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
Effects of hydraulic load on nitrate removal in surface-flow constructed wetlands
Halmstad University, School of Business and Engineering (SET).
2011 (English)Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

Abstract

Constructed wetlands had been widely used as economical and environment friendly treatment systems for agriculture runoff in southwest Sweden to limit the transport of nutrients to Kattegat, thereby aiding in the effort of abating eutrophication. The extensive use and acceptance of wetlands as treatment systems had been an incentive to develop performance models. Even recent studies showed that first order models are inadequate to guide the design of constructed wetlands, these are still commonly used. The main assumption of such models is tested here, which states that the removal rate of pollutant(s) is proportional to concentration in a constructed wetland. For this purpose experimental wetlands in Plonninge near Halmstad (southwest of Sweden) were selected and divided into two groups (9 each). They were fed with different hydraulic loads achieving 4 and 8 days residence times. The data obtained from the analysis of total nitrogen and nitrate were tested with first order equations and found that these models are sufficient to describe the nitrate removal in nitrate rich experimental wetlands.

Key words: constructed wetlands, hydraulic load, first order kinetic models, eutrophication, nitrogen removal

Abstract [sv]

Abstrakt

Anlagda våtmarker har i stor utsträckning använts så ekonomisk och miljövänlig behandling av system för jordbruk avrinning i sydvästra Sverige för att begränsa transporten av näringsämnen till Kattegatt och därmed hjälpa till i ansträngningarna på att avta övergödning. Den omfattande användningen och acceptansen av våtmarker som behandling systemen hade ett incitament att utveckla prestanda modeller. Även senare studier visade att första order modellerna är otillräckliga för att vägleda designen av konstgjorda våtmarker är dessa fortfarande vanliga. Det viktigaste antagandet om sådana modeller testas här, som säger att avverkning av föroreningar (s) är proportionell mot koncentrationen i en konstruerad våtmark. För detta ändamål experimentella våtmarker i Plönninge utanför Halmstad (sydväst om Sverige) valdes ut och delades i två grupper (9 vardera). De matades med olika hydrauliska belastningar uppnå 4 och 8 dagar uppehållstid. De data som erhållits från analysen av totalkväve och nitrat testades med första ordningens ekvationer och fann att dessa modeller är tillräckliga för att beskriva nitrat bort i nitrat rika experimentella våtmarker.

Nyckelord: anlagda våtmarker, hydraulisk belastning, första ordningens kinetiska modeller, övergödning, kväverening

Place, publisher, year, edition, pages
2011. , 36 p.
Keyword [en]
keyword1, keyword2
National Category
Other Environmental Engineering
Identifiers
URN: urn:nbn:se:hh:diva-15148OAI: oai:DiVA.org:hh-15148DiVA: diva2:426142
Subject / course
Environmental Science
Presentation
2011-05-26, O104, Halmstad University, Halmstad, 16:25 (English)
Uppsok
Life Earth Science
Supervisors
Examiners
Available from: 2011-06-23 Created: 2011-05-26 Last updated: 2011-06-23Bibliographically approved

Open Access in DiVA

Effects of HLR on CWs Efficiency, Imran(526 kB)693 downloads
File information
File name FULLTEXT01.pdfFile size 526 kBChecksum SHA-512
fcb7e10d03e8f069ca163e01252bd4f69712cfcdeb00cef3eabd6aa644a775010f691b5949af20233a7d03d95fab600a556ed14c9a0288d9fc4c394c7d421f00
Type fulltextMimetype application/pdf

By organisation
School of Business and Engineering (SET)
Other Environmental Engineering

Search outside of DiVA

GoogleGoogle Scholar
Total: 693 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: 187 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