Sludge Thickeners Articles

  • Pre-treatment of thickened waste activated sludge (TWAS) for enhanced biogas production via the application of a novel radial horn sonication technology

    The efficacy of sonication as a pre-treatment to anaerobic digestion (AD) was assessed using thickened waste activated sludge (TWAS). Efficiency was measured in relation to solubilisation, dewaterability, and AD performance. Eighteen experimental conditions were evaluated at low frequency (20 kHz), duration (2–10 s), amplitude (∼8–12 μm) and applied pressure (0.5–3.0 barg), using a sonix™ ...


    By IWA Publishing

  • Accelerated anaerobic release of K, Mg and P from surplus activated sludge for element recovery and struvite formation inhibition

    Accelerated release of potassium (K), magnesium (Mg) and phosphorus (P) from surplus activated sludge (SAS) was investigated to develop a new system for the recovery of the elements. Anaerobic cultivation of SAS during 24 h released 78% of K and about 50% of Mg and P from SAS more effectively compared to aerobic cultivation (K: 40%, Mg: 15%, P: 15%). Furthermore, the addition of sodium acetate ...


    By IWA Publishing

  • Case study - Hadleys

    Material Source: Excavation waste from construction sites.  Equipment Installed: Main components included: Commander 1400 Hopper Feed Conveyor 16 x 5 Rinsing Screen Logwasher c/ with Dewatering Screens Finesmaster 120 Sand Plant 16 x 5 Dry Screen Bivitec Pre- Screen System ...


    By DUO (Europe) plc

  • Case study - Nottinghamshire Recycling

    DUO Equipment delivered and installed a new full washing and water management plant for Nottinghamshire Recycling Ltd (NRL). Based in Worksop, Nottinghamshire, NRL is a sustainable waste solution provider processing C & D waste, green waste, wood and recycled aggregates. The new washing and water management plant (which includes a Gennaretti centrifuge system) will provide NRL with the ...


    By DUO (Europe) plc

  • AkzoNobel launches global chemicals start-up challenge

    On January 16, 2017, AkzoNobel announced the launch of Imagine Chemistry, which provides start-up firms, students, research groups, and career scientists an opportunity to collaborate with AkzoNobel experts to solve real-life chemistry-related challenges.  ...


    By Bergeson & Campbell, P.C.

  • Ceramic Membranes in Sludge Thickening Applications

    The Aerobic Digestion group has recently been conducting pilot testing of silicon carbide ceramic membranes manufactured by the Danish company Cembrane A/S.  This promising technology shows a great ability to filter water even in the challenging high solids environment of sludge thickening.  The results of the pilot testing have led the aerobic digestion group to utilize ...

  • Native, acidic pre-treated and composite clay efficiency for the adsorption of dicationic dye in aqueous medium

    Environmental applications of composites have attracted the interests of researchers due to their excellent adsorption efficiency for pollutants. Native, HCl pre-treated clay and MnFe2O4/clay composite were investigated as an adsorbent for removal of methyl green from aqueous solution. The adsorption behaviors of dye onto native, HCl pre-treated and composite clays were studied as a ...


    By IWA Publishing

  • Sludge reduction via biodegradation of the endogenous residue (XE): experimental verification and modeling

    The feasibility of sludge reduction via the XE biodegradation process was explored both experimentally and through modeling, where the main focus was on determining the value of the bE parameter (first order degradation of XE) from a continuous process. Two activated sludge (AS) systems (30 L) were operated in parallel with synthetic wastewater during 16 months: a conventional ...


    By IWA Publishing

  • Case study - Sludge digestion/thickening optimizes treatment

    Overview: Big Park Domestic Wastewater Improvements District in Arizona had constructed a new 500,000 gallons per day biological wastewater treatment system in 1997. As time passed, the aging plant was unable to keep up with increasing demands. Challenge: In 2012, the District started working with Sunrise ...

  • Biofiltration WWTP 50.000 PE

    The aerated upflow biological filtration (biofiltration) is a technology which is today successfully used in more than 500 European wastewater treatment plants. Among this, the one of Sallek Valley, in Slovenia, differs by a two stage biofiltration and a part-recirculation of sludge from thickener to increase the COD concentration needed for denitrification. This process allows an advanced ...


