Iron-Coated Sponge as Effective Media to Remove Arsenic from Drinking Water

2006 ◽  
Vol 41 (2) ◽  
pp. 164-170 ◽  
Author(s):  
Tien Vinh Nguyen ◽  
Saravanamuthu Vigneswaran ◽  
Huu Hao Ngo ◽  
Damodar Pokhrel ◽  
Thiruvenkatachari Viraraghavan
Keyword(s):  
Drinking Water ◽  
Filtration Rate ◽  
High Capacity ◽  
Small Communities ◽  
Effluent Quality ◽  
Effective Media ◽  
Acceptable Quality ◽  
The World ◽  
New Material ◽  
Dynamic Filter

Abstract Arsenic (As) contamination in drinking water is a serious problem in a number of countries in the world, especially in small communities and developing countries. Arsenic is related to many health diseases. Several technologies such as coagulation, adsorption, ion exchange and membrane processes, etc., are used in removing arsenic from water. In this study, a new material, namely iron-coated sponge (IOCSp), was developed and used to remove As, and it was found that IOCSp has a high capacity for removing both As(V) and As(III). Each gram of IOCSp adsorbed about 160 µg of As upon a 9-h contact of IOCSp with As solution. A dynamic filter column conducted showed that even a small quantity of IOCSp (8 g) could reduce As from 156 µg/L to a concentration of less than 50 µg/L while treating 75 L of groundwater contaminated with arsenic. Both the filtration rate and the size of the sponge had an effect on effluent quality, and the amount of water treated to the acceptable quality.

Arsenic removal by iron oxide coated sponge: treatment and waste management

2009 ◽  
Vol 60 (6) ◽  
pp. 1489-1495 ◽  
Author(s):  
Tien Vinh Nguyen ◽  
Abdur Rahman ◽  
Saravanamuthu Vigneswaran ◽  
Huu Hao Ngo ◽  
Jaya Kandasamy ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Arsenic Removal ◽  
High Capacity ◽  
Water Supply Systems ◽  
Contaminated Water ◽  
Community Water ◽  
The World ◽  
New Material ◽  
Supply Systems ◽  
Better Than

One of the problems in drinking water that raises concern over the world is that millions of people still have to use arsenic-contaminated water. There is a worldwide need to develop appropriate technologies to remove arsenic from water for household and community water supply systems. In this study, a new material namely iron oxide coated sponge (IOCSp) was developed and used to remove arsenic (As) from contaminated groundwater in Vietnam. The results indicated that IOCSp has a high capacity in removing both As (V) and As (III). The adsorption capacity of IOCSp was up to 4.6 mg As/g IOCSp, showing better than many other materials. It was observed from a pilot study that a small quantity of IOCSp (180 g) could reduce As concentration of 480 μg/L in 1.5 m3 of contaminated natural water to below 40 μg/L. In addition, an exhausted IOCSp, containing a large amount of arsenic (up to 0.42 wt %) could safely be disposed through the solidification/stabilization with cement. Addition of fly ash also reduced the amount of arsenic in the leachate.

Resorcinarene Cavitand Polymers for the Remediation of Halomethanes and 1,4-Dioxane

2019 ◽  
Author(s):  
Luke Skala ◽  
Anna Yang ◽  
Max Justin Klemes ◽  
Leilei Xiao ◽  
William Dichtel
Keyword(s):  
Drinking Water ◽  
Activated Carbon ◽  
High Capacity ◽  
The United States ◽  
Water Sources ◽  
Disinfection Byproducts ◽  
Porous Polymer ◽  
Organic Micropollutants ◽  
Executive Summary ◽  
Regulatory Limits

<p>Executive summary: Porous resorcinarene-containing polymers are used to remove halomethane disinfection byproducts and 1,4-dioxane from water.<br></p><p><br></p><p>Disinfection byproducts such as trihalomethanes are some of the most common micropollutants found in drinking water. Trihalomethanes are formed upon chlorination of natural organic matter (NOM) found in many drinking water sources. Municipalities that produce drinking water from surface water sources struggle to remain below regulatory limits for CHCl<sub>3</sub> and other trihalomethanes (80 mg L<sup>–1</sup> in the United States). Inspired by molecular CHCl<sub>3</sub>⊂cavitand host-guest complexes, we designed a porous polymer comprised of resorcinarene receptors. These materials show higher affinity for halomethanes than a specialty activated carbon used for trihalomethane removal. The cavitand polymers show similar removal kinetics as activated carbon and have high capacity (49 mg g<sup>–1</sup> of CHCl<sub>3</sub>). Furthermore, these materials maintain their performance in real drinking water and can be thermally regenerated under mild conditions. Cavitand polymers also outperform activated carbon in their adsorption of 1,4-dioxane, which is difficult to remove and contaminates many public water sources. These materials show promise for removing toxic organic micropollutants and further demonstrate the value of using supramolecular chemistry to design novel absorbents for water purification.<br></p>

