nitrification Articles

  • The Use of Water Quality and Process Models for Minimizing Wastewater Utility Greenhouse Gas Footprints

    The Use of Water Quality and Process Models for Minimizing Wastewater Utility Greenhouse Gas Footprints provides an understanding of the processes that are responsible for the major contributions to GHG emissions from WWTP and sewer systems (e.g. heterotrophic denitrification, autotrophic nitrification, autotrophic denitrification, methanogenesis). This knowledge is translated into mathematical ...


    By IWA Publishing

  • CHIP-tuning for biological wastewater treatment plants

    The demand for efficiency improvement in municipal and industrial wastewater treatment plants (WWTP’s) is increasingly based on problems related to the water quality, process stability and/or insufficient performance in the COD removal and/or nitrification process. New, stricter requirements or the need for higher removal efficiency intensify the demand for optimizing the existing ...


    By Multi Umwelttechnologie AG

  • ENHANCING THE PERFORMANCE OF OXIDATION DITCHES

    Oxidation ditches are very popular wastewater treatment processes for small to mediumsized municipalities that have to meet stringent water quality standards. Oxidation ditches provide cost-effective treatment while requiring relatively simple operational skills. Because carbonaceous BOD removal, nitrification, and de-nitrification can be accomplished within a single reactor, the process can ...


    By S&N Airoflo Inc.

  • 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 ...


    By IWA Publishing

  • N-Tox® prevents activated sludge failure and monitors greenhouse gas emissions

    A new technique for evaluating nitrification efficiency in industrial and municipal activated sludge systems is described that uses direct measurement of dinitrogen oxide, an important greenhouse gas, as an indicator of nitrification failure. Developed at Water Innovate, N-Tox® helps control ammonia levels in treated effluent by providing an early warning of wastewater treatment failure. The ...


    By Clarity Authoring

  • 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.

  • Municipal WWTP, Spain: A Case Study

    Overview The oxidation ditch configuration based wastewater treatment plant in Spain required a quick upgrade in order to comply with new inflow and quality requirements. Requirements The existing plant was operating with two parallel Oxidation Ditch modules with a flow rate of 600 m³/d each, and exhibited very poor nitrification capacity. The plant was to be ...

  • The kinetics for ammonium and nitrite oxidation under the effect of hydroxylamine

    The kinetics for ammonium (NH4+) oxidation and nitrite (NO2−) oxidation under the effect of hydroxylamine (NH2OH) were studied by respirometry using the nitrifying sludge from a laboratory-scale sequencing batch reactor. Modified models were used to estimate kinetics parameters of ammonia and nitrite oxidation under the effect of hydroxylamine. An ...


    By IWA Publishing

  • Nitrifying Bacteria - Koi Carp Ammonia Removal

    A range of nitrifying bacteria - Nitrosomonas (NS) and Nitrobacter (NB). NS converts Ammonia to Nitrite, NB converts Nitrite to Nitrate. Features: Fermented in-house by CBIO Available in a range of activity levels from 100 to 5000 mg/N/lt/hr Very short shelf-life, therefore fresh stocks always available Can be shipped world-wide at short notice ...


    By Cleveland Biotech Ltd.

  • The characteristics of immobilized granular sludge in the laboratory-scale stable partial nitrification-Anammox aquaculture water reactors

    Immobilized granular sludge is of key importance for highly effective operation of partial nitrification and anaerobic ammonium oxidation (PN-Anammox) reactors. An observation and analysis on the composition of immobilized granular sludge in each reactor was conducted by using scanning electron microscopy (SEM) and fluorescence in situ hybridization. It was indicated that the diversity of ...


    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

  • Biofiltration WWTP 50.000 PE

    The aerated upflow biological filtration (biofiltration) is a technology which is today successfully used in more than 500 European wastewater treatment plants. Among this, the one of Sallek Valley, in Slovenia, differs by a two stage biofiltration and a part-recirculation of sludge from thickener to increase the COD concentration needed for denitrification. This process allows an advanced ...


    By AquaBiotec

  • Assessment of nitrogen and phosphorus removal in an intermittently aerated sequencing batch reactor (IASBR) and a sequencing batch reactor (SBR)

    Biological nitrogen and phosphorus removal was investigated in an intermittently aerated sequencing batch reactor (IASBR) and a sequencing batch reactor (SBR). The removal efficiencies of ammonium-nitrogen (NH4+-N) were 100% in both reactors in steady operation state. The total nitrogen (TN) removal efficiencies were 90.4% in the IASBR and 79.3% in the SBR, ...


    By IWA Publishing

  • Influence of organic loading on nitrogen removal in a partially aerated submerged filter

    Influence of organic loading on simultaneous removal of organic carbon and nitrogen was investigated in a partially aerated submerged filter. This study indicates that high removal rates of organic carbon and nitrogen can be achieved in a single reactor. Organic loading had significant influence on nitrogen removal. Increase in COD loading promoted microanoxic conditions established within ...


    By Inderscience Publishers

  • 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 ...


    By IWA Publishing

  • 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

  • Inhibitory effect of thiourea on biological nitrification process and its eliminating method

    Thiourea is a typical nitrification inhibitor that shows a strong inhibitory effect against the biological nitrification process. The 50% inhibitory concentration (IC50) of thiourea on nitrification was determined to be 0.088 mg g VSS−1, and nitrifiers recovered from the thiourea inhibition after it was completely degraded. The thiourea-degrading ability of the sludge system was improved ...


    By IWA Publishing

  • The ORP and pH profiles during simultaneous nitrification and denitrification of low carbon municipal wastewater

    The ORP and pH profiles and the stability of Simultaneous Nitrification and Denitrification (SND) for low carbon municipal wastewater treatment were investigated under the different aeration modes in Sequencing Batch Reactor (SBR). The results showed that the 92% removal efficiency for TN, the smallest average level of ORP and both of the variation of ORP and pH values are achieved in ...


    By Inderscience Publishers

  • Synthetic dairy wash-water treatment by using an alternating pumped sequencing batch biofilm reactor

    The performance of an alternating pumped sequencing batch biofilm reactor process in synthetic diary wash-water treatment was studied. The system comprises two reactors with two identical plastic biofilm modules. Two centrifugal pumps, one connected to each reactor, alternately move the water from one reactor to the other one, resulting in aeration. At three loading rates (336, 501 and 1080 g ...


    By Inderscience Publishers

  • 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

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