activated sludge process Articles

  • 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 nitrifying granules to improvement of nitrification activity in activated sludge process

    Nitrifying granules were used to improve nitrification performance of activated sludge process under high organic load. After inoculation of nitrifying granules, nitrification activity immediately increased, and kept for at least 70 days. Fluorescence in situ hybridisation analysis confirmed that nitrifying bacteria were retained in the granules even though nitrifying granules had been served in ...


    By Inderscience Publishers

  • 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

  • New dimensiong guideline and standard for the activated sludge process

    Since June 2016 a new standard for the design of activated sludge systems is valid. The most significant point is the change of the basic value from BOD to COD. The standard is also the basis for designing SBR-systems. The article discusses main aspects of the new design basis and how AQUA DESIGNER has been modified and adapted to this. In AQUA DESIGNER you can calculate the continuous and ...


    By BITControl GmbH

  • Biodegradation of Cypermethrin by pseudomonas in a batch activated sludge process

    The biodegradation of Cypermethrin (20 to 125 mg/L) in an effluent using batch activated sludge was studied. Degradation was found to occur to a great extent only in the presence of Pseudomonas (IES-Ps-1) culture. Under aerobic conditions using mechanical aerators, Cypermethrin (20 mg/L) was almost completely degraded in just over 48 h at ambient temperature. Further loading of organic compound ...

  • Influence of reactor configuration on reliability of activated sludge process

    The effect of uncertainty in system parameters and the accuracy of the mathematical model used on the design and reliability of the activated sludge process is investigated by Monte Carlo simulations. Simulations indicate that the coefficient of variation for a reactor volume varies from 0.56 for a single mixed tank reactor to 0.44 for a plug flow reactor. The coefficient of variation for ...


    By Inderscience Publishers

  • 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

  • Modeling Greenhouse Gas Emissions From Activated Sludge Processes

    Dynamic simulation of activated sludge process is a common tool for wastewater treatment design and optimization. Most activated sludge models predict only the uptake of BOD and nutrients, however, they can easily be supplemented with further information regarding greenhouse gas (GHG) production to predict the generation of components such as CO2. Many published anaerobic digestion models contain ...

  • Pre-ozonation in the activated sludge process: fate of nitrogen species

    The objective of this research was to include ozonation prior to an activated sludge treatment and investigate the effect on the nitrogen species, their fate and the consequences of this oxidation upon the biomass. Three parallel treatment systems were used: the base system, where feed went directly to the activated sludge reactor, and two others, where the influent was ozonated at two different ...


    By IWA Publishing

  • Fixed activated sludge treatment (FAST®) process technology overview

    Biological treatment systems for small communities and even single-family dwellings have been available in the general water pollution control market for many years. These systems are basically scaled-down versions of the activated sludge process, utilizing suspended growth systems. Historically, the main operational problem associated with these systems has been the management of the sludge ...


    By BIOMICROBICS, Inc.

  • Impact of activated sludge process configuration on removal of micropollutants and estrogenicity

    The efficacy of three different wastewater treatment configurations, conventional activated sludge (CAS), nitrifying activated sludge (NAS) and biological nutrient removal (BNR) for removal of selected micropollutants from authentic wastewater was investigated. The processes were also characterized based on their proficiency to reduce the estrogenic activity of the influent wastewater using the ...


    By IWA Publishing

  • Advanced anaerobic processes to enhance waste activated sludge stabilization

    The requirement for enhanced stabilization processes to obtain a more stable, pathogen-free sludge for agricultural use is an increasing challenge to comply with in the waste hierarchy. With this in mind, the Routes European project (‘Novel processing routes for effective sewage sludge management’) is addressed to assess innovative solutions with the aim of maximizing sludge ...


    By IWA Publishing

  • Operational cost optimization modeling for conventional activated sludge process

    Energy and solids processing cost accounts for 40% of the total operation and maintenance costs in wastewater treatment facilities. This indicates the potential for saving operation and maintenance costs through the process optimization. The limitations of most cost optimization studies carried out in the past are either these studies could not be applied to existing facilities as the objective ...

  • Applications of the deep-shaft activated sludge process in wastewater treatment

    The deep-shaft activated sludge process is a unique modification of the activated sludge system. The main objective of this system is to increase the amount of dissolved oxygen available for biological activity. This can be achieved by increasing the rate of oxygen transfer from the gas phase to the liquid phase. The deep-shaft configuration increases the partial pressure of oxygen, thereby ...


    By Inderscience Publishers

  • Efficient nitrogen removal for wastewater in compartmentalised activated sludge process

    Studies were conducted on two aerobic-anaerobic configurations of the activated sludge process for nitrogen removal from domestic wastewater. An initial anaerobic stage followed by aerobic, anaerobic and aerobic stages provided best total Kjeldahl nitrogen removal. This profile was selected for conducting further experiments on the effect on nitrogen removal of the hydraulic loading and the food ...


    By Inderscience Publishers

  • Comparison between inhibitor and uncoupler for minimizing excess sludge production of an activated sludge process

    In order to study the minimization of excess sludge production, the reduction in the excess sludge production in the presence of an inhibitor and uncoupler was studied in this work. The experimental results show that such an addition could effectively reduce the production of excess sludge. With the energy uncoupling model established in this work, energy uncoupling coefficient (E u) was used to ...


    By Springer

  • Fate of selected pharmaceutically active compounds in the integrated fixed film activated sludge process

    The potential for integrated fixed film activated sludge (IFAS) processes to achieve enhanced transformation of pharmaceuticals relative to conventional activated sludge (CAS) processes was assessed. Previous studies have focused on direct comparisons of parallel reactors with and without fixed film carriers and little information is available on the impacts of how varying operating parameters ...


    By IWA Publishing

  • Valuation of OSA process and folic acid addition as excess sludge minimization alternatives applied in the activated sludge process

    The aim of this study was to investigate the ability of the oxic-settling-anaerobic (OSA)-process and the folic acid addition applied in the activated sludge process to reduce the excess sludge production. The study was monitored during two distinct periods: activated sludge system with OSA-process, and activated sludge system with folic acid addition. The observed sludge yields ...


    By IWA Publishing

  • The application of model predictive control of ammonia nitrogen in an activated sludge process

    In this paper a model predictive controller (MPC) for ammonia nitrogen is presented and evaluated in a real activated sludge process. A reduced nonlinear mathematical model based on mass balances is used to model the ammonia nitrogen in the activated sludge plant. An MPC algorithm that minimises only the control error at the end of the prediction interval is applied. The results of the ammonia ...


    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