Journal - American Water Works Association

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Guidance and recommendations for posttreatment of desalinated water
Journal - American Water Works Association - Tập 104 Số 9 - 2012
Steven J. Duranceau, Rebecca J. Wilder, Susaye S. Douglas
As part of a Water Research Foundation project called Post‐Treatment Stabilization of Desalinated Water, current posttreatment issues related to desalination were explored in an effort to provide guidance to the water industry. Although literature on posttreatment exists, there are fundamental knowledge gaps on accepted water quality goals for posttreated finished water related to location, source... hiện toàn bộ
An evaluation of the calcium carbonate saturation indexes
Journal - American Water Works Association - Tập 75 Số 2 - Trang 95-100 - 1983
John R. Rossum, Douglas T. Merrill
Formulas for calculating six saturation indexes are derived. The indexes are expressed in terms of commonly measured characteristics of water quality. They are evaluated for their ability to determine whether a water is undersaturated, saturated, or oversaturated with respect to calcium carbonate (CaCO3) and to predict the water's capacity for CaCO3 deposition or dissolution. Important concepts th... hiện toàn bộ
Influence of Buffer Capacity, Chlorine Residual, and Flow Rate on Corrosion of Mild Steel and Copper
Journal - American Water Works Association - Tập 79 Số 2 - Trang 62-70 - 1987
A. Pisigan Rodolfo, J. Edward Singley
The corrosion rates of mild steel decreased as buffer capacity was increased with pH at constant alkalinity. The corrosion‐promoting effect of ionic strength, however, appeared to predominate over the buffer action in water systems with relatively high total dissolved solids and chloride levels. The enhanced corrosion of mild steel and copper due to a free chlorine residual was related to the stro... hiện toàn bộ
Influence of NF on distribution system biostability
Journal - American Water Works Association - Tập 91 Số 6 - Trang 76-89 - 1999
Isabel C. Escobar, Andrew A. Randall
In a 12‐month study, nanofiltration achieved high percentages of BDOC removal but was less effective in reducing AOC concentrations.When biodegradable organic matter is not removed during water treatment, bacteria may proliferate in the distribution system. This bacterial growth can deteriorate water quality, accelerate pipe corrosion, and potentially increase the incidence of bacteriological dise... hiện toàn bộ
Determining the concentration of easily assimilable organic carbon in drinking water
Journal - American Water Works Association - Tập 74 Số 10 - Trang 540-545 - 1982
D. van der Kooij, Ate Visser, W.A.M. Hijnen
This paper describes a method for determining the potential of a water for supporting microbial regrowth in a drinking water distribution system. The method is based on the growth of fluorescent pseudomonads as a function of the concentration of easily assimilable organic carbon (AOC) in water. Using this method, the authors analyzed water samples from various stages of water treatment and water i... hiện toàn bộ
Assimilable Organic Carbon as an Indicator of Bacterial Regrowth
Journal - American Water Works Association - Tập 84 Số 2 - Trang 57-65 - 1992
D. van der Kooij
The relationship between the level of regrowth of heterotrophic bacteria and the level of easily assimilable organic carbon (AOC) was determined by collecting and examining a series of distribution water samples from 20 supplies during two summer and autumn periods. The AOC concentration of distribution system water decreased with increasing distance from the treatment plant, but AOC uptake was li... hiện toàn bộ
How particles affect UV light in the UV Disinfection of Unfiltered Drinking Water
Journal - American Water Works Association - Tập 95 Số 4 - Trang 179-189 - 2003
Jason Christensen, Karl G. Linden
This study assessed the impact of suspended particles on both ultraviolet (UV) dose transmission and spectrophotometric absorbance measurement for unfiltered raw water with turbidity up to 10 ntu. Results from bench‐scale collimated beam experiments indicated that a low percentage of total incident UV light was attenuated by particles at 5 ntu turbidity. However, at a set applied UV dose, when par... hiện toàn bộ
Iron oxide–coated fibrous sorbents for arsenic removal
Journal - American Water Works Association - Tập 100 Số 4 - Trang 151 - 2008
Arun Kumar, Patrick L. Gurian, Robin H. Bucciarelli‐Tieger, Jade Mitchell‐Blackwood
Iron oxide‐coated sand has been demonstrated to be an effective adsorbent material for the removal of arsenic and other metals and metalloids from drinking water and wastewater. In this study, fibrous materials were evaluated for their ability to offer a high specific surface area alternative to sand as the substrate for the iron oxide coating. Four types of fibrous materials, polypropylene, polye... hiện toàn bộ
Carbon Regeneration: Dependence on Time and Temperature
Journal - American Water Works Association - Tập 84 Số 3 - Trang 82-91 - 1992
Mark A. Waer, Vernon L. Snoeyink, Kathryn L. Mallon
The time and temperature of regeneration were examined in a bench‐scale study using granular activated carbon (GAC) that had been loaded in a treatment plant and a laboratory. Tire rate of regeneration was constant at a given temperature for time periods up to 30 min and increased exponentially with increasing temperature. The reactivity of the base carbon was important in determining the proper t... hiện toàn bộ
The Logistic Curve as a Model for Carbon Bed Design
Journal - American Water Works Association - Tập 72 Số 1 - Trang 50-53 - 1980
Charles S. Oulman
The technique for determining design parameters for activated carbon columns described here can be used for scaling up the design of a carbon column from laboratory and pilot scale to full scale.
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