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Sustainable Wastewater Treatment: Indicators and Technologies

Nouri Goukeh, Mojtaba | 2019

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 51960 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Abrishamchi, Ahmad; Dansh-Yazdi, Mohammad
  7. Abstract:
  8. An increase of wastewater treatment plants and wastewater treatments methods have increased the importance of selection of best wastewater treatment alternative. This selection should not be merely based on the quality of effluent, but the whole factors (economic, environmental, technical and social factor) should be considered. Different methods for the assessment of wastewater treatment plants is used. For example, life cycle assessment is used for the evaluation of environmental impacts or cost-benefit analysis are used for economic analysis. But, for selection of the most sustainable technology whole factors should be evaluated together. Multi-criteria decision-making methods can be utilized in this kind of issues.In this study, in the first step, appropriate criteria and indicators for comparison of different wastewater treatment technologies were determined. Then, with using from analytic hierarchy process, fuzzy analytic hierarchy process, The Technique for Order of Preference by Similarity to Ideal Solution (TOPSIS) the ranking of alternatives based on criteria and indicators were determined. Based on these methods, sequencing batch reactor (SBR) and activated sludge (AS) earned maximum grades (in AHP, 0.231 and 0.217). Besides, sensitivity analyses showed that grades of wastewater treatment alternatives are more sensitive to environmental and economic criteria than social and technical criteria. In small communities, technologies of wastewater treatments and weight of criteria and indicators for small communities are different from towns and cities, thus in this study ranking of wastewater treatment alternative for small communities were evaluated independently. Multi-criteria decision-making methods that were used in this study showed that pond and constructed wetlands earned maximum grades (in AHP, 0.221 and 0.198). Besides, sensitivity analyses showed that the ranking of wastewater treatment alternatives are not strongly sensitive to weights of criteria and only with the increase of weight of environmental criterion to more than 48 percent, membrane bioreactor would earn the first rank in small communities
  9. Keywords:
  10. Sustainability Assessment ; Waste Treatment ; Index ; Multicriteria Decision Making ; Activated Sludge ; Fuzzy Hierarchical Analysis

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