wastewater. However, growing concerns regarding trihalomethane (THM) compounds have prompted evaluations of nonchlorine-based disinfection alternatives, including PAA. As part of one such evaluation, the City of St. Augustine, Fla., conducted a pilot test to compare the performance and costs of a PAA disinfection system versus a standard chlorination/dechlorination system. Read full article (login required)  

 

Rate increases in this economy?  

The City of Los Angeles shows it can be done, with effective communication and stakeholder collaboration to raise fees for a 10-year capital improvement program 

 

Feature 5  - la san Adel H. Hagekhalil and Lisa B. Mowery
The City of Los Angeles Bureau of Sanitation (LA Sanitation) in 2010 began the process of evaluating adjustments to user fees to meet future program needs. It planned to establish rates that would support sustainable investment in its wastewater program, called the Clean Water Program (CWP), that accurately reflected its perpetual nature.

LA Sanitation used many techniques to build a coalition of supporters and collaboration to develop unanimous support for a long-term rate plan in a difficult economic time. While the focus of these partnerships was rate adjustments, LA Sanitation expects to see long-term benefits from the affiliations that were created during this process.Read full article (login required)  

 

Operations Forum Features

Sacramento, Calif.’s ‘pipe dream’ = data accuracy and big savings 

 A lab built to mimic real-world sewer conditions improves data quality and working conditions   

 

feature 2 - sasd Dave Pitts, Chris Penales, Marva Thompson, and Yadira Downing
During the past 10 years, the Sacramento (Calif.) Area Sewer District (SASD) continually has fine-tuned its comprehensive in-house flow-monitoring program and procedures while striving to enhance its knowledge of the wastewater collection system. The flow-monitoring program provides SASD’s Hydraulic Modeling group with the data needed to calibrate its dynamic sewer model. Read full article (login required)  

 

Solids handling meets odor control 

A New Mexico utility dispenses its iron-laden residuals to its collection system to control odor, with good results 

 

Feature 3 - romanowski Jeffery Romanowski, Scott J. Salvas, Joe F. Bailey, Mark Holstad, Charles S. Leder, and Peter Huhn

In 2009, the Albuquerque Bernalillo County (N.M.) Water Utility Authority (WUA) commissioned a new surface water treatment plant to optimize its renewable water supply resources. The 348,000-m 3 /d (92-mgd) San Juan Chama Water Treatment Plant has a water treatment process that uses ferric chloride as its coagulant and produces ferric hydroxide residuals. 

In 2011, the authority conducted an extended test that demonstrated both the benefits and drawbacks of discharging water treatment residuals to the collection system. Read full article (login required)