Part 1: Optimized Cleaning Strategies for Energy Reduction in Membrane Bioreactor (MBR) OperationsAbstractThis study explores an optimized clean...
Published on by Hossein Ataei Far, Deputy Manager of the Research, Technology Development, and Industry Relations Center at NWWEC
Abstract
This study explores an optimized cleaning strategy for Membrane Bioreactor (MBR) operations to reduce energy consumption while maintaining high filtration performance. The proposed approach integrates intermittent air scouring, chemical antifouling treatment, water backwashing in cyclical processes, and Clean-In-Place (CIP) procedures for long-term MBR operation. By leveraging recent advancements in membrane cleaning technologies, this methodology minimizes operational costs and extends membrane longevity (Wang et al., 2014).
1. Introduction
Membrane Bioreactors (MBRs) are widely used in wastewater treatment due to their ability to produce high-quality effluent. However, membrane fouling and high energy consumption pose significant challenges. This study proposes an integrated cyclic cleaning strategy to address these issues while improving operational efficiency and sustainability (Krzeminski et al., 2016).
2. Proposed Methodology
The cleaning cycle consists of three key stages:
Intermittent Air Scouring – Short bursts of air scouring replace continuous aeration, optimizing intensity and frequency to reduce energy consumption.
Chemical Antifouling Treatment – Periodic application of low-concentration chemicals removes biofouling and organic/inorganic deposits without excessive chemical usage.
Water Backwashing – Permeate water flushes away dislodged foulants and residual chemicals, preventing reattachment and maintaining membrane performance (Wang et al., 2014; Krzeminski et al., 2016).
Additionally, Clean-In-Place (CIP) procedures play a crucial role in the long-term maintenance of MBR membranes by effectively removing persistent foulants that physical cleaning alone cannot address (Judd, 2024).
3. Literature Review
Recent studies have explored various strategies for optimizing MBR operations:
Wang et al. (2014) emphasized that cleaning procedures are integral to the long-term operation and maintenance of membranes. Their review highlighted that optimizing cleaning strategies—particularly reducing the frequency and intensity of cleaning—can improve energy efficiency and lower chemical consumption.
Krzeminski et al. (2016) examined recent developments in MBR systems, focusing on energy reduction, fouling control, and novel configurations. They found that advanced aeration and cleaning methods, such as intermittent air scouring, significantly reduce energy consumption compared to continuous aeration.
A review indicated that aeration accounts for 60–80% of total MBR energy consumption, underscoring the importance of aeration control strategies (PMID: 9965322).
Figure 1: Market drivers for MBR technology and examples of MBR plants (Pawel Krzeminski et al.).