recirculating well Articles

  • Horizontal Recirculation Wells Remediate Fuel Oil Impacts

    Catering to the unique needs of the client and working hand-in-hand with the consultant, Directional Technologies approached a challenging remedial situation with flexibility and a new approach to re-task a horizontal injection well system to horizontal recirculation wells. Directional Technologies invites you to read another case study explaining how a project benefited from decades of ...

  • Low recirculation rate evaporators

    Abstract Fin coil evaporators with enhanced internal tube surfaces allow for optimum performance with a minimal overfeed rate. Reducing the overfeed rate requiresless pumping power and smaller line sizes to the evaporator. Additionally, less compressor power is required for the same refrigeration capacity because the wet suction line pressure drop is reduced. Lower compressor power results ...


    By Evapco Inc.

  • Pilot-scale study of powdered activated carbon recirculation for micropollutant removal

    Adsorption onto powdered activated carbon (PAC) is a promising technique for the removal of organic micropollutants (OMPs) from treated wastewater. To enhance the adsorption efficiency, PAC is recycled back into the adsorption stage. This technique was examined in pilot scale in comparison to a reference without recirculation. Coagulation with Fe3+ was carried out simultaneously to adsorption. ...


    By IWA Publishing

  • Chemical-Free Treatment of Recirculating Water Using Pulsed-Power

    Untitled Document Regulatory pressures and economic considerations require industry to become cleaner, more efficient, and more environmentally benign. Such operating principles advance not only ...


    By Dolphin WaterCare

  • Enhancement of denitrification in a down-flow hanging sponge reactor by effluent recirculation

    A down-flow hanging sponge reactor, constructed by connecting three identical units in series, was applied to the treatment of artificial wastewater containing phenol and ammonia under high salinity conditions (10.9 g-Cl−/L). The theoretical hydraulic retention time (HRT) of each unit was 4 h (total HRT = 12 h). To enhance denitrification by effluent recirculation, the effluent ...


    By IWA Publishing

  • Comparing the Performance of Recirculating Cyclones Applied to the Dry Scrubbing of Gaseous HCI with Hydrated Lime

    Recirculating cyclone systems, combining a numerically optimized reverse flow gas cyclone (RS_VHE geometry) with a straight-through cyclone concentrator, were employed as reaction chambers for the dry scrubbing of gaseous hydrogen chloride with solid hydrated lime particles. The performance of this technology was tested at laboratory scale with two differently sized RS_VHE cyclones (0.020 ...

  • Characteristics of three-phase internal loop airlift bioreactors with complete gas recirculation for non-Newtonian fluids

    Hydrodynamic and gas–liquid mass transfer characteristics, such as liquid velocity, gas holdup, solid holdup and gas–liquid volumetric mass transfer coefficient, in the riser and downcomer of the gas–liquid-solid three-phase internal loop airlift bioreactors with complete gas recirculation for non-Newtonian fluids, were investigated. A mathematical model for the description of flow behavior and ...


    By Springer

  • Case study - Ozone sparging closure of an industrial VOC spill site adjacent to a water supply well site

    Description An undocumented surface spill at an active manufacturing facility located adjacent to a public water supply well field released chlorinated volatile organic compounds (PCE, and its breakdown products: TCE, c-DCE, and VC) into soils and groundwater.  The driver for site cleanup was three water supply wells located 200 feet downgradient of the site bounds.  The chosen ...

  • Parameters for a simple empirical model of building influenced dispersion based on field and wind-tunnel experiments

    Flow and dispersion around isolated obstacles, representative of those found in urban areas, is examined both in the field and in the wind tunnel. The experimental results are used to derive parameters for a simple empirical model for the estimation of concentrations in the recirculation region of isolated obstacles. Concentrations are estimated for a fully entrained plume as well as for partial ...


    By Inderscience Publishers

  • Application of partially submerged bioreactor landfill for leachate management in the tropics

    This research investigated the effect of leachate recirculation and storage operation in tropical landfill. Four lysimeters were operated under conventional landfill operation, leachate re-circulation, leachate storage with re-circulation and internal storage modes. Organic waste degradation, leachate quantity and characteristics and well as methane gas from each lysimeter were compared. Leachate ...


