v-fold Articles

  • Examining the benefits of HDPE geomembrane

    Comparing various geomembranes for your next geosynthetic application? Don’t overlook high-density polyethylene (HDPE) geomembrane. HDPE has been in use for decades and during that time a number of studies have been conducted to test its longevity and ability to meet environmental sustainability project requirements. Here, we explore some of those studies to examine the benefits of HDPE ...


    By Agru America, Inc.

  • Oil Sampling Best Practices (Part 2)

    Understanding Dynamic Particle Equilibrium in Closed Loop Systems Dynamic Equilibrium Condition (DEC) is defined as a steady state condition where the normal wear rate in a machine results in no net gain or loss of particles. ...


    By Spectro Scientific

  • Sludge Blanket Level Detection – making new process opportunities possible

    Much Pulsar's Self-Cleaning Viper Sludge Sensor of the demonstrating the effective maintenance-free solution. discussion around the way we deal with sewage sludge – the way it is moved around the process, the bellmouth valves and decant processes, the downstream treatment of the liquors, important issues around TOTEX and discharge Compliance, plus more recently the ...

  • The ‘ins and outs’ of air quality monitoring

    The National Institute for Health and Care Excellence (NICE) recently issued draft guidance on ‘Air pollution - outdoor air quality and health.’ In the following article Jim Mills, Managing Director of Air Monitors Ltd, explains why there will need to be more funding for monitoring if the mitigation measures mentioned in the guidance are to be implemented effectively. Jim also ...


    By Air Monitors Ltd.

  • Product stewardship – recycling’s little helper

    Like many veteran recycling professionals, I have faced serious challenges in making the wish of recycling all materials come true.  Although paper, cardboard, cans and bottles have ready markets and collection infrastructure; computers, mattresses and other items did not.  They were the problem items that went into dumpsters because costs and lack of mechanism gave them little chance ...

  • Does your facility need Zero Liquid Discharge Technology?

    If your industrial facility discharges its waste into deep wells, streams, sewers to publicly owned treatment works (POTWs), and/or other waterways, it is likely there are some types of regulations on discharging the waste. With an increasing push toward environmental protection, many industrial facilities and effluent regulators are strengthening strategies to reduce industrial process waste. ...


    By SAMCO Technologies, Inc.

  • New ways for Metal Recycling

    REWAVE XRF 3-way-sorting in innovative  “Free-Fall”-design Recycling of metal and aluminium knows no limits because it can be remelted as scrap indefinitely. Metals, however have to be separated from non-metallic impurities, and different metals have to be sorted in pure fractions to be used as secondary raw materials substituting primary resources. Especially when it ...

  • New Bird Netting Means “No Vacancy” for Crows at Hotel - Case Study

    Springhill Hotel in Temecula, California was having a problem with black crows. The birds were building nests, leaving bird droppings on and around the hotel, and creating considerable noise, which disturbed hotel guests. Installation of Bird B Gone Heavy Duty Bird Netting. Issues to be addressed: Prevent large numbers of crows from congregating around the hotel property. The ...


    By Bird-B-Gone, Inc.

  • Gavin Russell, Sales Engineer at TOMRA Sorting Recycling, is sharing key considerations on managing MRF upgrades

    Gavin Russell, Sales Engineer at TOMRA Sorting Recycling, analyses the rising volume of MRF upgrades, considers the rationale driving such decisions, and shares some ideas on how to manage a successful upgrade. Material quality issues Whilst material quality is a primary factor in any evaluation of an MRF’s performance, this can be influenced by a range of ...


    By TOMRA Sorting (TITECH)

  • Secondary Oil Containment at US Army Corps of Engineers - Big Bend Dam - Case Study

    Big Bend Dam takes its name from the unique bend in the Missouri River seven miles upstream from the dam. Construction of the dam began in 1959 and the embankment was completed in July 1963. Big Bend dam is 95 feet (29 m) high and 10,570 feet (3,220 m) in length. Power generation began at the facility in 1964 and the entire complex was completed by 1966. The hydroelectric plant generates ...


