Secies Composition of Sulfur Oxidizing and Denitrifying Bacteria from the Tannery Wastewater Treatment Plant, Modjo, Ethiopia
| dc.contributor.advisor | Assefa Fassil (PhD) | |
| dc.contributor.author | Bekele Sissay | |
| dc.date.accessioned | 2018-07-16T13:20:19Z | |
| dc.date.accessioned | 2023-11-08T16:39:08Z | |
| dc.date.available | 2018-07-16T13:20:19Z | |
| dc.date.available | 2023-11-08T16:39:08Z | |
| dc.date.issued | 2000-03 | |
| dc.description.abstract | The discharge of tannery effluents to different water bodies increase pollution because of heavy accumulation of toxic compounds such as sulfur and nitrogen containing organic wastes, chromium, arsenic etc. Thitty-six strains of Sulfur Oxidizing Bacteria (SOB) belonging to sixteen genera were isolated fi'om the three tannery ponds of a Tannery Waste Treatment system at Modjo. They were characterized on the basis of their cultural, morphological, and physiological characters. The genera were Acidiphilium, Acromatium, Macromonas, Sulfolobus, Thermothrix, Thiobacilllls, Thiobacterium, Thiomicrospira, Thiosphaera, Thiospira, Thiovullim Rhodobacfor, Rhodocyclus, Rhodomicrobillm, Rhodopseudomonas, and Rhodosprillllm. Out of these isolates, twenty-one strains falling into twelve genera were capable of denitrification. Bacterial enumeration based on MPN technique showed a population number between 1.2 x 103 and 1.1 x 106 . The number of strains recovered from the different ponds varies such that twenty, sixteen, and nine strains were isolated fi'om AFP, SFP, and MP, respectively. The dominant strains isolated from different pond systems were the genera Thiobacilllls (S strains), Rhodopselldomonas, (4 strains), and Rhodomicrobiulll (3 strains). The most frequently isolated strains in the three different pond systems were Thiobacilllls (AUS9) and Rhodolllicl'obilllll (AU142). Isolated strains showed variation in growth on different media and some such as Acidiphiliulll (AUS); Slilfoloblis (AUl2); Thiobacillus (AUS9) Thiolllicrospira (AU62); Thiosphaera (AUS7) Rhodolllicl'obilllll (AUl42, AU164, AUl76) failed to grow on denitrifYing medium but were capable of growing on nitrogen free (nit) medium. Most of the isolates were found to be slow growers reaching to their exponential stage between 4S-72 hours. In their spatial distribution, the anaerobic strains in AFP system and the aerobic isolates in the SFP and MP systems were found to be dominant. | en_US |
| dc.identifier.uri | http://etd.aau.edu.et/handle/123456789/8809 | |
| dc.language.iso | en | en_US |
| dc.publisher | Addis Ababa Universty | en_US |
| dc.subject | Oxidizing and Denitrifying Bacteria | en_US |
| dc.title | Secies Composition of Sulfur Oxidizing and Denitrifying Bacteria from the Tannery Wastewater Treatment Plant, Modjo, Ethiopia | en_US |
| dc.type | Thesis | en_US |