Abstract
Non-ionic surfactants (NS) are a major source of synthetic organic carbon discharged into surface water. The aim of this work was the investigation of the influence of different factors on NS removal in an activated sludge sewage treatment plant (STP). Tensammetric analytical tools were used for fast and inexpensive NS determination. The STP in Blonie (Poland) was the subject of research. The STP's reconstruction caused a spectacular lowering of NS concentration in the treated sewage; however, in subsequent years, NS concentration significantly rose, due to a dramatic increase in the NS load. The NS load reduction in the reconstructed STP was relatively high (93.4–97.9%). The presence of exclusively alcohol ethoxylates was confirmed in the raw sewage. The residual NS concentration in treated sewage is dependent on the hydraulic retention time, the NS load and on the sludge volume index.
Kurzfassung
Nichtionische Tenside (NS) sind die Hauptquelle von synthetischem organischen Kohlenstoff, der in das Oberflächengewässer gelangt. Ziel dieser Arbeit war, den Einfluss verschiedener Faktoren auf die Entfernung von NS in einer Belebtschammkläranlage zu untersuchen (STP). Analytische tensametrische Methoden wurden für die schnelle und preiswerte NS-Bestimmung eingesetzt. Die Kläranlage in Blonie (Polen) war der Ort der Untersuchung. Der Umbau der STP bewirkte eine eindrucksvolle Verringerung der NS-Konzentration im geklärten Abwasser. In den folgenden Jahren jedoch stieg die NS-Konzentration aufgrund der dramatischen Zunahme der NS-Beladung signifikant an. Die Reduktion der NS-Beladung in der umgebauten STP war relativ hoch (93.4–97.9%). Die Anwesenheit von ausschließlich Alkoholethoxilaten im unbehandelten Abwasser wurde bestätigt. Die übrig bleibende NS-Konzentration im behandelten Abwasser hängt von der hydraulischen Retentionszeit, der NS-Beladung und dem Abwasservolumenindex ab.
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