Smart integration (IOT & AI) and energy-efficient approaches: Zero-liquid discharge systems in pharmaceutical formulation plants

Water scarcity and stringent environmental regulations are emerging challenges in pharmaceutical manufacturing, necessitating sustainable wastewater management solutions. Zero Liquid Discharge systems offer complete water recovery; however conventional ZLD processes often energy-intensive and operationally complex. This review critically examines the evolution of ZLD systems in the pharmaceutical sectors with a focus on recent advancements in process optimization and digital integration. The adoption of Industry 4.0 technologies including of Internet of Things and Artificial Intelligence has demonstrated significant potential to enhance system performance through real time monitoring, predictive maintenance and adaptive process control. Evidences from pilot scale studies and industrial case reports indicates AI-assisted optimization can reduced energy consumption by 20-30% improve water recovery efficiency beyond 90-95% and lower operational costs. Emerging membrane-based technologies, like forward osmosis and membrane distillation show improved energy efficiency compared to traditional thermal methods. Although life cycle assessments highlight energy use as major environmental concern, optimized systems can reduced overall impacts. Challenges remain, including high capital cost, system complexity, data dependency and integration constraints. A multi-criteria assessment framework is proposed to support informed decision making. Overall, digitally enabled ZLD systems offer strong potential for sustainable pharmaceutical wastewater management, through further scalable and region-specific validation is required.