@misc{SteffenLeuschnerMuelleretal., author = {Steffen, Kristina and Leuschner, Christoph and M{\"u}ller, Uta and Wiegleb, Gerhard and Becker, Thomas}, title = {Relationships between macrophyte vegetation and physical and chemical conditions in northwest German running waters}, series = {Aquatic Botany}, journal = {Aquatic Botany}, number = {113}, issn = {0304-3770}, pages = {46 -- 55}, language = {en} } @misc{EngelbrechtFondengcapMartienssenetal., author = {Engelbrecht, Steffen and Fondengcap, Mbengamina Terence and Martienssen, Marion and Rathsack, Kristina}, title = {Highly efficient long-term storage of carrier-bound anammox biomass}, series = {Water Science \& Technology}, volume = {74}, journal = {Water Science \& Technology}, number = {8}, issn = {0273-1223}, doi = {10.2166/wst.2016.364}, pages = {1911 -- 1918}, abstract = {The anammox process is a potential alternative to the conventional nitrogen removal from wastewater. However, due to large generation times of anammox bacteria, the start-up of treatment reactors may be impeded. An efficient storage technique can handle this drawback and may be also suitable for seasonally operated treatment plants like in touristic areas. In the current study, several storage techniques were investigated with respect to its suitability for the preservation of the specific anammox activity after long-term storage. Storing conditions differed in terms of temperature, redox buffer and nutrient supplementation. The specific activity of immobilized anammox bacteria (Candidatus Kuenenia stuttgartiensis) was determined three times during a long-term preservation of 78 days and 106 days, respectively. The highest activity was ensured at a storing temperature of 4 WC, providing nitrate as redox buffer and a nutrient supplement every 23 days. Thus, 91.4\% of the initial anammox activity could be preserved after a storage of 106 days. Superiority of the presented treatment condition was confirmed by a calculated nitrate-ammonium consumption rate close to the optimal ratio of 1.32. This technique provided an economical and simple method suitable for long-term storage of immobilized anammox biomass.}, language = {en} } @misc{EngelbrechtMozooniRathsacketal., author = {Engelbrecht, Steffen and Mozooni, Mohammad and Rathsack, Kristina and B{\"o}llmann, J{\"o}rg and Martienssen, Marion}, title = {Effect of increasing salinity to adapted and non-adapted Anammox biofilms}, series = {Environmental Technology}, volume = {40}, journal = {Environmental Technology}, number = {22}, issn = {0959-3330}, doi = {10.1080/09593330.2018.1455748}, pages = {2880 -- 2888}, abstract = {The Anammox process is an efficient low energy alternative for the elimination of nitrogen from wastewater. The process is already in use for side stream applications. However, some industrial wastewaters, e.g. from textile industry are highly saline. This may be a limit for the application of the Anammox process. The aim of this study was to evaluate the effects of different NaCl concentrations on the efficiency of adapted and non-adapted Anammox biofilms. The tested NaCl concentrations ranged from 0 to 50 g NaCl*L⁻¹. Concentrations below 30 g NaCl*L⁻¹did not significantly result in different nitrogen removal rates between adapted and non-adapted bacteria. However, adapted bacteria were significantly more resilient to salt at higher concentrations (40 and 50g NaCl*L⁻¹). The IC50 for adapted and non-adapted Anammox bacteria were 19.99 and 20.30 g NaCl*L⁻¹, respectively. Whereas adapted biomass depletes the nitrogen in ratios of NO-₂/NH+₄ around 1.20 indicating a mainly Anammox-driven consumption of the nitrogen, the ratio increases to 2.21 at 40 g NaCl*L⁻¹ for non-adapted biomass. This indicates an increase of other processes like denitrification. At lower NaCL concentrations up to 10 g NaCl*L⁻¹, a stimulating effect of NaCl to the Anammox process has been observed.}, language = {en} }