digester system Articles
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Fitzgerald, GA - Case Study
Power Savings Original system consisted of 50 HP Orbal system in a digester. This system was replaced with two S&N Airoflo 15 HP Floating Brush Rotors (one unit in 2000, another unit in 2002). The results were improved Mixing and Oygen Levels, with less Energy used. ...
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A simulation analysis model of bucket wheel excavator-conveyor belt system for oil sand extraction and material handling
In this paper, simulation model of 'At Face Slurrying' system is discussed, using a commercial simulation software package Visual SLAM, which involves a Bucket Wheel Excavator-Belt Conveyor-Digester system feeding a slurrification unit. The results show that the BWEs and the apron feeder significantly affected the productivity and surge bin capacity more than the other system components. The ...
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10 years operation experience of thermal hydrolysis projects
Cambi Milestones 1990 - First development work following research work of Li and Noike 1995 – HIAS Norway – first full scale plant – still working very well after 10 years 1998 - 2002 rapid increase in projects, Naestved, Chertsey, Lillehammer, Borregaard, Fredrecia, Aberdeen, Niigate, Dublin – new challenges and risks to be overcome 2000 - 2005 some problem solving Chertsey – fragmented ...
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ATAD control goals through the analysis of process variables and evaluation of quality, production and cost
The aim of this paper is to establish and quantify different operational goals and control strategies in autothermal thermophilic aerobic digestion (ATAD). This technology appears as an alternative to conventional sludge digestion systems. During the batch-mode reaction, high temperatures promote sludge stabilization and pasteurization. The digester temperature is usually the only online, ...
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Treating Municipal Wastewater with the Goal of Resource Recovery. Water Science & Technology
Abstract: A new municipal wastewater treatment flowsheet was developed with the objectives of energy sustainability, and water and nutrient recovery. Energy is derived by shunting a large fraction of the organic carbon in the wastewater to an anaerobic digestion system. Aerobic and anaerobic membrane bioreactors play a key role in energy recovery. Phosphorus and nitrogen are removed from the ...
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Anaerobic Digestion technologies for the treatment of Municipal Solid Waste
Anaerobic Digestion (AD) of Municipal Solid Waste (MSW) is used in several regions worldwide and systems span a range of design options including wet, dry, thermophilic, mesophilic, batch, continuous, single-stage, and multi-stage configurations. This paper reviews a number of commercial and emerging solid waste digestion systems discussing performance and costs. Systems yield 250?710 m³ of ...
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Effect of various leachate recirculation strategies on batch anaerobic digestion of solid substrates
Various leachate recirculation strategies were applied to a batch-wise operated solid-phase digestion system in laboratory-scale tests. Comparative experiments with both continuous and intermittent leachate recirculation revealed no advantages of a continuous flow. Results suggest that leachate recirculation should not be carried out continuously during process initialisation when methanogenesis ...
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Wastewater as a resource: a unique approach to achieving energy sustainability. Water Science & Technology
Abstract: A wastewater-treatment flowsheet was developed to integrate uniquely designed biological processes with physical-chemical unit processes, allowing conversion of the organic carbon in the wastewater to methane, the removal and recovery of phosphorus and nitrogen from the wastewater, and the production of water suitable for reuse. In the flowsheet, energy is derived from the wastewater by ...
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Microwave Digestion Method Applied to Alumina Samples
Aluminum oxide has high thermal and chemical stability, and can be used for high-temperature insulation, making heat shields or protective coatings. When making other materials, the purity of alumina should be very high, and the impurity elements of the material have a great influence on the performance of the final product. When analyzing trace elements in alumina, the most important step is ...
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Extremely fast increase in the organic loading rate during the co-digestion of rapeseed oil and sewage sludge in a CSTR – characterization of granules formed due to CaO addition to maintain process stability
In a co-digestion system running with rapeseed oil and sewage sludge, an extremely fast increase in the organic loading rate was studied to develop a procedure to allow for flexible and demand-driven energy production. The over-acidification of the digestate was successfully prevented by calcium oxide dosage, which resulted in granule formation. Mineralogical analyses revealed that the ...
