Denitrification and Pesticide Elimination in Drinking Water Treatment with the Biodegradable Polymer Poly(ϵ‐caprolactone) (PCL)

Abstract

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.

Denitrification of nitrate-contaminated groundwater using biodegradable snack ware as carbon source under low-temperature condition

“…The disadvantage of this treatment process is the need of a close, rather sophisticated process control, and has the risk of overdosing with the resultant deterioration of effluent water quality (Boley et al 2000). To avoid above-mentioned problems, insoluble substrates (solid carbon sources) including wheat straw, cotton, polycaprolactone (PCL) and polyhydroxyalkanoates (PHAs) as an alternative to the liquid carbon sources have been successfully employed in denitrification process by some researchers in recent years (Soares and Abeliovich 1998;Boley et al 2003;Hiraishi and Khan 2003;Wang and Wang 2009). Solid substrates used in the denitrification process serve as both constant sources of reducing power for denitrification and matrices favorable for development of microbial films (Hiraishi and Khan 2003).…”

Activity and Community Composition of Denitrifying Bacteria in Poly(3-hydroxybutyrate-co-3-hydroxyvalerate)-Using Solid-phase Denitrification Processes

“…To date, SPD processes using poly(3-hydroxybutyrate) (PHB) 31) and its copolymer, poly(3-hydroxybutyrate-co-hydroxyvalarate) (PHBV) 6,26,30) , have been most intensively studied. The application of poly(ε-caprolactone) (PCL) to SPD processes has also been reported [4][5][6]22) .…”

Thermomonas fusca sp. nov. and Thermomonas brevis sp. nov., two mesophilic species isolated from a denitrification reactor with poly( -caprolactone) plastic granules as fixed bed, and emended description of the genus Thermomonas

“…In a parallel experiment, a reactor with poly(ecaprolactone) with a similar set-up was investigated and large numbers of bacteria were isolated from the biofilm on the granules and characterized by fatty acid analysis (Boley et al, 2003). While most organisms were identified as Acidovorax spp., a group of 22 strains with similar fatty acid profiles remained unidentified; representative strains of this group were found to be phylogenetically related to Thermomonas haemolytica (type species) and Thermomonas hydrothermalis, two recently described, slightly thermophilic species isolated from kaolin slurry (Busse et al, 2002) and a hot spring (Alves et al, 2003), respectively.…”