Toxicity of Ammonia Nitrogen to Ciliated Protozoa Stentor coeruleus and Coleps hirtus Isolated from Activated Sludge of Wastewater Treatment Plants

We assessed the toxicity of ammonia ions to Stentor coeruleus and Coleps hirtus (Protozoa) isolated from activated sludge taken from two municipal wastewater treatment plants in southern Poland. Stentor coeruleus is a rarely occurring species in activated sludge, unlike the widespread Coleps hirtus....

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Detalles Bibliográficos
Autores principales: Klimek, Beata, Fyda, Janusz, Pajdak-Stós, Agnieszka, Kocerba, Wioleta, Fiałkowska, Edyta, Sobczyk, Mateusz
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Springer-Verlag 2012
Materias:
Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3464382/
https://www.ncbi.nlm.nih.gov/pubmed/22976439
http://dx.doi.org/10.1007/s00128-012-0816-3
Descripción
Sumario:We assessed the toxicity of ammonia ions to Stentor coeruleus and Coleps hirtus (Protozoa) isolated from activated sludge taken from two municipal wastewater treatment plants in southern Poland. Stentor coeruleus is a rarely occurring species in activated sludge, unlike the widespread Coleps hirtus. The mean LC50 values (concentration causing 50 % mortality) calculated for the 24 h tests differed hugely between the tested species: 43.03 mg NH(4+) dm(−3) for Stentor coeruleus and 441.12 mg NH(4+) dm(−3) for Coleps hirtus. The ammonia ion concentration apparently is an important factor in the occurrence of these protozoan species in activated sludge.

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