Dewatering Systems Articles

  • Case study: Large package sewage treatment plants with MBR technology in Africa

    In 2014 DEVISE ENGINEERING S.A. participated in an International Tender to Design and Build seven (7) advanced MBR Package Sewage Treatment Plants for “A.A.W.S.A” (Addis Ababa Water and Sewage Authority) and won the project over strong competition. The aim was to provide an efficient and cost effective solution for the treatment of sewage originating from the new decentralized ...


    By DEVISE ENGINEERING S.A.

  • A smarter approach to solids control

    When looking at technical brochures and marketing materials in regards to solids-control equipment, one question that should always come to mind should be: Is this really necessary? Other great questions to ask are: What are my day-to-day needs; and what are my severe, high-duty needs? Finding the right solidscontrol equipment is much like buying a personal automobile. Most vehicles’ ...


    By Elgin Separation Solutions

  • Wastewater-Solids Dewatering Odor Control - Case Study

    Background The Milan Wastewater Treatment Plant, located just south of Moline, Illinois, is a 1.7 MGD (6,434 m3/day) activated sludge facility with an average wastewater flow of 700,000 gpd to 800,000 gpd. This facility dewaters primary sludge using a belt filter press (Figure 1). The press operates an average of three times per month, 8 hours per day at a pump rate of 100 gpm. The ...


    By Carus Corporation

  • Dam Removal, Gob Fire - Case Study

    Coal Gob Fire Quenching – Wellston, Ohio Removal of a dead lake from a former coal mine in Southern Ohio. While working on removal of a dead lake we uncovered a burning gob fire. We moved 45,000 cubic yards of cut to fill and cut to waste, installed 36" reinforced concrete pipe to relieve the dam, and dewatered over 100 million gallons. We moved over 16,000 cubic yards of earth to ...

  • Rectangular Vibrating Screen Separators: Uses and Applications

    Vibratory screeners come in a wide range of sizes and configurations to support a diverse set of applications. Choosing the right machine for your purposes can be a daunting task — particularly if you’re upgrading older equipment that has been used for years. Technology has changed considerably, and there’s a good chance what was best for ...


    By VibraScreener Inc.

  • Operational strategy, economic and environmental performance of sludge treatment reed bed systems – based on 28 years of experience

    Sludge treatment reed bed (STRB) systems have been used for dewatering and mineralisation of sludge in Europe since 1988. STRB systems provide substantial environmental, economic, and operational benefits compared to mechanical sludge dewatering solutions such as belt presses and centrifuges. They require less energy, no chemicals, reduce the sludge volume and produce bio solids with dry solid ...


    By IWA Publishing

  • Effect of pH on the flocculation behaviors of kaolin using a pH-sensitive copolymer

    pH-sensitive copolymers have been widely introduced to achieve rapid dewatering and consolidation of solids in mining and oil sands processing wastes. But no more attention has been given to the flocculation efficiency of solid suspensions as a function of pH using pH-sensitive copolymer. In this study, a pH-sensitive copolymer was synthesized and employed to investigate the flocculation ...


    By IWA Publishing

  • A review on sludge dewatering indices

    Dewatering of sludge from sewage treatment plants is proving to be a significant challenge due to the large amounts of residual sludges generated annually. In recent years, research and development have focused on improving the dewatering process in order to reduce subsequent costs of sludge management and transport. To achieve this goal, it is necessary to establish reliable indices that ...


    By IWA Publishing

  • Rotomite 6000 dredge system - centennial coal-case study

    Centennial Coal's Mannering Colliery mine averages over 1M tons of coal per year when operating at full capacity. The mine's run-off ponds' sludge issues prompted Centennial to contact Dredging Solutions, SRS Crisafulli's Dealer in Australasia, and an experienced dredging contractor.  Dredging solutions deployed the Crisafulli Rotomite 6000 auger suction dredge system because of the ...


    By SRS Crisafulli, Inc.

  • Rotomite dredging iron mill scale-case study

    Crisafulli's Rotomite-6000. Dredging highly abrasive mill scale. Customer: The customer purchased its first SRS Crisafulli Rotomite, a Model 180P, in August 1997, and purchased its second Rotomite, a 6000 model, in the summer of 2007. Application and reason for dredging: The customer provides slag processing, metal recovery, material ...


    By SRS Crisafulli, Inc.