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Simulta neous determinat ion of nitrite and nitrate in processed foods
Nitrite either alone or in combination with nitrate is added to food to preserve the color and taste and to prevent foods from becoming rancid. They are also used in food for their anti-microbial properties. Higher levels in vegetables and leafy greens are possible from the use of nitrate fertilizers and/or livestock manure. Nitrate can be reduced to nitrite at certain physiological conditions ...
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Assisting microwave digestion systems with Automation for Associated sample workup tasks
Microwave-assisted sample digestion techniques excel in decomposing tough samples completely by raising the temperature of reagents higher than the boiling point. The key to increasing the boiling point of reagents is their entrapment in Teflon® lined close digestion vessels. The usual digestion process starts with the samples being weighed in Teflon® liners and digestion reagents added ...
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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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Radionuclide content of human samples in the Ramsar area of Iran
As part of a survey to determine public exposure to natural radiation and to estimate radionuclide levels in the diet and human tissues, the radionuclide content of different biological samples of residents in Ramsar, a high level background radiation area (HLBRA) in Iran, has been measured. The main route of 210Po and 210Pb intake in the human body is ingestion via foodstuffs. The absorption of ...
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Thick sludge digestion - research design and validation of key process unit operations
ABSTRACTAdvances in the design of anaerobic digesters have seen a trend towards digestion of thicker sludges in the US, UK and elsewhere. This includes a number of new facilities using bolt on technologies to mesophilic anaerobic digestion such as Cambi Thermal Hydrolysis, Prepasteurisation and Biological Hydrolysis. Cambi Thermal hydrolysis utilises thickenedsludge and the digestion process is ...
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The mathematical modelling of biomethane production and the growth of methanogenic bacteria in batch reactor systems fed with organic municipal solid waste
A mathematical model was developed and validated for an anaerobic digestion system of the Organic Fraction of Municipal Solid Wastes (OFMSWs) by using a laboratory-scale system of two Packed Bed Reactors (PBRs). The equations were obtained by the mass balances of methanogenic bacteria of affluent and effluent lixiviated, as well as the interior in each reactor. The methane rate was obtained by ...
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Wastewater as a resource: a unique approach to achieving energy sustainability
A wastewater-treatment flowsheet was developed to integrate uniquely designed biological processes with physical-chemical unit processes, allowing conversion of the organic carbon in the wastewater to methane, the removal and recovery of phosphorus and nitrogen from the wastewater, and the production of water suitable for reuse. In the flowsheet, energy is derived from the wastewater by first ...
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Three years of operation of North America's first nutrient recovery facility
The first full-scale nutrient recovery installation in North America became operational in May 2009 at the Clean Water Service's Durham Advanced Wastewater Treatment Plant in Tigard, Oregon. Recovering ammonia and phosphorus from the dewatering side stream as struvite has a positive impact on plant operations. Significantly reducing the phosphorus recycle lowers the phosphorus loading on ...
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Resuspended contaminated sediments cause sub‐lethal stress to oysters: A biomarker differentiates TSS and contaminant effects
Resuspended contaminated sediments (RCS) represent an important route of contaminant exposure for aquatic organisms. Filter‐feeding organisms are exposed to contaminants, both in the dissolved (at the gills) and particulate form (in the digestive system), during resuspension events. In addition, these organisms must manage the physical stress associated with an increase in total suspended ...
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The Cambi Thermal Hydrolysis Process (THP) – dramatically improving sludge digestion and dewatering
CAMBI MILESTONES 1990 - First development work following research work of Li and Noike 1995 – HIAS Norway – first full scale plant – still working very well after 11 years 1998 - 2002 rapid increase in projects, Denmark, England, Norway, Scotland, Japan, Ireland – new challenges and risks to be overcome 2000 - 2005 some problem solving Chertsey, UK – fragmented engineering, new risks and ...
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