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This research paper provides a comprehensive review of wastewater treatment methods tailored to the textile industry, focusing on the removal of contaminants, particularly indigo dyes, through environmentally friendly or "green" technologies.The textile industry, particularly in regions like Siricilla, Telangana, India, generates wastewater with low biodegradability, containing persistent pollutants that pose environmental and health risks.The paper synthesizes findings from 72 studies, analyzing the physicochemical properties of textile wastewater, its environmental and health implications, and regulatory standards across various countries.Various treatment approaches, including biological, physicochemical, and advanced oxidation processes, are evaluated for their efficacy in indigo dye removal.Advanced oxidation processes, particularly photocatalysis and Fenton reactions, demonstrate superior colour removal efficiency, achieving up to 95% and 97% removal rates in synthetic and real wastewater samples, respectively.However, the reviewed studies lack of clarity regarding the impact of these green technologies on energy consumption, carbon footprint reduction and waste generation and do not address practical scalability for industrial applications.The paper emphasizes the importance of considering international legislation and regulatory frameworks establishing maximum permissible limits for pollutant discharge.Moving forward, it highlights the critical need for the development and evaluation of innovative sustainable wastewater treatment technologies within a realworld context.Future research should prioritize addressing the identified gaps, particularly regarding the scalability and practical implications of green technologies in the textile industry.
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