Abstract
Although activated sludge microbial communities are considered stable, the presence of toxic substances, such as Cr, in the influent may induce changes in the activity and the performance of a wastewater treatment plant. The main objective of this study was the determination of Cr effects on the performance and the protistan community of an activated sludge. Six laboratory scale activated sludge reactors, three conventional and three with PVA gel beads, were supplied with synthetic sewage containing Cr (VI), at three concentrations: 1, 5, and 10 mg l−1. The protozoan species were identified, quantified, and correlated to each system's efficiency through microscopic observations. Additionally, the extracellular polymeric substances (EPS) in the form of proteins and polysaccharides were determined. High removal rates of organic compounds (90%), ammonia-nitrogen (95%), total phosphorus (80%), and chromium (90%) were observed even at high Cr dosages. ?he abundance and diversity of the protistans were observed...
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