Hassimi Abu Hasan's research focuses on water and wastewater treatment and resource recovery (WAT3R), integrating sustainable technologies such as coagulation/flocculation, biofilms, phytoremediation, and phycoremediation to improve water quality. His work in pollutant reduction, nutrient recovery, water reuse and recycling, and bioproduct generation plays a crucial role in advancing the industrial economy and community well-being. By enhancing wastewater treatment efficiency and promoting the recovery of valuable resources like nutrients and bio-based products, his research supports industries such as agriculture, biotechnology, and manufacturing, reducing environmental pollution and lowering operational costs. Moreover, access to clean treated water benefits public health, reduces water scarcity, and enhances quality of life, fostering sustainable urban and rural development. This research aligns with national economic growth strategies, enabling eco-friendly industrial expansion while ensuring environmental conservation and public welfare 

The industrial process involves the consumption of raw materials, water, and energy to produce goods, but it also generates various waste streams, including gas emissions, wastewater, and solid waste. Through a circular economy approach, these waste materials are not discarded but instead recycled, reused, or recovered to maximize resource efficiency. Wastewater undergoes treatment to be reclaimed as clean water for industrial reuse, while solid waste is processed to extract valuable secondary products. Gas emissions can be captured and converted into energy, further reducing environmental impact. By integrating these circular solutions, industries can reduce environmental pollution, lower operational costs, and enhance economic resilience, ultimately benefiting both industrial development and community well-being.