Groundwater Asset Management in Mining
Mike Deed is the author of an interesting article on Groundwater Asset Management in Mining that appeared in the December issue of Geodrilling International.
The article focuses on the importance of implementing a regular maintenance programme to control borehole contamination and keep systems running efficiently.
Mines rely heavily on groundwater sources and the quality, yield and flow rate of the extracted water have both operational and regulatory implications. The problem of mineral and bacterial contamination in groundwater sources can cause serious system failure, increase costs and have legal and environmental consequences.
A case study of the Telfer gold-copper mines in Australia forms part of the article and includes information on the results of Newcrest’s well-field management process and the difference using BoreSaver made to the efficient operation of their wells.
Inflatable Packers for the Water Well Developments and Maintenance
Replacement Inflatable Packers and Elements manufacture inflatable packers for the water well, borehole development and maintenance, including high pressure inflatable packers for hydro fracturing and block caving procedures.
IEG multi level sampling well (MLSW) case study - IEG Technologie GmbH
The MLSW-system is used for the recovery of multiple high-quality samples of soil-gas and groundwater from numerous isolated horizons in a single standard borehole. The system is also used to accurately delineate contamination profiles in three dimensions, which is vital or the design, installation and monitoring of remediation systems. MLSWs also can be used for activly dispersing substances in a vertical profil into the groundwater to enhance natural attenuation or to enhance various remediation technologies....
Technical Bulletin: Multilevel Sampling
The topic of this CL:AIRE Technical Bulletin is multilevel sampling systems for characterising contaminated groundwater. Contaminated groundwater can present considerable problems for landowners: it can occur at significant depth, sources of the contamination are not often obvious, it can migrate from one property to another, and groundwater flow directions can be altered due to seasonal variations or by pumping. In order to assess liability associated with contaminated groundwater, land owners must be able...
The Benefits of Integrated Environmental Data Management - a Waste Industry and Regulator ...
This paper presents the benefits of using integrated data management software to improve the efficiency of waste operations, and the flow of information between operators, regulators and any other stakeholders such as local communities. Further benefits such as automatic reporting of key performance indicators, carbon emissions and benchmarking companies are also discussed. Waste management companies including landfill and incinerator operations are under increasing pressure to monitor operational and environment...
A Chemical Dynamics Model for CAH Remediation with Polylactate Esters.
ABSTRACT: The polylactate esters of sorbitol, xylitol and glycerol are a class of new chemical compounds that slowly release lactic acid into groundwater. The lactic acid is biotransformed into pyruvic acid and subsequently into acetic acid releasing hydrogen in both steps. The hydrogen is used by naturally occurring dechlorinating bacteria to reduce PCE to ethene by way of TCE, DCE and VC. A chemical mechanistic model of all of the reactions involved including absorption and desorption of all the chemical...
Application of Advanced Modelling Tools to Evaluate Uncertainty in Modelling Predictions
With any modelling prediction there is a degree of uncertainty that corresponds to the uncertainty in defining hydraulic and chemical parameters spatially throughout the model domain. With geologic investigations we must interpolate between point information (borehole logs) to define continuous spatial properties through the model area. In addition, many parameters such as effective porosity and dispersivity are difficult (and often impractical) to quantify in the field.
Visualizing Environmental Data using ArcView and EQuIS
Performing advanced analysis and visualization of environmental and geologic data can be done easily and quickly using the EQuIS ArcView GIS Interface. A consortium comprised of EarthSoft, RockWare, and ESRI has recently developed tools to facilitate better and more efficient use of environmental and geologic data than has heretofore been possible. This solution involves the integration of several industry-standard applications such as ArcView, EVS, GMS, LogPlot, RockWorks, and more to produce a world-class,...
Integration of Subsurface Data Management and GIS to Facilitate Model Calibration
Abstract The development of numerical codes, as well as pre- and post-processors to support these codes, has made the discipline of groundwater modelling increasingly more automated and efficient. The value of such modelling is reliant on the site-specific data used to build and calibrate the models. The integration of EarthSoft`s EQuISÒ Geology and any of several popular modelling environments results in a data management and analysis system that is more complete than the modelling system alone. Water level...
