The article discusses a method to recycle water and extract valuable resources from household and industrial wastewater. It looks at different types of wastewater and how they can be separated based on what can be recovered. Various technologies are explored for reclaiming water and recovering resources like biogas, phosphorus, and heavy metals. A mathematical model is used to maximize wastewater reclamation and resource recovery, with a case study showing that all wastewater streams can be reused, achieving zero-liquid discharge. The use of simulation and optimization in this field is also discussed.