Membrane technology spans desalination, drinking-water treatment, wastewater reuse, industrial separation and point-of-use purification. The statistics below distinguish installed or reported output, research activity, modeled performance, historical forecasts and controlled trials across stated periods and geographies.
Key Membrane Technology Statistics
The most useful headline figures across the measured populations and periods are:
- In 2022, global desalination plants produced 109.22 million cubic meters of water per day.
- In the 2022 source context, more than 300 million people globally received water from desalination plants, according to an estimate.
- In the 2022 source context, the Middle East accounted for about 70% of worldwide desalination capacity, according to an estimate.
- In the 2022 source context, North Africa accounted for about 6% of worldwide desalination capacity, according to an estimate.
- From 2012 through 2019, UNESCO counted 36,126 desalination publications worldwide.
- Worldwide desalination publications increased from 3,298 in 2011 to 5,769 in 2019.
- Worldwide wastewater-treatment, recycling and reuse publications totaled 48,817 from 2012 through 2019.
- Commercial and institutional reverse-osmosis systems typically recovered 50% to 75% of feed water in 2024 EPA guidance.
- Fully optimized reverse-osmosis systems could achieve more than 90% recovery in 2024 EPA guidance, an estimate rather than a typical installed result.
- A 2022 systematic review found that membrane filtration averaged 5.7-log protozoa removal through evidence available to March 2022.
- The same review found that membrane filtration averaged 4.5-log bacterial removal through evidence available to March 2022.
- Reverse-osmosis membrane filtration averaged 4.9-log virus removal through evidence available to March 2022.
- In a WHO-summarized membrane study, Giardia removal ranged from above 4.7 to above 7.0 logs.
- In a WHO-summarized membrane study, Cryptosporidium removal ranged from above 4.4 to above 6.9 logs.
- In 2010, membrane bioreactors represented an estimated 51% of low-pressure membrane applications.
- Historical EPA market projections placed low-pressure membranes for reverse-osmosis pretreatment at $45 million in 2011 and $130 million in 2016.
- A 2022 review reported 99% salt rejection for membrane distillation in cited desalination studies.
- In a 2005 EPA verification test, the tested RO membrane achieved at least 98% removal of most challenge chemicals, excluding mercury, benzene and chloroform.
Contents
- Global desalination scale and membrane research trends
- Wastewater treatment, recycling and reuse data
- Reverse osmosis recovery and membrane performance
- Pathogen removal and contaminant outcomes
- Membrane markets, costs, energy and adoption indicators
- Process types, operating limits and test results
Global Desalination Scale and Membrane Technology Research Trends
Desalination statistics describe a major application area for membrane systems, but the reported capacity figures cover desalination broadly rather than membrane-only output.
According to the USGS Desalination page:
- Global desalination plants produced 109.22 million cubic meters per day in 2022.
- More than 300 million people globally received water from desalination plants in the 2022 source context; USGS attributes this estimate to the International Desalination Association.
- The Middle East used about 70% of worldwide desalination capacity, while North Africa used about 6%, in the same 2022 source context.
The figures below show why geography and definitions matter.
| Indicator | Period | Geography or scope | Reported value |
|---|---|---|---|
| Desalination plant production | 2022 | World | 109.22 million m³/day |
| Estimated people served by desalination | 2022 source context | World | More than 300 million |
| Estimated capacity share | 2022 source context | Middle East | About 70% |
| Estimated capacity share | 2022 source context | North Africa | About 6% |
| Carlsbad fresh-water production | Plant statistic reported by USGS | San Diego County, USA | 50 million gallons/day |
The USGS also reports that saline surface-water withdrawals for public supply in the United States were 7.21 million gallons per day in 2015 across the United States Virgin Islands, Texas, Florida and Massachusetts. Saline groundwater withdrawals for public supply totaled 263 million gallons per day in 2015 across Florida, California, Texas, Virginia, Kansas and Utah; both are withdrawal measures, not treated-water production or membrane-specific output.