  • Harlem, MT USA WWTP Uses FLUMP - 2013-case study

    Excessive lagoon sludge accumulation contributes to the poor performance of any treatment system.  Removing sludge from lagoon cells improves treatment and addresses violations in the Department of Environmental Quality enforcement action. The City of Harlem, Montana has a three cell partially mixed aerated lagoon system constructed in 1985.  The lagoon system discharges to the Milk ...


    By SRS Crisafulli, Inc.

  • Dredge caustic and abrasive materials in South Korea-case study

    Customer: Zinc mining & processing facility, South Korea. Problem: How to remove 200,000 cubic meters of 325 mesh goethite (pH 2.2 - 2.5 range; sulfuric acid) from a lined pond with dimensions of 120m x 253m. Since the material had settled and was resting on the pond bottom, dredging was selected as the appropriate removal method. No standard acid-resistant dredge ...


    By SRS Crisafulli, Inc.

  • Horizontal Mixers for Secondary Combustibles - Case Study

    The manufacture of secondary combustibles from household waste, industrial waste and special waste in accordance with statutory requirements is to be a huge challenge for system suppliers in the coming years. Currently, at times, extremely differing substances are treated in such a way that they can be loaded into conventional furnaces. The most important requirement is the detailed control over ...


    By AVA - Huep GmbH u. Co. KG

  • Research on the stability of heavy metals (Cu, Zn) in excess sludge with the pretreatment of thermal hydrolysis

    Thermal hydrolysis (TH) has been used to improve anaerobic digestion performance as well as the stability of heavy metals in sludge. Because the toxicity of heavy metals is closely related to both the concentration and the chemical speciation, more exhaustive studies on speciation distribution are urgently needed. This research aimed to investigate the effects of TH treatment (especially the ...


    By IWA Publishing

  • Improved dewatering of CEPT sludge by biogenic flocculant from Acidithiobacillus ferrooxidans

    Bioleaching using an iron-oxidizing bacterium, Acidithiobacillus ferrooxidans, and its biogenic flocculants was evaluated to improve the dewaterability of chemically enhanced primary treatment (CEPT) sewage sludge. CEPT sludge in flasks was inoculated with A. ferrooxidans culture, medium-free cells and the cell-free culture filtrate with and without the energy substance ...


    By IWA Publishing

  • Dredging Technology – Underwater Excavation and Construction

    The presence of water is ussualy considered a nuisance in construction, particularly when excavating removing water is common practice. In some cases however, water can be a very useful tool that may simplify things greatly. With the “flooded excavation principle”, the construction site is flooded after the retaining walls have been installed (e.g. sheet pile). When the ...


    By BBA Pumps

  • Case study: Innovative package solution for a wastewater reuse application in the Island of Crete

    DEVISE ENGINEERING S.A. designed, engineered and manufactured a Modular Package (MBR) Wastewater Treatment Plant in the touristic area of “Gouves” for the Municipality of Hersonissos, Prefecture of Heraklion in the Island of Crete. This Package Sewage Treatment Plant treats domestic sewage and the effluent water is suitable for unrestricted irrigation, with guaranteed high quality ...


    By DEVISE ENGINEERING S.A.

  • Impact of fine mesh sieve primary treatment on nitrogen removal in moving bed biofilm reactors

    The purpose of this project was to investigate the effect of selective particle removal during primary treatment on nitrogen removal in moving bed biofilm reactors (MBBRs). Two small MBBR pilot plants were operated in parallel, where one train treated 2 mm screened municipal wastewater and the other train treated wastewater that had passed through a Salsnes Filter SF1000 rotating belt sieve ...


    By IWA Publishing

  • Effects of thermal hydrolysis temperature on physical characteristics of municipal sludge

    Effects of thermal hydrolysis temperature on the physical properties of municipal sludge was further studied by a series of experiments. There was a decrease in bound water content with an increase in hydrolysis temperature, while there was an increase in pH at temperatures below 120 °C, and a decrease at temperatures exceeding 120 °C. An analysis of settleability, centrifugation and vacuum ...


    By IWA Publishing

  • Optimisation of micro-processes for shear-assisted solid–liquid separation in a rotatory batch flow vortex reactor

    This paper reports the study of micro-processes in a novel pre-treatment technique using a pellet forming batch flow vortex reactor of cylindrical shape that consists of axially revolving rotor plates between fixed stator plates. The suspension was first mixed with high molecular weight synthetic polymers by stirring for approximately 50 seconds and then agitated for 20 minutes. The process ...


    By IWA Publishing

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