deep-bed Articles

  • Intrinsic kinetics for fixed bed bioreactor in hospital wastewater treatment

    Variation in hospital wastewater (HWW) pollutants and differences with municipal wastewater (MWW), make the use of biokinetic coefficients obtained from activated sludge in the MWW treatment unprofitable for designing, modeling and evaluation of biological processes for HWW treatment. Since this study was conducted to evaluate the performance and biokinetic coefficients of a fixed bed ...


    By IWA Publishing

  • Removal of arsenic from drinking water using modified fly-ash bed

    The removal of arsenic from drinking water by filtration through modified fly-ash bed is discussed. The preparation and characteristics of the bed material and the effects of different parameters like pH and the presence of other constituents are described. Various arsenic compounds in synthetic mixtures as well as drinking water samples containing arsenic have been investigated. The ...


    By Inderscience Publishers

  • Development of a packed-bed reactor for the recovery of metals from industrial wastewaters

    Affinity separation is becoming well established for the purification and recovery of metals from industrial wastewaters. Although the method has been successfully applied on a bench-scale, there is a need for reaction engineering studies to scale-up the process for use in large-scale wastewater purification and recovery of valuable metals. In this study, a pilot-scale packed-bed reactor has been ...


    By Inderscience Publishers

  • Reed bed systems for sludge treatment: case studies in Italy

    In recent years, reed bed systems (RBSs) have been widely considered as a valid technology for sludge treatment. In this study are presented results about sludge stabilization occurring within beds in four RBSs, situated in Tuscany (Italy). The results showed that stabilization of the sludge over time occurred in all RBSs, as shown by the low content of water-soluble carbon and dehydrogenase ...


    By IWA Publishing

  • Abutment scour in clear-water and live-bed conditions by GMDH network

    In the present study, the Group Method of Data Handling (GMDH) network has been utilized to predict abutments scour depth for both clear-water and live-bed conditions. The GMDH network was developed using a Back Propagation algorithm (BP). Input parameters that were considered as effective variables on abutment scour depth included properties of sediment size, geometry of bridge abutments, and ...


    By IWA Publishing

  • ANFIS-based approach to scour depth prediction at abutments in armored beds

    An accurate estimation of the maximum possible scour depth at bridge abutments is of paramount importance in decision-making for the safe abutment foundation depth and also for the degree of scour countermeasures to be implemented against excessive scouring. Most of the scour depth prediction formulae available in the literature have been developed based on the analysis of laboratory and field ...


    By IWA Publishing

  • Using Membrane Contactors For CO2 Removal To Extend Resin Bed Life

    In today’s economic environment when prof its are reduced due to rising costs, it is necessary to find ways to save time and money. City Public Service, ...


  • Effect of sponge volume fraction on the performance of a novel fluidized bed bioreactor

    A novel fluidized bed bioreactor (FBBR) was designed by integration of anaerobic granular activated carbon and aerobic sponge reactors. This FBBR was evaluated at different sponge volume fractions for treating a synthetic wastewater. Polyester urethane sponge with cube size of 1 × 1 × 1 cm and density of 28–30 kg/m3 with 90 cells per 25 mm was used as biomass carrier. The ...


    By IWA Publishing

  • The use of plastic media in a movable bed model to study sedimentary processes in rivers

    The use of plastic media was evaluated for modelling sedimentary processes in rivers using a movable bed model (MBM). From gradations within the range of 0.17–2 mm, the size of the thermoset plastic media was colour coded in order to better visualise complex flow processes. Equations developed by Engelund–Hansen and Schoklitsch were used to predict sediment transport and establish the type of bed ...


    By Inderscience Publishers

  • The effect of operational conditions on the hydrodynamic characteristics of the sludge bed in UASB reactors

    This work aims to evaluate the hydrodynamic properties of the sludge bed of Upflow Anaerobic Sludge Blanket (UASB) reactors based on its settleability and expansion characteristics. The methodologies used for the evaluation of the settleability of aerobic activated sludge, and for the expansibility of a sludge bed of Expanded Granular Sludge Bed reactors and Fluidised Bed Reactors were adapted ...