UNESCO’s Clean water and sanitation factsheet measures research activity rather than deployment:
- UNESCO counted 36,126 desalination publications worldwide from 2012 through 2019.
- Global desalination publications rose from 3,298 in 2011 to 5,769 in 2019.
- UNESCO recorded 15,593 publications in 2012–2015 and 20,153 in 2016–2019.
- China produced 5,631 desalination publications during 2016–2019, compared with 2,979 in the United States.
- Indonesia’s desalination publications increased from 47 in 2012–2015 to 279 in 2016–2019.
These publication counts are bibliometric indicators, not installed capacity, membrane adoption or commercial output.
Membrane Technology Data on Wastewater Treatment, Recycling and Reuse
Wastewater research is broader than membrane treatment alone, so its publication totals should be read as an indicator for the surrounding treatment, recycling and reuse field.
UNESCO counted 48,817 worldwide publications from 2012 through 2019 on wastewater treatment, recycling and reuse. The source reports the following period comparison:
| Research indicator | 2011 or period | 2019 or later period | Geography |
|---|---|---|---|
| Annual publications | 4,170 in 2011 | 8,887 in 2019 | World |
| Publications by period | 19,417 in 2012–2015 | 29,400 in 2016–2019 | World |
| Indonesia publications | 64 in 2012–2015 | 411 in 2016–2019 | Indonesia |
China produced 8,904 publications during 2016–2019, while the United States produced 3,522 in the same broad wastewater topic. Indonesia’s output rose from 64 to 411 publications between the two reported periods.
UNESCO also reported Palestine’s publication intensity as 25/28 relative to the global-average notation used by UNESCO for 2012–2019. This is a bibliometric specialization measure, not a wastewater treatment rate or reuse percentage.
Because the topic includes membrane and non-membrane processes, these figures show research attention around wastewater treatment rather than membrane installations or recovered-water volumes.
Reverse Osmosis Recovery and Membrane Performance Statistics
Reverse osmosis recovery describes the share of incoming feed water that becomes treated water. The remainder is rejected or sent to concentrate management, and the applicable range depends on configuration and feed quality.
The EPA’s WaterSense at Work Section 7.1: Water Purification gives these 2024 guidance figures:
| RO or related measure | Reported value | Scope |
|---|---|---|
| Typical recovery | 50%–75% | Commercial and institutional RO |
| Typical feed rejected | 25%–50% | Commercial and institutional RO |
| Potential optimized recovery | More than 90% | Fully optimized RO systems |
| Nanofiltration particle-size capability | Down to 0.001 micron | EPA WaterSense guidance |
The recovery and rejection ranges are complementary guidance ranges, not universal measured averages. The greater-than-90% figure is a potential performance level for fully optimized systems, not a typical installed-system result.
EPA’s Overview of Drinking Water Treatment Technologies describes RO/NF processes as rejecting 15% to 30% of feed water in drinking-water treatment. This range differs from the commercial and institutional guidance because the scope and assumptions differ.
For point-of-use systems, EPA’s WaterSense Draft Specification for Point-of-Use Reverse Osmosis Systems Supporting Statement reports that ASSE 1086 requires a water-efficient POU RO system to achieve at least 40% efficiency, corresponding to 1.5 gallons sent down the drain per gallon treated. The same EPA source estimated typical POU RO systems at 10% to 20% efficiency in draft-specification context around 2021, based on stakeholder information and available products.
Membrane Filtration Pathogen Removal and Contaminant Outcomes
Log reduction value, or LRV, expresses base-10 reduction in a target organism or particle. These results are pooled or study-specific findings, so they do not guarantee identical performance in every membrane system.
A systematic review of Physiochemical Water Treatment Technologies included 165 original-data articles published from 1997 through March 2022. Its pooled membrane findings through March 2022 were:
| Membrane outcome | Average result | 95% confidence interval or context |
|---|---|---|
| Protozoa removal | 5.7 log | 5.4–6.0 |
| Bacterial removal | 4.5 log | 3.9–5.1 |
| RO virus removal | 4.9 log | 4.0–5.7 |
The same review reported 2.6-log bacterial removal for lime softening and 2.4-log bacterial removal for soil aquifer treatment, both non-membrane comparators. The pooled membrane estimates combine studies with varying water quality, membrane condition and operating parameters.
