nitrification Articles

  • Nitrification Insurance

    A market leader in biomass engineering has launched a 24-hour biological safeguard system to protect organisations operating treatment plants against discharging illegal levels of ammonia. North East-based Cleveland Biotech (CB) has seen an increase in enquiries for its Amnite NS5000 product from companies which are obliged to prove to authorities they adhere to legal constraints over their ...


    By Cleveland Biotech Ltd.

  • 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.

  • Nitrification case study

    The Bay View effluent treatment plant is one of the largest wastewater treatment facilities in North West Ohio, USA. The facility is located near the mouth of the Maumee River and provides treatment for an area of about 100 square miles. About 84 square miles of this area is located within Toledo city. The population that it serves is approximately 398,000. The plant operates on a 24 hour a day, ...


    By Cleveland Biotech Ltd.

  • 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.

  • Nitrification of high salinity chemical effluents

    1. The problem While during the biotreatment of non inhibitory chemical effluents containing 30 to 60 g/L salt the main part of organic pollutants (TOC, COD) do become degraded, is the nitrification of the present NH4N by suspended biomass because of high osmotic pressure in the reactor not possible. 2. The solution Lab scale tests have shown, that nitrification ...

  • 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 ...

  • Post Lagoon Nitrification in Cold Climates

    A Submerged Attached Growth Reactor (SAGR) Demonstration Site has been in operation following a primary aerated lagoon in Steinbach, MB since August 2007. This system provides nitrification, with influent winter water temperatures (post lagoon) below 0.5 degrees Celsius. The performance objective of the system was to achieve effluent cBOD5 and TSS levels of less than 10 mg/L, and ammonia of less ...


    By Nelson Environmental Inc.

  • Nitrogen balance and transformation in the nitrification process of coking wastewater and the influence on nitrification kinetics

    This paper describes the total nitrogen balance, and the direction and degree of nitrogen transformation during the nitrification process of coking wastewater. According to the actual nitrification process, the conventional nitrification kinetic equation was amended. After 48 h of nitrification, the total nitrogen content remained almost the same with error less than 0.6%. The total ...


    By IWA Publishing

  • Nitrification in Monochloramine-Treated Water Systems

    A Water utility based int the Midwest USA uses Monochloramine treatment to treat their two surface water treatment plants to disinfect raw water and establish residual disinfectant prior to discharge to their distribution system.  Like most water utilities that use Monocholoramines, a common area of concern is nitrification. Residual ammonia from chloramines can serve as a food source for ...


    By LuminUltra Technologies Ltd.

  • Industrial Wastewater: Nitrification Inhibition Tests

    Is the biology in your sewage plant working properly? During aerobic and anaerobic decomposition reactions nitrogen from nitrogen-containing organic substances is first converted to ammonium.   The subsequent two-step microbial oxidation of ammonia to nitrate via nitrite is called nitrification. In soil as well as in water it is performed by nitrifying bacteria, a fact which is ...

  • 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 ...

  • 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

  • Recovery of Nitrification pharmaceutical company case study

    One Sunday in May our weekend standby service received a telephone call from a pharmaceutical company who’s waste water treatment system had suffered a plant upset, thought to have occurred the previous day, resulting in the loss of nitrification. The standard to be maintained is 10 mg/l. Because of the urgency of the situation our team traveled to the company that same day taking ...


    By Bio Systems Europe

  • Factors influencing nitrification in point-of-use BioSand filters

    The BioSand filter (BSF) is a point-of-use treatment technology used in developing countries to improve drinking water quality. Studies on the BSF to date have mainly focused on bacterial, protozoan and virus reduction and less on the filter's effect on chemical contaminants that may also affect human health. This study explored the potential for nitrification in field-scale trials of ...


    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 ...

  • 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

  • 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

  • Nitrification toxicity evaluation using bench-scale testing

    The Camas Wastewater Treatment Facility experienced a prolonged period of poor ammonia removal (nitrification). A variety of “real-world” bench tests were developed and performed to determine if toxins were inhibiting the nitrification process. The focus of this paper is on the methodology used and conclusions drawn from the bench-testing. INTRODUCTIONTest were performed that compared ...

  • 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 ...

  • 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 ...

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