State-wide collection of site remediation data in support of environmental quality objectives
Geographic Information Systems (GIS) hold great potential as a tool for managing environmental site remediation data. While noting the location of contaminated sites in GIS is commonplace, GIS has played only a minor role in review and analysis of chemical data gathered during an investigation or monitoring activity. The New Jersey Department of Environmental Protection Site Remediation Branch (NJDEP SRP) has undertaken a project making the use of GIS for this purpose a reality within their organization. Through...
An integrated Approach to Groundwater Protection Using Modelling and GIS, Groundwater in a ...
A pilot study for delineating wellhead protection areas was undertaken in Cacapava, Brazil, which integrated three-dimensional capture zone modelling with available groundwater and contaminant-source databases, using a four-step process. A contaminant source inventory was developed and each source was ranked based on its potential impact. Next, the thickness of the unsaturated zone and the surficial soil characteristics were used to define regions of higher and lower groundwater vulnerability based on travel time...
Introduction: Co-metabolism is one form of secondary substrate transformation in which enzymes produced for primary substrate oxidation are capable of degrading the secondary substrate fortuitously, even though the secondary substrates do not afford sufficient energy to sustain the microbial population. An emerging application involves the injection of water containing dissolved primary substrate (e.g. methane, toluene) and oxygen into ground water to support the co-metabolic breakdown of targeted organic...
Introduction Fracturing is an enhancement technology designed to increase the efficiency of other in situ technologies in difficult soil conditions. The fracturing extends and enlarges existing fissures and introduces new fractures, primarily in the horizontal direction. When fracturing has been completed, the formation is then subjected to vapor extraction, either by applying a vacuum to all wells or by extracting from selected wells, while other wells are capped or used for passive air inlet or forced air...
Water Quality Models
` In order to determine the impacts of a particular discharge on ambient water quality, it is usually necessary to model the diffusion and dispersion of the discharge in the relevant water body. The approach applies both to new discharges and to upgrading of existing sources. This note provides guidance on models that may be applicable in the context of typical Bank projects.` Introduction Mathematical models can be used to predict changes in ambient water quality due to changes in discharges of wastewater. In...
Public Involvement in Pollution Management
Formal public involvement at the scoping and draft review stages is part of the Environmental Assessment process and is usually required for industrial projects. However, the wider use of participatory approaches in World Bank pollution management projects is still evolving. Public involvement in setting priorities for pollution management is no yet common although there is evidence that an informed public has an influence on reducing pollution. In the development of projects which have a pollution management...
Horizontal Wells - Technology Overview
Horizontal well technology has been incorporated into many current environmental remediation applications (and associated contaminants), such as in situ bioremediation, air sparging, vacuum extraction, soil flushing, free product recovery, etc. Ac cording to information reviewed, this technology is most applicable to sites with relatively shallow soil and/or groundwater contamination, and can potentially enhance remediation efforts at sites low hydraulic conductivities. Types of horizontal wells include both...
Air Sparging - Technology Overview
Air sparging involves injecting a gas (usually air/oxygen) under pressure into the saturated zone to volatilize groundwater contaminants and to promote biodegradation in saturated and unsaturated soils by increasing subsurface oxygen concentrations. Vola tilized vapors migrate into the vadose zone where they are extracted via vacuum, generally by a soil vapor extraction system. The term biosparging is sometimes used interchangeably with air sparging to highlight the bioremediation aspect of the treatment process...
Crossflow Membrane Filtration High-Purity Water Systems
INTRODUCTION As the electronics industry continues to provide us with such products as high resolution television, notebook size portable computers and cars with automatic navigation systems, it becomes necessary to produce semiconductors with finer device geometries to allow for efficient placement of more circuits per a given area. This requires increased control of a semiconductor`s material characteristics by eliminating impurities in the circuit material or on its surface. Likewise, amazing drugs such as...