Groundwater and the Environment

Zektser, I. S.; Everett, Lorne G.

doi:10.1201/9780367801441

Cited by 19 publications

(16 citation statements)

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“…Figure shows the validity of the system for cleanup of other contaminants including nitrate, Cr (VI), selenate and As(III). These contaminants are selected for the test because they are, together with chlorinate solvents, frequently encountered and priority groundwater pollutants . Using a three-electrodes system in Column B, the Cr(VI) concentrations monitored at Port-S4 decrease rapidly after the beginning of electrolysis.…”

Section: Resultsmentioning

confidence: 99%

Electrochemically Induced Dual Reactive Barriers for Transformation of TCE and Mixture of Contaminants in Groundwater

Mao

Yuan

Fallahpour

et al. 2012

Environ. Sci. Technol.

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A novel reactive electrochemical flow system consisting of iron anode and porous cathode is proposed for the remediation of mixture of contaminants in groundwater. The system consists of a series of sequentially arranged electrodes, a perforated iron anode, a porous copper cathode followed by a mesh-type mixed metal oxide anode. The iron anode generates ferrous species and a chemically reducing environment, the porous cathode provides a reactive electrochemically reducing barrier, and the inert anode provides proton and oxygen to neutralize the system. The redox conditions of the electrolyte flowing through this system can be regulated by controlling the distribution of the electric current. Column experiments are conducted to evaluate the process and study the variables. The electrochemical reduction on a copper foam cathode produced an electrode-based reductive potential capable of reducing TCE and nitrate. Rational electrodes arrangement, longer residence time of electrolytes and higher surface area of foam electrode improve the reductive transformation of TCE. More than 82.2% TCE removal efficiency is achieved for the case of low influent concentration (< 7.5 mg/L) and high current (> 45 mA). The ferrous species produced from the iron anode not only enhance the transformation of TCE on the cathode, but also facilitates transformation of other contaminants including dichromate, selenate and arsenite. Removal efficiencies greater than 80% are achieved for these contaminants from flowing contaminated water. The overall system, comprising the electrode-based and electrolyte-based barriers, can be engineered as a versatile and integrated remedial method for a relatively wide spectrum of contaminants and their mixtures.

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Section: Resultsmentioning

confidence: 99%

Electrochemically Induced Dual Reactive Barriers for Transformation of TCE and Mixture of Contaminants in Groundwater

Mao

Yuan

Fallahpour

et al. 2012

Environ. Sci. Technol.

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“…Research demonstrates that by 2025, 1.8 billion people will face an absolute lack of water, while 80% of the population in developing countries will be affected by water de cit (Schlosser et al 2014). The main sources of potable water on Earth are groundwaters, which are the only source of water for 2.5 billion people (Zektser and Everett 2004; Amore 2012; Grönwall and Danert 2020). Groundwaters are considered to be a reliable and safe source of water in most urban and rural areas in all climatic regions of the world, due to some of their characteristics, including constant temperature, good natural quality, low acquisition costs, and the relative ease and exibility of drawing groundwaters (Foster and Chilton 2000;Zektser 2000; Bocanegra et al 2005).…”

Section: Introductionmentioning

confidence: 99%

Groundwater drought risk assessment model as a tool to support sustainable water resources management

Kubicz

Karczewski

2023

Preprint

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As a result of increasing water deficits, low nutritional safety, and environmental degradation, the need to implement sustainable water usage and improve current water management practices became a priority. The changes in the hydroclimatic regimen towards more intense yet less frequent rainfall that have been observed in recent years increase the risk of drought. This leads to the need to mitigate this risk and to reduce the effects of repeated, consecutive periods of water shortage. The objective of article was to present a method for assessing the risk of occurrence of groundwater drought based on the distributions of extreme values of groundwater levels. This goal was achieved, which was shown on the examples of selected observation points of the groundwater level in the catchment of the Odra River. Based on the obtained results, it was demonstrated that the application of the distributions of extreme groundwater level values to assess the risk of occurrence of groundwater drought is an effective tool that supports sustainable water management. It offers the possibility to assess the risk of groundwater drought, which usually leads to water deficits in the affected areas, in a fast and simple way. The risk calculated in this way may be used to classify the areas in terms of the level of risk of the occurrence of groundwater drought. The method presented in this paper may also be used to assess the influence of various factors, including the methods of catchment management, climate changes, on mitigating the risk of occurrence of groundwater droughts.

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“…The main sources of potable water on Earth are groundwaters, which are the only source of water for 2.5 billion people (Zektser and Everett 2004; Amore 2012; Grönwall and Danert 2020). Groundwaters are considered to be a reliable and safe source of water in most urban and rural areas in all climatic regions of the world, due to some of their characteristics, including constant temperature, good natural quality, low acquisition costs, and the relative ease and exibility of drawing groundwaters (Foster and Chilton 2000;Zektser 2000; Bocanegra et al 2005). For example, one may consider that in the last 3 decades of the 20 th century, over 300 million wells were drilled throughout the world to collect water, while about a million wells per year were drilled only in the United States during this period (Zektser 2000).…”

Section: Introductionmentioning

confidence: 99%

Probabilistic quantification in the analysis of groundwater drought in the Odra River Basin

Kubicz

Karczewski

2023

Preprint

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As a result of increasing water deficits, low nutritional safety, and environmental degradation, the need to implement sustainable water usage and improve current water management practices became a priority. The changes in the hydroclimatic regimen towards more intense yet less frequent rainfall that have been observed in recent years increase the risk of drought. This leads to the need to mitigate this risk and to reduce the effects of repeated, consecutive periods of water shortage. The main aim of the study is to present the method of quantification of uncertain events, such as extreme groundwater levels. Following the probabilistic theory of extreme values, the authors verified the hypotheses: both the scale and nature of groundwater risk significantly change in the studied period and over the past 40 years, a rise in the groundwater drought risk in the Odra River Basin has been observed. The application of probabilistic method allowed to draw interesting conclusions groundwater drought risk within the last 10 years has been very high, the lowest risk occurred between 1980 and 1989. Too few points make it impossible to draw conclusions about long-term trends. Meteorological study in those areas indicate a relation between groundwater levels and climate change in recent years, represented by various factors such as precipitation, temperature, humidity. The risk calculated in this way may be used to classify the areas in terms of the level of risk of the occurrence of groundwater drought.

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Groundwater and the Environment

Cited by 19 publications

References 0 publications

Electrochemically Induced Dual Reactive Barriers for Transformation of TCE and Mixture of Contaminants in Groundwater

Electrochemically Induced Dual Reactive Barriers for Transformation of TCE and Mixture of Contaminants in Groundwater

Groundwater drought risk assessment model as a tool to support sustainable water resources management

Probabilistic quantification in the analysis of groundwater drought in the Odra River Basin

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