Alemu, Bejiga Melka (2014) Treatability and Biogas Production Potential of Chrome Line Tannery Effluent before and after Chrome Recovery in Anaerobic Sequential Batch Reactor. Masters thesis, Addis Ababa University.
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Abstract
Evaluation of the Treatability and Biogas Production Potential of Chrome Line Tannery Effluent before and after Chrome Recovery in Anaerobic Sequential Batch Reactor Alemu Bejiga, 2014 Direct discharge of tannery effluent to the surrounding water bodies affects the water quality and further causes reduction and death of aquatic fauna and flora. The effect can be minimized by treatment of tannery effluent prior to discharge to the environment. Biological treatment method is cost effective and environmentally friendly than physicochemical treatment method. The objective of this study was to develop a laboratory scale anaerobic sequence batch reactor and evaluate the treatment efficiency and biogas production potential of chrome tanning effluent at mesophilic (370C±2) system. The study was conducted at five treatments (wastewater containing different concentration of chrome). The treatments (T-1 to T-5) contain chrome concentrations (Cr3+) 185mg/l, 120mg/l, 14mg/l and 6.85mg/l for T-1, T-2, T-3, T-4, and T-5 respectively. The hydraulic retention time of all treatments was three days and five days, the organic loading rate was wide-ranging between 1.49 kg COD/m3/day for T-1 to 1.32 kg COD/m3/day forT-5 throughout the study. The removal efficiency of TS and VS of all treatments were in the range of 52-69% and 58-81%, respectively. The removal efficiency of COD,BOD,TN, NO3-, S-2, SO4-2, PO43- and Cr3+ of all treatments were in the range of 42-62%,41-71%, 31-43%, 31-49%, 40-71%, 41-64%, 48-74% and 30-61% respectively. Chrome recovery was achieved up to 96.3%. The maximum value of biogas at five days hydraulic retention time for (T-1 to T-5), (0.0089, 0.0097, 0.012, 0.027 and 0.034 m3 biogas/kg VS respectively) with methane content 21.1%, 22.7%, 37%, 51.3% and 54.7% was obtained after steady stable state condition. Hence, pretreated chrome tanning effluent with Cr (III) of 6.85mg/l was a potential feedstock for ASBR.
| Item Type: | Thesis (Masters) |
|---|---|
| Uncontrolled Keywords: | Anaerobic sequential batch reactor, Chrome Tanning Effluent, Biogas |
| Subjects: | G Geography. Anthropology. Recreation > GE Environmental Sciences T Technology > T Technology (General) T Technology > TD Environmental technology. Sanitary engineering |
| Divisions: | Africana |
| Depositing User: | Selom Ghislain |
| Date Deposited: | 19 Jun 2018 13:39 |
| Last Modified: | 19 Jun 2018 13:39 |
| URI: | http://thesisbank.jhia.ac.ke/id/eprint/4665 |
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