Tennessee Wastewater Operator Practice Exam

What type of screen should be covered on a chlorination vent line?

1. Plastic mesh

2. Non-corrodible fine mesh screen

3. Metal grid

4. Open vent

The correct answer is: Non-corrodible fine mesh screen

A non-corrodible fine mesh screen is the correct choice for covering a chlorination vent line because it effectively serves to prevent debris, birds, or insects from entering the vent while also withstanding the corrosive effects of chlorine gas. Chlorine systems can produce harsh conditions due to the chemical properties of chlorine; therefore, using a material that resists corrosion is essential for maintaining the integrity and functionality of the vent system over time. Fine mesh also allows for the free passage of gases without causing obstruction, ensuring that the system can vent properly and maintain appropriate pressure. This is critical for safety; a blocked vent could lead to dangerous buildup of pressure or gaseous leaks. In contrast, other materials such as plastic mesh or a metal grid may not provide the same level of protection or could deteriorate faster due to the corrosive environment present in a chlorination system. An open vent would be inadequate as it leaves the vent unprotected against environmental intrusions.