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| dc.contributor.author | E MELAKU, AMAR | |
| dc.date.accessioned | 2020-03-11T13:00:05Z | |
| dc.date.available | 2020-03-11T13:00:05Z | |
| dc.date.issued | 2020-03-11 | |
| dc.identifier.uri | http://hdl.handle.net/123456789/10260 | |
| dc.description.abstract | The treatment of textile wastewater sludge results in the production of large amounts of sludge. Compared to landfilling and incineration, utilization of sludge as fertilizer is a more sustainable treatment because it recycles both nutrients and organic matter. However, the presence of heavy metals in sludge prevents the use of sludge as fertilizer. The removal of heavy metals from the sludge is therefore a necessary step to achieve a more sustainable sludge treatment. In this thesis work, sludge samples were collected from Bahir Dar textile Share Company and were analyzed physico-chemical parameters including heavy metals. The concentrations of metal ions were measured by atomic absorption spectrum (AAS). Afterward, the sludge was treated using citric acid extraction method to remove heavy metals in particular Cr and Zn which are present in textile sludge in potentially to be used for agriculture purpose. A 5.0 g of textile sludge were filled with 100 ml of distilled water followed by the acid addition. The concentration of the acid used was in the range of PH 3-7 at room temperatures 25°C and the contact times ranged from 0.08 to 12 day. Moreover, economic and environmental feasibility of heavy metal removal methods were evaluated by using multi criteria analysis method. The data analysis for acid extraction experiment was based on graphical interpretation through factorial ANOVA using Minitab and for the selection of best heavy metal removal technology was based on Analytical hierarchy process (AHP) excels software. The results revealed that textile sludge contains nitrogen, phosphorus and potassium in the percentage of 2.236%, 0.948%, and 0.095% respectively. The optimum acid extraction was achieved when the sludge samples were in contact with citric acid (C6H8O7) at PH3, after 6 day reaction time at room temperature of 25°C. Experimental conditions resulted in the highest heavy metal removal efficiency, more specifically 86.1% for Cr and for Zn 79.8%. The ranking order of the alternatives in AHP method is Chemical leaching by citric acid > Bioleaching > Electro kinetic removal > Supercritical fluid extraction. Based on a brief technical, environmental, applicability and economical evaluation, citric acid is more attractive method. | en_US |
| dc.language.iso | en | en_US |
| dc.subject | Environmental Engineeringin | en_US |
| dc.title | REMOVAL OF HEAVY METAL FROM TEXTILE EFFLUENT SLUDGE USING CITRIC ACID EXTRACTION METHOD IN CASE OF BAHIRDAR TEXTILE SHARE FACTORY | en_US |
| dc.type | Video | en_US |
