California Wastewater Treatment Operator Practice Exam

What is one advantage of using membrane bioreactors (MBRs)?

1. Lower operational costs

2. Higher quality effluent and reduced footprint of treatment facilities

3. Enhanced chemical dosage accuracy

4. Increased energy consumption

The correct answer is: Higher quality effluent and reduced footprint of treatment facilities

Membrane bioreactors (MBRs) combine biological treatment processes with membrane filtration, utilizing membranes to separate clarified effluent from mixed liquor in a single unit. One significant advantage of MBRs is their ability to produce higher quality effluent compared to traditional treatment methods. This is primarily due to the effective removal of suspended solids and pathogens, leading to effluent that meets stringent discharge standards and is suitable for reuse applications. Additionally, MBRs typically require a smaller physical footprint than conventional treatment systems because they integrate processes that might otherwise be spread across multiple units. This compact design allows for more efficient land use, which is particularly beneficial in urban areas where space is limited. By providing a high-quality effluent along with reduced space requirements, MBRs are an attractive option for modern wastewater treatment facilities aiming to improve efficiency and meet regulatory demands.