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Which filament is indicative of a low dissolved oxygen (DO) concentration?

  1. M. Parvicella

  2. S. natans

  3. H. Hydros

  4. F. limosus

The correct answer is: H. Hydros

The filament indicative of low dissolved oxygen (DO) concentration is H. Hydros. This is due to its growth behavior in environments where oxygen levels are limited. In aquatic systems, low DO concentrations often foster the growth of certain types of filamentous bacteria, including H. Hydros, making its presence a reliable indicator of poor oxygen conditions. H. Hydros tends to thrive in conditions where organic matter and nutrient levels are high while oxygen levels are low. As these bacteria proliferate, they can contribute to various complications in wastewater treatment processes, such as the formation of sludges that can hinder the treatment efficiency and lead to odor issues. In contrast, other filaments mentioned typically either do not exhibit a strong correlation with low DO or may thrive in conditions where oxygen levels are adequate. Understanding these relationships is crucial for wastewater operators in monitoring and managing treatment systems effectively.