    By Albarrie Canada Limited

  • The Clog Blog

    Clogging and over pressuring are definitely problematic for Liquid Chromatography columns. Back in 2005 John Dolan’s sage advice to chromatographers to make an LC column last forever was simple, “Never open the box!” As John pointed out, this is not practical and I have to agree. But as an LC column manufacturer I have seen remarks from customers regarding clogging as though it ...


    By Restek Corporation

  • Using Electromagnetic induction to characterize soils - Case Study

    Electrical conductivity measurements have been used for years to determine salinity and moisture in soils. Probes were inserted directly into the soil to determine how well the soil conducted an applied current. This process was slow and labor-intensive and was usually reserved for scientific studies. A more recent technique for measuring conductivity is electromagnetic induction (EM), a ...


    By Geonics Limited

  • F4 Spill In Situ Bioremediation Applications

    F4 Completed an in situ water bioremediation program of Bio-ReClaim in northern Alberta; a pipeline leaked crude oil over a 14 hectare area in muskeg. Alberta Environment (AEP) allowed the in situ water application of Bio-Reclaim by F4 Environmental. Keeping in mind the application was performed without any ground disturbance and extremely cost effective compared to the ...


    By F4 Environmental Inc.

  • Title V Compliance

    Title V of the Clean Air Act Amendments assimilates all the contents of a facility's state operating permit into one binding document, in an effort to simplify permit compliance certification. However, submittal of annual compliance certification is a labor-intensive process that places significant pressure on EH&S personnel responsible for ensuring that a facility meets all the conditions in its ...

  • Renaissance of paper models and folded plate structures in glass

    This paper presents the development of glass folded plate structures. Glass will not only be used as a transparent covering but as a load-bearing element for the whole structure. A complete outline ranging from the architectural approach including simple paper models to structural analysis will be presented. The structural concept and its functional characteristics will be confirmed by finite ...


    By Inderscience Publishers

  • Oxidation v. reduction: how to decide?

    Is in-situ chemical oxidation (ISCO) or in-situ chemical reduction (ISCR) the best option for your site? What factors should be considered to make such a decision? Many chlorinated hydrocarbon compounds (CHCs) can be degraded via oxidative or reductive processes. Accordingly, various ISCO technologies using oxidizing agents such as hydrogen peroxide (Fenton’s chemistry), permanganate, ozone or ...


  • Software review: dips v.5.0

    Dips (5.0) for WINDOWS is the latest version of the brawny steregraphic projection program from Roescience'. It comes packed with enoough functionality to provide solutions to the most complex problems in the fields of Earth Sciences or Engineering requiring the analysis of orientation based data. Dip has obviou applications in the fields of: Stability/instability investigations in mining or ...


    By Rocscience Inc.

  • A folded wedge model for determination of true stratigraphic thickness in directional wells

    For exploration and development the geologists and engineers try to know the true stratigraphic thickness (t). The monoclinal and folded bed models are published methods for t calculation. Both models assume parallel beds which can lead to significant deviations. In order to calculate the values of t considering the effects of both folding and stratigraphic variation we propose the 'folded wedge ...


    By Inderscience Publishers

  • When to Hold and When to Fold - Considerations When Contemplating a Job Change

    An environmental professional recently called me for career advice on making a job change. He has a secure job working for a federal agency, but was bored and wanted to work for an organization "with a corporate culture that truly is in sync with sustainable development." Should he make the move, and if so, which are the best companies? I answered, "No, wait until the economy improves, build both ...

  • Power-fold actuator noise diagnostics using statistical envelope analysis

    A good correlation between subjective evaluation and objective test is a key for any machine condition monitoring and fault diagnosis process. This paper proposes a statistical envelope analysis approach for product quality control where Fourier spectrum is selected as diagnosis analysis characteristics. The acceptance amplitude envelope is statistically calculated from the measured random ...


    By Inderscience Publishers

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