Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Nitrification in a Model Distribution System Fed with Reclaimed Water from a Wastewater Treatment Plant
This study characterized the nitrification in a reclaimed water distribution system (DS) and the population size of ammonium‐oxidizing bacteria (AOB) and nitrite‐oxidizing bacteria (NOB) distributed along the flow course by a series of mixed reactors. The series reactors were initially adopted to study the DS of the reclaimed water and can be used as a feasible method for a similar investigation. This method was easy to model, control, and sample the biofilm formed in the DS. The series reactors were assembled in the Qingyuan Wastewater Treatment and Reuse Company of Xi'an, where the finished water was drawn directly. A mean of 85.0% NH4+‐N removal was obtained during a continuous operation of 239 days, when the influent concentration of NH4+‐N was 5.21 mg/L on average. The measurement of inorganic nitrogen and nitrification rate along the flow course indicated high activities of the nitrifiers that mainly existed at the initial segment of DS, whereas the pH value and dissolved oxygen concentration decreased. The analysis of the fluorescence in situ hybridization exhibited that the population of the nitrifiers was the highest (an average of 14.33–41.75%) of all bacteria in the biofilm. The dominating species of AOB were Nitrosospira, which presented an increasing trend along the DS course. The dominant shift of NOB, from Nitrobacter to Nitrospira, along the DS may be attributed to the variance of the nutrient condition. This shift confirmed the K/r hypothesis.
Nitrification in a Model Distribution System Fed with Reclaimed Water from a Wastewater Treatment Plant
This study characterized the nitrification in a reclaimed water distribution system (DS) and the population size of ammonium‐oxidizing bacteria (AOB) and nitrite‐oxidizing bacteria (NOB) distributed along the flow course by a series of mixed reactors. The series reactors were initially adopted to study the DS of the reclaimed water and can be used as a feasible method for a similar investigation. This method was easy to model, control, and sample the biofilm formed in the DS. The series reactors were assembled in the Qingyuan Wastewater Treatment and Reuse Company of Xi'an, where the finished water was drawn directly. A mean of 85.0% NH4+‐N removal was obtained during a continuous operation of 239 days, when the influent concentration of NH4+‐N was 5.21 mg/L on average. The measurement of inorganic nitrogen and nitrification rate along the flow course indicated high activities of the nitrifiers that mainly existed at the initial segment of DS, whereas the pH value and dissolved oxygen concentration decreased. The analysis of the fluorescence in situ hybridization exhibited that the population of the nitrifiers was the highest (an average of 14.33–41.75%) of all bacteria in the biofilm. The dominating species of AOB were Nitrosospira, which presented an increasing trend along the DS course. The dominant shift of NOB, from Nitrobacter to Nitrospira, along the DS may be attributed to the variance of the nutrient condition. This shift confirmed the K/r hypothesis.
Nitrification in a Model Distribution System Fed with Reclaimed Water from a Wastewater Treatment Plant
Wang, Yi (Autor:in) / Ke, Li (Autor:in) / Pei, Li‐Ying (Autor:in) / Fan, Li‐Yan (Autor:in) / Nan, Ya‐Ping (Autor:in) / Peng, Dang‐Cong (Autor:in) / Xia, Si‐Qing (Autor:in)
CLEAN – Soil, Air, Water ; 44 ; 263-271
01.03.2016
10 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Water resources , Biofilm , FISH , Bacteria
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