Entries for the 'Water Treatment' Category


It's a topic that makes some a little squeamish, but booming populations and continued droughts have led a few states and countries to take a closer look at processes that bring wastewater back to potable standards. For example, California's Department of Public Health is expected to deliver a report to the legislature next year detailing the feasibility of developing uniform direct potable reuse (DPR) standards for the state. And a DPR facility is already up-and-running in Big Spring, Texas, where groundwater quality is low and the surface water supply is unreliable. 

Despite this growing interest, DPR remains an emerging technology shrouded with concerns about cost, implementation, and public acceptance. Fortunately, these are the very questions tackled in a report released earlier this month at the 30th Annual WaterReuse Symposium in Seattle.

Framework for Direct Potable Reuse provides basic information about potable reuse broadly and the potential benifits DPR can provide utilities plagued with unreliable water supplies, mounting water and energy costs, and pressure to preserve resources and lower their carbon footprint. The 190-page report also addresses health effects associated with DPR, discusses how the process fits into the existing federal regulatory framework, outlines strategies for process monitoring and residuals management, and highlights the importance of operator requirements and maintenance programs. It concludes with a discussion of future regulatory, technological, and public outreach needs. 

Framework for Direct Potable Reuse was developed by WateReuse, the Water Environment Federation (WEF), the American Water Works Association, and the National Water Research Institute. 

The full report is available at the link above. A 4-page summary can also be downloaded on the WEF website


Our partners at the Rural Community Assistance Partnership (RCAP) have released a new instructional video on how to measure chlorine residual in the distribution system.

"This video will cover taking a good chlorine sample and methods for analysis. Effective measurement of chlorine residual is essential for protection of public health. The presence of the residual not only provides disinfection, it also serves and an indicator of water quality. Loss of residual can be an indicator of a water quality problem. Chlorine residual may be measured for compliance or non-compliance purposes. While the analysis will remain the same, how you collect the sample may differ. This video will discuss measurement of chlorine residual using a colorimetry and a handheld spectrophotometer."

Posted in: Water Treatment

This series of 13 videos from Indigo Water Group walks through the procedures for solving common water or wastewater math problems. Viewers are able to learn how to solve problems in a step-wise process by following along with the video, which demonstrates and explains each step.

The playlist contains three unit conversion tutorials, five geometry tutorials, three dosing tutorials, one that calculates pump run time to reduce MLSS concentration, and one that calculates VSS loading rate to an anaerobic digester.


This year’s annual conference of the Association of State Drinking Water Administrators was held on October 23-22, 2014 in Albuquerque New Mexico. There were many interesting presentations on water emergencies, source water planning, and tools for operators as well as new ideas for the future of the drinking water industry. One presentation dug a little bit into the history of the drinking water industry and possibly one its greatest accomplishments, chlorinated disinfection.

Dr. Michael J. McGuire started off by presenting a history of the diseases and deaths that occurred due to contaminated water. He then goes to describe the dilemma of a contaminated water supply in Jersey City, New Jersey in the 1800s. The city contracted with a private water company so they could have a “…pure and wholesome” water supply. Driven by a court order, a Sanitary Advisor named Dr. John Rose Leal determined that some kind of disinfection needed to occur in order to achieve this goal. The disinfection he chose to use was chlorine, a chemical often used at the time in the laundry industry and to disinfect streets and homes after an infectious disease had passed through.

Before this time, using a chemical in water was unprecedented and frankly a little scary. Using the expertise of sanitary engineer George Warren Fuller, they designed a chlorination plant in 99 days. (The system set up as well as pictures of the actual plant can be found at the presentation link below.) The judge approved the design and the system was built. The use of the chemical by the city was a triumph and waterborne illness rates decreased.

The news of success in New Jersey soon spread across the country, and soon after, chlorine use as a disinfectant exploded in the United States. Deaths from typhoid and other diseases related to water contamination diminished to incredibly low levels.

This great accomplishment was a huge advancement for the drinking water industry and helped disinfection technology leap forward. Dr. John L. Leal died soon after his success in New Jersey and was barely recognized for his monumental discovery until 2013, when the New Jersey Section of AWWA and Dr. Michael J. McGuire organized efforts to create a monument in his name.

Dr. McGuire wrote a book on this discovery titled The Chlorine Revolution: Water Disinfection and the Fight to Save Lives. It can be found on Amazon. His conference presentation can be found at the link below as well as in our document database (Keyword: “chlorine revolution”)


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