nitrogen removal Articles

  • 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 ...


  • Autotrophic nitrogen removal at low temperature

    In this work the autotrophic nitrogen removal was carried out at moderately low temperatures using two configurations: a) two-units one comprising a SHARON reactor coupled to an Anammox SBR and b) single-unit one consisting of a granular SBR performing the CANON process. At 20°C the two-units system was limited by the Anammox step and its nitrogen removal capacity was around ten times lower than ...


    By IWA Publishing

  • Stormwater nitrogen removal performance of a floating treatment wetland

    The nitrogen (N) removal efficiency and effluent quality of two parallel stormwater retention ponds, one retrofitted with a floating treatment wetland (FTW) and one without any vegetation, was compared in a field trial. This study shows that inclusion of FTWs in stormwater retention ponds has potential to moderately improve N removal. Median FTW outlet event mean concentrations (EMCs) were lower ...


    By IWA Publishing

  • Emerging Models for Nitrogen Removal in Treatment Wetlands

    Engineering textbooks tell a simple story about nitrification and denitrification. Classic nitrification-denitrification theory begins with the bacterial genera Nitrosomonas and Nitrobacter performing ammonia and nitrite oxidation, respectively. Then facultative or obligate anaerobic bacteria denitrify by oxidizing organic carbon with nitrate. Recent advances in environmental microbiology have ...

  • 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

  • Case study - A new system for Nitrogen removal

    South African wastewater facility saves energy and meets nutrient removal regulations Many small communities across the U.S. and around the globe are struggling to meet more stringent nitrification of ammonia requirements on a tighter budget. When a South African community could not meet its state requirements and struggled with a failing rotor disc system, the town’s officials ...

  • Autotrophic nitrogen removal after ureolytic phosphate precipitation to remove both endogenous and exogenous nitrogen

    Anaerobic digestion yields effluents rich in ammonium and phosphate and poor in biodegradable organic carbon, thereby making them less suitable for conventional biological nitrogen and phosphorus removal. In addition, the demand for fertilizers is increasing, energy prices are rising and global phosphate reserves are declining. This requires both changes in wastewater treatment technologies and ...


    By IWA Publishing

  • North American Experience with Centrate Treatment Technologies for Amonia and Nitrogen Removal

    ABSTRACTThe discharge of ammonia and nitrogen to receiving bodies of water is becoming more strictly regulated at municipal wastewater treatment plants throughout North America. The dewatering of anaerobically digested biosolids creates a reject water stream (often referred to as centrate or dewatering filtrate) that can contribute to an additional 15 to 20 percent of the ammonia load to a ...

  • Efficient nitrogen removal for wastewater in compartmentalised activated sludge process

    Studies were conducted on two aerobic-anaerobic configurations of the activated sludge process for nitrogen removal from domestic wastewater. An initial anaerobic stage followed by aerobic, anaerobic and aerobic stages provided best total Kjeldahl nitrogen removal. This profile was selected for conducting further experiments on the effect on nitrogen removal of the hydraulic loading and the food ...


    By Inderscience Publishers

  • Nitrogen removal from raw landfill leachate by an algae–bacteria consortium

    A remediation system for the removal of nitrogen from landfill leachate by a mixed algae–bacteria culture was investigated. This system was designed to treat leachate with minimal inputs and maintenance requirements, and was operated as an open semi-batch reactor in an urban greenhouse. The results of this study showed a maximum nitrogen removal rate of 9.18 mg N/(L·day) and maximum biomass ...


    By IWA Publishing

  • Nitrogen removal from reject water with primary sludge as denitrification carbon source

    A novel system was used for nitrogen removal from reject water. This system includes one anoxic/oxic reactor for nitrification and a special reactor for denitrification in which primary sludge was added intermittently as electron donor. In denitrification reactor, sludge fermentation and denitrification reaction took place simultaneously and promoted each other. It was found that effluent recycle ...


