WWTP operator Articles
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SABESP - Lagoon WWTP Upgrade - Case Study
Challenges for Sabesp Sabesp is a Brazilian water and waste management company owned by São Paulo state. It is the largest waste management company in the world by market capitalization, providing water services to 26.7 million residential, commercial and industrial users in São Paulo and in 363 of the 645 municipalities in São Paulo State. It provides basic sanitation ...
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The Effects of Bioaugmentation in Collection System on WWTP Operations
In 2004 the wastewater treatment plant in the Town of Orange Park had a very unique problem. The Town was in violation of the current Water Quality Based Effluent Limits (WQBEL) permit while they were simultaneously planning for the even more stringent, Basin Management Action Plan (BMAP) permit to take effect in 2008. The Town needed to address both long and short term wastewater treatment ...
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Sludge reduction in a small wastewater treatment plant by electro-kinetic disintegration
Sludge reduction in a wastewater treatment plant (WWTP) has recently become a key issue for the managing companies, due to the increasing constraints on the disposal alternatives. Therefore, all the solutions proposed with the aim of minimizing sludge production are receiving increasing attention and are tested either at laboratory or full-scale to evaluate their real effectiveness. In the ...
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Optimizing external carbon source addition in domestics wastewater treatment based on online sensoring data and a numerical model
The removal of total nitrogen in wastewater treatment plants (WWTPs) is often unsatisfactory for a variety of reasons. One possible measure to improve nitrogen removal is the addition of external carbon. However, the amount of carbon addition is directly related to WWTP operation costs, highlighting the importance of accurately determining the amount of external carbon required. The objective ...
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Chemical stress from Fe salts dosing on biological phosphorus and potassium behavior
In simultaneous precipitation, interaction between chemical and biological P removal could not be ignored. This work investigated effects of ferrous sulfate and Fe precipitates on metabolic behavior of bio-P and its counter cation of potassium. After dosing, mixed liquid suspended solids (MLSS) increased 9%, pH decreased from 7.35 to 7.00, sludge volume index (SVI) decreased, electrical ...
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Long-term evaluation of a spectral sensor for nitrite and nitrate
Abstract: A spectral in-situ UV sensor was investigated to measure nitrite and nitrate concentrations in the effluent of the EAWAG pilot-scale plant. The sensor was used with a calibration that was based on data from another WWTP and was operated over a period of 1.5 years. The results showed constant accuracy although the sensor was operated with minimal maintenance (manual cleaning once a ...
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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 ...
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Quantifying the uncertainty of on-line sensors at WWTPs during field operation
Abstract: It remains an ongoing task to quantify the uncertainty of continuous measuring systems at WWTPs during field operation. The commonly used methods are based on lab experiments under standardized conditions and are only suitable for characterizing the measuring device itself. For measuring devices under field conditions, a knowledge of the response time, trueness and precision is equally ...
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UNAS : The key to energy-positive sewage treatment
Water boards are looking for more cost effective ways to operate their WWTP’s and produce clean effluent in an energy neutral manner. As part of that strategy the maximum recovery of energy and nutrients becomes a major objective. A technology upgrade of existing installations reveals possible, whereby cold anammox plays a key role. The recently developed Upflow New Activated Sludge (UNAS) ...
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Mathematical modelling of biofilms and biofilm reactors for engineering design
Mathematical models are critical to modern environmental biotechnology—both in research and in the engineering practice. Wastewater treatment plant (WWTP) simulators are used by consulting engineers and WWTP operators when planning, designing, optimizing, and evaluating the unit processes that comprise municipal and industrial WWTPs. Many WWTP simulators have been expanded to include a submerged ...
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Digital transformation, key to improving operations in WWTPs
Integrating all data sources into a single environment is a fundamental step in the digital transformation of wastewater treatment plants to provide them with comprehensive control of all their processes, according to Idrica’s report “Digital transformation of WWTPs: key to a more sustainable future”. The most advanced digital transformation uses data to create, train and feed ...
By Idrica
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Diamond Project
DIAMOND is a 24-month ‘Research for SMEs’ European Union's (FP7/2007_2013) project that began in September 2012 and finished in August 2014. The project aims to achieve a model of excellence in the management of wastewater treatment systems by addressing the design, development, implementation and validation of new advanced data management, monitoring and control algorithms and tools ...
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The response of nitrous oxide emissions to different operating conditions in activated sludge wastewater treatment plants in Southeastern Brazil
The continuous measurements of N2O emissions from the aeration tanks of three activated sludge wastewater treatment plants (WWTPs) operated with biological nitrogen removal (BNR) and non-BNR were performed during the different operating conditions of several parameters, such as aeration, dissolved oxygen (DO) profiling and organic shock loading (with landfill leachate). The nitrification ...
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Comparative analysis of DNA-based microbial community composition and substrate utilisation patterns of activated sludge microorganisms from wastewater treatment plants operated under different conditions
In this study, the microbial community structure and carbon source utilisation profile of activated sludge samples collected from full-scale municipal wastewater treatment plants (WWTPs) operated under different conditions were characterised and compared, respectively, using terminal-restriction fragment length polymorphism (T-RFLP) analysis and Biolog assay. Samples were collected from each ...
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Improvement of nitrogen removal at WWTP Zurich-Werdhoelzli after connection of WWTP Zurich-Glatt. Water Science & Technology
Abstract: Optimisation of nitrifying activated sludge plants towards nutrient removal (denitrification and enhanced P-removal) leads to a substantial reduction of operating costs and improves effluent and operating conditions. At WWTP Zürich-Werdhöelzli, initially designed for nitrification only, an anoxic zone of 28% of total activated sludge volume was installed and allowed 60% ...
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Potential of in-situ sensors with ion-selective electrodes for aeration control at wastewater treatment plants
Abstract: A pilot-scale activated sludge wastewater treatment plant (WWTP) operated with nitrification and pre-denitrification was monitored with a set of on-line sensors for over 3 years. Wet-chemistry ex-situ analyzers, UV and UV-Visible in-situ sensors and in-situ sensors based on ion-selective electrodes (ISE) were used. New ISE sensors for ammonium, nitrate and nitrite, adapted to water and ...
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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 ...
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Potential of in-situ sensors with ion-selective electrodes for aeration control at wastewater treatment plants
Abstract: A pilot-scale activated sludge wastewater treatment plant (WWTP) operated with nitrification and pre-denitrification was monitored with a set of on-line sensors for over 3 years. Wet-chemistry ex-situ analyzers, UV and UV-Visible in-situ sensors and in-situ sensors based on ion-selective electrodes (ISE) were used. New ISE sensors for ammonium, nitrate and nitrite, adapted to water and ...
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Do wastewater treatment plants act as a potential point source of microplastics? Preliminary study in the coastal Gulf of Finland, Baltic Sea
This study on the removal of microplastics during different wastewater treatment unit processes was carried out at Viikinmäki wastewater treatment plant (WWTP). The amount of microplastics in the influent was high, but it decreased significantly during the treatment process. The major part of the fibres were removed already in primary sedimentation whereas synthetic particles settled mostly ...
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Trace organics removal using three membrane bioreactor configurations: MBR, IFAS-MBR and MBMBR
Seventeen pharmaceutically active compounds and 22 other trace organic pollutants were analysed regularly in the influent and permeate from a semi-real plant treating municipal wastewater. The plant was operated during 29 months with different configurations which basically differed in the type of biomass present in the system. These processes were the integrated fixed-film activated sludge ...
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