[Mainland China] Tsinghua and OriginWater Jointly Publish in Nature Communications: Replacing Aeration with Mechanical Vibration — Vibrating Membrane Bioreactor Passes 800-Day Engineering Validation with 24% Reduction in Total Power Consumption

School of Environment, Tsinghua University Professor Huang Xia's team, together with Beijing OriginWater Technology Co., Ltd. and Beijing Normal University, published research findings in Nature Communications: using horizontal reciprocating mechanical vibration to replace traditional aeration to control membrane fouling, and deeply integrating it with the AAOA process, completing approximately 800 天 parallel comparison at engineering scale of 7500 m³/day. The results are: effluent Total Nitrogen reduced by approximately 22%, chemical phosphorus removal chemicals saved by approximately 40%, membrane fouling control energy consumption reduced by 75%, total electricity consumption reduced by 24%, carbon footprint reduced by 30%.

An old problem spanning over a century: half of MBR's electricity is spent on "blowing bubbles"

Membrane Bioreactor (MBR) uses membrane separation to replace secondary clarifiers, offering good effluent quality and saving land, and has rapidly expanded in municipal and industrial wastewater treatment over the past two decades. But its weakness is equally obvious—membrane fouling.

Traditional aerated MBR (AMBR) relies on continuous aeration to scour the membrane surface to control fouling, and aeration energy consumption typically accounts for 35%—50% of the total energy consumption of a wastewater treatment plant. What's more troublesome is the side effect: high-intensity aeration maintains the membrane tank in a high Dissolved Oxygen environment, and the dissolved-oxygen-rich return flow enters the anoxic zone and anaerobic zone, directly interfering with biological nitrogen and phosphorus removal, creating an awkward cycle of "destroying denitrification in order to clean the membrane."

• Energy consumption pain point—aeration is used both for biological oxygen demand and for membrane surface scouring, and the two needs are bound to the same system, making it impossible to optimize them separately.
• Water quality pain point—high dissolved oxygen return flow disrupts the anoxic environment, Denitrification is insufficient, nitrogen removal efficiency is limited, and additional carbon sources and phosphorus removal chemicals are often needed to compensate.
• Operation and maintenance pain point—bubble shear distribution is uneven, fouling rates vary greatly at different positions of the membrane module, and local fouling drags down the operation of the entire tank, with cleaning frequency and chemical costs rising accordingly.

The three pain points point to the same crux: can "oxygen supply" and "membrane surface scouring" be separated?

The solution approach: replacing air with mechanical vibration

The research team's answer is straightforward—using horizontal reciprocating mechanical vibration to replace aeration as the membrane fouling control method, and deeply integrating it with the AAOA (Anaerobic—Anoxic—Aerobic—Anoxic) biological treatment process to form a Vibrating Membrane Bioreactor (VMBR).

• Vibration replaces aeration scouring—the membrane module moves in a horizontal reciprocating manner, using mechanical shear to create continuous scouring on the membrane surface and inhibit cake layer thickening. This step shifts the energy consumption of membrane fouling control from "blowers" to "vibration devices," and the power magnitudes of the two differ greatly.
• Membrane tank maintains low Dissolved Oxygen—with no large amount of bubbles for oxygenation, the membrane tank maintains a low Dissolved Oxygen environment, and the return flow will not carry high-concentration Dissolved Oxygen back to the anoxic zone and anaerobic zone, allowing biological nitrogen and phosphorus removal to proceed in a more reasonable environment.
• Coupled with the AAOA process—the multi-stage configuration of Anaerobic, Anoxic, Aerobic, and Anoxic provides sufficient reaction environment for nitrogen and phosphorus removal, and the vibrating membrane tank is embedded as a sludge-water separation unit, with the two not interfering with each other yet synergistically enhancing performance.

This is not beaker verification in a laboratory. The team conducted a approximately 800 天 parallel comparison test on an actual facility at engineering scale of 7500 m³/day, placing VMBR and traditional AMBR under the same influent conditions for long-term comparison, which represents a rare level of verification intensity in membrane process research.

