Integrated Wastewater and Waste Heat Recovery System in Coal-Fired Power Plants Using Reverse Osmosis to Produce Clean Water and Increase Thermal Efficiency

Indonesian electricity supply is still dominated by coal-fired power plants (CPP) more than 50%. Water consumption for CPP in Indonesia reaches 222 million kL/year. Meanwhile, 10% of Indonesia's population predicted to experience a clean water crisis 2045. Most the consumed will be disposed as wastewater, such cooling tower blowdown and boiler blowdown. Boiler temperature relatively high. Thus, it wastes high-quality energy. Therefore, these conditions open opportunity innovations improving increasing CPP’s thermal efficiency. In this research, novel system that integrates wastewater recovery waste heat using reverse osmosis proposed produce while system, streamed exchanger feedwater preheater. Then, flows Pelton turbine generate electricity. The then mixed with water. brine converted an electrolyzer into NaClO H2. Thermodynamic economic analyses are performed assess system’s technical feasibility. Based on thermodynamic analysis calculation Engineering Equation Solver, able 162 kL/hr efficiency plant increases 0.4%. showed additional feasible payback period 4.9 years.