Table 2 Eligibility criteria
Criteria | Inclusion | Exclusion |
|---|---|---|
Types of study | Original articles, conference papers, and thesis | Review articles, books and any, letters to editor, record that has not efficient data |
Language | Studies that were in English language included | Studies that are in languages other than English that could make translating bias |
Population | Water, water treatment plant or water purification that it equipped with a reverse osmosis unit with drinking aims | Water for non-drinking purposes or treatment plants that are not equipped with reverse osmosis units |
Exposure | Reverse osmosis or RO, desalination, life cycle assessment, LCA | Other purification methods that RO has not the main role |
Comparator | Drinking water treatment plants with RO in comparison with other technologies | Failure to compare with RO |
Outcome | Carbon footprint, carbon emission, greenhouse gas emission or CO2 emission | No calculation or no expression of the amount of emission |
Duration | There is no limiting time | – |
Study area | Universal | – |