Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.11889/4630
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dc.contributor.authorZimmo, Omar
dc.contributor.authorAl-Sa'ed, Rashed
dc.contributor.authorGijzen, Huub
dc.date.accessioned2017-03-21T13:08:04Z
dc.date.available2017-03-21T13:08:04Z
dc.date.issued2000-10
dc.identifier.citationWater Sci. Tech. 42(10/11), 215-222.en_US
dc.identifier.urihttp://wst.iwaponline.com/content/42/10-11/215
dc.identifier.urihttp://hdl.handle.net/20.500.11889/4630
dc.description.abstractIn laboratory-scale batch experiments, duckweed (Limna gibba)-based and algae-based wastewater containers have been monitored over 15 days in two experiments with different initial total nitrogen concentrations of 50 (experiment 1) and 100 mg-N/L (experiment 2). Clear differences in environmental conditions were observed. High dissolved oxygen (DO) concentrations were observed in the algae-based ,compared to duckweed-based, containers. In the algae-based containers the DO range was between 2.1 to 6.6 mg/L and 1.2 to 4.3 mg/L in experiment 1 and 2, respectively, whereas in the duckweed-based containers DO ranged between 1.1 to 3 mg/l and 0.5 to 2.1 mg/L. Higher pH values were measured in algae-based due to algal photosynthetic activity compared to duckweed-based containers where the duckweed mat prevented sunlight penetration and hence algal development. In algae-based containers, the pH range was 7.9 to 8.6 and 8.1 to 8.4 in experiments 1 and 2, respectively, and 7.3 to 7.5 and 7 to 7.6 in the duckweed-based containers. Depending on initial nitrogen concentrations, duckweed-based containers removed between 42%–62% of total nitrogen and between 56%–95% of Kjeldahl nitrogen from the wastewater, while algae-based containers removed between 45%–48% and 48%–58% of total nitrogen and Kjeldahl nitrogen, respectively. Nitrogen loss, probably due to denitrification and ammonia volatilisation, represents 40% of the total nitrogen content of algae-based and duckweed-based containers. However, in duckweed-based containers only 28% of N-loss was observed in containers with higher initial N-content. This study demonstrates that there were differences in environmental conditions in algae-based and duckweed-based containers, which have caused differences in nitrogen transformation mechanisms.en_US
dc.description.sponsorshipThe authors are grateful to the Dutch government for financially supporting this research within the scope of the collaboration project “Water Sector Capacity Building in Palestine” between Birzeit University, West Bank and the International Institute for Infrastructural, Hydraulic and Environmental Engineering (IHE), The Netherlands.en_US
dc.language.isoenen_US
dc.publisherIWA Publishing, Londonen_US
dc.subjectDenitrificationen_US
dc.subjectWater -Purification - Particle removalen_US
dc.subjectAlgaeen_US
dc.subjectDuckweedsen_US
dc.subjectEffluent qualityen_US
dc.subjectWater - Reuseen_US
dc.titleComparison between algae-based and duckweed-based wastewater treatment: differences in environmental conditions and nitrogen transformations.en_US
dc.typeArticleen_US
newfileds.departmentInstitute of Environmental and Water Studiesen_US
newfileds.item-access-typeopen_accessen_US
newfileds.thesis-prognoneen_US
newfileds.general-subjectEngineering and Technology | الهندسة والتكنولوجياen_US
item.languageiso639-1other-
item.fulltextWith Fulltext-
item.grantfulltextopen-
Appears in Collections:Institute of Environmental and Water Studies
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