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Functional study of the wastewater treatment plant of Sundom (Norrbotten, Sweden)
2000 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The Wastewater Treatment Plant of Sundom treats the domestic sewage of 300 inhabitants. It is located in the North of Sweden and has to deal with the rude climatic conditions characteristic for this region. The treatment consists of a mechanical, a biological (trickling filter) and a chemical (aluminium cation flocculation) steps. The WWTP has shown for years two significant drawbacks: a bad effluent quality in the wintertime and problems to treat the raw water during the snow melting period, due to a sharp increase in the daily inflow. The goal of this Master's Thesis was to investigate the factors responsible for the mediocre performance of the plant and to propose upgrading measures. Regular analyses of suspended solids, orthophosphorus and ammonia contents were carried out and coupled with the monitoring of the flow, pH, temperatures and dissolved oxygen concentrations along the treatment processes. It appears that the inflow is particularly concentrated in the winter resulting in an overloading of the biological step which shows bad removal performances. The internal water fluxes inside this step are also to blame. The chemical addition is effective but high dosage values were noticed. The deposition quality in the external pond seems to be deficient in the winter, when it is covered with a thick layer of ice. Propositions for a future upgrading of the plant were outlined. They deal with an improvement of the present facilities but also discuss the opportunity of global changes in the process.

Place, publisher, year, edition, pages
2000.
Keyword [en]
Technology, Wastewater, organic matter, suspended solids, orthophosphorus, trickling filter, aluminium sulphate precipitation, organic, loading, precipitation pond, upgrading measures
Keyword [sv]
Teknik
Identifiers
URN: urn:nbn:se:ltu:diva-57661ISRN: LTU-EX--00/185--SELocal ID: e4f15077-3baa-443e-bcdd-91cac23cc583OAI: oai:DiVA.org:ltu-57661DiVA: diva2:1031049
Subject / course
Student thesis, at least 30 credits
Educational program
Civil Engineering programmes 1997-2000, master's level
Examiners
Note
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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