activated sludge plant Articles

  • Cyclic activated sludge technology

    Cyclic activated sludge technology was selected for the Potsdam Wastewater Treatment Plant (90,000 p.e.). The cyclic activated sludge facility comprises four modules integrated into two circular basins. Construction was commenced in February 1998 with seeding of the plant for start up taking place in October 1998. Process performance has been met since Spring 1999 at 80-90 ...


    By Water Experts Germany

  • Abattoir, commissioning of activated sludge plant case study

    This abattoir’s ancient activated sludge system needed complete refurbishment requiring the aeration tank to be drained. A characteristic of the waste water is its consistently very high ammonia concentration. The activated sludge system has to achieve a final effluent of 20 mg/l BOD, 10 mg/l ammonia and 30 mg/l suspended solids. The authorities required that this standard be ...


    By Bio Systems Europe

  • Guidelines for using activated sludge models

    Mathematical modelling of activated sludge systems is used widely for plant design, optimisation, training, controller design and research. The quality of simulation studies varies depending on the project objectives, finances and expertise available. Consideration has to be given to the model accuracy and the amount of time required carrying out a simulation study to produce the desired ...


    By IWA Publishing

  • Waste-to-Energy Upgrade for Chicken Processing WWTP - Case Study

    When one of Italy’s top chicken producers needed to increase production while lowering costs, it turned to Fluence for a waste-to-energy upgrade to its existing WWTP. When one of Italy’s top agro-food processors wanted to expand its operations, it faced some difficult challenges, including reducing operational costs and producing an effluent that would meet strict European Union ...


    By Fluence Corporation

  • Floating Horizontal Aerators Enhance Eufaula, Alabama Activated Sludge Plant

    The Eufaula, Alabama, wastewater treatment plant (WWTP) is an extended aeration activated sludge facility designed for an average daily flow rate of 2.7 million gallons per day (mgd). Prior to February, 2005 this WWTP used vertical aerators to provide oxygen and mixing in its aerator basins. The plant has two aeration basins, each 1.87 million gallons in volume, which had 160 horsepower (hp) of ...


    By S & N Airoflo, Inc.

  • Activated Sludge Treatment Plant - Eatonton, Georgia - Case Study

    Solids management at municipal wastewater treatment plants is crucial in maintaining operating efficiencies and permitted discharge levels. Drying beds and mechanical methods of dewatering bio-solids can be labor intensive and inefficient for rapid solids removal. Miratech Geotube" Dewatering Technology offers munic-ipalities a cost effective solution for rapid solids removal and long term solids ...

  • Thermal hydrolysis of waste activated sludge at Hengelo Wastewater Treatment Plant, The Netherlands

    The thermal hydrolysis process (THP) is a sludge treatment technique which affects anaerobic biodegradability, viscosity and dewaterability of waste activated sludge (WAS). In 2011 a THP-pilot plant was operated, connected to laboratory-scale digesters, at the water board Regge en Dinkel and in cooperation with Cambi A.S. and MWH Global. Thermal hydrolysis of WAS resulted in a 62% greater ...


    By IWA Publishing

  • Continuous on-line monitoring of dissolved oxygen in the activated sludge of a sewage treatment plant

    Dissolved oxygen is traditionally measured using a Clark cell, which relies upon a gas-permeable membrane for its opera-tion. Such sensors are subject to fouling with subsequent loss of accuracy, making frequent maintenance and calibration necessary. The objective of this development was to take advantage of specific properties of microelectrode arrays, such as low flow-dependence, insensitivity ...


  • A retrofitted activated-sludge plant with sequential nitritation and anammox obtains dischargeable effluent

    Abstract New Activated Sludge (NAS) represents a hybrid, floc-based nitrogen removal process, based on the control of solids retention times (SRT) and dissolved oxygen (DO) levels. The aim of this study was to examine the performance of a full-scale NAS plant, which treated anaerobically digested industrial wastewater. The batch-fed partial nitritation step oxidized ...


    By Colsen International b.v.

  • Tetracycline Resistance Genes in Activated Sludge Wastewater Treatment Plants

    The development and proliferation of antibiotic resistance in pathogenic, commensal, and environmental microorganisms is a major public health concern. The extent to which human activities contribute to the maintenance of environmental reservoirs of antibiotic resistance is poorly understood. In the current study, wastewater treatment plants (WWTPs) were investigated as possible sources of ...