    By IWA Publishing

  • Enhanced nitrogen removal with an onsite aerobic cyclic biological treatment unit

    Coastal Zone Act Reauthorization Amendments (CZARA, Section 6217) necessitate the requirement that onsite wastewater disposal units located near impaired surface waters or groundwater to provide at least 50% nitrogen removal. Approximately 38% of Hawaii households use onsite systems including septic tanks and cesspools that cannot meet this requirement. Upgrades to aerobic ...


    By IWA Publishing

  • Improving total nitrogen removal in aeration basin retrofitted with entrapped biomass

    This study presented a method to upgrade existing aeration tanks to remove total nitrogen (TN). Bioplates carrying entrapped biomass were installed in an aeration basin to create anoxic/anaerobic zones where denitrification can proceed. In a reactor that coupled bioplates containing entrapped biomass (equivalent to as high as 7,500 mg/L of biomass) and an activated sludge suspension (at mixed ...


    By IWA Publishing

  • Biochemical characteristic along UBAF in a one-stage autotrophic nitrogen removal reactor

    The Up-flow biological aerated filter (UBAF) based on a one-stage autotrophic nitrogen removal process has been widely investigated nowadays. In this work, the biochemical characteristic along the volcanic-filled UBAF reactor had been studied. The results indicate that short-rod, spherical and elliptical (averaged 0.2–1.0 μm) microorganisms with a specific irregular cauliflower profile existed ...


    By IWA Publishing

  • Nitrogen removal efficiency and microbial community analysis of ANAMMOX biofilter at ambient temperature

    An upflow anaerobic biofilter (AF) was developed to investigate anaerobic ammonium-oxidizing (ANAMMOX) efficiency in treating low-strength wastewater at ambient temperature (15.3–23.2 °C). Denaturing gradient gel electrophoresis (DGGE) and fluorescence in situ hybridization were used to investigate treatment effects on the microbial community. Stepwise decreases in influent ...


    By IWA Publishing

  • Removal of nitrogen and carbon organic matter by chitosan and aluminium sulphate

    River and lake waters were separated into four fractions to study the removal of nitrogen and carbon organic matter using chitosan (CH) and aluminium sulphate (AS). The fractions were very hydrophobic acid, slightly hydrophobic acid, charged hydrophilic acid and neutral hydrophilic. The results showed that the whole and fractionated water from both sources have a markedly hydrophobic character. ...


    By IWA Publishing

  • Model-based evaluation of mechanisms and benefits of mainstream shortcut nitrogen removal processes

    The main challenge in implementing shortcut nitrogen removal processes for mainstream wastewater treatment is the out-selection of nitrite oxidizing bacteria (NOB) to limit nitrate production. A model-based approach was utilized to simulate the impact of individual features of process control strategies to achieve NO−2-N shunt via NOB ...


    By IWA Publishing

  • Optimizing Nitrogen Removal in a MBR under Abnormal Operating Conditions

    During startup and commissioning of a modified Ludzack-Ettinger (MLE) membrane bioreactor (MBR), Pima County Wastewater Management Division (PCWMD) staff were concerned with the total nitrogen concentration (TN) in the plant effluent. Whereas in the traditional MLE process, increasing recycle ratio increases the TN removal, in this particular process increasing the recycle ratio proved to ...

  • Nitrogen removal in tertiary wastewater treatment plant of a chemical complex

    A Biochemical Contact Oxidation Film (BCOF) technique was piloted for the treatment of a secondary effluent of the Jilin Chemical Industry Corporation (JCIC). The original pulse contact flocculation clarifier used for the tertiary treatment was not performing to the discharge standards. Results show that NH3-N concentration was decreased from 30 mg/L to 15 mg/L, COD concentration was decreased ...


    By Inderscience Publishers

  • Investigation of Nitrification and Nitrogen Removal from Centrate in a Submerged Attached Growth Bioreactor

    The purpose of this study was to investigate the nitrification and nitrogen removal from centrate produced in the dewatering process of an anaerobically digested sludge, using a single-unit, single-zone submerged attached growth bioreactor (SAGB). The nitrogen loading varied from 0.54 - 1.51 kg-N/m3-day and the organic loading varied from 0.07 – 0.64 kg-bCOD/m3-day. The ...

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