    By IWA Publishing

  • Modelling of moving bed biofilm membrane reactors (MBBMR) for on-site greywater treatment

    The study evaluates with a mechanistic model the pilot plant results of a combined moving bed biofilm process and membrane filtration (MBBMR) treating single household greywater. It mainly includes the simulation of reactor hydraulics, degradation of pollutants, development of biomass and settlement of sludge. Iterative calibration was made with steady-state results of a 10-month pilot test. The ...


    By IWA Publishing

  • Dewatering sludge originating in water treatment works in reed bed systems

    The dewatering process of the liquid water works sludge was examined in a trial with a series of six trial beds, each 20 m2. These were monitored from April 2008 to June 2010. It is possible to get the vegetation to grow in ferric sludge (∼300,000 mg Fe/kg dry solid, pH 7,7). It has not been necessary to use fertilizer. The influence of the loading programs (15–50 kg dry solid/m2/year) was tested ...


    By IWA Publishing

  • Laboratory analysis of the hydrogeological behaviour of rock loose structures on pervious beds

    Large flow interchanges occur between free surface and subsurface flows of river training structures, such as in rock loose chutes based on pervious beds. The filtering action of the base pervious layer can improve the water quality but, at the mean time, reduce the minimum vital flow discharge. This paper, hence, aims to analyse the flow interchanges between the base material and the surface ...


    By Inderscience Publishers

  • Is the water permit system a panacea or a bed of inefficiency? The case of South Africa

    Although South Africa has adopted a very modern permit/license system to control access to water as a resource, the attainment of the lofty objectives (efficiency, equity and sustainability) of the National Water Act of 1998 depends on two critical factors: (1) the institutional efficiency of the water management system; and (2) the development of water markets and their efficient functioning. ...


    By IWA Publishing

  • Can a moving bed bioreactor reduce toxicity of complex industrial wastewater?

    MeadWestvaco Corporation in DeRidder, Louisiana refines crude tall oil (a byproduct of black liquor) to produce a variety of specialty chemicals products. The facility generates approximately 0.46 million gallons per day (mgd) of wastewater that require treatment for total recoverable phenols (TRP), chemical oxygen demand (COD), biochemical oxygen demand (BOD), and whole effluent toxicity (WET). ...

  • Power Industry using Micro-Media Filtration and short-bed ion exchange

    With the demand or higher efficiencies, lower maintenance and operating costs for boilwers and turbines, high-purity water treatment systems are becoming more crucial to the operation of power plants. Modern power plants, operating at supercritical and ultra upercritical boiler pressures and temperatures, require high-purity water that approaches quality levels at the theoretical levels. ...


    By Eco-Tec Inc.

  • Control Problems Waste Feeds in Fluid Beds (PDF - File size 71K)

    High concentrations of alkali salts, iron, and phosphorus in sludge can cause operating problems in fluid-bed incinerators. Understand how clinker and scale form, and how to prevent difficulties. A major advantage of a high-temperature fluid bed (HTFB) is its ability to accept unsteady feed. Because a large quantity of heat is stored in the granular bed material, fluctuations in feed rate, ...

  • Minimization of Major Air Pollutants from Sewage Sludge Fluid Bed Incinerators

    ABSTRACT Emissions of major air pollutants including carbon monoxide (CO), nitrogen oxides (NOx) and mercury (Hg) were studied at two sewage sludge fluidized bed combustion (FBC) plants. Both the North West Bergen (NWB) County Utility Authority and the Little Miami (LM) plants have air pollution control systems (APCS) that are of the wet type. Various operating conditions such as temperature, ...

  • Short-term performance analysis of sludge treatment reed beds

    Sludge treatment reed beds (STRBs) represent an established technology for managing sludge produced by wastewater treatment plants (WWTPs). In this study, an analysis conducted on sludge stratigraphy in a STRB serving the municipal WWTPs of Helsinge (42,000 person equivalent, Denmark) is presented. The STRB has been in operation since 1996. The analysis was conducted for four months including ...


    By IWA Publishing

  • The application of moving bed biofilm reactor to denitrification process after trickling filters

    The paper presents research of a prototype moving bed biofilm reactor (MBBR). The device was used for the post-denitrification process and was installed at the end of a technological system consisting of a septic tank and two trickling filters. The concentrations of suspended biomass and biomass attached on the EvU Perl moving bed surface were determined. The impact of the external organic ...


    By IWA Publishing

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