Texas Class C Wastewater Treatment License Practice Exam

Pressure relief and vacuum relief valves are essential components of anaerobic digester roofs primarily to prevent explosive decompression. In anaerobic digestion, the breakdown of organic matter produces biogas, which can create significant pressure within the digester. If this pressure is not controlled, it may lead to an explosive situation due to the rapid release of built-up gases.

By incorporating pressure relief valves, the system can safely vent excess pressure, ensuring that the pressure within the digester remains within safe limits. Similarly, vacuum relief valves are crucial for preventing negative pressure situations when the digester is being drained or if the gas is being utilized, which can also cause structural issues or unleashing dangerous gas build-up.

Therefore, the role of these valves in maintaining a safe operational environment is critical, as they mitigate risks associated with excessive pressure and maintain the structural integrity of the digester.