Two-step granular activated carbon filtration in drinking water treatment

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en Vahala, Riku 2012-02-10T09:42:12Z 2012-02-10T09:42:12Z 2002-11-29
dc.identifier.isbn 951-22-6173-1
dc.identifier.issn 1456-8314
dc.description.abstract In the treatment of Finnish surface waters, the main objective is to reduce natural organic matter (NOM) before the water is disinfected. In many treatment plants, granular activated carbon (GAC) filtration is applied for the enhanced removal of NOM after conventional treatment. The aim of this study was to assess the performance of two-step GAC filtration in NOM removal and to determine its effects on the water quality in the distribution system. Furthermore, the optimal operation conditions of the existing process scheme at Helsinki Water's treatment plant after installing two-step GAC filtration and UV disinfection was evaluated. The study revealed that the major factors influencing the effective NOM removal in GAC filtration are the choice of GAC type and the frequency of regeneration. Other factors, such as empty bed contact time and biological degradation rate, were of minor importance. However, even the fully exhausted "old" GAC effectively decreased the assimilable organic carbon (AOC) and the regrowth of heterotrophic bacteria in the distribution system. The most interesting finding of the study was that introducing GAC filtration and UV disinfection increased the nitrification in the chloraminated distribution system. Introducing GAC filtration is a challenge for the more efficient use of the existing treatment process. Although optimal ozonation probably provided the highest biological activity in the following exhausted GAC filters, alone it does not justify the use of ozone. After installing GAC filtration and UV disinfection, the role of ozone is rather to provide an additional barrier against unexpected changes in the source water quality. en
dc.format.extent 81, [81]
dc.format.mimetype application/pdf
dc.language.iso en en
dc.publisher Helsinki University of Technology en
dc.publisher Teknillinen korkeakoulu fi
dc.relation.ispartofseries Helsinki University of Technology, Laboratory of Water and Wastewater Engineering en
dc.relation.ispartofseries Teknillinen korkeakoulu, vesihuoltotekniikan laboratorio fi
dc.relation.ispartofseries 33 en
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dc.subject.other Environmental science en
dc.title Two-step granular activated carbon filtration in drinking water treatment en
dc.type G5 Artikkeliväitöskirja fi
dc.description.version reviewed en
dc.contributor.department Department of Civil and Environmental Engineering en
dc.contributor.department Rakennus- ja ympäristötekniikan osasto fi
dc.subject.keyword adsorption en
dc.subject.keyword natural organic matter en
dc.subject.keyword optimization en
dc.subject.keyword biological processes en
dc.identifier.urn urn:nbn:fi:tkk-002104
dc.type.dcmitype text en
dc.type.ontasot Väitöskirja (artikkeli) fi
dc.type.ontasot Doctoral dissertation (article-based) en
dc.contributor.lab Laboratory of Water and Wastewater Engineering en
dc.contributor.lab Vesihuoltotekniikan laboratorio fi

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