Ketema, Asaye (2009) Evaluation of Selected Plant Species for the Treatment of Tannery Effluent in a Constructed Wetland System. Masters thesis, Addis Ababa University.
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PDF (Evaluation of Selected Plant Species for the Treatment of Tannery Effluent in a Constructed Wetland System)
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Abstract
Constructed wetland is man made system aiming at simulating the treatment process in natural wetland by cultivating emergent, submerged and floating plants on sand, gravel or soil media for human use and benefits. In this study, the performance efficiency of emergent plants in subsurface flow constructed wetland for treating tannery wastewater was evaluated using six locally available selected plant species such as, Cyperus papyrus, Typha domingensis, Cyperus alopcuroides, Schenoplectus corymbosus, Sesbania sesban, Aeschynomene elaphroxylon. The seventh cell was unplanted and used as a control. The treatment performances of each cell were assessed for selected parameters such as, BOD5, COD, TSS, TN, NO3-, NH4+, sulfide, sulfate, total chromium, TDS and electrical conductivity. High removal efficiency for total Cr (98.4%), COD (68.7%) and sulfide (59.2%) was observed in cell planted with Schenoplectus corymbosus. Whereas cell planted with Sesbania sesban showed high removal efficiency for sulfate (96.3%), BOD5 (84.7%) and TN (58.3%), while cell planted with Cyperus papyrus showed higher removal efficiency for NO3- (73.2%) and NH4+ (26.2%). In addition, cell planted with Typha domingensis showed good removal efficiency for BOD5 (84.2%), NO3- (69.1%), COD (57.9%), TN (53.2%), and NH4+ (21.1%). Generally, with six months of operation, cell planted with Schenoplectus corymbosus, Cyperus alopcuroides Typha domingensis and Sesbania sesban showed high removal efficiency for the selected parameters indicating that these plants are a potential candidate for large scale tannery wastewater treatment. However, evaluation of the system over longer period is required before concluding whether these plants in subsurface constructed wetland are efficient for primary treatment of tannery wastewater.
| Item Type: | Thesis (Masters) |
|---|---|
| Uncontrolled Keywords: | Constructed wetland; wetland plants; wastewater treatment |
| Subjects: | G Geography. Anthropology. Recreation > GE Environmental Sciences Q Science > Q Science (General) Q Science > QK Botany T Technology > T Technology (General) T Technology > TD Environmental technology. Sanitary engineering |
| Divisions: | Africana |
| Depositing User: | Selom Ghislain |
| Date Deposited: | 24 Aug 2018 13:01 |
| Last Modified: | 24 Aug 2018 13:01 |
| URI: | http://thesisbank.jhia.ac.ke/id/eprint/4850 |
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