nitrogen removal system Articles
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A new approach to energy-efficient treatment of wastewater produced by the fish industry in Vietnam
Economic growth in Vietnam in the last few years has brought about an increasing demand for energy and has had a severe environmental impact. Fish processing is one of the fastest-growing industries that discharge organically-polluted wastewater. To counter these environmental problems, new technologies for energy-efficient treatment are needed. By coupling innovative nitrogen removal systems ...
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pH variation and influence in an autotrophic nitrogen removing biofilm system using an efficient numerical solution strategy
A pH simulator consisting of an efficient numerical solver of a system of nine nonlinear equations was constructed and implemented in the modeling software MATLAB. The pH simulator was integrated in a granular biofilm model and used to simulate the pH profiles within granules performing the nitritation–anammox process for a range of operating points. The simulation results showed that pH ...
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New septic system at no cost?
DEAL ISLAND -- When Robert Archibald heard that Maryland offers free septic system upgrades, his gut response was one of, well, skepticism. After all, his house in Deal Island had a septic system that after more than 30 years of use was working just fine, he said. Additionally, what things in life -- no less, from government -- are actually free, he wondered? Two months ago, spurred in part by ...
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Inhibition kinetics and granular sludge in an ANAMMOX reactor treating mature landfill leachate
The present study reports the inhibition kinetics and granular sludge in an anaerobic ammonium oxidation (ANAMMOX) – up-flow anaerobic sludge blanket reactor fed with diluted mature landfill leachate. The activity of ANAMMOX bacteria was inhibited by addition of mature landfill leachate, but gradually adapted to the leachate. The system achieved efficient nitrogen removal during 65–75 d and ...
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Laboratory study on factors influencing nitrogen removal in marble chip biofilters incorporating nitritation and anammox
It remains challenging to integrate nitritation and anammox in ecologically engineered treatment systems such as passive biofilters that are packed with natural materials and have low energy inputs. This study explored the factors influencing nitritation-anammox through parallel operation of two laboratory-scale biofilters packed with large and small marble chips respectively. Clean marble chips ...
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Microbial characteristics of a CANON reactor during the start-up period seeding conventional activated sludge
An up-flow oxygen-controlled biofilm reactor filled with volcanic filter was used for a completely autotrophic nitrogen-removal over nitrite (CANON) process. The reactor was successfully established by seeding conventional activated sludge at ambient temperature without additional biomass inoculation. An average total nitrogen (TN) removal rate of 1.1 kg·(m3 d)−1 was achieved ...
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Investigation of OUR and NUR experiments for nitrogen and phosphorus removal with activated sludge: a lab-scale study
Activated sludge systems are widely used in wastewater treatment. Organic carbon removal and nutrient removal are important for stringent water discharge standards. Therefore, activated sludge systems are widely used to remove carbon, nitrogen and phosphorus in new wastewater treatment systems or upgrades of existing systems. The determination of system compounds and kinetic parameters for ...
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Experiences from the full-scale implementation of a new two-stage vertical flow constructed wetland design
This paper describes the results of the first full-scale implementation of a two-stage vertical flow constructed wetland (CW) system developed to increase nitrogen removal. The full-scale system was constructed for the Bärenkogelhaus, which is located in Styria at the top of a mountain, 1,168 m above sea level. The Bärenkogelhaus has a restaurant with 70 seats, 16 rooms for ...
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Better water, Better world.
An experiment to test nitrogen-removing septic systems in southern Hood Canal was launched Monday with the installation of a small treatment device at a home near Twanoh State Park. Environmental Earth Systems installed a commercial treatment unit designed to fi t into an existing septic tank. The unit, called RetroFAST, is manufactured by Bio-Microbics of Shawnee, Kan. It includes a blower that ...
