According to Massachusetts regulations, what is the maximum temperature allowed to avoid inhibiting biological activity in treatment facilities?

The maximum temperature allowed to avoid inhibiting biological activity in treatment facilities, according to Massachusetts regulations, is set at 40 degrees Celsius (104 degrees Fahrenheit). Maintaining this temperature is crucial because biological processes, particularly those involving microorganisms that break down pollutants in wastewater, are sensitive to temperature fluctuations.

When temperatures exceed this threshold, the efficiency of these biological processes can decline significantly. Higher temperatures may lead to increased metabolic rates initially, but can soon cause stress or kill off essential microorganisms, disrupting the balance needed for effective treatment. By adhering to the 40-degree Celsius guideline, facilities ensure that the biological community remains healthy and active, thereby optimizing the wastewater treatment process.

In contrast, temperatures above this limit—such as those indicated by the other options—could compromise the viability of the biological treatment processes, potentially leading to insufficient treatment and non-compliance with environmental regulations.