activated sludge treatment plant Articles
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A neural network approach for on-line fault detection of nitrogen sensors in alternated active sludge treatment plants
In this paper, an effective strategy for fault detection of nitrogen sensors in alternated active sludge treatment plants is proposed and tested on a simulated set-up. It is based on two predictive neural networks, which are trained using a historical set of data collected during fault-free operation of a wastewater treatment plant and their ability to predict reduced (ammonium) and oxidized ...
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Full-scale control of Mycolata foam by FEX-120 addition
Foaming incidents in activated sludge treatment plants are a worldwide problem and occur on a regular basis in both municipal and industrial activated sludge treatment plants. Foaming is most often caused by excessive growth of filamentous bacteria, especially the gram-positive ones affiliated within the Actinobacteria, e.g. the branched Mycolata or CandidatusMicrothrix parvicella. Previous ...
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ISAM Sequencing batch Reactor375 m3/day - Case study
This project was incorporated as part of an existing municipal treatment plant expansion, and the effluent is discharged to a nearby surface water stream. The plant is now operated by the Ontario Clean Water Agency. H2FLOW EQUIPMENT INC. supplied a complete package with a PARKSON 6mm fine screw screen unit followed by a FLUIDYNE ISAM SBR system including blowers, and a TROJAN UV3000 PTP ...
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Metropolitan Sewer District (MSD), Cincinnati, Ohio U.S.A.: HTFB System
The Metropolitan Sewer District (MSD) of Greater Cincinnati, Ohio is a 90 mgd primary treatment, 55 mgd activated sludge treatment plant. Solids processing includes gravity thickening of primary sludge, dissolved air flotation, thickening of secondary sludge, holding tank storage, belt filter press dewatering and pumping of cake to the old outdated multiple hearth ...
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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 ...
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Polyhydroxyalkanoates (PHA) biosynthesis from kraft mill wastewaters: biomass origin and C:N relationship influence
The goal of this study is to evaluate the feasibility of PHA biosynthesis from kraft mill effluent using the batch system evaluating the biomass origin and C:N relationship influence. To evaluate feasibility, batch assays were carried out. Also, two levels of the BOD5:N:P relationship (100:5:1 and 100:1:0.2) and three different sludge origins were considered. Inocula were obtained from activated ...
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Technical and experimental evaluation of an innovative decentralized technology for the municipal wastewater treatment in the city of Rome
The present paper shows the results obtained through an experimental activity carried out on a pilot-scale plant using an innovative technology which couples the granular aerobic sludge with the sequencing batch process. Treatment efficiency and operation costs were evaluated in order to assess feasibility of this new technology for the upgrading of the existing continuous flow activated sludge ...
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Seasonal movement of trace-element discharge in a typical south-Indian suburban community
Four conventional activated sludge sewage treatment plants (STPs) in Southern India were chosen to investigate the occurrence of major ions and trace metals in dissolved fraction of the wastewater. Samples were collected from inlet and outlet of STPs during the pre-monsoon and monsoon seasons. Except for a few elements (Mn, Mo and Ni), the concentrations of the rest increased at the outlet of ...
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Improvement of the intersection method for the quantification of filamentous organisms: basis and practice for bulking and foaming bioindication purposes
Bulking and foaming phenomena in activated sludge wastewater treatment plants are in most cases related to the abundance of filamentous microorganisms. Quantifying these microorganisms should be a preliminary stage in their control. In this paper, the simplicity of quantifying them based on the intersection method is demonstrated, by redescribing the theory and applying a new improved ...
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The use of rotifers for limiting filamentous bacteria Type 021N, a bacteria causing activated sludge bulking
The excessive growth of filamentous bacteria and the resultant bulking of activated sludge constitute a serious problem in numerous wastewater treatment plants. Lecane inermis rotifers were previously shown to be capable of reducing the abundance of Microthrix parvicella and Nostocoida limicola in activated sludge. In the present study, the effectiveness of four Lecane clones in reducing the ...
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Mixing for Better denitrification with less energy - Case study
Achieving simultaneous nitrification & denitrification in the same basin Topics: mixing, wastewater, activated sludge, energy savings, nitrification, denitrification System Overview: This basin is part of an activated sludge treatment plant serving 17,000 residents with an average influent of five (5) million gallons per day. Basin Build Information: Volume: 4 million gallons Type: ...
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Elevational characteristics of the archaeal community in full-scale activated sludge wastewater treatment plants at a 3,660-meter elevational scale
Due to the important roles of archaea in wastewater treatment processes, archaeal communities have been studied extensively in various anaerobic reactors, but the knowledge of archaeal communities in full-scale activated sludge wastewater treatment plants (WWTPs) remains quite poor. In this study, 454-pyrosequencing was for the first time employed to investigate archaeal communities from 20 ...
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Turning biological waste treatment plant sludge into a fuel source
North Carolina, as part of its landfill regulations, banned all waste treatment plant sludges from general landfills in March, 1989. Cranston Print Works Company was producing approximately 20 tons per day of 18% solid non-hazardous sludge in its extended aeration activated sludge waste treatment plant. Sludge disposal costs were $10,000 per week after the ban took effect. This paper traces the ...
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Cut your wastewater surcharges in half
Water usage and wastewater discharge are a main expenditure for any industrial plant. Biowater’s fixed film wastewater treatment systems reduce your municipal surcharges by at least half. Our systems optimize treatment configurations to help a customer’s Clean-in-place (CIP) and Clean-out-of-place (COP) systems work more efficiently and make sure compliance is achieved. Food ...
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Cut your wastewater surcharges in half
Water usage and wastewater discharge are a main expenditure for any industrial plant. Biowater’s fixed film wastewater treatment systems reduce your municipal surcharges by at least half. Our systems optimize treatment configurations to help a customer’s Clean-in-place (CIP) and Clean-out-of-place (COP) systems work more efficiently and make sure compliance is achieved. Food ...
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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 ...
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High-speed blower unit used to upgrade old equipment - Case Study
Problem The 3.3 mgd (average) activated sludge Charleston (Ill.) Wastewater Treatment Plant needed upgrades to old equipment to reduce operating costs. That included replacing Hoffman multistage aeration blowers, which had served for 40 years with no failures. Solution Superintendent Dave Collard worked with the Hoffman & Lamson, Gardner Denver Products team to install an RO7 Model Hoffman ...
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Cardiff WWTW aeration optimisation through scientific control
Aeration optimisation of a 16 basin SBR plant running in ICEAS (Intermittent Cycle Extended Aeration System) mode was under taken by changing the operating parameters from the traditional design of dissolved oxygen (DO) control to a scientific approach using respirometry. Measuring the critical oxygen point for carbonaceous and nitrification bacteria and combining this with in-situ Oxygen Uptake ...
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Activated sludge microbial community responses to single-walled carbon nanotubes: community structure does matter
The ecological effects of carbon nanotubes (CNTs) have been a worldwide research focus due to their extensive release and accumulation in environment. Activated sludge acting as an important gathering place will inevitably encounter and interact with CNTs, while the microbial responses have been rarely investigated. Herein, the activated sludges from six wastewater treatment plants were ...
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Central Kitsap (USA) Municipal WWTP - Case Study
Number of Tanks: 4 Total Volume: 13,080 m³ Water Depth: 4.75 m SOTR Standard Oxygen Transfer Rate: 1,240 kgO2/h Total Airflow: 10,800 Nm3/h Total AEROSTRIP® Diffusers: 1,214 The Central Kitsap facility started operations in 1979 as a conventional activated sludge secondary treatment plant. The plant receives wastewater from the cities of Silverdale, Keyport and Poulsbo, the Central ...
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