Current Flow Articles | Environmental XPRT

NEFCO density current Baffle design

The study was originally conceived to evaluate the performance of the NEFCO Stamford Baffle design and several variations on that design to better understand the parameters that affected baffle performance. To that end, the plan was straightforward. The first step was the simulation of a 70-ft diameter clarifier. This clarifier would serve as the test bed to calculate the predicted effectiveness ...

Apr. 1, 2011

By NEFCO, Inc.

Oil droplets and solid particles removal using circular separator with inclined coalescence mediums: comparison between co-current and counter-current flow

This research investigated the effects of co- and counter-current flow patterns on oil-water-solid separation efficiencies of a circular separator with inclined coalescence mediums. Oil-water-solid separations were tested at different influent concentrations and flowrates. Removal efficiencies increased as influent flowrate decreased, and their correlationship can be represented by power ...

Sep. 1, 2010

By IWA Publishing

HCL System Exceeds Current Regulations

Chemron manufactures high-quality specialty chemicals and surfactants for personal care products, industrial, institutional, oil field, mining, coatings, lubricants and water treatment. Some of the operations result in the creation of hydrochloric acid with high variable rates. As expressed by Bill Frost, of Chemron: “Chemronmaintains a strong environmental commitment, which views regulations as ...

Sep. 1, 1990

Impact of urban WWTP and CSO fluxes on river peak flow extremes under current and future climate conditions

The impact of urban water fluxes on the river system outflow of the Grote Nete catchment (Belgium) was studied. First the impact of the Waste Water Treatment Plant (WWTP) and the Combined Sewer Overflow (CSO) outflows on the river system for the current climatic conditions was determined by simulating the urban fluxes as point sources in a detailed, hydrodynamic river model. Comparison was made ...

Jun. 21, 2013

By IWA Publishing

Influence of wave and current flow on sediment-carrying capacity and sediment flux at the water–sediment interface

In nearshore waters, spatial and temporal scales of waves, tidal currents, and circulation patterns vary greatly. It is, therefore, difficult to combine these factors’ effects when trying to predict sediment transport processes. This paper proposes the concept of significant wave velocity, which combines the effects of waves, tides, and ocean currents using the horizontal kinetic energy ...

Sep. 29, 2014

By IWA Publishing

Measuring the Dispersion Coefficient with Acoustic Doppler Current Profilers

Abstract: A method is evaluated for estimating the longitudinal dispersion coefficient K from velocities and bathymetry measured with an acoustic Doppler current profiler #1;ADCP. If shear dispersion controls the mixing, the dispersion coefficient can be estimated from measurements of velocity and depth in a cross section. The dispersion coefficient has typically been measured by costly and ...

Aug. 1, 2007

By Teledyne RD Instruments

Current Trends in Environmental Noise Monitoring in Europe

Introduction This paper briefly describes the state of the art of environmental noise monitoring development in Europe, including the needs, standards, legislation, data, technology, techniques and tools. This paper will concentrate on the following areas: • How Imagine and the development of ISO 20906 and ISO 1996 affect noise monitoring systems • The need and role of professional ...

Jan. 1, 2005

By Brüel & Kjær Sound & Vibration Measurement A/S

European waters - current status and future challenges - a synthesis

The Europe 2020 strategy is the European Union's strategy for economic growth in Europe over the next decade. This strategy envisages the development of a 'greener', more environmentally friendly economy in Europe. Sustainable water management is a critical element of this green economy because healthy and resilient ecosystems provide the services needed to sustain human well‑being and our ...

Nov. 26, 2012

By European Environment Agency (EEA)

Researchers: Current global groundwater recharge models inaccurate

A large-scale analysis of existing water resource models used around the world has found some key processes are missing, which means estimates of water availability could be wrong and cannot be reliably used for making water management decisions. The international team of scientists found that important climate change impact models are wrong in some areas. One finding was that groundwater ...

May 17, 2017

By Fluence Corporation

Current Trends in Modelling Water Distribution Systems

Untitled Document Hydraulic Modelling is emerging from the infrastructure planning offices of our water utilities, where it continues to play a vital role in optimising capital investment projects, to take a ...

Jan. 1, 2004

By Innovyze

Current Trends in Environmental Noise Calculation Software in Europe

Introduction This paper briefly describes the state of the art of development of environmental noise calculation software in Europe, concentrated on the following areas: • The Harmonoise and Imagine projects and the Good Practice Guide on Strategic Noise Mapping • The role of combining measurements and calculations for more flexible problem solving • Uncertainty: qualitative methods ...

