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The indigo used in dyeing jeans is difficult to remove from the wastewater due to the recalcitrant nature of the dye. Therefore, denim dye wastewater treatment is considered key to maintaining the sustainability of the textile industry. This project demonstrates a biological post-treatment method to remove indigo blue in wastewater from denim factories by using sunlight and macroalgae species. The dye in the wastewater is broken down by the enzymes produced in the metabolism of the macroalgae species such as Cladophora and Chaetomorpha for dye biodegradation. This biological dye removal system also helps consume the carbon dioxide waste gas emitted from the denim factory, leading to a more active process of capturing carbon dioxide and contributing to a cost-effective, energy-efficient and eco-friendly solution for the reduction of wastewater dye pollutants from denim factories.