The WHO’s Water Treatment and Pathogen Control summarizes additional membrane studies:
- One membrane study reported Giardia removal from above 4.7 to above 7.0 logs.
- The same study context reported Cryptosporidium removal from above 4.4 to above 6.9 logs.
- A membrane with a defective seal still achieved 4.6-log Giardia removal and 4.2-log Cryptosporidium removal, but these are study-specific defective-seal results rather than normal design performance.
- A 0.2-micron MF pilot averaged 3.3–4.4-log removal of Giardia-sized particles and 2.3–3.5-log removal of Cryptosporidium-sized particles at a flux of 114–170 liters per square meter per hour.
Membrane Technology Markets, Costs, Energy and Adoption Indicators
Historical market estimates help separate application mix from revenue, installed capacity and current adoption. The EPA’s Trends in the U.S. Water Market Shaping Technology Innovation reports the following 2010 low-pressure membrane application shares:
| Application | Estimated share of low-pressure membrane use | Period |
|---|---|---|
| Desalination | 4% | 2010 |
| Membrane bioreactors | 51% | 2010 |
| Tertiary wastewater treatment | 13% | 2010 |
| Industrial applications | 14% | 2010 |
| Drinking-water processes | 18% | 2010 |
These are application shares, not revenue shares. The same report projected sales of low-pressure membranes for RO pretreatment to rise from $45 million in 2011 to $130 million in 2016; the 2016 value is a historical forecast horizon, not a verified actual in this source.
The report also said widespread commercialization of forward-osmosis membranes was not expected for another 3–5 years from its report context. That is a historical qualitative forecast and should not be interpreted as a current commercialization date.
Research activity also continued to expand in the UNESCO series: desalination publications rose from 15,593 in 2012–2015 to 20,153 in 2016–2019, but publication growth should not be treated as market growth or installed adoption.
Membrane Process Types, Operating Limits and Test Results
Different membrane processes target different separations. The Fouling, performance and cost analysis of membrane-based water desalination technologies review reported 90% salt rejection for nanofiltration in water softening and 99% salt rejection for membrane distillation in cited desalination studies.
The review findings are study syntheses, and performance depends on feed and operating conditions; nanofiltration is not presented here as removing sodium chloride for full desalination.
The WHO membrane summary provides operating-limit examples:
| Process or configuration | Reported result | Measurement context |
|---|---|---|
| MF membrane pore size | 0.08–0.22 micron | WHO-described MF study |
| MF removal of MS2 bacteriophage | Less than 1 log | Same study |
| Integrated NF/UF system pathogen removal | 6.3–11.0 logs | WHO summary |
| Hollow-fiber MF pretreatment | 0.2 micron | Integrated system |
| UF pretreatment cutoff | 100,000 daltons | Integrated system |
The integrated NF/UF result belongs to a combined system rather than a single membrane, and the WHO summary notes that some systems did not completely remove microbes. The MS2 result is study-specific; MS2 is smaller than the cited MF pore sizes.
The EPA’s US EPA Environmental Technology Verification Report: Removal of Chemical Contaminants in Drinking Water, Watts Premier WP-4V describes a controlled 2005 verification test of one point-of-use system:
- The RO membrane removed at least 98% of most challenge chemicals, excluding mercury, benzene and chloroform.
- Mercury reduction was 44%, benzene reduction was 85%, and chloroform reduction was 84%.
- TDS reduction by each membrane component was at least 95%.
- The combined RO membrane and carbon system removed at least 98% of all challenge chemicals.
These are trial results for the Watts Premier WP-4V test system. The combined membrane-and-carbon result cannot be attributed to the membrane alone, and the figures are not population estimates of household or commercial performance.