activated sludge WWTP Articles

  • 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 ...

  • Towards energy neutrality by optimising the activated sludge process of the WWTP Bochum-Ölbachtal

    As a result of Ruhrverband's regularly performed energy audits the wastewater treatment plant (WWTP) Bochum-Ölbachtal shows substantial deficits concerning energy efficiency. Due to the energy consumption of internal recirculation, mixers and return activated sludge (RAS) pumping the existing pre-denitrification process configuration offers a specific energy consumption for biological ...


    By IWA Publishing

  • Special activated sludge system works well as small town`s first WWTP

    The public works superintendent and his consulting engineer here report successful operation of a special activated sludge wastewater treatment plant (WWTP) for St. Philip’s since the end of 2003, with a similar and larger plant scheduled to start up for Portugal Cove later this year. The currently operating plant, with design average flow of 7.7 liters/sec. and peak flow of 28.5 liters/sec., has ...


    By Fluidyne Corporation

  • Effects of selected industrial pollutants on urban WWTPs activated sludge population, and possible mitigation strategies

    This study concerns the effects on microbial populations and treatment plant performance on the presence of Chromium and surfactants in incoming wastewater. The study considers two actual treatment plants in a northern Italian City, one treating mostly urban sewage, the second a mixture of urban and industrial wastewater. A comparative assessment of the two plants was performed in laboratory ...


    By IWA Publishing

  • Two Year Case Study of Integrated Fixed Film Activated Sludge (IFAS) At Broomfield, Co WWTP

    The City & County of Broomfield wastewater treatment plant secondary treatment processes were upgraded to a new biological nutrient removal process described as Integrated Fixed Film Activated Sludge (IFAS) back in 2003 using a moving bed plastic carrier element to help grow the biomass. This allows the existing aerobic reactors to maintain nitrification during year round operation while ...

  • Anaerobic digestion and thermal hydrolysis to reduce production of sludge in WWTPs

    Abstract Mesophilic and thermophilic digestion of primary and activated sludge was investigated in lab scale reactors. Mixed primary and activated sludge was digested in one experiment and activated sludge was digested alone in another. The same gas yield, COD and dry solids reduction was obtained with both mesophilic and thermophilic digestion. However, more dissolved COD was found after ...


    By Cambi Group AS

  • 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

  • Application of Bioaugmentation for quick restoration of microbial activity in a Cheese WWTP

    The use of Bioaugmentation has been shown to be a very effective method of restoring activity in a wastwater treatment plant treating the effluent from cheese production. The plant had lost activity and in this case activity was restored without removing the existing dead biomass. This presented a considerable challenge and resulted in considerable savings for the client since the dead sludge ...


    By Biofuture Ltd

  • The Role of Activated Sludge Solids in an Actiflo® System

    ABSTRACTThis research was conducted using jar tests to investigate the impact of adding activated sludge solids to the Actiflo® process, a high-rate clarification (HRC) system, to increase BOD removal in HRC systems treating raw wastewater during periods of high wet-weather flows (WWF). A study of dosages and impacts of ferric sulfate, polymer, microsand and activated sludge on performance of the ...

  • WWTP design in warm climates – guideline comparison and parameter adaptation for a full-scale activated sludge plant using mass balancing

    The ATV-A-131 guideline and the design approach published in ‘Wastewater Engineering, Treatment and Reuse (WE)’ are widely used for the design of activated sludge plants. They are both based on simplified steady-state assumptions tailored to the boundary conditions of temperate climates. Using design guidelines beyond the designated temperature range may lead to inappropriate ...


    By IWA Publishing

  • Control of Microthrix parvicella and sludge bulking by ozone in a full-scale WWTP

    Bulking and rising sludge are common problems in wastewater treatment plants (WWTPs) and are primarily caused by increased growth of filamentous bacteria such as Microthrix parvicella. It has a negative impact on sludge settling properties in activated sludge (AS) process, in addition to being responsible for foam formation. Different methods can be used to control sludge bulking. The aim of ...


    By IWA Publishing

  • Modeling organic nitrogen conversions in activated sludge bioreactors

    For biological nutrient removal (BNR) systems designed to maximize nitrogen removal, the effluent total nitrogen (TN) concentration may range from 2.0 to 4.0 g N/m3 with about 25–50% in the form of organic nitrogen (ON). In this study, current approaches to modeling organic N conversions (separate processes vs. constant contents of organic fractions) were compared. A new conceptual model of ON ...


    By IWA Publishing

  • 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 ...

  • Differential sensitivity of nitrifying bacteria to silver nanoparticles in activated sludge

    Nitrification is known to be one of the most sensitive processes affected when activated sludge (AS) is exposed to antimicrobial silver nanoparticles (AgNPs). However, the impact of AgNPs and their released silver ions (Ag+) on the abundance, activity and diversity of different nitrifying bacteria in wastewater treatment plants (WWTPs) is poorly understood. Herein we investigate the impacts of ...


    By John Wiley & Sons, Ltd.

  • Chitosan use in chemical conditioning for dewatering municipal-activated sludge

    This work aims to evaluate the potential use of chitosan as an eco-friendly flocculant in chemical conditioning of municipal-activated sludge. Chitosan effectiveness was compared with synthetic cationic polyelectrolyte Sedipur CF802 (Sed CF802) and ferric chloride (FeCl3). In this context, raw sludge samples from Beni-Messous wastewater treatment plant (WWTP) were tested. The classic jar test ...


    By IWA Publishing

  • Case study: Municipal WWTP

    OverviewAn urgent improvement of the effluent quality of the old existing WWTP of Yavne was required by the Environmental Ministry of Israel. RequirementEffluent from the Yavne WWTP used to be discharged into a river which flows into the Mediterranean Sea. Years of inadequate treatment in two extensive ponds caused severe pollution. As a result, the Environmental ...

  • Case study: Municipal WWTP

    OverviewThe municipal WWTP at Monclova, Mexico had to increase its capacity by a factor of 1.5 and improve nitrification capacity, for 100% reuse by industry.  RequirementsThe city of Monclova operates a modern wastewater treatment plant which receives urban and industrial wastewater. A retrofit for an increase of 50% in capacity was required, as well as improvement in ...

  • 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.

  • Discharge quality from municipal wastewater treatment plants and the Sludge Biotic Index for activated sludge: integrative assessment

    Wastewater treatment plants (WWTPs) are scrutinized by Environmental Authorities particularly regarding the compliance to discharge limit values fixed by national and local regulations. An integrated approach is necessary to achieve the objectives established with Directive 2000/60/EC (WFD) considering the ecological status of the receiving water body and the quality of the discharge. ...


    By IWA Publishing

  • The application of multi-objective optimization method for activated sludge process: a review

    The activated sludge process (ASP) is the most generally applied biological wastewater treatment approach. Depending on the design and specific application, activated sludge wastewater treatment plants (WWTPs) can achieve biological nitrogen (N) and phosphorus (P) removal, besides the removal of organic carbon substances. However, the effluent N and P limits are getting tighter because of ...


    By IWA Publishing

Need help finding the right suppliers? Try XPRT Sourcing. Let the XPRTs do the work for you