GWWI WEF Wastewater Treatment Fundamentals Practice Test 2025 – Your Comprehensive All-in-One Guide to Exam Success!

A thermophilic environment is characterized by high temperatures, typically in the range of 45°C to 80°C (113°F to 176°F), and the presence of moisture. Thermophiles are microorganisms that thrive in these hot environments, often found in places like hot springs, compost piles, and certain industrial processes involving heat. The combination of heat and moisture encourages the growth of these specialized organisms, which can metabolize organic materials and play a role in various biological processes, such as the breakdown of waste.

In contrast, cool and moist conditions are more suitable for mesophilic organisms, while warm and dry or cold and dry environments are not conducive to the thriving of thermophiles. These other conditions either lack the necessary heat or moisture critical for thermophilic activity. Thus, the defining features of a thermophilic environment clearly align with the characteristics of being hot and moist, making this the correct choice.