Class 4 (4th Engineer) MEP 📅 Feb 2025

Exam Question

A biological sewage system develops a fault, which necessitates opening the unit for repair:

(a) The risk associated with opening he unit. (6)

(b) The precaution taken to reduce the risk. (6)

Reference Answer

### (a) The Risks Associated with Opening the Unit (6 Marks)
Opening a biological sewage treatment plant (STP) for repair is a hazardous operation. The primary risks are associated with exposure to a dangerous atmosphere, direct contact with pathogenic material, and the physical dangers of working in a confined space. A comprehensive understanding of these risks is essential for safe execution of work.
1. **Atmospheric Hazards (Asphyxiation, Poisoning, and Explosion)**:
* **Toxic Gases**: The anaerobic and aerobic decomposition of organic waste produces several hazardous gases.

Full answer on MeoMock — surveyor-grade reference answers for 7,000+ written exam questions.

View plans Browse library

← Browse more questions

Prepare on Android — MeoMock on Google Play