Chlorine Free Water Treatment Articles
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Pathogen Removal and High Log Reduction Value Crediting for Reverse Osmosis Systems Using Continuous Strontium Monitoring
Public potable water supplies are being stressed by growing population, cyclical droughts, and climate change. One way to sustainably augment the potable water supply is to recycle (reuse) wastewater. This is performed by using a tertiary wastewater treatment facility followed by advanced water purification (AWP) which includes; Reverse Osmosis (RO), UV/advanced oxidation and free chlorine ...
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Variability of water residence time and free chlorine and disinfection by-product concentrations within a residential neighborhood
Sampling campaigns at several points in a sector of a distribution network were conducted during several months to study the spatial and temporal variation of the free chlorine concentration (FCC) and disinfection by-product concentrations (DBPC) at the scale of a residential neighborhood. The water residence times (RT) at these sampling points and for the same period were also simulated ...
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Evaluation of virus reduction efficiency in wastewater treatment unit processes as a credit value in the multiple-barrier system for wastewater reclamation and reuse
The virus reduction efficiency of each unit process is commonly determined based on the ratio of virus concentration in influent to that in effluent of a unit, but the virus concentration in wastewater has often fallen below the analytical quantification limit, which does not allow us to calculate the concentration ratio at each sampling event. In this study, left-censored datasets of ...
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The synergistic effect of
Escherichia coli inactivation by sequential disinfection with low level chlorine dioxide followed by free chlorineTo the best of our knowledge, there was little information available on pathogen removal using low level disinfectant followed by free chlorine in sequential disinfection (SD). This study investigated Escherichia coli inactivation by four types of disinfection: single step disinfection (SSD), SD, traditional sequential disinfection (TSD) and mixed disinfectant disinfection (MDD). Results ...
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Project profile - USEPA arsenic demonstration project Springfield, Ohio – Chateau estates arsenic and iron treatment system
Background AdEdge Technologies Inc. (AdEdge) was selected in 2004 by the U.S. EPA and the host site as part of the Round 2 Arsenic Demonstration Program to implement full scale arsenic treatment for the Chateau Estates Mobil Home Community in Springfield, Ohio. The public water system has approximately 230 connections with an average daily flow of 45,000 gallons per day. AdEdge was contracted by ...
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Inactivation of human adenovirus by sequential disinfection with an alternative UV technology and free chlorine
There has been growing concern over human exposure to adenoviruses through drinking water due to the extreme resistance of human adenoviruses to the traditional UV technology (low-pressure (LP) UV). As an effort to develop an effective treatment strategy against human adenoviruses in drinking water, we determined the effectiveness of sequential disinfection with an alternative UV technology ...
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Effects of phosphorus on biofilm disinfections in model drinking water distribution systems
Drinking water biofilm development is affected by the available nutrient levels and the presence of disinfectants. Phosphorus is recognized as another important limiting nutrient besides organic carbon. In this study, drinking water biofilms were developed in annular reactors to examine the effects of phosphorus on the biofilm disinfections with free chlorine and monochloramine. Phosphorus ...
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Improving TOC Removal to Achieve EPA DBP Compliance at the Green Valley WTP
The Green Valley Water Treatment Plant (WTP) draws its water from two sources to supply Suisun, CA and surrounding communities. The WTP’s distribution system is very long resulting in lengthy detention times where free chlorine used for disinfection reacts with total organic carbon (TOC) to form high levels of Total Trihalomethanes (TTHMs). The Green Valley WTP was unable to adequately reduce the ...
By Ixom
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Disinfection By-Products (DBP) Compliance through Pre-treatment for TOC Removal
Over the last few years, utilities have adjusted their existing processes to reduce the formation of DBPs in order to comply with the Stage 1 DBP Rule. With Stage 2 looming in the near future, many utilities have nothing left to optimize in order to minimize DBP peaking in the distribution systems. A non-chemical treatment process was developed in response to the need to remove greater amounts ...
By Ixom
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Magnetic Ion Exchange Solves Problems
In 2004, Big Elk Water Association, near Estes Park, Colo., earned the unenviable Environmental Working Group label of Colorado water system with the worst quality water. Despite multiprocess treatment, BEWA’s finished water had some of the highest concentrations of total trihalomethanes (TTHMs) and haloacetic acids (HAA5) in the state. BEWA delivers water to about 390 people in Big Elk Meadows, ...
By Ixom
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