nutrient removal Articles
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Warrenton Nutrient Removal - Case Study
Renovation of an existing wastewater plant to include methanol feed, denitrification filters, a pump station and electrical ...
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Biological nutrient removal in a continuous biofilm process
A new biological phosphorous and nitrogen removal process is developed. The process is based on biofilm on carrier elements with enhanced biological phosphorous removal and simultaneous nitrification and denitrification in a continuous process. Results from 3 years of pilot and laboratory experiments are presented with regards to removal of organic substances, phosphorous and nitrogen. This ...
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Project - Village Down River
The village down River is a development of luxury homes located on the grounds of what was once the White Hall Manor Estate. In more recent times the waterfront was used as home base for the Menhaden fishing fleet. The luxury housing development is being built using environmentally friendly standards. Walden was chosen to supply the treatment system for the project based on our nutrient removal ...
By Walden, Inc.
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Nutrient Control Design Manual
The purpose of this EPA design manual is to provide updated, state‐of‐the‐technology design guidance on nitrogen and phosphorus control at municipal Wastewater Treatment Plants (WWTPs). Similar to previous EPA manuals, this manual contains extensive information on the principles of biological nutrient removal and chemical phosphorus removal to serve as the basis for design. A ...
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Oxygen transfer in activated sludge – new insights and potentials for cost saving
The α-factor has the greatest impact on the calculation of the required standard oxygen transfer rate (SOTR) in activated sludge systems equipped with submerged aeration systems. Knowing the dependencies of the α-factor leads to a better design of the aeration devices and, consequently, to a more efficient use of aeration energy. Applying the current state of knowledge about oxygen transfer leads ...
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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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Evaluation of nutrients removal (NO3-N, NH3-N and PO4-P) with Chlorella vulgaris, Pseudomonas putida, Bacillus cereus and a consortium of these microorganisms in the treatment of wastewater effluents
In this research removal of NH3-N, NO3-N and PO4-P nutrients from municipal wastewater was studied, using Chlorella vulgaris, Pseudomonas putida, Bacillus cereus and an artificial consortium of them. The objective is to analyze the performance of these microorganisms and their consortium, which has not been previously studied for nutrient removal in municipal wastewater. A model wastewater ...
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Effects of physical and morphometric factors on nutrient removal properties in agricultural ponds
Effects of physical and morphometric factors on nutrient removal properties were studied in small agricultural ponds with different depths, volumes, and residence times in western Japan. Average residence time was estimated to be >15 days, and it tended to decrease from summer to winter because of the increase in water withdrawal for agricultural activity. Water temperature was clearly ...
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Nitrification and denitrifying phosphorus removal in an upright continuous flow reactor
Simultaneous nitrification and denitrifying phosphorus removal was achieved in a single-sludge continuous flow bioreactor. The upright bioreactor was aligned with a biomass fermenter (BF) and operated continuously for over 350 days. This study revealed that unknown bacteria of the Saprospiraceae class may have been responsible for the successful nutrient removal in this bioreactor. The ...
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Effects of nutrient loading on Anabaena flos-aquae biofilm: biofilm growth and nutrient removals
Effects of three different nutrient loadings (low nutrient loading, medium nutrient loading and high nutrient loading, denoted as LNS, MNS and HNS, respectively) on the structure and functions of algal biofilm using Anabaena flos-aquae were investigated using synthetic wastewater. Nutrients removal efficiencies, biofilm thickness, microalgae dehydrogenase activity (DHA) and exopolysaccharide ...
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Nutrient removal from activated sludge mixed liquor by wastewater protozoa in a laboratory scale batch reactor
The aim of the study was to investigate the nutrient removal rate of three wastewater protozoan isolates. The study was carried out in a laboratory-scale batch reactor for a period of 120 h. in a four batch study. Aliquot samples were withdrawn from the reactor every 24 h. for the analysis of phosphate, nitrate, nitrite, ammonia, chemical oxygen demand, dissolved oxygen and pH, using standard ...