Developments in Legislation Related to Treatment of Petroleum Refinery Effluents: A Canadian Overview

1989 ◽  
Vol 24 (3) ◽  
pp. 345-354
Author(s):  
David L. Putnam
Keyword(s):  
Drinking Water ◽  
Petroleum Refinery ◽  
Current Knowledge ◽  
Environmental Regulations ◽  
Public Concern ◽  
Effluent Quality ◽  
Refinery Effluent ◽  
Petroleum Refinery Effluent

Abstract Public concern over toxic contaminants in drinking water and the environment in general has put increasing pressure on governments to develop and enforce stringent environmental regulations. An overview of developments in Canadian federal and provincial legislation related to the regulation of petroleum refinery effluent quality is provided. Current knowledge of Canadian petroleum refinery effluent quality and level of treatment is summarized.

scholarly journals Assessment of drinking water contamination in food stalls of Jashore Municipality, Bangladesh

2021 ◽  
Vol 11 (8) ◽  
Author(s):  
Molla Rahman Shaibur ◽  
Mohammed Sadid Hossain ◽  
Shirina Khatun ◽  
F. K. Sayema Tanzia
Keyword(s):  
Water Quality ◽  
Drinking Water ◽  
World Health Organization ◽  
Fast Food ◽  
Pathogenic Bacteria ◽  
Permissible Limit ◽  
World Health ◽  
Drinking Water Contamination ◽  
The World ◽  
Health Organization

AbstractThis study aimed to determine the quality of drinking water supplied in different types of food stalls in Jashore Municipality, Bangladesh. A total of 35 water samples were collected from different tea stalls, street side fast food stalls, normal restaurants and well-furnished restaurants. The water quality was evaluated by determining the distinct physical, chemical and biological parameters. The results revealed that the water used in the food stalls and restaurants for drinking purpose was in desired quality in terms of turbidity, electrical conductivity, pH, total dissolved solids, nitrate (NO3−), sulfate (SO42−), phosphate (PO43−), chloride (Cl−), sodium (Na) and potassium (K) concentrations. The values were within the permissible limit proposed by the Bangladesh Bureau of Statistics and the World Health Organization. Concentrations of calcium (Ca) and magnesium (Mg) found in several samples were higher than the World Health Organization standard. Iron (Fe) concentrations were higher than the permissible limit of the World Health Organization. Only 46% exceeded the permissible limit of Bangladesh Bureau Statistics. The threatening result was that the samples were contaminated by fecal coliform, indicating that the people of Jashore Municipality may have a greater chance of being affected by pathogenic bacteria. The drinking water provided in the street side fast food stalls was biologically contaminated. The findings demonstrate that the drinking water used in food stalls and restaurants of Jashore Municipality did not meet up the potable drinking water quality standards and therefore was detrimental to public health.

The Application of Anthropological Knowledge to Modern Mass Society: An Anthropologist's View

1956 ◽  
Vol 15 (4) ◽  
pp. 24-29
Author(s):  
John Gillin
Keyword(s):  
Social Behavior ◽  
Field Work ◽  
World Science ◽  
Small Communities ◽  
Human Behaviors ◽  
Mass Society ◽  
The World ◽  
Human Social Behavior ◽  
Modern Mass ◽  
Theoretical Apparatus

Are there any methods whereby we may understand the cultures of modern nation-societies both as to their detailed components and as to their total configurational characteristics? Anthropologists receive such queries because modern ethnological field work and other anthropological methods have been able to produce reliable descriptive analyses of so-called primitive tribes and small communities that are both comprehensive and detailed. And, on the basis of such data collected in a wide variety of cultures around the world, science has acquired not only a rich store of knowledge concerning the substantive varieties of human social behavior, but also a fairly elaborated theoretical apparatus regarding culture in general. With such knowledge and theory it is possible to explain and even to predict many human behaviors and attitudes that were formerly beyond the reach of science.

Predicting Source Water Quality Following Wildfires Using Hydrologic Modeling

2021 ◽  
Author(s):  
Katie Wampler ◽  
Kevin D. Bladon ◽  
Monireh Faramarzi
Keyword(s):  
Water Quality ◽  
Drinking Water ◽  
Organic Carbon ◽  
The United States ◽  
First Year ◽  
Model Parameters ◽  
Source Water ◽  
Forested Watersheds ◽  
Field Samples ◽  
The World

