nitrification Articles

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Nitrification case study

by Cleveland Biotech Ltd  (May 29, 2014)

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 ...

N2O emission in short-cut simultaneous nitrification and denitrification process: dynamic emission characteristics and succession of ammonia-oxidizing bacteria

by IWA Publishing  (Jun. 25, 2014)

A sequencing batch airlift reactor was used to investigate the characteristics of nitrous oxide (N2O) emission and the succession of an ammonia-oxidizing bacteria (AOB) community. The bioreactor could successfully switch from the complete simultaneous nitrification and denitrification (SND) process to the short-cut SND process by increasing the ...

Influence of shear on nitrification rates in a membrane bioreactor

by IWA Publishing  (Apr. 24, 2014)

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 ...

Tracking composition of microbial communities for simultaneous nitrification and denitrification in polyurethane foam

by IWA Publishing  (May 7, 2014)

The process of simultaneous nitrification and denitrification (SND) of immobilized microorganisms in polyurethane form is discussed. The effect of different positions within the polyurethane carrier on microbial community response for the SND process is investigated by a combination of denaturing gradient gel electrophoresis profiles of the 16S ...

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

by IWA Publishing  (Apr. 10, 2014)

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 ...

The effect of soil properties on the toxicity of silver to the soil nitrification process

by John Wiley & Sons, Ltd.  (Feb. 1, 2014)

Silver (Ag) is being increasingly used in a range of consumer products, predominately as an antimicrobial agent, leading to a higher likelihood of its release into the environment. This study investigated the toxicity of Ag to the soil nitrification process in a European and Australian soils in both leached and unleached conditions. Overall, ...

Successful startup of a full-scale acrylonitrile wastewater biological treatment plant (ACN-WWTP) by eliminating the inhibitory effects of toxic compounds on nitrification

by IWA Publishing  (Feb. 19, 2014)

During the startup of a full-scale anoxic/aerobic (A/O) biological treatment plant for acrylonitrile wastewater, the removal efficiencies of NH3-N and total Kjeldahl nitrogen (TKN) were 1.29 and 0.83% on day 30, respectively. The nitrification process was almost totally inhibited, which was mainly caused by the inhibitory effects of toxic ...

Recovery of Nitrification pharmaceutical company case study

by Bio Systems Europe  (Aug. 9, 2013)

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 ...

Ecotoxicity of benzo[a]pyrene assessed by soil microbial indicators

by John Wiley & Sons, Ltd.  (Jul. 9, 2014)

The ecotoxicity of benzo[a]pyrene (BaP) to soil microorganisms was evaluated using the following microbial indicators: soil microbial biomass, respiration, nitrification, and Shannon index. Two soil types, udic ferrosols and aquic cambisols, were amended with 0 mg/kg, 1 mg/kg, 10 mg/kg, 100 mg/kg, 500 mg/kg, or 1000 mg/kg BaP; incubated at ...

Factors influencing nitrification in point-of-use BioSand filters

by IWA Publishing  (Aug. 29, 2013)

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 ...

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