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Records with

  • Keyword = 'Water treatment' OR chlorination OR chloramine OR biofilm OR 'chlorine inactivation'.
Records 1 to 25 of 2671

2021
A Novel Thin-Film Technique to Improve Accuracy of Fluorescence-Based Estimates for Periphytic Biofilms
(JOURNAL) [Published : May 23, 2021]
Recent studies suggest that photophysiological parameters for intact substrates with depth (e.g., periphytic biofilms, microphytobenthos) are overestimated by pulse-amplitude modulated (PAM) fluorometry. This overestimation results from depth-integration effects, following the ac...
A Science-Based Approach to Understanding and Managing Environmental Risk from PFAS
(PRESENTATION) [Presented : Feb 11, 2021]
The presentation presents EPA ORD's current research program for PFAS. Slides are presented at a high level for all the efforts that are underway in areas such as analytics, exposure, human and environmental toxicity, treatment, and disposal.
A Science-Based Approach to Understanding and Managing Environmental Risk from PFAS - Cincinnati
(PRESENTATION) [Presented : Apr 23, 2021]
This presentation will present EPA/ORD's treatment research for removing PFAS from drinking water.  
Accumulation and release of arsenic from an old cast iron drinking water main
(PRESENTATION) [Presented : Jul 26, 2021]
Arsenic (As) is naturally present in drinking water sources in the forms of arsenite (As[III]) and arsenate (As[V]), with As[V] the dominant form found in water distribution systems. Arsenic can pose human related health threats if consumed drinking water has an excess of total 0...
Activation of inorganic peroxides with magnetic graphene for the removal of antibiotics from wastewater
(JOURNAL) [Published : Apr 01, 2021]
Magnetic graphene catalysts were prepared for the removal of antibiotics (sulfamethoxazole, norfloxacin, tetracycline and flumequine) in wastewater. Different proportions of magnetite-graphene from 1:0 to 0:1 were considered to study the catalytic activation of inorganic peroxide...
Assessing cyanobacterial frequency and abundance at surface waters near drinking water intakes across the United States
(JOURNAL) [Published : Aug 01, 2021]
This study presents the first large-scale assessment of cyanobacterial frequency and abundance of surface water near drinking water intakes across the United States. Public water systems serve drinking water to nearly 90% of the United States population. Cyanobacteria and their t...
Balancing Hydraulic Control and Phosphorus Removal in Bioretention Media Amended with Drinking Water Treatment Residuals
(JOURNAL) [Published : Mar 12, 2021]
Green stormwater infrastructure such as bioretention can reduce stormwater runoff volumes and trap sediments and pollutants. However, bioretention soil media can have limited capacity to retain phosphorus (P) or even be a P source, necessitating addition of P-sorbing materials. W...
Before Corrosion Control: What You Need to Know
(PRESENTATION) [Presented : Sep 02, 2021]
This presentation intruduces regulators, consultants and water system operators/managers to processes that can interfere with corrosion contro treatment (CCT), the critical importance of pH control, what to look for to gather the right (and enough) system and water quality inform...
Biological Activity in US Food Processing Plant Effluent
(PRESENTATION) [Presented : May 06, 2021]
Extended Abstract submission for platform presentation at SETAC Europe Virtual Annual Meeting: ABSTRACT: Complex mixtures of anthropogenically-derived chemicals in freshwater environments have long been established. We previously evaluated agricultural, municipal, and industrial ...
Carbon-based Sustainable Nanomaterials for Water Treatment: State-of-art and Future Perspectives
(JOURNAL) [Published : Jan 04, 2021]
The supply of safe drinking and clean water is becoming increasingly challenging proposition throughout the world. The deployment of environmentally sustainable nanomaterials with unique advantages namely high efficiency and selectivity, earth-abundance, recyclability, low-cost o...
Connecting ecosystem ecology and regional planning: A case study for reducing nutrient loading to the Long Island Sound
(PRESENTATION) [Presented : Aug 06, 2021]
Excess loading of nitrogen and phosphorus to the nation’s waters has had devastating impacts on downstream lakes, estuaries, and coastal zones. The Long Island Sound is one such waterbody that suffers from low dissolved oxygen and excessive algal blooms due to nutrient load...
Development of a non-targeted workflow for water research
(PRESENTATION) [Presented : Apr 22, 2021]
In order to reach detection levels needed for environmentally relevant concentrations, targeted chemical methods are usually limited list of 100 compounds or less. With thousands of industrial chemicals in use today, prioritizing which analytes or mixtures of analytes should be t...
Differences in the Inactivation of Legionella pneumophila Serogroups Using UV-C LED Technology in Drinking Water
(PRESENTATION) [Presented : Jun 08, 2021]
This presentation will discuss results from Legionella pneumophila inactivation experiments using UV light emitting diodes (LEDs) as an emerging water treatment technology to control risks from various water-based pathogens.