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WERF Nutrient Challenge investigates limits of nutrient removal technologies
The WERF Nutrient Challenge is a multi-year collaborative research initiative established in 2007 to develop and provide current information about wastewater treatment nutrients (specifically nitrogen and phosphorus in wastewater), their characteristics, and bioavailability in aquatic environments to help regulators make informed decisions. The Nutrient Challenge will also provide data on ...
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Bioelectrochemical nitrogen removal as a polishing mechanism for domestic wastewater treated effluents
Addition of an external carbon source is usually necessary to guarantee a sufficiently high C/N ratio and enable denitrification in wastewater treatment plants (WWTPs). Alternatively, denitrification processes using autotrophic microorganisms have been proposed i.e., with the use of H2 as electron donor or with the use of cathodic denitrification in bioelectrochemical systems (BES), in which ...
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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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General Oxygen Requirements for Wastewater Treatment
TECHNICAL BULLETIN 135 General Oxygen Requirements for Wastewater Treatment Oxygen requirements for municipal wastewater treatment can be predicted closely with the standard laboratory analysis using g the BOD test (special requirements exist for some industrial wastewater). The BOD test is designed to measure Biological Oxygen Demand for the wastewater and provides an excellent basis for ...
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Alternative biological systems for the treatment of vinasse from wine
This work studied alternative treatment schemes for the vinasse wastewater from wine distilleries aiming at overcoming the problems caused by the high nitrogen and sulfur concentrations. A plexiglas laboratory-scale upflow anaerobic sludge blanket (UASB) reactor of 20 L volume that was operated at 45°C and hydraulic retention time 1 d, was included in all the examined systems. System 1 was the ...
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Shall we upgrade one-dimensional secondary settler models used in WWTP simulators? – An assessment of model structure uncertainty and its propagation
In WWTP models, the accurate assessment of solids inventory in bioreactors equipped with solid-liquid separators, mostly described using one-dimensional (1-D) secondary settling tank (SST) models, is the most fundamental requirement of any calibration procedure. Scientific knowledge on characterising particulate organics in wastewater and on bacteria growth is well-established, whereas 1-D SST ...
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Recovery of ammonium from digestate as fertilizer
Ammonia inhibition can be a major problem during anaerobic digestion of manure and municipal and industrial sludges. Anaerobic digestion is sensitive to higher NH3-N concentrations, which are inhibiting and at certain levels even toxic for methanogen bacteria. The Nijhuis Ammonium Recovery (AECO-NAR) system can solve this problem and removes ammonium from digestate or other substrate for ...
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Top Applications of Shortcut Nitrogen Removal
Skipping a step streamlines treatment of a range of high-ammonia wastewater sidestreams Over the years there has been an ongoing quest to make wastewater nutrient removal more efficient than traditional activated sludge treatment, which is effective but uses a great deal of energy, carbon, and oxygen. There has been progress, starting with full nitrification-denitrification and simultaneous ...
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Advanced nitrogen removal using pilot-scale SBR with intelligent control system built on three layer network
Since eutrophication has become increasingly severe in China, nitrogen and phosphorous have been the concern of wastewater treatment, especially nitrogen removal. The stabilization of the intelligent control system and nitrogen removal efficiency were investigated in a pilot-scale aerobic-anoxic sequencing batch reactor (SBR) with a treatment capacity of 60 m3/d. Characteristic points on the ...
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What is Shortcut Nitrogen Removal?
This streamlined process, used in Fluence’s Nitro plants, lets you deal with high-load sidestreams efficiently Two common goals for wastewater treatment plants are nitrogen removal and energy neutrality, but in traditional biological treatment processes, the energy requirements for mixing and aeration are high. Carbon and chemicals to control pH levels also are required. The shortcut ...
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Aeration control – a review
This review covers automatic control of continuous aeration systems in municipal wastewater treatment plants. The review focuses on published research in the 21st century and describes research into various methods to decide and control the dissolved oxygen (DO) concentration and to control the aerobic volume with special focus on plants with nitrogen removal. Important aspects of control ...
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