2024-03-062024-03-062007-05-14Alkan, U. vd. (2007). "Bacterial regrowth potential in alkaline sludges from open-sun and covered sludge drying beds". Environmental Technology, 28(10), 1111-1118.0959-3330https://www.tandfonline.com/doi/epdf/10.1080/09593332808618872https://hdl.handle.net/11452/40234The aim of this study was to compare the regrowth potentials of wastewater sludges dried in two pilot-scale drying processes namely, Open-Sun Sludge Drying Bed (OSDB) and Covered Sludge Drying Bed (CSDB). Quicklime and/or coal fly ash were added to raw sludge samples prior to drying processes in order to enhance bacterial inactivation. Following three drying cycles (March-April, June-July and August-October), sludge samples were taken from the beds for the regrowth experiments. Addition of alkaline materials prevented the regrowth of faccal coliforms in all rewetted samples except for the samples obtained after the rainfall events in OSDB. Rewetting of these samples in the regrowth experiments increased faccal coliform numbers by 3.5-7 log units. In contradiction, the observed bacterial numbers in rewetted alkaline samples from CSDB were below the EPA Class B criterion (2 million MPN g(center dot 1) dry sludge). The combination of additional heat from solar collectors, protection from the rain and the unfavourable living conditions owing to alkaline materials appeared to inactivate bacteria more effectively in CSDB and hence eliminated regrowth potential more efficiently.eninfo:eu-repo/semantics/openAccessDrying bedsRegrowth potential wastewater sludgeFaecal coliformFly ashQuicklimeLime-stabilizationFecal-coliformsEnvironmental sciences & ecologySewage-sludgeWaste-waterSoilPathogensColiform bacteriaGrowth kineticsRainSolar collectorsSewage sludgeWastewaterBacteria (microorganisms)Calcium oxideCoal ashFly ashCollector efficiencyLimeEnvironmental Protection AgencyRainBacterial inactivationWastewater sludgeBacterial numbersRegrowth experimentsBacterial regrowth potentialsLiving conditionsDrying bedFaecal coliformBacteriumSludgeFecal coliformRewettingFly ashWastewaterRegrowthRegrowthArticle0002503697000052-s2.0-3534893602511111118281017970517https://doi.org/10.1080/09593332808618872Environmental SciencesTorrefaction; Sewage; WoodCoalRainAlkalinityArticleBacterial countBacterial growthControlled studyExperimental designFecal coliformFly ashHeatNonhumanProcess technologySludge dryingSolar radiationSunWaste waterWettability1479-487X