Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
A study of the lime addition system at the Luleå drinking water treatment plant
2001 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The purpose of this report is to give an explanation of the results of the lime distribution system at the Luleå drinking water treatment plant. The lime addition is the second step of treatment after chlorination and is used for the control of pipe corrosion in the distribution net. The goal of this work was to study the turbidity variations as a function of the lime addition and the lime dissolution. A precedent study (Céline Sotty, 2000) showed that the current system had some problems concerning high remaining turbidity in the treated water. It might be due to a too small volume of the lime dissolution tanks. So some solutions had to be found in order to improve the efficiency of the system. The work was first concentrated on solutions consisting in finding the ideal mixing of the lime to increase its dissolution and accelerate the decrease of turbidity by doing a first series of experiments at a university laboratory. Descriptions of the relative influence of several parameters (duration of the resting time, speed of mixing, occurrence of another mixing later in the process) on the lime deposition were next performed to understand how the decrease of turbidity in the treated water occurred. Afterwards, a second series of experiments was done at the Luleå drinking water treatment plant to evaluate the influence of a grid in the resting tank on the decrease of turbidity in the lime addition system. First it led to the conclusions that the lime dissolution system of the drinking water treatment plant was not efficient enough concerning the turbidity of the water. Secondly it was suggested that some money could be saved by using less lime in the lime distribution system. Finally, three solutions were described to decrease the turbidity value in the water. A good way to obtain a reduced turbidity at the end of the system would be to mix the water slowly in the resting tank instead of simple rest. A grid in the resting tank could simulate a slow mixing and would allow a better decrease of the turbidity. At last, a good solution, but an expensive one, would be to build another resting tank in order to help the lime to dissolve in the water without depositing. Calculations about the volume of the new reservoir were done in the report.

Place, publisher, year, edition, pages
2001.
Keyword [en]
Technology, drinking water treatment, turbidity, lime dissolution, lime, deposition
Keyword [sv]
Teknik
Identifiers
URN: urn:nbn:se:ltu:diva-48481ISRN: LTU-EX--01/200--SELocal ID: 5ee01054-eabe-4cc7-822e-74836e5a4784OAI: oai:DiVA.org:ltu-48481DiVA: diva2:1021823
Subject / course
Student thesis, at least 30 credits
Educational program
Environmental Engineering, master's level
Examiners
Note
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

Open Access in DiVA

No full text

Search outside of DiVA

GoogleGoogle Scholar

Total: 10 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf