returned activated sludge Articles
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Case Study: Sandy Balls Leisure Centre: Sewage Treatment Plant
A customer with a tough application for a Positive Displacement RAS (Return Activated Sludge) Pump was experiencing high maintenance with the existing submersible unit, requiring lifting of the pump every 3-4 weeks, usually due to solids blockage. NOT a pleasant task regularly lifting from raw sewage! Triangle replaced it with a self-priming Boerger Rotary Lobe Pump. A useful feature of the ...
By Triangle Ltd
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Accelerated anaerobic hydrolysis rates under a combination of intermittent aeration and anaerobic conditions
Anaerobic hydrolysis in activated return sludge was investigated in laboratory scale experiments to find if intermittent aeration would accelerate anaerobic hydrolysis rates compared to anaerobic hydrolysis rates under strict anaerobic conditions. The intermittent reactors were set up in a 240 h experiment with intermittent aeration (3 h:3 h) in a period of 24 h followed by a subsequent ...
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Conversion of the RAS control at the WWTP Asselbrunn to sludge level
The paper presents the effects of gradual upgrade of existing secondary clarifiers of the waste water treatment plant (WWTP) Asselbrunn. From existing two clarifiers at the beginning only one has been modified (clarifier no. 2), while the other remained unchanged (clarifier no. 1). In a first step the intake structure of clarifier no. 2 has been modified at flow proportional return activated ...
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BM Respirometry Study Toxicity & Biodegradability of a Refinery polymer stream, when treated in the activated sludge process of the plant - Case Study
This “batch system” respirometer consists of: a single thermostatically controlled vessel, divided into two interconnected compartments with closed recirculation loop between the two. A constant air flow is supplied via a ceramic diffuser in the conditioning compartment, and a combined oxygen/temperature sensor in the reaction compartment controls the DO and temperature. Both ...
By SURCIS, S.L.
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A multi-parameter analyzer helps a Kentucky treatment plant step up to the plate and meet a new phosphorus limit in its permit
In 2001, the Lexington Fayette Urban County Government West Hickman Creek Wastewater Treatment Plant in Nicholasville, Ky., was starting Phase II of its third upgrade since 1972, when the state imposed a phosphorus limit. Total phosphorus hovered around 6 mg/l, but the permit required 1 mg/l monthly average and 2 mg/l daily maximum from May through October. Engineers from Tetra-Tech, the ...
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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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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 ...
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MBBR Wastewater Treatment - 5 Top Advantages
Modular wastewater treatment solutions have become very important to treat waste water. Water scarcity has become an important issue worldwide, requiring strategies for both water conservation and effective water and wastewater treatment. Several technologies have been in practice for generations including the conventional activated sludge process. MBBR wastewater treatment is a relatively new ...
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Scanning success - Case Study
Scanning Success: A multiparameter analyzer helps a Kentucky treatment plant step up to the plate and meet a new phosphorus limit in its permit In 2001, the Lexington Fayette Urban County Government West Hickman Creek Wastewater Treatment Plant in Nicholasville, Ky., was starting Phase II of its third upgrade since 1972, when the state imposed a phosphorus limit. Total phosphorus hovered around ...
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Crown point wastewater treatment plant case study
Project Summary Due to capacity issues, the City of Crown Point was forced to either start planning for expensive capital expansions of the facility or to investigate alternative technologies that would increase capacity. In 2007 the City chose In-Pipe Technology to improve the treatment capacity of the plant without capital improvements. In-Pipe's goal is to improve the efficiency of the plant, ...
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Sequencing batch reactor
Sequencing batch reactors (SBR) sequential batch reactors are industrial processing tanks for the treatment of wastewater. SBR reactors treat waste water such as sewage or output from anaerobic digesters or mechanical biological treatment facilities in batches. Oxygen is bubbled through the waste water to reduce biochemical oxygen demand (BOD) and chemical oxygen demand (COD) to make suitable for ...
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Sequencing batch reactor
Sequencing batch reactors (SBR) or sequential batch reactors are industrial processing tanks for the treatment of wastewater. SBR reactors treat waste water such as sewage or output from anaerobic digesters or mechanical biological treatment facilities in batches. Oxygen is bubbled through the waste water to reduce biochemical oxygen demand (BOD) and chemical oxygen demand (COD) to make suitable ...
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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 effluent ammonia. The ...
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Fluence MABR Aces Stanford University Test
Yearlong test of revolutionary wastewater treatment certifies MABR’s compliance with Title 22 nonpotable reuse After a yearlong pilot test of Fluence’s membrane aerated biolfilm reactor (MABR) wastewater treatment technology at Stanford University’s Codiga Resource Recovery Center (CR2C), the CRC2 team has published interim results declaring it a success. The testing ...
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Case study - Pure oxygen injection pilot test
Introduction: The Moccasin Bend WWTP uses pure oxygen produced by a cryogenic oxygen plant for activated sludge treatment of the influent waste stream, which consists of municipal and industrial wastes. The waste stream contains a high proportion of high strength industrial waste, which results in a typical COD loading of about 2000 mg/L, which is approximately four times the strength of normal ...
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WWTP Monclova, Mexico A Case Study
Case Study: Municipal WWTPClient: Monclova – MexicoStart Up: 2005Capacity: 58,300 m3/d Overview The 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. Requirements The city of Monclova operates a modern wastewater treatment plant which receives urban and industrial wastewater. A retrofit for an ...
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Aerobic Wastewater Treatment Options
Aerobic wastewater treatment ranges from the simple to revolutionary technologies like MABR, which saves energy and is ideal for decentralized treatment Aerobic wastewater treatment takes many forms, but fundamentally it’s a biological process widely used in the treatment of both domestic and industrial wastewater, particularly waste streams high in organic or biodegradable content. ...
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7 Disadvantages of Using an Activated Sludge Process for Your Municipality or Company
7 Disadvantages of the Activated Sludge Process for Municipalities and Organization Biological treatment processes are an important component in many wastewater treatment systems. They are one of the most efficient and effective ways of reducing organic material in wastewater. There are quite a few of them that have been researched and used over several decades. However, one of the most widely ...
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How to Choose the Correct Biological Wastewater Treatment Process for Your Application
There is different discharge restrictions for wastewater produced by different sectors and industries. Treatment systems need to be designed around each individual application in order to specifically target and treat the pollutants produced by them. This is why it is important to choose the correct biological wastewater treatment process for secondary stage wastewater treatment. When choosing ...
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7 Disadvantages of Implementing an Activated Sludge Process For Your Municipality or Company
Biological treatment processes are an important component in many wastewater treatment systems. They are one of the most efficient and effective ways of reducing organic material in wastewater. There are quite a few of them that have been researched and used over several decades. However, one of the most widely used conventional biological treatment process is the activated sludge process (ASP). ...
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