Jan. 1, 2005

By Brüel & Kjær Sound & Vibration Measurement A/S

The HogMag Eddy Current Separator - Metal Recovery with Ease

Why a HogMag? To benefit the customer and the environment the HogMag Eddy Current Separator is fitted with energy saving motors which generates a higher level of speed being achieved increaseing productivity, reducing maintenance and operation costs and improving overall up to 100% metal recovery depending on material. What is A HogMag Eddy Current Separator? ...

Jun. 10, 2015

By EcoHog Ltd

Acoustic Doppler Current Profiler measurements near a weir with fish pass: assessing solutions to compass errors, spatial data referencing and spatial flow heterogeneity

There has been an increasing interest in the use of Acoustic Doppler Current Profilers (ADCPs) to characterise the hydraulic conditions near river engineering structures such as dams, fish passes and groins, as part of ecological and hydromorphological assessments. However, such ADCP applications can be limited by compass errors, obstructed view to navigation satellites, frequent loss of ...

Nov. 18, 2015

By IWA Publishing

Exothermic reaction induced by high-density current in metals: possible nuclear origin

Since 1989, many experimenters worked on low-energy nuclear reactions (LENR). They face both an experimental and a theoretical dilemma: how to design simple and convincing experiments in a complex system and if the phenomenon has a nuclear origin, why do they observe no radiation. A rather simple water mass flow calorimeter was designed to study this phenomenon under different experimental ...

Jan. 3, 2006

By Inderscience Publishers

Calibration of The LISFLOOD Model For Europe: Current Status And Way Forward

The hydrological model LISFLOOD model forms the core of the European Flood Alert System (EFAS) and is used for impact studies to evaluate the effect of changes in land use and climate on the hydrological behaviour in catchments across Europe. The accuracy of the model predictions depends on the ability of the model to capture the dominating hydrological processes that transfer precipitation into ...

Jan. 1, 2005

Estimating longitudinal dispersion in rivers using Acoustic Doppler Current Profilers

Abstract The longitudinal dispersion coefficient (D) is an important parameter needed to describe the transport of solutes in rivers and streams. The dispersion coefficient is generally estimated from tracer studies but the method can be expensive and time consuming, especially for large rivers. A number of empirical relations are available to estimate the dispersion coefficient; however, ...

Feb. 20, 2010

By Teledyne RD Instruments

BioLargo (BLGO) is a Bargain at Current Levels - Green Technology Investments

BioLargo Inc. (OTCQB: BLGO), developer of Nature's Best Solution - a proprietary version of iodine - formed to help solve a variety of common problems around the world, appears to be a bargain at current levels. From pet supplies like those sold at PetSmart Inc. (NASDAQ: PETM) to household brands like those sold by Clorox Company (NYSE: CLX), the company is targeting a number of different ...

Aug. 22, 2012

By Biolargo, Inc.

Rotork, Redefining Flow Control

In 2010, when the well known international actuator manufacturer Rotork had its last cover story in Valve World magazine, the focus was on the company’s German office in Melle and the plans and developments for that location. In Rotork’s 2012 cover story, we shifted the focus to the Head Office in Bath, UK, and spoke to Mr. Richard Hudd, Marketing Director for Rotork Fluid Systems, ...

Dec. 1, 2012

By Rotork plc

Coupled solution of oil slick and depth averaged tidal currents on three-dimensional geometry of Persian Gulf

Abstract: In this paper, simulation of oil spill due to tidal currents in Persian Gulf is performed by coupled solution of the hydrodynamics equations and an equation for convection and diffusion of the oil. The hydrodynamic equations utilized in this work consist of depth average equations of continuity and motion in two dimensional horizontal planes. The effect of evaporation is considered in ...

Feb. 7, 2006

By Center for Environment and Energy Research & Studies (CEERS)

A new strategy for determination of current efficiency during electro-oxidation of aromatic compounds in a packed-bed system

The electro-oxidation of aromatic compounds in 4,4′-diaminostilbene-2,2′-disulfonic (DSD) acid wastewater on IrO2–Ta2O5/Ti anodes was studied. The current efficiency was evaluated in terms of chemical oxygen demand (COD) by introducing a new factor, the fraction of the Faradaic current to the total cell current (β) through the network analysis of packed bed electrode system (PBEs). Experimental ...

Jan. 1, 2011

By IWA Publishing

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