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WEF/WERF study of BNR plants achieving very low N and P limits: evaluation of technology performance and process reliability
The Water Environment Research Foundation (WERF) funded a two-year comprehensive study of nutrient removal plants designed and operated to meet very low effluent total nitrogen (TN) and total phosphorus (TP) concentrations. WERF worked with the Water Environment Federation (WEF) to solicit participation of volunteers and provide a forum for information exchange at workshops at its annual ...
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Nutrient removal ability and resistance of five hydrophytes under low-temperature conditions
Five indigenous hydrophytes were studied for removal of nitrogen and phosphorus at different nutrition levels by artificial imitation of the low-temperature weather conditions of the Taihu lake area. The rate of nitrogen and phosphorus uptake was dependent on the nutrient concentrations and a positive correlation between the prolines of hydrophytes and the latter were found. High percentages of ...
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Ammonium nitrogen removal in batch cultures treating digested piggery wastewater with microalgae
Oedogonium sp.Due to the nutrient characteristics of the high concentration of available ammonium in digested piggery wastewater (DPW), microalgae can be used to treat DPW before its final discharge. Four green microalgae (Hydrodictyaceae reticulatum Lag, Scenedesmus obliquus, Oedogonium sp. and Chlorella pyrenoidosa) and three blue-green algae (Anabaena flos-aquae, Oscillatoria amoena Gom and Spirulina ...
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Nitrogen And Phosphorus Removal In Substrate-Free Pilot Constructed Wetlands With Horizontal Surface Flow In Uganda
In constructed wetlands (CWs) with horizontal sub-surface flow, nutrient removal, especially phosphorus, is limited because the root biomass fills the pore spaces of the substrate (usually gravel), directing wastewater flow to deeper wetland media, plants are not regularly harvested, the litter formed by decomposing vegetation remains on the surface of the substrate and thus does not interact ...
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The role and control of sludge age in biological nutrient removal activated sludge systems
The sludge age is the most fundamental and important parameter in the design, operation and control of biological nutrient removal (BNR) activated sludge (AS) systems. Generally, the better the effluent and waste sludge quality required from the system, the longer the sludge age, the larger the biological reactor and the more wastewater characteristics need to be known. Controlling the reactor ...
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Evaluation of Several Water Reclamation Facilities Employing Biological Nutrient Removal in North Carolina
Abstract As an increasing number of lakes and streams are being classified as impaired or nutrient sensitive, a greater burden is placed on municipalities to comply with water quality restrictions. During the past decade in North Carolina, specifically in the Neuse River and Tar-Pamlico River Basins, many municipalities were required to upgrade their wastewater treatment plants for nutrient ...
By Arcadis
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Treatability and fate of various phosphorus fractions in different wastewater treatment processes
The increasingly more stringent phosphorus (P) discharge limits, which are below the concentrations reliably achievable with currently available technologies, demand for better understanding of phosphorus removal mechanisms. This study investigated the compositional fractions of phosphorus (P) in various effluents as well as the efficacy of different levels of treatment processes for removing ...
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Identification and evaluation of a dominant alga from municipal wastewater in removal of nutrients
To access better removal of nutrients with algae-based techniques, a dominant alga from real municipal wastewater was identified and its capacity in removing low concentrations of nitrogen (NH+4 or NO−3) and phosphorus (PO3−4) was evaluated. Results showed that Oedogonium brevicingulatum, a filamentous green alga, was confirmed as the dominant alga in the secondary effluent of a municipal ...
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Vertical flow constructed wetlands: kinetics of nutrient and organic matter removal
The kinetics of organic matter and nutrient removal in a pilot vertical subsurface wetland with red ferralitic soil as substrate were evaluated. The wetland (20 m2) was planted with Cyperus alternifolius. The domestic wastewater that was treated in the wetland had undergone a primary treatment consisting of a septic moat and a buffer tank. From the sixth week of operation, the performance of ...
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