An advanced filtration technique for reusing greywater is a critical and essential procedure for solving water scarcity and meeting the rising demand for clean water in densely populated and urban areas. Greywater or wastewater from washing machines, sinks, and baths can be safely reused for non-potable purposes such as toilet flushing and irrigation when properly treated. The major problems lie in the variable quality of greywater, which may contain pathogens, organic matter, oil, and detergents, making treatment difficult. Traditional filtration models often fail to simultaneously and consistently meet safety standards; therefore, we designed a circular intuitionistic symmetry point of criterion technique with a circular intuitionistic fuzzy rank-sum model for evaluating a multi-attributive ideal real comparative assessment (MAIRCA) model based on Sugeno–Weber aggregation operators. In this study, we found that the most valuable and essential indicators for valuing the advanced filtration techniques are the benefits of greywater, like membrane filtration, activated carbon filtration, advanced oxidation processes, constructed wetlands, and ultraviolet disinfection. To this end, we present some numerical examples of performance evaluation and compare the proposed ranking framework with existing methods to demonstrate the supremacy of the proposed method.
Ali et al. (Wed,) studied this question.