nitrification rate Articles

  • Influence of shear on nitrification rates in a membrane bioreactor

    Grundfos BioBooster (GBB) installed and operated a membrane bioreactor (MBR) test plant in 2012. During the period it became evident that the nitrification rate was lower than expected and a study was carried out to investigate the possible reasons for the observed low-nitrification rate. Tests were conducted at a pilot plant and the effect of shear from the BioBooster membrane system and the ...


    By IWA Publishing

  • Temporal variation in maximum cell-specific nitrification rate

    The cell numbers of ammonia-oxidising bacteria (AOBs), Nitrospira and Nitrobacter in activated sludge used to treat wastewater from a thermal power plant in Japan were examined for nine months using a real-time PCR quantification technique. AOB cell numbers ranged 2.8 × 1010–2.3 × 1011 cell/L. The amoA clone analysis showed that the only Nitrosomonas ...


    By IWA Publishing

  • High-Rate Nitrification by CO2-Sensitive Nitrifying Bacteria

    High-rate nitrification has been observed in a lab-scale activated sludge reactor using synthetic wastewater under increased (1%) pCO2. The populations found in the reactors were challenged by drastically reducing the solids retention time to cause washout of slow growing bacteria. Under conditions of increased pCO2 the experimental reactor maintained a nitrification rate that was 5 times higher ...

  • Inhibition of unwanted nitrification

    Respirometer The respirometer utilized in this study corresponds to the BM-Advance model, with the following main features: Compact analyzer, with very low maintenance and user friendly operation Direct oxygen measurements from a maintenance-free oxygen sensor No oxygenation restriction during test performance Full control and results by ...


    By SURCIS, S.L.

  • The influence of aeration rate on partial nitrification in sequencing batch reactor

    Partial nitrification was investigated in Sequencing Batch Reactor (SBR) under aeration of 100, 500, 1000 and 1600 ml min−1. The biomass concentration was about 1.7 g l−1. When the ratio of alkalinity (mg l−1) to NH4+ -N (mg l−1) was 7.14 : 1, pH and DO would both increase dramatically after ammonia oxidation finished. Through monitoring and controlling the variation of pH and DO in the reactor, ...


    By Inderscience Publishers

  • Case of Study – Low nitrification

    BM Respirometer The respirometer utilized for the study was a BM-T, provided with external thermostatic unit (bath) This “batch system” respirometer consists of: a single reactor vessel, divided into two interconnected compartments with closed recirculation loop between the two. Both compartments are kept completely mixed by means of paddle stirrers and a peristaltic recirculation A ...


    By SURCIS, S.L.

  • Tertiary Nitrification Process - Case Study

    Our nitrification process was originally developed for ammonia removal from activated sludge final effluent. However, it has since been applied to sludge liquor ("reject water", "centrate" or "filtrate") treatment. It is also suitable for nitrification of potable water sources (e.g. surface or ground water) prior to chlorination, to reduce the formation of chloramines. Ammonia removal down to 1 ...

  • Kinetic study of compost liquor nitrification

    This study is a first kinetic approach about the compost liquor treatment by activated sludge. This industrial wastewater is highly loaded in organic and nitrogen compounds (COD≈12,000 mg L−1 and NH4+-N≈4,000 mg L−1). The possibility of its treatment in an urban WWTP is studied measuring ammonia oxidation rate with non-acclimated sludge to the industrial effluent. Compost liquor appears as an ...


    By IWA Publishing

  • Maintaining Nitrification During Cold Weather

    Cold weather can turn wastewater plants topsy-turvy, upending all one’s hard work to maintain compliance. When you are attempting to maintain adequate nitrification in your wastewater treatment plant (WWTP) to ensure that nitrogen associated permit limits such as Ammonia-Nitrogen (NH3-N), Total Kjeldahl Nitrogen (TKN), and Total Nitrogen (TN) are met, it is essential to stay on ...

  • Evaluating the effects of nitrogen loading rate and substrate inhibitions on partial nitrification with FISH analysis

    The effects of free ammonia (FA) or free nitrous acid (FNA) on partial nitrification (PN) has been well investigated. Nevertheless, little information was known about the combined effects of nitrogen loading rate (NLR) and substrate inhibition, as well as the impact on the community structure of nitrifiers. In this work, real reject water was treated in a pre-denitrification reactor. PN was ...