  • The role and control of sludge age in biological nutrient removal activated sludge systems

    The sludge age is the most fundamental and important parameter in the design, operation and control of biological nutrient removal (BNR) activated sludge (AS) systems. Generally, the better the effluent and waste sludge quality required from the system, the longer the sludge age, the larger the biological reactor and the more wastewater characteristics need to be known. Controlling the reactor ...


    By IWA Publishing

  • Ammonia Stripping And Integrated Fixed-Film Activated Sludge

    The Keystone Sanitary Landfill (KSL) is located at the Keystone Industrial Park in Dunmore and Throop Boroughs, Pennsylvania. The 618 acre landfill site was originally permitted for 5,000 tons of trash per day, and recently received a permit to develop more cells to extend the operation for another 25 years at 5,000 tons per day. Landfill leachate, an inevitable by-product of landfilling, is ...


  • CH#824 - Steel Production - Activated Sludge

    BackgroundThe treatment plant at this Steel Mill treats approximately 0.3mgd waste from the coke and steel operations. Over the past year the treatment works improved performance and consistently produced a good quality effluent with respect to phenol, suspended solids, ammonia and cyanide. An improvement in performance was required to meet future discharge limits. To achieve this level of ...


    By Bio-Systems International

  • What are the parameters of an extended-aeration activated-sludge system?

    The activated sludge process is the most widely used biological water and wastewater treatment. As is well known, by its means, suspended-growth microorganisms are applied to breakdown wastes. Aeration, the mixing of air and a liquid, is the means used to speed the reactions involved. Aeration methods include spraying the liquid into the air; diffusing air into the liquid or agitating the liquid ...


  • The Dangers of Uncalibrated Activated Sludge Simulation Packages

    ABSTRACTActivated sludge simulation packages are useful tools, but it can be dangerous to rely on them ifthey are used incorrectly. How dangerous? To determine potential pitfalls, we compared theactivated sludge tank volumes predicted by three simulation packages used directly out-of-theboxwithout calibration. We sought to identify the underlying reason for differences in predictedrequired ...

  • Performance evaluation of a large sewage treatment plant in Brazil, consisting of an upflow anaerobic sludge blanket reactor followed by activated sludge

    The objective of this study was to evaluate the behaviour of a system comprising an upflow anaerobic sludge blanket reactor followed by activated sludge to treat domestic sewage. The Betim Central sewage treatment plant, Brazil, was designed to treat a mean influent flow of 514 L/s. The study consisted of statistical treatment of monitoring data from the treatment plant covering a period of 4 ...


    By IWA Publishing

  • OUR Set-Point Control of Activated Sludge Processes

    The OUR Set-Point method is useful for controlling the activity and loading-rate capacity of an activated sludge mixed liquor. In this case, sufficient amounts of a stock substrate are added to a mixed liquor suspension to provide kinetic saturation with subsequent measure of OUR. Once an acceptable substrate is found for a specific wastewater treatment plant, an OUR can be identified that ...


    By Challenge Technology

  • The Removal of Alkylphenol Ethoxylate Surfactants in Activated Sludge Systems

    US EPA has finalized federal Water Quality Criteria for nonylphenol, a biodegradation intermediate of nonylphenol ethoxylates, which are commonly used surfactants. To provide information in support of this initiative, an assessment was made of the ability of wastewater treatment plants to remove these and other alkylphenol ethoxylate (APEO) surfactants that are used widely in domestic and ...

  • Low intensity ultrasound stimulates biological activity of aerobic activated sludge

    This work aims to explore a procedure to improve biological wastewater treatment efficiency using low intensity ultrasound. The aerobic activated sludge from a municipal wastewater treatment plant was used as the experimental material. Oxygen uptake rate (OUR) of the activated sludge (AS) was determined to indicate the changes of AS activity stimulated by ultrasound at 35 kHz for 0–40 min with ...


    By Springer

  • Complete solids retention activated sludge process

    In a slaughterhouse's full-scale extended aeration activated sludge wastewater treatment plant (WWTP), operating under complete solids retention time, the evolution of mixed liquor suspended solids (MLSS) and mixed liquor volatile suspended solids (MLVSS) concentration, food to micro-organisms ratio (F/M) and substrate utilization rate (SUR) were studied for over a year. Biomass growth phases ...


    By IWA Publishing

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