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Evaluation of wastewater treatment technologies using TOPSIS

The selection of appropriate wastewater treatment technology is now an important issue before any wastewater treatment plant is designed or implemented. Population growth, urbanization, industrialization, and numerous other factors are needed before such implementation and decision making, as all these factors are increasing the number of pollutants entering our waterways and into our environment, which needs to be treated prior to discharge. TOPSIS, a widely used compensatory multi-criteria decision-making technique, has been selected for ranking and evaluating different wastewater treatment alternatives and this paper will effectively identify the most appropriate process in terms of cost, maintenance, energy use, and more. Choosing the process is becoming more concerning for decision-makers and to overcome this difficulty, TOPSIS is proposed to deal with this vagueness in relation to decision-makers’ judgments. The outcomes of this study will help the concerned parties in choosing the best option among these technologies and will provide an insight for relevant stakeholders such as engineers, town planners and other government personnel for making decisions. The most commonly used wastewater treatment technologies were evaluated and compared with the fuzzy PROMETHEE decision-making theory. Based on this research, the activated sludge process is recommended as the best option, followed by the nano-filtration method.