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Microplastic contamination and removal efficiency in greywater treatment using a membrane bioreactor
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Researchers evaluated a pilot-scale membrane bioreactor for removing microplastics from real household greywater and achieved removal rates of up to 90%. The dominant microplastic types found were polypropylene particles and polyester fibers, with most particles in the 101-300 micrometer size range. The study suggests that membrane bioreactor technology could be an effective tool for reducing microplastic discharge from buildings into the environment.
Microplastic (MP) contamination in aquatic environments is a critical concern due to its potential effects on aquatic ecosystems. MP contamination is often unsatisfactorily eliminated using conventional wastewater treatment systems. Membrane bioreactor (MBR) is a modern solution for wastewater treatment offering significant advantages over traditional activated sludge systems, such as a smaller footprint and the ability to produce high-quality effluent. In this study, a pilot-scale MBR was conducted to evaluate MP removal from real greywater. The overall treatment performance for MP removal reached up to 90%, with the MP concentration in the permeate effluent being 0.02 MP L-1. The major MP size distribution was 101-300 μm, with polypropylene as the predominant MP type. Remarkably, polyester fibers were highly predominant in the suspended sludge. Furthermore, Alphaproteobacteria, Bacteroidetes, and Actinobacteria were the predominant communities in the MBR sludge, which preferably formed a biofilm associated with MP accumulation. This study underscores the potential of MBR technology for efficient MP removal in household buildings, contributing to the mitigation of MP discharge into the environment. Implementing MBR systems is a crucial step toward safeguarding aquatic ecosystems and preserving environmental integrity with respect to the corresponding increase in MP pollution.
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Image 1_Microplastic contamination and removal efficiency in greywater treatment using a membrane bioreactor.tif
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Researchers conducted a pilot-scale membrane bioreactor (MBR) study to evaluate microplastic removal from real greywater, finding that the MBR provided significant removal efficiency advantages over conventional activated sludge systems for microplastic contamination.
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Your household wastewater from sinks, showers, and laundry (called "greywater") contains tiny plastic particles that wash off clothes and other products—and this study found that certain filtration systems using materials like biochar, gravel, and wetland-style setups can trap over 99% of these microplastics before the water gets reused or released into the environment. This matters because as more communities recycle greywater to conserve water, having effective filtration means fewer microplastics end up back in our environment and water supply, where they could eventually make their way into what we drink and eat.
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Among treatment technologies for microplastic removal from water, membrane bioreactors achieved the highest efficiency (>99%), followed by activated sludge (~98%) and rapid sand filtration (~97%), while hybrid treatment approaches showed the best overall removal performance.
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Researchers compared microplastic removal efficiency between a standard wastewater treatment plant and an advanced membrane bioreactor (MBR) system and found MBR technology achieved 99.7% removal — far outperforming conventional treatment — suggesting upgraded filtration systems are critical to keeping microplastics out of waterways.
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Every time you shower, do laundry, or wash dishes, the wastewater ("greywater") that goes down the drain carries tiny plastic particles called microplastics with it. This study measured how much of this plastic pollution comes from homes and city buildings, and tested whether filter systems designed to clean this water before it's reused or released into the environment can actually catch these particles. Understanding this matters because greywater is increasingly being recycled for things like irrigation, so knowing whether treatment systems can filter out microplastics helps determine if we're inadvertently spreading plastic pollution back into our water and food systems.
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