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For the successful implementation of this solution, it is important to ensure the microbial safety of treated greywater. This study examined the microbiological quality of treated greywater produced by an emergent nature-based technology (green roofs) and a chlorination process. Specifically, the effect of substrate, substrate depth, and vegetation on the removal of total coliforms, <jats:italic>Escherichia coli<\/jats:italic>, and enterococci in experimental green roofs treating greywater was examined for a period of about 12\u00a0months. In addition, the ability of chlorination to inactivate the abovementioned pathogen indicators was evaluated and their potential regrowth was examined. Results shown that green roofs filled with 10\u00a0cm of perlite reduce total coliform concentration by about 0.4 log units while green roofs filled with 20\u00a0cm of vermiculite reduce total coliform concentration by about 1.2 log units. In addition, the use of vegetation in green roofs improves the removal of pathogenic bacteria by about 0.5 log units in comparison with unvegetated systems. In all cases, the effluents of green roofs failed to satisfy the criteria for indoor reuse of treated greywater for non-potable uses such as toilet flushing without a disinfection process. The addition of 3\u00a0mg\/L of chlorine in the effluent provided safe greywater microbiological quality for storage periods of less than 24\u00a0h, while longer periods resulted in the significant regrowth of pathogens. In contrast, a chlorination dose of 7\u00a0mg\/L completely secured inactivation of pathogen indicators for periods of up to 3\u00a0days.<\/jats:p>","DOI":"10.1007\/s11356-022-23755-6","type":"journal-article","created":{"date-parts":[[2022,10,27]],"date-time":"2022-10-27T00:02:36Z","timestamp":1666828956000},"page":"22560-22569","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":13,"title":["Removal of pathogens from greywater using green roofs combined with chlorination"],"prefix":"10.1007","volume":"30","author":[{"given":"Ioanna","family":"Petousi","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Vasiliki","family":"Thomaidi","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Nikolaos","family":"Kalogerakis","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9942-5716","authenticated-orcid":false,"given":"Michail S.","family":"Fountoulakis","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2022,10,27]]},"reference":[{"key":"23755_CR1","doi-asserted-by":"publisher","first-page":"89","DOI":"10.1016\/j.jksues.2012.05.003","volume":"25","author":"AM Abdel-Kader","year":"2013","unstructured":"Abdel-Kader AM (2013) Studying the efficiency of grey water treatment by using rotating biological contactors system. 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