    By Inderscience Publishers

  • Photo-degradation of butyl parahydroxybenzoate by using TiO2-supported catalyst

    The present work evaluates the potential of the photocatalysis (PC) process for the degradation of butylparaben (BPB). Relatively high treatment efficiency was achieved by comparison to photochemical process. Prior to photocatalytic degradation, adsorption (AD) of BPB occurred on the titanium dioxide (TiO2)-supported catalyst. AD was described by Langmuir isotherm (KL ...


    By IWA Publishing

  • Anaerobic biodegradability of fish remains: experimental investigation and parameter estimation

    The generation of organic waste associated with aquaculture fish processing has increased significantly in recent decades. The objective of this study is to evaluate the anaerobic biodegradability of several fish processing fractions, as well as water treatment sludge, for tilapia and sturgeon species cultured in recirculated aquaculture systems. After substrate characterization, the ultimate ...


    By IWA Publishing

  • Studying street geometry influence in PM10 concentration

    This paper intends to show the influence of street geometry in particle concentration emitted from traffic source, on a busy street of Barreiro City, Portugal. FLUENT software was used to simulate particle dispersion, air flow and turbulence in the street. Buildings and road characteristics were considered, as well as winter and summer most predominant meteorological conditions. Also, particle ...


    By Inderscience Publishers

  • Passively Enhanced in Situ Biodegradation of Chlorinated Solvents.

    INTRODUCTION Harding Lawson Associates (HLA) conducted a field demonstration to evaluate in situ enhanced anaerobic biodegradation of chlorinated solvents using Hydrogen Release Compound (HRC). The technology is designed to enhance the natural biodegradation process for a more rapid and complete degradation of the organic contaminants to non-toxic compounds (e.g., ethylene). This paper presents ...


    By REGENESIS

  • Using LC50 for metals as Water Quality indicator

    One of the causes of low yields or productive deficiencies, in the stage of production of fresh water, more gifts in the aquaculture industry of salmon in Chile, has its origin in the presence of naturally occurring metals, both in bodies of fresh water as in deep wells. The toxicity of metals such as Aluminum and Copper, others, has been described previously and their presence in waters of our ...


    By Aquaknowledge

  • Granada Eco-Center: Technology at the service of efficient material recovery

    Granada Eco-Center, in Alhendin (Granada), with a nominal capacity of 450,000 tons per annum, is totally automated and is one of the leading facilities in waste recycling at the national level, and had a 10.8% waste recovery rate on inputs last year. ...


    By TOMRA Sorting GmbH.

  • DNAPL in Clay Formation

    PROJECT BACKGROUND At a manufacturing site located in Cookeville, TN, on and offsite soil (tight clays) and groundwater contaminated with chlorinated solvents, were discovered as the result of a Phase I and a Phase II investigation. The client entered the State of Tennessee Voluntary Clean-up Oversight and Assistance Program (VCOAP), which resulted in an informal focused feasibility study to ...


    By REGENESIS

  • Understanding Pump Cavitation

    Cavitation is a major problem in the chemical industry because it affects a basic tool, the centrifugal pump. A sudden increase in the velocity of the pumped liquid reduces the inlet pressure, sometimes below the vapor pressure.The result is formation of gas and bubbles. Detecting the signs of cavitation, and correctly identifying and understanding the type of cavitation present, can help an ...

  • Gas Fired Oven

      INDUSTRIAL GAS FIRED OVEN   CONSTRUCTION An industrial Gas Fired Oven is typically of steel construction, comprised of inner and outer shells of sheet steel panels, separated by 4” thick, 6 lb/ft3 density mineral wool insulation.  The panels are constructed as to minimize metal-to-metal contact between inner and outer shells and reduce heat flow from ...


    By Epcon Industrial Systems, LP

  • The Application of Ultraviolet Germicidal Irradiation to Control Transmission of Airborne Disease: Bioterrorism Countermeasure

    Synopsis Bioterrorism is an area of increasing public health concern. The intent of this article is to review the air cleansing technologies available to protect building occupants from the intentional release of bioterror agents into congregate spaces (such as offices, schools, auditoriums, and transportation centers), as well as through outside air intakes and by way of recirculation air ...


    By E-CO

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