    By IWA Publishing

  • Nitrification of centrate from dewatering of anaerobically digested sludge

    Nitrification of anaerobically digested sludge centrate was studied in bench-scale suspended growth and fixed film enhanced suspended growth systems at temperatures of 10.5-28.5°C and pH values of 6.0-9.1. Nitrification followed zero-order kinetics in both systems, and ammonia removals in excess of 99% were observed. The temperature dependency of the suspended growth nitrification rate ...


    By Inderscience Publishers

  • Simultaneous Nitrification and Denitrification through Low-DO Operation

    Single-tank simultaneous nitrification and denitrification (SNdN) processes can potentially eliminate the need for separate tanks and for recycling mixed liquor from oxic nitrifying zones to the typically upstream anoxic zones for denitrification. However, the conditions involved are more susceptible to sludge bulking by excessive growth of filamentous bacteria. This study was aimed at ...

  • Achieving nitrification in sewage lagoons with an innovative floating RBC

    The research involved the newly developed floating rotating biological contactor (FRBC), a unique unit consisting of a rotating cage filled with hollow, spherical packing of injection molded plastic. The cage rotates to provide biomass a chance to contact both substrate and air. A partially mixed three-cell aerated lagoon was selected for the study. The lagoon received about 114 m3/d of domestic ...

  • Integration of nitrification and denitrification by combining anoxic and aerobic conditions in a membrane bioreactor

    A membrane bioreactor (MBR) was developed to achieve nitrogen removal by combining nitrification and denitrification conditions in one reactor. The activated sludge was alternated between aerobic and anoxic conditions using peristaltic pump. The biomass concentration and floc morphological properties were observed to be similar in anoxic and aerobic compartments. However, the homogeneous ...


    By IWA Publishing

  • Nitrous oxide formation during nitritation and nitrification of high-strength wastewater

    The purpose of this study was to investigate the formation of nitrous oxide (N2O) in nitritation and nitrification under stable, comparable and not limiting conditions typical for treatment of high-strength wastewater. A laboratory-scale aerated chemostat was operated with reject water at different sludge retention times, achieving suppression of nitrate formation by wash-out of ...


    By IWA Publishing

  • Column-Based Remediation of Groundwater Nitrogen via Stimulation of Nitrification and Denitrification

    ABSTRACT: A former research laboratory facility utilized a leach field for sanitary and aqueous laboratory waste. Surrounding soils and groundwater are impacted by ammonia and pH varies between 3.6 and 5. The feasibility of employing an in-situ, two-stage, nitrification/denitrification program was evaluated via a soil column study. The objectives of the study were to a) determine the efficacy of ...

  • Application of nitrifying granules to improvement of nitrification activity in activated sludge process

    Nitrifying granules were used to improve nitrification performance of activated sludge process under high organic load. After inoculation of nitrifying granules, nitrification activity immediately increased, and kept for at least 70 days. Fluorescence in situ hybridisation analysis confirmed that nitrifying bacteria were retained in the granules even though nitrifying granules had been served in ...


    By Inderscience Publishers

  • Nitrification of saline, inhibitory chemical effluents using LEVAPOR-carrier

    Mixed effluents of chemical productions are comprising mainly of Mixtures of several type, often also inhibitory pollutants, respectively salinities characterised by fluctuating concentrations and qualities, resulting often in low rates and stabilities of nitrication processes, despite to efficient COD removals. Immobilisation of nitrifying biomass results generally in process ...

  • The expanded Bed Biofilm reactor (EBBR) – an innovative Biofilm approach for tertiary nitrification

    ABSTRACT The expanded bed biofilm reactor (EBBR) was developed by Advanced Bioprocess Development Ltd. (ABD) to provide a compact tertiary nitrification process. In terms of performance, the EBBR can meet an NH3-N discharge of less than 1 mg/L at high volumetric loading rates (1.0 kg NH3-N/m3 expanded bed /day). This high rate results from a predominance of nitrifying bacteria immobilized as ...

  • IFAS Media in a Sequencing Batch Reactor for Nitrification and Denitrification of High Strength Wastewater

    In 1996 a study group identified pig farm waste as one of Asia’s foremost environmental problems. So in 1999 a US AEP led effort established the Environmental Center for Livestock Waste Management (ECLWM) on the campus of the National Pingtung University of Science and Technology (NPUST), Taiwan. The ECLWM constructed a state-of-the-art prototype swine manure wastewater treatment system. A ...

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