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Inventering och analys avberedningsprocessen vid Österbybruksvattenverk Sandgropen
2010 (Swedish)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Österbybruk´s water treatment plant serves the municipalities of Österbybruk and Dannemora

with drinking water. The raw water comes from three different ground water resources and

one of them, Kyrkholmen, contains relatively high concentrations of iron and manganese. The

process utilizes potassium permanganate to oxidize the iron and manganese. The purification

process consists of several steps and the question is why the different purification steps exist

and if they are fulfilling the desired function. In this thesis the whole water treatment plant

was analyzed and several faults were discovered.

A number of different analyses and tests were performed to check the function of the water

treatment plant. The most important part was possibly the oxidation tests with air and

potassium permanganate. The tests with aeration were performed to control if it could be a

viable alternative method to the usage of potassium permanganate. In the tests with potassium

permanganate the optimal dosage and contact time were tested. The oxidization of iron with

air worked quite well but in the case of manganese it was more problematic. Only a small

decrease in the manganese level was detected. In the experiments with potassium

permanganate a high decrease of the manganese concentration was achieved. If the potassium

permanganate dosage is not too low, the sand filters will reduce the levels of manganese to

less than 0.05 mg/l. In case of the iron an oxidization with the organic material in the water

occurs and because of that the residue levels after the sand filters is a subject to some

variation. The optimal dosage of potassium permanganate depends on the start levels of iron

and manganese in the raw water.

There were a number of faults in the plant; e.g. the disinfection with chlorine and the water

softening through ion-exchange is not the right type of process solutions for the fairly difficult

water. The main problem is due to the content of organic material and the high alkalinity. The

high alkalinity makes that the carbonic acid removal step function is unsatisfactory. The

purification process in usage is not worth investing in, partly because of the faulty function

and also because of old age of the equipment.

Place, publisher, year, edition, pages
2010.
Series
UPTEC W, ISSN 1401-5765 ; 10 027
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:uu:diva-350597OAI: oai:DiVA.org:uu-350597DiVA, id: diva2:1205503
Educational program
Master Programme in Environmental and Water Engineering
Supervisors
Examiners
Available from: 2018-05-14 Created: 2018-05-14 Last updated: 2018-05-14Bibliographically approved

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Citation style
  • apa
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