1. Biological treatment processes for wastewater can be categorised as dispersed growth and attached growth systems. Discuss the advantages and disadvantages of attached growth systems over dispersed growth systems.
2. Discuss the advantages and disadvantages of centralised versus decentralised wastewater management system for a regional city in Australia? Cite at least two references.
3. Discuss the situation where tertiary treatment is required and what are the main pollutants removed by tertiary treatment