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A study of water treatment process at the drinking water plant of Luleå
2000 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

This report relate the results of a water treatment process study at the Luleå drinking water plant. This plant is an artificial groundwater recharge. The treatment taking place in this plant uses two steps: a chlorination in order to disinfect the water and a corrosion control by addition of lime (Ca(OH)2) and carbon dioxide. The objectives of this study were: a turbidity study all over the process to give a picture of the turbidity variations and an idea of the effluent turbidity, a turbidity study of the lime dissolution system to conclude about the efficiency of the system and eventually give some solution to improve the efficiency if not enough at the moment and finally a conductivity study of the raw water in order to look for a correlation with the hardness as well as with the alkalinity. First it can be concluded that the raw water turbidity was high, some daily variations due to the start up of the pumps in the wells appeared. Different hypothesis are proposed to explain those fluctuations but none of them can be chosen with certainty to be responsible for this phenomena. The effluent water turbidity was influenced by the lime addition, and the daily variations still show up. Secondly the lime dissolution system was not efficient enough, the remaining turbidity was two high. The dissolution volume of the actual system was found not big enough. Calculation were done to estimate the volume of a new tank needed. Finally, hardness as well as alkalinity were found to correlate to the conductivity of the raw water. A table to estimate the amount of lime to add regarding to the conductivity was created to more efficiently regulate the lime addition.

Place, publisher, year, edition, pages
Keyword [en]
Technology, artificial groundwater recharge, turbidity, conductivity, lime, dissolution
Keyword [sv]
URN: urn:nbn:se:ltu:diva-46315ISRN: LTU-EX--00/179--SELocal ID: 3f455ff0-1796-4d91-b109-fbe23b2b4349OAI: diva2:1019629
Subject / course
Student thesis, at least 30 credits
Educational program
Civil Engineering programmes 1997-2000, master's level
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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