nitrogen reduction Articles

  • White Paper: Cyclical Aeration Control- Combining Aerobic & Anoxic Conditions in One Basin

    Increase Water Quality with Cyclical Aeration With increased effluent pollution restrictions on municipal wastewater treatment plants, cities are pressed to find ways to economically increase their effluent quality with little to no funding. Many new NPDES permits ...

  • Onsite wastewater nitrogen reduction with expanded media and elemental sulfur biofiltration

    A passive biofiltration process has been developed to enhance nitrogen removal from onsite sanitation water. The system employs an initial unsaturated vertical flow biofilter with expanded clay media (nitrification), followed in series by a horizontal saturated biofilter for denitrification containing elemental sulfur media as electron donor. A small-scale prototype was operated continuously over ...


    By IWA Publishing

  • Reduction and control of total Nitrogen in a cheese factory case study

    Treatment system enhancement using Microcat - DEN Denitrifiers - BSE 099 Problem The wastewater treatment system receiving wastewater from a cheese factory in the EU has difficulty meeting total nitrogen effluent discharge requirements. The wastewater flow rate is 2000 cubic meters per day. The treatment system consists of two sequencing batch reactors (SBRs) ...


    By Bioscience, Inc.

  • Problem solving bulk reduction

    The plant, built by Tanks and Vessels, processes food and vegetable waste with the help of Mono’s progressing cavity pumps and Munchers. The organic material is fed into the process in its raw form where it is finely macerated by a Mono Muncher. The homogenous slurry is then transferred to the digestion tanks to produce a useful end product, liquid soil conditioner, which can be sold to ...

  • Problem solving bulk reduction

    The plant, built by Tanks and Vessels, processes food and vegetable waste with the help of Mono’s progressing cavity pumps and Munchers. The organic material is fed into the process in its raw form where it is finely macerated by a Mono Muncher. The homogenous slurry is then transferred to the digestion tanks to produce a useful end product, liquid soil conditioner, which can be sold to ...

  • Effluent Compliance/Biological nutrient removal performance focus: Nitrogen reduction case study

    In-Pipe Technology Company, Inc., improves water quality for discharge or reuse by reducing influent organic loading and effluent pollutant levels. In-Pipe Technology has helped compliant plants function more efficiently and helped non-compliant plants achieve their targets. In-Pipe Technology works with both conventional treatment processes and advanced treatment designs including biological ...

  • Study on nitrogen load reduction efficiency of agricultural conservation management in a small agricultural watershed

    Different crops can generate different non-point source (NPS) loads because of their spatial topography heterogeneity and variable fertilization application rates. The objective of this study was to assess nitrogen NPS load reduction efficiency by spatially adjusting crop plantings as an agricultural conservation management (ACM) measure in a typical small agricultural watershed in the black ...


    By IWA Publishing

  • Floating wetland islands as a method of nitrogen mass reduction: results of a 1 year test

    Floating wetland islands (FWIs) were tested in Pasco County, Florida, as a method of reducing total nitrogen (TN) in reclaimed water during reservoir storage. The Pasco County Master Reuse System (PCMRS) is a regional reclaimed-water transmission and distribution system providing wastewater effluent disposal for the county. Total daily mass loading from reclaimed water is limited by nitrogen ...


    By IWA Publishing

  • Using excess sludge as carbon source for enhanced nitrogen removal and sludge reduction with hydrolysis technology

    In order to improve the nitrogen removal efficiency and to achieve the sludge reduction in traditional wastewater treatment plants, a combined hydrolysis-anoxic-oxic (H-A-O) pilot-scaled reactor was used in this study to investigate the possibility and validity of using excess activated sludge (EAS) fermentation liquids to enhance the nitrogen removal. The results clearly showed that sludge ...


    By IWA Publishing

  • Evaluation of the equations of state for air, nitrogen and oxygen on throttle reduction efficiency by using exergy analysis

    Exergy (available energy) analysis was applied to calculate the efficiency of throttling process by using some of equations of state. Differences between calculations by using three equations of state, Soave?Redlich?Kwong (S?R?K), Van der Waals and Beattie?Bridgeman on three substances air, nitrogen and oxygen are shown. The calculations for nitrogen are found to be close to air because almost ...


