Wastewater treatment and resource recovery for poverty alleviation: a combined duckweed and water hyacinth pond system
dc.contributor.advisor
Crapper, Martin
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dc.contributor.advisor
Chatzisymeon, Efthalia
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dc.contributor.author
Hounkpe Wendeou, Sèna Peace
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dc.contributor.sponsor
other
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dc.date.accessioned
2017-03-09T10:44:27Z
dc.date.available
2017-03-09T10:44:27Z
dc.date.issued
2016-06-27
dc.description.abstract
Floating macrophyte pond systems, with the ability to produce nutrient
enriched plants simultaneously with wastewater treatment, are a sustainable
solution to contribute to environmental protection and safe nutrient recovery
from domestic wastewater. However, to meet the requirements for reuse with
high strength wastewater containing high levels of metal pollution generated in
developing countries, an adequate combination of water hyacinth and
duckweed ponds is proposed in order to take advantage of the best
characteristics of each of these macrophyte ponds.
This research focused on the advancing of the understanding of the effectiveness
of treatment and resource recovery under the effect of changing operational
parameters such as pH, light intensity, influent metal content and fluctuating
pollutants loading rate on pond performance and recycling ability in order to fill
the noticed gap of knowledge.
Experiments conducted in water hyacinth ponds (WHP), under batch and
tropical natural weather conditions, revealed that pH between 6.4 and 7.1, full
sunlight and seven days hydraulic retention time were optimum for plant
biomass production and pollutant removal in WHP. WHP was able to regulate
pH when the initial pH values moved outside this interval with a drop in
biomass production as a side effect. These ponds showed a first order kinetic for
the removal of iron, zinc and copper from aqueous solution and their
accumulation in plants biomass with a preferential sequence Fe>Zn>Cu.
However the presence of metals in water hyacinth biomass led to the reduction
in ponds performances and a risk of re-pollution of the effluent through the
release of metals into water.
A comparative study carried out over sixty-two weeks in a pilot scale combined
water hyacinth and duckweed ponds (DWP) channel and waste stabilization
ponds channel working under fluctuating loading rates showed different
environmental conditions occurred these ponds. The fluctuating loading rate
was also found to have a reduced effect on the combined WHP/DWP channel
performance and effluent quality stability with the effluents meeting the entire
reuse requirement at high hydraulic flow rate (retention time greater than 20
days). Fish was able to grow in the WHP/DWP channel.
Results suggested some guidelines on WHP/DWP system design, operation and
maintenance. The overall outcome of this research is a significant contribution to
the development of integrated combined WHP/DWP technology for treatment
of wastewater and resource recovery on site.
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dc.identifier.uri
http://hdl.handle.net/1842/20965
dc.language.iso
en
dc.publisher
The University of Edinburgh
en
dc.relation.hasversion
Hounkpè, S. P., E. C. Adjovi, M. Crapper and M. P. Aïna (2013). "Mise au point d'un système intégré de gestion des eaux usées." Revue Ivoirienne des Sciences et Technologies 21&22: 173 154.
en
dc.relation.hasversion
Hounkpè, S. P., E. C. Adjovi, M. Crapper and E. Awuah (2014). "Wastewater Management in Third World Cities: Case Study of Cotonou, Benin." Journal of Environmental Protection 5(05): 387.
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dc.subject
waste water
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dc.subject
poverty
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dc.subject
water hyacinth ponds
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dc.subject
duckweed ponds
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dc.title
Wastewater treatment and resource recovery for poverty alleviation: a combined duckweed and water hyacinth pond system
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dc.type
Thesis or Dissertation
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dc.type.qualificationlevel
Doctoral
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dc.type.qualificationname
PhD Doctor of Philosophy
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