Application of vadose-zone monitoring system for real-time characterization of leachate percolation in and under a municipal landfill

Aharoni, Imri; Siebner, Hagar; Dahan, Ofer

doi:10.1016/j.wasman.2017.05.012

Cited by 42 publications

(20 citation statements)

References 42 publications

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“…The EOL of HWLs is affected by many factors, such as the anti-aging properties of the material (geomembrane capacity and drainage layer anti-clogging ability) and the concentration of leachate and site factors (vadose zone thickness, permeability coefficient, aquifer thickness, and permeability coefficient) 40,43 . The aging properties of the material are often difficult to control, but the concentration of leachate can be controlled by managing the leaching concentration limits.…”

Section: Discussionmentioning

confidence: 99%

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Framework, method and case study for the calculation of end of life for HWL and parameter sensitivity analysis

Xiang

Liu

et al. 2020

Sci Rep

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Mass construction and operation of hazardous waste landfill infrastructure has greatly improved China’s waste management and environmental safety. However, the deterioration of engineering materials and the failure of landfill may lead to the release of untreated leachate rich in persistent toxic pollutants to the soil and shallow groundwater. Accordingly, we develop the framework and process model to predict landfill life by coupling the landfill hydrological performance model and material degradation model. We found that the decrease rate of the concentration of persistent pollutants in leachate was significantly slower than the deterioration rate of the landfill engineering materials. As a result, when the materials failed, the leachate with high concentrations of persistent pollutants continued to leak, resulting in the pollutants concentration in surrounding groundwater exceeding the acceptable concentration at around 385 a, which is the average life of a landfill. Further simulation indicated that hydrogeological conditions and the initial concentration of leachate will affect landfill lifespan. The correlation coefficients of concentration, the thickness of vadose zone and the thickness of aquifer are − 0.79, 0.99 and 0.72 respectively, so the thickness of vadose zone having the greatest impact on the life of a landfill. The results presented herein indicate hazardous waste landfill infrastructure reinvestment should be directed toward long-term monitoring and maintenance, waste second-disposal, and site restoration.

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Section: Discussionmentioning

confidence: 99%

“…However, there is a lag time (approximately equal to the BP) before the concentration of pollutants in drinking wells responds to the rapid increase in leakage. This time is greatly affected by the thickness of the natural base layer and the vadose zone, as well as the groundwater flow rate 40,41 . In the present case, this time is about 70 a.…”

Section: Zn F Crmentioning

confidence: 99%

Framework, method and case study for the calculation of end of life for HWL and parameter sensitivity analysis

Xiang

Liu

et al. 2020

Sci Rep

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“…The potential for in-situ monitoring of the unsaturated zone has been demonstrated through several studies where the VMS was used to measure flow velocities, solute transport, and chemical transformation of contaminants across the unsaturated zone. It has been implemented in a variety of studies on water flow and contaminant transport including: (a) rainwater infiltration and groundwater recharge (Rimon et al, 2007(Rimon et al, , 2011a, (b) floodwater infiltration from stream channels and reservoirs (Shani, 2006;Dahan et al, 2007Dahan et al, , 2008Dahan et al, , 2009, (c) impact of agricultural practices on groundwater quality (Baram et al, 2012;Dahan et al, 2014;Turkeltaub et al, 2015bTurkeltaub et al, , 2016Weissman et al, 2020), (d) leachate generation and migration in landfills (Aharoni et al, 2017(Aharoni et al, , 2020, and (e) interactive remediation of contaminated sites (Dahan et al, 2017;Moshkovich et al, 2017;Levakov et al, 2019). Scientific and environmental implications from a number of these studies are presented here to demonstrate the capability to continuously monitor water flow and contaminant migration in the unsaturated zone.…”

Section: Insights From Direct Monitoring Of the Unsaturated Zonementioning

confidence: 99%

Vadose Zone Monitoring as a Key to Groundwater Protection

Dahan

2020

Front. Water

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Currently, monitoring programs designed for groundwater protection are mainly based on information from observation wells. This, however, creates a paradox, since identification of pollution in well water is clear evidence that the groundwater is already polluted. The poor state of contaminated aquifers all over the world, and the inability, in practice, to fully remediate contaminated aquifers suggest that groundwater monitoring alone has failed to provide the vital information required to prevent groundwater pollution. That said, groundwater pollution initiates on the land surface, and the contaminants have to traverse the unsaturated zone, long before reaching the water table. Therefore, monitoring programs that can provide real-time information on the hydraulic and chemical state of the unsaturated zone are essential for achieving early warnings of pollution potential and providing imperative protection from pollution hazards. Currently, most of the commercially available monitoring technologies are rather limited in their capability to provide early alerts of pollution processes taking place deep in the unsaturated zone, above the water table. Accordingly, monitoring technologies for the unsaturated zone have to be engineered as “off-the-shelf” commercial products, made available for application by practitioners in all fields of hydrology. From scientific and technological points of view, such ambitions are not out of reach. Yet they require an urgent call for a revolutionary shift in monitoring focus, from the groundwater itself to the unsaturated zone above it.

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“…Fungi are one of the best oil-degrading organisms; various studies have identified many fungal species capable of using crude oil as their sole source of carbon and energy (Viswanath et al .,2008 ;Shraddha et al ., 2011).However, the rate of biodegradation is influenced by several factors such as the type of microorganisms Physical and environmental factors such as nutrients, soil type, pH, temperature, moisture, oxygen water holding capacity and nutrient limitations (Aharoni et al, 2017;Avishai et al, 2017).This study the efficiency of fungi to degrade crude oil and the effect of time on this process.…”

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confidence: 97%

Biodegradation of Crude Oil Using Aspergillus species

2019

JBAH

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Biodegradation of crude oil is a process that utilizes the capability of microorganism to degrade toxic pollutant in the environment. In the present study, three fungal species were isolated from the soil contaminated with crude oil in the oil fields in Basrah. The fungal species belongs to the genus Aspergillus, which are A. flavus ,A .fumigatus and A .versicolar. Their ability to biodegrade crude oil was tested as single isolates for 15 and 30 days of incubation in the mineral salts medium,the results showed that the fungus A. flavus was the best, with biodegradation ability reaching 60% in 15 days and 80% in 30 days .

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Application of vadose-zone monitoring system for real-time characterization of leachate percolation in and under a municipal landfill

Cited by 42 publications

References 42 publications

Framework, method and case study for the calculation of end of life for HWL and parameter sensitivity analysis

Framework, method and case study for the calculation of end of life for HWL and parameter sensitivity analysis

Vadose Zone Monitoring as a Key to Groundwater Protection

Biodegradation of Crude Oil Using Aspergillus species

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