&lt;p&gt;Forested watersheds are critical sources of the majority of the world&amp;#8217;s drinking water. Almost one-third of the world&amp;#8217;s largest cities and two-thirds of cities in the United States (US) rely on forested watersheds for their water supply. These forested regions are vulnerable to the increasing incidence of large and severe wildfires due to increases in regional temperatures and greater accumulation of fuels. When wildfires occur, increases in suspended sediment and organic carbon can negatively affect aquatic ecosystem health and create many costly challenges to the drinking water treatment process. These effects are often largest in the first year following a wildfire. While past research has shown the likelihood of source water impacts from wildfire, the magnitude of effects remains uncertain in most regions. In our study, we will quantify the projected short-term effects of three large (&gt;70,000 ha) wildfires on key water quality parameters (sediment and organic carbon) in two important forested source watersheds in the Cascade Range of Oregon, US. We calibrated and validated a modified Soil and Water Assessment Tool (SWAT) to simulate streamflow, sediment loads and transport, as well as in-stream organic carbon processes for a historical period prior to wildfire. The calibrated model parameters were then modified based on literature values and burn severity maps to represent post-fire conditions of the three large wildfires. The parameter adjustments for simulating wildfire will be validated with post-fire water quality field samples from the wildfires. We will present estimations of future water quality impacts in the burned watersheds under different precipitation conditions at a daily scale for the first year following the wildfires, which will provide testable hypotheses. Additionally, we will determine catchment characteristics most critical in determining the post-fire water quality response. This work will help predict the magnitude of effects from these historic wildfires, which can inform forest and drinking water management decision making.&lt;/p&gt;

An Essay in Critical Biography—Charles Churchill

PMLA ◽  
1920 ◽  
Vol 35 (2) ◽  
pp. 226-246 ◽  
Author(s):  
Joseph M. Beatty
Keyword(s):  
Personal Information ◽  
Early Career ◽  
Original Material ◽  
University Of Cambridge ◽  
Robert Southey ◽  
The World ◽  
New Material ◽  
Edinburgh Review ◽  
The University ◽  
National Biography

A writer in The Annual Register, soon after the death of Charles Churchill, gave to the world the first account of his life; this was followed by The Genuine Memoirs of Mr. Charles Churchill. To Bell's edition of the poet's works is prefixed a life of the author by Doctor Johnson; this does not add anything new. Kippis, in his Biographia Britannica, followed most of the inaccuracies of the first biographer, but added some new material from his personal information. Anderson used these sources in the British Poets (1795). Robert Southey in his Life of Cowper, and William Tooke in an edition of Churchill's Works (1804) made more elaborate studies of the poet's life, but, unfortunately, were satisfied with earlier biographies or neglected to give careful references to original material. John Forster, in The Edinburgh Review (1845) pointed out many of Tooke's inaccuracies. Every biographer of Churchill from Chalmers in his English Poets to Leslie Stephen in The Dictionary of National Biography, followed Tooke, or Tooke modified by Forster. In 1903, R. F. Scott in his Admissions to the College of St. John the Evangelist in the University of Cambridge, made several valuable contributions to our knowledge about the early career of the satirist. Ferdinand Putschi, in Charles Churchill, sein Leben und seine Werke (1909), had not seen Mr. Scott's book, and followed the earlier biographers.

scholarly journals War is hazardous for your health: photographs and testimonies about death, wounds, disease and medical care during the Mexican Revolution

2011 ◽  
Vol 18 (3) ◽  
pp. 893-906
Author(s):  
John Mraz
Keyword(s):  
Drinking Water ◽  
Medical Care ◽  
Mexican Revolution ◽  
Health Issues ◽  
Medical Problems ◽  
Photographic Images ◽  
Secondary Literature ◽  
The World ◽  
Contaminated Drinking Water

Revolutionary wars have devastating and far-reaching effects on the health of the populations caught up in them. However, the deaths and injuries produced by weaponry are only part of the story, because diseases resulting from malnutrition and contaminated drinking water account for the majority of medical problems. This essay uses photographs and testimonies of participants to explore health issues during the Mexican Revolution (1910-1920), as well as incorporating secondary literature on this question. Furthermore, photographic images are not presented as simple (indexical) windows onto the world. Rather, the author attempts to identify the imagemakers and provide explanations that help in imagining the reasons behind the making of the photographs.

Nuclear, Solar and Desalination Working Together Symbiotically

2016 ◽  
Author(s):  
Hamad Alwashmi ◽  
Jay F. Kunze
Keyword(s):  
Drinking Water ◽  
Greenhouse Gases ◽  
Nuclear Power ◽  
Fossil Fuels ◽  
Energy Systems ◽  
Capital Costs ◽  
The World ◽  
Working Together ◽  
Fuel Costs ◽  
Emission Of Greenhouse Gases

In many parts of the world, drinking water is not available except through desalination. Most of these areas have an abundance of solar energy, with few cloudy periods. Energy is required for desalination and for producing electricity. Traditionally this energy has been supplied by fossil fuels. However, even in those parts of the world that have abundant fossil fuels, using them for these purposes is being discouraged for two reasons: 1) the emission of greenhouse gases from combustion of fossil fuels, and 2) the higher value of fossil fuels when used for transportation. Nuclear power and solar power are both proposed as replacements for fossil fuels in these locations. Both of these energy systems have high capital costs, and negligible fuel costs (zero for solar) Instead of these two primary forms of energy competing, this paper shows how they can compliment each other, especially where a significant part of the electricity demand is used for desalination.

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