nitrification Articles

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Understanding the contribution of biofilm in an integrated fixed-film-activated sludge system (IFAS) designed for nitrogen removal

by IWA Publishing  (May 18, 2015)

The objective of this study is to improve knowledge on the integrated fixed-film-activated sludge (IFAS) system designed for nitrogen removal. Biofilm growth and its contribution to nitrification were monitored under various operating conditions in a semi-industrial pilot-scale plant. Nitrification rates were observed in biofilms developed on ...

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 ...

BM respirometry study about nitrification inhibition and actual aeration capacity in an activated sludge process case study

by SURCIS, S.L.  (Nov. 19, 2014)

Study for municipal WWTP in Spain This study is ordered to SURCIS as a consequence of the low process performance, practical absence of nitrification treatment. By other side, the mixed-liquor presented some abnormal features such as weakness, dark colour and abundant white foaming. Data for study interest Aeration system: fine ...

Respirometry study of two different wastewater samples on COD fractioning & biodegradability for a specific activated sludge process and nitrification case study

by SURCIS, S.L.  (Nov. 19, 2014)

Preliminary This service was made according to customer order points and indications from Hydrolab Microbiológica (Surcis collaborator) The client wanted Surcis to carry out a study about COD fractioning and nitrification. For this study the client has provided to Surcis the following: Process type: Activated sludge - Extended aeration ...

Simultaneous autotrophic denitrification and nitrification in a low-oxygen reaction environment

by IWA Publishing  (Aug. 13, 2014)

The occurrence of autotrophic denitrification and nitrification activities by ammonia-oxidising bacteria and nitrite-oxidising bacteria is studied in a bioreactor system operable at low-dissolved oxygen (DO) and at variable oxygen influx rates. At a loading of 3.6 mg NH4+–N/h into the bioreactor, simultaneous autotrophic ...

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 ...

Silver nanoparticles temporarily retard NO2‐ production without significantly affecting N2O release by Nitrosomonas europaea

by John Wiley & Sons, Ltd.  (May 24, 2015)

Nitrifying bacteria are highly susceptible to silver nanoparticles (AgNPs). Yet, the effect of sub‐lethal exposure to AgNPs on their release of nitrogenous compounds of environmental concern (e.g., the greenhouse gas nitrous oxide (N2O) and the common water pollutant nitrite (NO2‐)) has not been systematically investigated. Herein, we report ...

A kinetic study of nitrification inhibition in water distribution systems using low levels of chlorite

by IWA Publishing  (Sep. 8, 2014)

Water utilities use operational strategies such as increasing pH, chlorine-ammonia ratio, and/or chloramine residual, distribution main flushing, and periodic break-point chlorination to control nitrification of chloraminated water in distribution systems. Although these methods are proven to be useful in controlling nitrification, the results ...

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 ...

Aerobic granular sludge technology and nitrogen removal for domestic wastewater treatment

by IWA Publishing  (Apr. 13, 2015)

This study evaluated aerobic granulation and nitrogen removal via assimilation, nitrification, and denitrification of a system fed with real domestic wastewater. The granulation process was complete after 160 days of operation. The mature granules had an almost spherical structure, an average size of 473.0 μm, and a good settling ability ...

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