Five data points: where the savings are

The comparison results given in the paper can be divided into three categories: water quality, energy consumption, and stability.

• Effluent Total Nitrogen reduced by approximately 22% — Under the premise of comparable effluent COD and ammonia nitrogen concentrations, VMBR achieves significantly better Total Nitrogen removal than conventional aerated MBR, which is the direct return of preserving Denitrification capacity in a low Dissolved Oxygen environment.
• Chemical phosphorus removal reagent savings of approximately 40% — When reaching the same effluent Total Phosphorus standard, the dosage is greatly reduced, also benefiting from the biological phosphorus removal environment no longer being disrupted by high Dissolved Oxygen return flow. Reagent savings are not only a cost item but also a reduction item for sludge increment and carbon emissions.
• Membrane Fouling control energy consumption reduced by 75% — This is the most intuitive benefit of this study; mechanical vibration replaces continuous aeration, compressing the energy consumption of membrane scouring to one quarter of the original.
• Total electricity consumption reduced by 24% — Note that this is the total electricity consumption at the whole-plant level, not a single unit, indicating that the energy-saving effect is truly transmitted to the system level and has not been offset by other processes.
• Carbon footprint reduced by 30% — The decrease in electricity consumption combined with the reduction in reagent dosage jointly drives a significant improvement in carbon footprint; in addition, the average specific flux of VMBR is approximately 20% higher than conventional processes, the Membrane Fouling rate is slowed, and operational stability is better.

For operators, the most significant of these five figures are actually the latter three: electricity consumption, carbon footprint, and flux stability. The first two determine operating costs, and the third determines the membrane replacement cycle and cleaning regime, and these two areas are precisely the largest components of the whole-life-cycle cost of MBR projects.

Paper and Team: A Joint Verification Pathway of University + Enterprise

This achievement was published in Nature Communications under the title "Vibrating membrane bioreactors enhance nutrient removal and energy efficiency in municipal wastewater treatment," paper number DOI: 10.1038/s41467-026-75747-6.

• First Author — Lin Weichen, Lecturer at Beijing Normal University.
• Corresponding Authors — Professor Huang Xia (School of Environment, Tsinghua University), Senior Engineer Chen Chunsheng (Beijing OriginWater Technology Co., Ltd.).
• Verification Chain — From process development and reactor optimization to biofilm microecology analysis, a complete technical chain has been formed; the parallel comparison at an engineering scale of approximately 800 天 ensures that the conclusions do not rely on short-term data.

Universities provide mechanistic research and analytical methods, while enterprises provide engineering scenarios and long-term operational data. This pathway is particularly critical for the iteration of membrane processes — Membrane Fouling itself is a long-cycle phenomenon, and without long-term data from real engineering, it is difficult to judge whether a technology truly holds up.

Our Assessment

TIANYI TECH has long provided wastewater treatment and Reclaimed Water Reuse system solutions for municipal and Industrial Park clients. We believe that the value of VMBR lies not in "yet another new membrane," but in that it separates Membrane Fouling control from the biological treatment system for independent optimization, allowing oxygen supply, scouring, and Denitrification to each fulfill their proper roles. For project owners currently undertaking MBR upgrading or capacity expansion, there are three recommendations: First, when evaluating electricity consumption, calculate on a whole-life-cycle basis, incorporating membrane replacement and cleaning reagents, rather than comparing only initial investment; Second, if the existing MBR has long-standing problems of insufficient Denitrification and high phosphorus removal reagent dosage, priority should be given to investigating the Dissolved Oxygen and return flow pathways in the membrane tank, which is often more fundamental than adding chemicals; Third, pay attention to the long-term reliability and maintenance costs of mechanical vibration devices — this is the final hurdle that must be verified before engineering-scale promotion of this type of process.

About TIANYI LIMITED: TIANYI TECH is deeply engaged in the field of wastewater treatment and Reclaimed Water Reuse, committed to providing efficient, low-carbon, and sustainable water treatment solutions for municipal and industrial clients.