Distribution of free-living amoebae in a treatment system of textile industrial wastewater
Por:
Ramirez, E, Robles, E, Martinez, B, Ayala, R, Sainz, G, Martinez, ME, Gonzalez, ME
Publicada:
1 nov 2014
Resumen:
Free-living amoebae have been found in soil, air and a variety of
aquatic environments, but few studies have been conducted on industrial
wastewater and none on wastewater from the textile industry. The aim of
this study was to determine the presence and distribution of free-living
amoebae in a biological treatment system that treats textile industrial
wastewater. Samples were taken from input, aeration tank, sedimentation
tank and output. Samples were centrifuged at 1200g for 15 min, the
sediment was seeded on non-nutritive agar with Enterobacter aerogenes
(NNE) and the plates were incubated at 30 and 37 degrees C. Free-living
amoebae were present in all stages of the treatment system. The highest
number of amoebic isolates was found in the aeration tank and no
seasonal distribution was observed during the year. A total of 14 amoeba
genera were isolated: Acanthamoeba, Echinamoeba, Korotnevella,
Mayorella, Naegleria, Platyamoeba, Saccamoeba, Stachyamoeba, Thecamoeba,
Vahlkampfia, Vannella, Vermamoeba, Vexillifera and Willaertia. The most
frequently found amoebae were Acanthamoeba and Vermamoeba which were
found in all treatment system stages. The constant presence and
diversity of free-living amoebae in the treatment system were important
findings due to the characteristics of the wastewater from the textile
plant in terms of the residue content from colorants, fixers, carriers,
surfactants, etc., used in fabric dyeing and finishing processes. The
factors that determined the presence and distribution of amoebae in the
activated sludge system were their capacity to form cysts, which allowed
them to resist adverse conditions; food availability; an average
temperature of 27-33 degrees C; dissolved oxygen in average
concentrations above 2 mg/L, and pH in a range of 5.9-7.1. (C) 2014
Elsevier Inc. All rights reserved.
Filiaciones:
Ramirez, E:
Univ Nacl Autonoma Mexico, FES Iztacala, Environm Conservat & Improvement Project, Mexico City, DF, Mexico
Robles, E:
Univ Nacl Autonoma Mexico, FES Iztacala, Environm Conservat & Improvement Project, Mexico City, DF, Mexico
Martinez, B:
Univ Nacl Autonoma Mexico, FES Iztacala, Environm Conservat & Improvement Project, Mexico City, DF, Mexico
Ayala, R:
Univ Nacl Autonoma Mexico, FES Iztacala, Environm Conservat & Improvement Project, Mexico City, DF, Mexico
Sainz, G:
Univ Nacl Autonoma Mexico, FES Iztacala, Environm Conservat & Improvement Project, Mexico City, DF, Mexico
Martinez, ME:
Univ Nacl Autonoma Mexico, FES Iztacala, Environm Conservat & Improvement Project, Mexico City, DF, Mexico
Gonzalez, ME:
Univ Nacl Autonoma Mexico, FES Iztacala, Environm Conservat & Improvement Project, Mexico City, DF, Mexico
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