activated sludge technology Articles
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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 percent of design load. ...
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Achieving and maintaining of short-cut nitrification in a cyclic activated sludge system
A lab-scale Cyclic Activated Sludge Technology (CAST) system was operated more than 5 months to evaluate the effects of the operation mode on nitrogen removal performance and investigate a feasible method for achieving short-cut nitrification in the system. Results showed that nitrogen was removed by conventional biological nitrification and denitrification in traditional operation mode ...
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Biological nitrogen removal in a step-feed CAST with real-time control treating municipal wastewater
The performance of a 18 L step-feed cyclic activated sludge technology (CAST) combined with real-time control treating real municipal wastewater was evaluated. The operation strategies employed pH and oxidation reduction potential (ORP) as on-line control parameters, which can control the durations of oxic and anoxic phases flexibly. The obtained results showed that the studied process had ...
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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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Effect of influent nutrient ratios and temperature on simultaneous phosphorus and nitrogen removal in a step-feed CAST
A step-feed cyclic activated sludge technology (CAST) with a working volume of 72 L treating real municipal wastewater was operated to examine the effect of varying ratios of influent COD/TN and COD/P on the nutrient removal. With the increased COD/P and COD/TN, the phosphorus and nitrogen removals exhibited an upward trend. The TN removals had a positive linear correlation with the phosphorus ...
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Sludge reduction and performance analysis of a modified sludge reduction process
A modified sludge process reduction activated sludge (SPRAS) technology was developed by inserting a sludge process reduction (SPR) module, composed of an aeration tank and a settler, before the activated sludge system was proposed in this study. Compared with the anaerobic/anoxic/aerobic (AAO) process, the SPRAS resulted in a remarkable decrease in sludge production by 76.6%; sludge ...
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Systematic approach for model verification - Application on seven published Activated Sludge Models. Water Science & Technology
Abstract: The quality of simulation results can be significantly affected by errors in the published model (typing, inconsistencies, gaps or conceptual errors) and/or in the underlying numerical model description. Seven of the most commonly used activated sludge models have been investigated to point out the typing errors, inconsistencies and gaps in the model publications: ASM1; ASM2d; ASM3; ...
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Treatment of high strength resin production wastewater case study
Problem Full-scale Incineration of this wastewater had proved very expensive due to the fuel input required and the ongoing incinerator maintenance costs. The polymer manufacturer sought treatment alternatives to save money. Initial biotreatment pilot work indicated that biotreatment was not feasible using conventional activated sludge technology even when the concentrated wastewater was diluted ...
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Abatement efficiency of municipal wastewater treatment plants using different technologies (Orbetello Lagoon, Italy)
Two small-scale municipal wastewater treatment plants (Neghelli and Terrarossa) discharging effluents into a lagoon of great environmental interest and highly stressed by tourism (Orbetello, Italy) were monitored over the year 2001. We evaluated plants' performances developing a general efficiency indicator of removal to select the suitable purification technology (activated sludge, Neghelli vs. ...
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Trends in biosolids handling technologies: economics and environmental factors
Changes in activated sludge technology, with a much greater focus on nutrient removal instead of removal of organics, together with relatively long sludge mean that the primary sludge stream has been lost, and the sludge produced is less degradable. At the same time with the growing importance of sustainable solutions, beneficial agricultural use is being increasingly used. This changes quality ...
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Advanced respirometry for activated sludge process
Introduction Respirometry is the measurement and interpretation of the biological oxygen consumption rate under well defined experimental conditions. Because oxygen consumption is directly associated with both biomass growth and substrate removal, respirometry is a very useful technique for monitoring, modeling and control of the activated sludge process The Respirometry technology is a well ...
By SURCIS, S.L.
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Dubai labor camp not worried about water - Case study
Installer: Jallad Environmental Distributor: Clearbrook, Inc. With water scarcity as a major concern for the MENA region, the need to reuse wastewater became a major focus for a project located in the labors camp region of Dubai. Consisting of a fluctuating occupancy (between 4,000 to 6,000 workers throughout the year), a decentralized wastewater system was determined to be the best course of ...
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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 ...
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Life cycle assessment comparison of activated sludge, trickling filter, and high-rate anaerobic-aerobic digestion (HRAAD)
This paper conducts a comparative assessment of the environmental impacts of three methods of treating primary clarifier effluent in wastewater treatment plants (WWTPs) through life cycle assessment methodology. The three technologies, activated sludge (AS), high rate anaerobic-aerobic digestion (HRAAD), and trickling filter (TF), were assessed for treatment of wastewater possessing average ...
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Minimal Site Disruption with RetroFAST - Case study
Installer: Carleton Environmental Services, Inc. in conjunction with L&S Water Technologies, Inc. Location: Ontario, Canada Rob Sanna, technical advisor for L&S Water Technologies, was contacted by a homeowner in September 2003 to provide maintenance and pump out for a 14-year-old conventional septic system utilizing a sand drain fi eld. The system was bleeding out, creating small ponds ...
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Case study - drain field renovation with RetroFAST
Engineer: Dick Bartel, Point One Engineering Distributor: Frank Hay, Pinnacle Environmental Technologies, Inc. Location: British Columbia, Canada Dick Bartel approached Frank Hay in mid August 2002 looking for alternatives for repairing a neighbor’s biologically-failing conventional septic system. Bartel had originally looked into replacing the entire soil absorption system with a ...
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Do nonwovens offer a cheaper option?
Untitled Document Could nonwoven filtration material be used as a viable, cheaper alternative to hollow fibre membranes in submerged membrane bioreactors, without a loss in performance? Filtration + Separation takes a look at one research report that thinks so. Nonwoven for the MBR – why bother? The Membrane Bioreactor (MBR) is an evolving process that combines ...
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IFAS for Enhanced Biological Nutrient Removal Case Study
Wastewater treatment plants that employ conventional biological treatment processes designed to meet secondary treatment effluent standards typically do not remove total nitrogen (TN) or total phosphorus (TP) to the extent needed to protect receiving waters. However, wastewater treatment facilities are increasingly being required to address this issue by implementing treatment processes that ...
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High efficient and economic waste water treatment using Standardized Biological Aerated Filtration sBAF (Biofiltration)
Biological Aerated Filtration (BAF) is a technology which is today successfully used in more than 500 European wastewater treatment plants. Biofiltration is a compact and modular aerated biological reactor which has several advantages compared with classic technologies like activated sludge with its suspended growth. The main advantages of using biofilters with fixed film biomass are the ...
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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 ...
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