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Accueil du site → Master → Pays Bas → 2014 → Assessment of the efficiency of a constructed wetland treating domestic wastewater : [a case study of the Egerton University constructed wetland]

UNESCO-IHE Institute for Water Education, Delft (2014)

Assessment of the efficiency of a constructed wetland treating domestic wastewater : [a case study of the Egerton University constructed wetland]

Makokha, D.N.

Titre : Assessment of the efficiency of a constructed wetland treating domestic wastewater : [a case study of the Egerton University constructed wetland]

Auteur : Makokha, D.N.

Université de soutenance : UNESCO-IHE Institute for Water Education, Delft

Grade : Master of Science (MS) 2014

Résumé partiel
Constructed wetlands (CW) have proven to be an effective technology in controlling the amount of pollutionreleased in natural water bodies. Though there is huge potential for application of wetland technology in the developing world, the technology has not received extensive development. Lack of enough knowledge andexperience in CW design and management is among the major factors contributing to the limitation in the widespread application of the technology in developing countries. These factors have in most cases greatlycontributed to the inefficiencies in the wastewater treatment processes of some established CW systems. Such as the case of the Egerton University CW whose performance is purported to be way below the expectationsyet no extensive study has been conducted to establish the removal efficiencies in the system. The main objective of this study was thus to assess the treatment efficiency of the Egerton University wastewater treatment system. The system consists of WSPs and a CW which serves a polishing function. Characterization of the WSPs and all the CW cells was done by analyzing the water quality parameters to assess the removal efficiency of nutrients and organic pollutants. Discharge measurements into and out of each cell of the CW as well as water mass balance determination and flow path identification was also incorporated in the research study.From the water mass balance calculation, 83.9% of water is lost from the CW which could be due to the existence of a hydrologic interaction between the surface water in the CW and the underground aquifers through seepage. Sodium chloride tracer test was employed in the identification of wastewater flow path. An experimental hydraulic retention time of 7 hours was obtained from the test less than the theoretical one of 24 hours

Sujets  : constructed wetlands domestic wastewater wastewater treatment mass balance case studies Kenya

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