    By AquaBiotec

  • A parametric study of alum recovery from water treatment sludge

    Alum recovery from water treatment sludge is a promising technique applied to decrease usage of fresh coagulants in the water treatment industry. In addition, alum recovery reduces sludge volume for easy handling. The undertaken work investigated the parametric conditions for alum recovery procedure by acidification. The results show that alum recovery reaches up to 69.03%, and the reduction ...


    By IWA Publishing

  • Mine backfill

    Mine backfill is defined as the material used to fill the cavities (i.e., stopes) created by underground mining. Backfilling can be a means to dispose of sludge and/ or tailings which may contain hazardous materials and to reduce surface environmental impacts by storing tailings underground. Alternately, backfilling with nonhazardous materials can allow for mining productivity improvements. To ...


    By WesTech Engineering, Inc.

  • Tailings paste disposal – more than water recovery

    The minerals industry has faced increasing pressures in recent years in the management of tailings streams. Environmental, economic and other factors have led many minerals producers to explore the technology of making and using “paste.” With the increasing number of installations worldwide, this technology has proved to not only be industry accepted, but economically advantageous. ...


    By WesTech Engineering, Inc.

  • Paste thickener bed level measurement

    Numerous studies and papers have been devoted to the subject of thickener design and operation to achieve specified throughput and discharge densities. Mathematical models have been developed that present methods for sizing thickeners and predicting performance under varying process conditions. The compression effect of deeper beds on dewatering performance is a recognized phenomenon. This is one ...


    By WesTech Engineering, Inc.

  • WWTP Sludge reduction case study

    Introduction The City of Spring Valley, IL was seeking bioaugmentation to reduce the economic burden of sludge dredging and disposal and to evaluate the possibility of restoring the microbiological activity in the lagoon. The lagoon was flooded several times from the near-by Illinois River, which created different strata of inorganic silt/organic sludge and densely packed sludge at the ...

  • Sludge reduction performance focus: Lagoon sludge case study

    In-Pipe Technology Pipe Technology® Company, Inc., Company, Inc., Company, Inc., is an effective, environmentally is an effective, environmentally is an effective, environmentally-friendly, and fiscally friendly, and fiscally responsible method to reduce accumulated lagoon solids. By reducing accumulated sludge volumes by 40% to 85%, In- volumes by 40% to 85%, In-Pipe Technology has helped ...

  • Pre-event water contributions to runoff events of different magnitude in pre-alpine headwaters

    Precipitation and catchment characteristics of mountainous headwaters can vary largely within short distances. It remains unclear how these two factors determine the contribution of event water and pre-event water to stormflow. We investigated this in five neighboring headwaters with high annual precipitation amounts (>2,000 mm y−1) in a steep pre-alpine region in Switzerland. Rainfall and ...


    By IWA Publishing

  • The investigation of the sludge reduction efficiency and mechanisms in oxic–settling–anaerobic (OSA) process

    This paper aims to provide a full understanding of the sludge reduction mechanisms in the oxic–settling–anaerobic (OSA) process and presents an evaluation of the sludge reduction efficiencies and sludge characteristics in this process compared to the conventional activated sludge process. Fifty-eight percent reduction in observed yield in the OSA process was achieved compared to the control ...


    By IWA Publishing

  • Improving the efficiency of Monte Carlo Bayesian calibration of hydrologic models via model pre-emption

    Bayesian inference via Markov Chain Monte Carlo (MCMC) sampling and sequential Monte Carlo (SMC) sampling are popular methods for uncertainty analysis in hydrological modelling. However, application of these methodologies can incur significant computational costs. This study investigated using model pre-emption for improving the computational efficiency of MCMC and SMC samplers in the context of ...


    By IWA Publishing

  • Application of forward osmosis (FO) under ultrasonication on sludge thickening of waste activated sludge

    Forward osmosis (FO) is an emerging process for dewatering solid–liquid stream which has the potential to be innovative and sustainable. However, the applications have still been hindered by low water flux and membrane fouling when activated sludge is used as the feed solution due to bound water from microbial cells. Hence, a novel strategy was designed to increase sludge thickening and reduce ...


    By IWA Publishing

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