well screen Articles
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Time-Tested Advantages of Horizontal Wells
Wells are wells are wells, right? Both conventional vertical wells and directionally drilled horizontal wells have a screened casing that is connected to solid riser casing which leads to the ground surface. Groundwater or soil vapor is drawn through a well screen to remove contaminants. Remediation agents such as air, bioamendmnents or potassium permanganate are injected through a well screen to ...
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Horizontal Soil Vapor Extraction Wells
As part of a Corrective Action Plan (CAP) submitted to NYSDEC, a consultant selected Horizontal Soil Vapor Extraction Wells (HSVE) to expand an on-site vapor extraction system in New York. Directional Technologies worked with the consultant on the horizontal well screen design and well layout of three (3) HSVE wells, spaced 50-feet apart, and constructed with 4-inch Schedule 80 PVC materials. Due ...
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Modeling of radial well lateral screens using 1D finite elements
A water supply system including radial wells (RWs) is usually large, extending several tens of kilometers horizontally and is dozens of meters deep. An RW is a vertical shaft with lateral screens, which radially penetrate the soil. A large and complex 3D finite element (FE) mesh also needs to include laterals with cross-sectional dimensions measured in centimeters. An adequate representation of ...
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Analytical model for uni–directional flow passive soil vapour extraction system
An analytical one–dimensional model has been developed to examine the uni–directional barometric pumping in passive Soil Vapour Extraction (SVE) system. The model is applicable to a special case in which a radial flow field is insignificant. The system considered contains two unsaturated zone layers, an upper contaminated low permeability layer and a lower high permeability layer contains a well ...
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Extraction well design for DNAPL recovery.
The potential for downward migration of dense nonaqueous phase liquid (DNAPL) into deeper portions of a saturated hydrogeologic unit has important implications for successful groundwater remediation. Little information has been published regarding the design of extraction wells that allow DNAPL recovery without simultaneously creating a conduit for cross contamination by vertical migration ...
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Water Active: Borehole Management in Civil Engineering Projects
Groundwater wells are common to many civil engineering schemes and their operational performance can play a crucial role in the successful delivery of a project, whether used for construction dewatering, alternative water supplies for facilities or any other application , the well performance must be optimized and high levels of operational efficiency and service availability achieved. A ...
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Lufft ConfigTool .NET grows and flourishes
Lufft is constantly updating its product line with sensors that integrate numerous new features. Therefore, software and tools must be kept up to date to support these new possibilities. We at Lufft’s Software-Development department are constantly involved to implement these features and honor the customers requests. In the end, even the best sensor needs a tool to be configured and ...
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Several natural indicators of radial well ageing at the Belgrade Groundwater Source, part 2
From 2005 to 2009, research was conducted at the Belgrade Groundwater Source (BGWS) to investigate the process of clogging of wells with horizontal lateral screens (radial wells). The clogging process was monitored via the kinetics of the increase in hydraulic losses at the laterals. A correlation of this process with the redox potential, the iron concentration in water, and the microbial ...
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Remediation of Free Product with Horizontal Bioremediation Systems - Case Study
Project Location: Northern New York Client: Private Corporation – Petroleum Distribution Center Contamination: Gasoline Site Size: 10+ Acres Project Description: Seeking to excavate a trench to install an underground pipe, the client’s contractor severed a buried, and greatly mislocated, 10-inch gasoline header. The header was under significant head pressure, being fed by a ...
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Key Elements of a Successful Horizontal Remediation System
Environmental remediation professionals around the country (and internationally) are rapidly learning that Horizontal Remediation Systems are an essential “tool in their remediation toolbox”. When designed and executed by experienced horizontal environmental drilling experts, Horizontal Remediation Systems can be extremely effective at achieving rapid site closure compared to vertical ...
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Corrective action at a hazardous waste unit
Troy Risk performed a RCRA Corrective Action at a closed hazardous waste landfill for a multinational landfill company. The work involved inspection and cleaning of two 85-foot leachate risers. A leachate riser is a stack of 4-foot diameter concrete pipe sections, which provide a passage to the bottom of the hazardous waste landfill. The riser provides access to pumps and electronic leachate ...
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Investigating cross-contamination of aquifers
Shallow aquifers can cross-contaminate deeper aquifers through penetration of an intervening aquitard, via sandy intervals in the aquitard, along well casings, across long well screens, or around aquitard pinchouts. Distinguishing among these potential pathways requires the use of evaluation tools that may support or eliminate certain pathways. These tools include groundwater gradient and ...
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Geotextiles in Construction Dewatering
Woven geotextiles work wonders in dewatering applications as wraps around well screens and sump pit screens. The textile can be sewn into sleeves or tubes to be slid over the well screen or sump pit framework. This technique allows the user to compensate for well screens with slots that are too large or for sump pit piping with large perforations. By adding the geotextile sleeves the user ...
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Vibrating Screen Separators: Maintenance and Downtime Issues
A vibrating screen separator is a big investment for any operation and an important part of your overall process. A good screening machine will be able to reliably meet your production goals while keeping your overhead costs to a minimum. The potential for maintenance and downtime are important considerations to factor into a new vibrating screen purchase. Here are a few things to think about. ...
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Columbia River Gets a Vertical Fish Screen - case study
The Columbia River is huge and runs past deserts, towns, major cities and numerous recreation areas. It is a major fishery, as well. So this screen had to protect and exclude fish, handle natural and urban debris, and operate in a constricted space. We designed and installed large vertical fish screens with hoods. Now the irrigation canal is clean and clear of river debris. The fish are ...
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How to set up a groundwater monitoring test site
When it comes to groundwater monitoring, testing the water often requires the creation of a borehole at the test site to reach the water below. The process of creating a safe and secure site for everyone involved can sometimes be a lengthy process. The size of the borehole, which drill to use and the response zone are just a few of the considerations that will need to be taken into account ...
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Case study - Specialty spiral core winding
Location: Ohio Equipment: Adwest Technologies Regenerative thermal oxidizer (RTO) Manufactured in 1999; Refurbished 2016 5,000 scfm capacity Problem: A manufacturer of spiral cores for multiple products needed to economically control emissions. Their growth had resulted in increased emission tonnage and were nearing the limit without a control device. Like many manufacturers they had ...
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VC5 Vertebrae data in high definition - Case Study
SITE Confidential Site in South, FL CONTAMINATION Solvents OBJECTIVE One age old issue for proper site characterization is inaccessibility. Most sites have some type of building or structure in the way of completing an easy assessment. Often a building lies near or directly on top of a source of contamination where it matters most. Some buildings lend themselves to gathering limited data ...
By EN Rx, Inc.
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working principle of trommel screen
The shaftless trommel screen drum unit is mounted on the frame at an angle and is designed without a central shaft structure. The motor drives the pinion gear to rotate with the large gear of the drum or the chain and the gear on the drum. The motor drives the chain drive or the roller is placed on the two rollers, and the motor drives the roller to drive. The roller device rotates under the ...
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Implications of observed and simulated ambient flow in monitoring wells
The authors of this paper present compelling evidence that conventional monitoring wells act as vertical conduits whenever vertical hydraulic gradients are present (i.e., at most sites). Vertical flow within wells due to natural hydraulic gradients not only makes it impossible to accurately define the vertical distribution of dissolved contaminants within the aquifer, but it can transport ...
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