sludge thickening Articles

  • A case study of the sludge thickener - Large Commercial Facility (Office Building)

    Costs for industrial waste reduced with sludge thickener Some office buildings and large commercial facilities have wastewater treatment facilities underground. In such case, it is difficult to take dewatered cake out, so sludge is kept in liquid form and vacuumed out by pump without being dewatered. This potential customer also had been vacuuming out the liquid sludge, and had considered how to ...


    By AMCON Inc.

  • A simple empirical model for the clarification-thickening process in wastewater treatment plants

    In wastewater treatment plants (WWTPs), activated sludge is thickened in secondary settling tanks and recycled into the biological reactor to maintain enough biomass for wastewater treatment. Accurately estimating the activated sludge concentration in the lower portion of the secondary clarifiers is of great importance for evaluating and controlling the sludge recycled ratio, ensuring smooth and ...


    By IWA Publishing

  • Membrane thickening aerobic digestion processes

    Sludge management accounts for approximately 60% of the total wastewater treatment plant expenditure and laws for sludge disposal are becoming increasingly stringent, therefore much consideration is required when designing a solids handling process. A membrane thickening aerobic digestion process integrates a controlled aerobic digestion process with pre-thickening waste activated sludge ...


    By IWA Publishing

  • Newport WWTP Newport, WA

    In 2003 the city of Newport began a study of upgrading the city’s waste water treatment plant. Plant flows were increasing and the city wanted to process sewage from septage haulers handling recreational development in the area. Esvelt Environmental Engineering Company was selected to do the study and facility design. One of the first decisions made was rather than expand aeration basins, ...


    By BDP Industries

  • The laminar/turbulent transition in a sludge pipeline

    Globally, wastewater treatment plants are under pressure to handle high concentration sludge in a sludge treatment line. Unawareness of the non-Newtonian behaviour of the thickened sludge has the potential to cause unexpected problems when the fluid behaviour changes from turbulent to laminar flow. In this study, sludge apparent viscosity was plotted as a function of total suspended solids ...


    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

  • Metropolitan Sewer District (MSD), Cincinnati, Ohio U.S.A.: HTFB System

    The Metropolitan Sewer District (MSD) of Greater Cincinnati, Ohio is a 90 mgd primary treatment, 55 mgd activated sludge treatment plant. Solids processing includes gravity thickening of primary sludge, dissolved air flotation, thickening of secondary sludge, holding tank storage, belt filter press dewatering and pumping of cake to the old outdated multiple hearth ...

  • Environmental sludge treatment

    During the process of wastewater treatment, sludge generation is an important and at times crucial issue to be addressed as inadequate sludge handling system can pose serious environmental implications. Liquid sludge can be easily thickened and reduced to a solid cake via sludge thickening / dewatering. This reduces the volume of liquid sludge significantly, usually resulting in a quite ...


    By Doyen Machinery CO., Ltd

  • You can dewater your cake and pump it too! Conveyance options for OCSD Plant 1

    OCSD is currently upgrading Reclamation Plant 1 to co-thicken primary and waste activated solids using centrifuges. Digested solids will also be dewatered using centrifuges and the two processes will be housed in the same building. A small building footprint, stringent redundancy requirements, and a 200 foot distance between the dewatering and storage facilities requires innovative engineering ...

  • Pressure-loss computation procedures for non-Newtonian pipe flow

    Wastewater sludge with solids concentrations above about 2 percent exhibit non-Newtonian behavior, i.e., the sludge apparent viscosity changes with the shear rate (flow velocity). To determine pipeline head loss for sludge streams to and from anaerobic digesters, samples of primary, secondary and digested sludge were collected from Orange County Sanitation District Plant No. 1 and analyzed to ...

  • 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.

  • Process optimization with RheoScan at a wastewater treatment plan in Ljubljana, Slovenia - Case Study

    Smart sludge control In Ljubljana, Slovenia, one particular customer in the wastewater industry has continuously sought to improve efficiency. That is why the plant owner tested our Rheo-Scan, an automated, optical polymer measurement and dosage system at the belt thickening stage to reduce polymer consumption and enhance digester performance, in 2014. The ...

  • 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

  • Robust systems for optimal treatment - Case Study

    Big Park Domestic Wastewater Improvement 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. Challenges In 2012, the District started working with Sunrise Engineering to find a solution that would work in their existing plant. Sunrise ...

  • The Operator’s Guide to Monitoring Secondary Clarifier Performance

     ABSTRACT The State Point Analysis (SPA) procedure, formalized by Keinath, et. al. (1977), provides exceptional insight into the expected performance of activated sludge secondary sedimentation basins. Yet, the operating guidance offered by the SPA is not employed regularly and with confidence - particularly by operations personnel. Such lack of use may stem from the perceived ...

  • Municipal sewage application (Nagano Prefecture) case study

    Squeeze sludge fresh out of the reactor. Don't wait until it stinks! In the wastewater treatment plant of a town in Nagano, the long-used belt press was in a time to be overhauled. The person in charge had racked his brain over the problem of huge cost required to overhaul this equipment at regular intervals. He had been seeking a solution to this problem. In addition, he had to cope ...


    By AMCON Inc.

  • 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 ...


    By Ovivo

  • Squeeze sludge fresh out of the reactor. Don`t wait until it stinks! (Japan)

    Municipal sewage application [Oxidation Ditch] 【Problem】 In the wastewater treatment plant of a town in Nagano, the long-used belt press was in a time to be overhauled. The person in charge had racked his brain over the problem of huge cost required to overhaul this equipment at regular intervals. He had been seeking a solution to this problem. In addition, he ...


    By AMCON Inc.

  • Cambi – the digester `turbo charger`

    ABSTRACT A new patented process design has re-invented thermal hydrolysis in sludge treatment. The first plant from Cambi for hydrolysis of sewage sludge was built in 1995 at the HIAS WwTP, Hamar, Norway for a design capacity of 3500 Mg DS/year. The sludge is directly heated by injection of live steam. During internal recycling of steam a low energy consumption is secured. Predewatering raw ...


    By Cambi Group AS

  • Bio-Solids Process Enhancements Resulting From the Use of Hydrogen Peroxide for Hydrogen Sulfide Odor Control - The San Antonio Experience

    ABSTRACTThe paper will present results of a trial initiated in February 2004 by the San Antonio Water System (SAWS) to quantify the impacts of hydrogen peroxide injection prior to dissolved air flotation thickening of wastewater sludges. Since February 2000, the San Antonio Water System has successfully used iron salts (FeSO4) for odor and ...

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