Ecological Insights into Assembly Processes and Network Structures of Bacterial Biofilms in Full-scale Biologically Active Carbon Filters under Ozone Implementation
(JOURNAL) [Published : Jan 10, 2021]
To address the adverse effects of harmful algal blooms, there are increased demands over the implementation of ozone-biologically active carbon (BAC) filters in the drinking water treatment plants. Although the microbial biofilms are vital elements to support the proper performan...
Economic Modeling for Source Water Protection
(PRESENTATION) [Presented : Apr 21, 2021]
With the expanding list of concerns about drinking water quality and safety (e.g., harmful algal blooms, disinfection byproducts), it is becoming increasingly important to understand the associated costs and potential benefits of better watershed management for drinking water tre...
Effectiveness of Point-of-Use/Point-of-Entry Systems to Remove Per-and-Poly-fluoroalkyl Substances from Drinking Water
(BOOK CHAPTER) [Published : Jul 29, 2021]
To assist property owners and limit exposure of PFASs in residential drinking water systems, U.S. EPA conducted treatability studies on the PFAS removal effectiveness of commercially available Point-of-Use/Point-of-Entry (POE) Reverse Osmosis (RO) treatment units and Granular Act...
Eyes in the sky monitor cyanobacterial blooms at source waters
(PRESENTATION) [Presented : Sep 02, 2021]
This study uses satellite imagery from the European Space Agency’s Ocean and Land Colour Instrument (OLCI) spanning June 2016 through April 2020. At 300-m spatial resolution, OLCI imagery can be used to monitor cyanobacteria in 685 drinking water sources across 285 lakes in...
Filtration Challenges and Implementation of Solar-Powered Turbidity Control and Backwash Systems to Optimize Drinking Water Treatment and Distribution in Non-PRASA Communities in Puerto Rico
(PRESENTATION) [Presented : Jun 11, 2021]
EPA has been working with community members with optimization of their water treatment and distribution systems. Community members and students are being trained on the use of water quality sensors and instruments to better understand, manage, and use water quality data and reinf...
Green-synthesized nanocatalysts and nanomaterials for water treatment: current challenges and future perspectives
(JOURNAL) [Published : Jan 05, 2021]
The supply of safe drinking and clean water is becoming increasingly challenging proposition throughout the world. The deployment of environmentally sustainable nanomaterials with unique advantages namely high efficiency and selectivity, earth-abundance, recyclability, low-cost o...
How Cyanobacteria Work: Converting Sunlight Into Usable Energy
(PRESENTATION) [Presented : May 25, 2021]
This is a presentation to be delivered as part of the ORD/OW Small Systems Webinar series on May 25, 2021. It discusses the basics of how cyanobacteria convert the energy in solar radiation into chemical bond energy in ATP and NADPH.  ATP and NADPH can then be used throughou...
In vitro effects-based method and water quality screening model for use in pre- and post-distribution treated waters
(JOURNAL) [Published : May 10, 2021]
Recent urban public water supply contamination events emphasize the importance of screening treated drinking water quality after distribution. In vitro bioassays, when run concurrently with analytical chemistry methods, are effective tools to evaluating the efficacy of water trea...
Inability of GSTT1 to Activate Iodinated Halomethanes to Mutagens in Salmonella
(JOURNAL) [Published : Mar 11, 2021]
Drinking water disinfection by‐products (DBPs), including the ubiquitous trihalomethanes (THMs), are formed during the treatment of water with disinfectants (e.g., chlorine, chloramines) to produce and distribute potable water. Brominated THMs (Br‐THMs) are activated ...
Linking water quality to drinking water treatment costs
(PRESENTATION) [Presented : Mar 17, 2021]
With the expanding list of concerns about drinking water quality and safety (e.g., harmful algal blooms, disinfection byproducts), it is becoming increasingly important to understand the associated costs and potential benefits of better watershed management for drinking water tre...
Metagenome, Metatranscriptome and Metagenome-Assembled Genome Reveal Changes in Composition and Function of Five Waterworks with Different Treatment Processes in Finland
(PRESENTATION) [Presented : Jun 24, 2021]
The emergence and development of next-generation sequencing technologies (NGS) has made the analysis of the water microbiome in the drinking water distribution systems (DWDSs) more accessible and opens new perspectives in microbial ecology studies. The current study focused on th...
Modeling Water Treatment Performance and Costs for Removal of Per- and Polyfluoroalkyl Substances from Drinking Water
(BOOK CHAPTER) [Published : Jul 29, 2021]
Per- and polyfluoroalkyl substances (PFAS) are a diverse class of compounds. In the last few years, many environmental and health agencies have set or are expected to promulgate regulatory limits for select PFAS at concentrations found in environmental waters. This has led variou...