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
Inhibition of phosphorus release from sediments of Lake Erhai through argon oxygen decarburisation slag (AOD) and electric arc furnace slag (EAF) capping.
KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering, Land and Water Resources Engineering.
2016 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The effects of eutrophication in lakes and the open seas has been largely the result of phosphorus (P) that accumulate in the sediment. Eutrophication occurs mainly in the waters in densely populated coastal areas and agricultural dominated areas and occurs when an excess of nutrients reach the soil and water. In situ capping is a proven method to inhibit P and is the method used in this study. A capping is placed on the polluted sediment surface to physically isolate it and reduce the release of P and prevent resuspension, i.e. suspension of already precipitated P. The possibility of inhibiting P by using sediment capping and the reactive filter materials (sorbents) argon oxygen decarburisation (AOD) slag in particle size fractions 0-0.5 mm and 2-8 mm and electric arc furnace (EAF) slag in particle size fraction 1-2.36 mm, have been investigated.

Soluble reactive phosphorus (SRP), also called orthophosphates, were the main species of P investigated in this study. A total of three studies were conducted in Lake Erhai in Dali China, during April 2016. One pre-study was conducted at ten different sites in the lake, which aimed to find the most P polluted site. This site was chosen for the main study. The main study aimed to investigate if the aforementioned sorbents managed to absorb  orthophosphates after contact with lake sediment for seven days. The post-study was conducted to see if the sorbents themselves released any orthophosphates into the water. The water samples were tested for pH, conductivity and dissolved oxygen (DO) before and after contact with lake sediment. The slag materials and lake sediment were studied with inductively coupled plasma (ICP) spectroscopy and X-ray diffraction (XRD) to detect elements and compounds.

Obtained results showed that the AOD slag (0-0.5 mm) could absorb 96% of the orthophosphates. However, both the AOD slag (2-8 mm) and EAF slag (1-2.36 mm) showed an increase of orthophosphates in the water after contact with lake sediment. The XRD analysis showed contents of silica (Si) and calcium (Ca) compounds in all of the slag materials, which was expected due to the configuration of these materials. The ICP analysis showed that 2% P was absorbed by the EAF (1-2.36 mm) slag, but there were no absorption by the AOD (0-0.5 mm) or AOD (2-8 mm) slag.

The conclusion from this study is that AOD slag (0-0.5 mm) can be used successfully in P remediation projects because it absorbs 96% of the orthophosphates. The results are consistent with previous results from (Zuo et al., 2015) and (Renman et al., 2013).

Place, publisher, year, edition, pages
2016.
Series
TRITA-LWR Degree Project, ISSN 1651-064X ; 2016:21
National Category
Civil Engineering
Identifiers
URN: urn:nbn:se:kth:diva-199181OAI: oai:DiVA.org:kth-199181DiVA, id: diva2:1060367
Educational program
Master of Science in Engineering - Chemical Science and Engineering
Examiners
Available from: 2016-12-28 Created: 2016-12-28 Last updated: 2016-12-28Bibliographically approved

Open Access in DiVA

fulltext(89623 kB)100 downloads
File information
File name FULLTEXT01.pdfFile size 89623 kBChecksum SHA-512
df59796cccfae05dd13b2e1ec69cf250b5a93410111e1f91c8ff9cb3209e3ebefa8eaea3a6781e697e238c8edc788127e259020352fcd46b19fd6b75c1e24adf
Type fulltextMimetype application/pdf

By organisation
Land and Water Resources Engineering
Civil Engineering

Search outside of DiVA

GoogleGoogle Scholar
Total: 100 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

urn-nbn

Altmetric score

urn-nbn
Total: 222 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