    By Inderscience Publishers

  • Development of a water quality tank model classified by land use for nitrogen load reduction scenarios

    The Ariake Sea, a typical semi-closed bay located in Kyushu Island, western Japan, has a maximum tidal range of 6 m in spring tide, and its vast tidal flats are composed of both sandy bottom areas and muddy bottom areas. In this study, two-dimensional depth-averaged finite difference numerical models have been developed for predicting the tidal flow velocity and suspended sediment concentration ...


    By Springer

  • Successful reduction of diffuse nitrogen emissions at catchment scale: example from the pilot River Odense, Denmark

    Land-based total nitrogen (N) loadings to Danish coastal waters have been markedly reduced since 2000. This has been achieved by general measures reducing discharges from all point sources and N leaching from farmed land supplemented with more local and targeted mitigation measures such as restoration of wetlands to increase the catchment-specific N retention. In the catchment of River Odense, ...


    By IWA Publishing

  • Sludge reduction and performance analysis of a modified sludge reduction process

    A modified sludge process reduction activated sludge (SPRAS) technology was developed by inserting a sludge process reduction (SPR) module, composed of an aeration tank and a settler, before the activated sludge system was proposed in this study. Compared with the anaerobic/anoxic/aerobic (AAO) process, the SPRAS resulted in a remarkable decrease in sludge production by 76.6%; sludge ...


    By IWA Publishing

  • WWTP Sludge reduction case study

    Introduction The City of Spring Valley, IL was seeking bioaugmentation to reduce the economic burden of sludge dredging and disposal and to evaluate the possibility of restoring the microbiological activity in the lagoon. The lagoon was flooded several times from the near-by Illinois River, which created different strata of inorganic silt/organic sludge and densely packed sludge at the ...

  • Major Breakthrough in Wastewater Nitrogen Removal

    Working together in close collaboration, the Hollandse Eilanden en Waarden Water Authority (Zuiveringsschap Hollandse Eilanden en Waarden, ZHEW) and Paques are pleased to announce the world's first system for sustainable nitrogen removal from waste water. In May of next year, an Anammox® system will be opened in the Dokhaven waste water purification plant of ZHEW in Rotterdam. Through the ...


  • A simulation of the fate of nitrogen in an on-site wastewater treatment system

    An experiment to study and to build a mathematical model to reproduce the behavior of nitrogen in a residential wastewater treatment process was performed. A pilot unit receiving grey and black water was used. The pilot consisted in a septic tank followed by a fixed-film, partly aerated bioreactor with effluent recirculation operated under two different scenarios: normal operating conditions and ...


    By IWA Publishing

  • Layered Reduction Technologies for Effective NOx Control

    The control of nitrogen oxides (NOx) is a well-known requirement for utility and industrial furnaces alike.  Although the regulations and corresponding emission limits vary greatly, the need for substantial reduction is becoming universal.  There are a few existing NOx reduction technologies which have been proven effective in a variety of applications.  The most appropriate ...


    By Fuel Tech, Inc.

  • Nitrite reduction and methanogenesis in a single-stage UASB reactor

    In this study, nitrite reduction and methanogenesis in a single-stage upflow anaerobic sludge blanket (UASB) reactor was investigated, using high-strength synthetic domestic wastewater as substrate. To assess long-term effects and evaluate the mechanisms that allow successful nitrite reduction and methanogenesis in a single-stage UASB, sludge was exposed to relatively high nitrite loading ...


    By IWA Publishing

  • Oxygen-separation membranes could aid in CO2 reduction

    Ceramic membranes may reduce carbon dioxide emissions from gas and coal-fired powerplants. Written by Jennifer Chu, MIT News Office.You can read the original new in MIT NewsIt may seem counterintuitive, but one way to reduce carbon dioxide emissions to the atmosphere may be ...

  • Enhanced nitrogen removal in trickling filter plants

    The Beaudesert Sewage Treatment Plant (STP), originally built in 1966 and augmented in 1977, is a typical biological trickling filter (TF) STP comprising primary sedimentation tanks (PSTs), TFs and humus tanks. The plant, despite not originally being designed for nitrogen removal, has been consistently achieving over 60% total nitrogen reduction and low effluent ammonium concentration of ...


    By IWA Publishing

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