A combination of denitrification and pesticide sorption with the biodegradable polymer poly(-caprolactone) (PCL) was examined. The function of PCL is to act as carbon source and carrier for the bacteria and simultaneously as sorbent for the pesticide endosulfan. In a short-term examination (1 month) the addition of the pesticide endosulfan to a continuous-flow fixed-bed reactor resulted in an inhibition of biomass production without reduction of the denitrification performance. However in a long-term semi-batch reactor test (6 months) biomass production and partly denitrification rates were affected. No significant differences in microbial composition between the reactors were observed. Regardless of the type of reactor or presence of endosulfan, Acidovorax facilis was the main constituent.
Denitrifikation und Pestizidelimination im Trinkwasser mit dem biologisch abbaubaren Polymer Poly(-caprolacton) (PCL)Es wurde eine Kombination aus Denitrifikation und Pestizidelimination mit dem bioabbaubaren Polymer Poly(-caprolacton) (PCL) untersucht. PCL dient dabei als Kohlenstoffquelle und Trägermaterial für die Bakterien und gleichzeitig als Sorbens für das Pestizid Endosulfan. Bei einem Kurzzeittest (1 Monat) wurde bei Zudosierung des Pestizids Endosulfan zu einem kontinuierlich betriebenen Festbettreaktor eine Hemmung der Biomasseproduktion festgestellt, ohne dass die Denitrifikationsleistung vermindert war. In einem Langzeit-Semi-BatchReaktor-Test (6 Monate) wurden dagegen die Biomasseproduktion und teilweise auch die Denitrifikationsgeschwindigkeit beeinträchtigt. Dabei wurden zwischen den beiden Reaktoren keine signifikanten Unterschiede der mikrobiellen Zusammensetzung gefunden. Unabhängig vom Reaktortyp oder der Anwesenheit von Endosulfan war Acidovorax facilis der dominante Stamm.
A denitrification system based on the biodegradable polymer Poly-epsilon-Caprolactone (PCL) was tested in a laboratory-scale recirculated aquaculture system with eels in comparison to a reference system without denitrification. The experiments were conducted with fluidized bed reactors in two parallel systems to examine the feasibility and performance of the process and to observe the condition of fishes by measuring weight gain during the test-period. The most evident effect of the system with denitrification was the low nitrate concentration compared with the untreated reference system. A further advantage was the stability of the pH in the systems with denitrification whereas pH of the untreated water decreased due to nitrification. All over the test-period the eels showed a similar weight gain in both systems.
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