Two-step granular activated carbon filtration in drinking water treatment

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.author Vahala, Riku
dc.date.accessioned 2012-02-10T09:42:12Z
dc.date.available 2012-02-10T09:42:12Z
dc.date.issued 2002-11-29
dc.identifier.isbn 951-22-6173-1
dc.identifier.issn 1456-8314
dc.identifier.uri https://aaltodoc.aalto.fi/handle/123456789/2240
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
dc.relation.haspart Vahala R., Ala-Peijari T., Rintala J., Laukkanen R. (1998) Evaluating ozone dose for AOC removal in two-step GAC filters. Water Science and Technology 37(9), 113-120.
dc.relation.haspart Vahala R., Långvik V.-A., R. Laukkanen R. (1999) Controlling AOX and THM formation by ozonation and two-step GAC filtration. Water Science and Technology 40(9), 249-256.
dc.relation.haspart Vahala R., Niemi R.M., Kiuru H., Laukkanen R. (1999) The effect of GAC filtration on bacterial regrowth and nitrification in a simulated water main. Journal of Applied Microbiology Symposium Supplement, 85, 178-185.
dc.relation.haspart Vahala R., Moramarco V., Niemi R.M., Rintala J., Laukkanen R. (1998) The effects of nutrients on NOM removal in BAC filtration. Acta hydrochimica et hydrobiologica, 26(3), 196-199.
dc.relation.haspart Vuorio E., Vahala R., Rintala J., Laukkanen R. (1998) The evaluation of drinking-water treatment performed with HPSEC. Environment International 24(5/6), 617-623.
dc.relation.haspart Vahala R., Rintala J., Järvinen A. (1996) Removal of TOC by two-step GAC filtration in cold humic waters. Proceedings of NOM workshop, September 18-19, Poitiers, France.
dc.relation.haspart Vahala R., Miettinen I.T., Laukkanen R. (1998) The effect of contact time, pH and ozone dose on the formation of biodegradable NOM during ozonation. Proceedings of IOA Conference on Ozonation and AOPs in Water Treatment, September 23-25, Poitiers, France, 31-1-8.
dc.relation.haspart Vahala R., Miettinen I.T., Korhonen S., Laukkanen R. (1998) Evaluation of operational conditions for intermediate ozonation. Proceedings of AWWA Water Quality Technology Conference, November 1-4, San Diego, California.
dc.relation.haspart Mikola A., Vahala R., Laukkanen R. (1999) The response of two-step GAC filters to backwashing. Proceedings of AWWA Water Quality Technology Conference, October 31-November 4, Tampa, Florida, CD-ROM.
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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