The PWTech Hybrid Biological Nutrient Removal (HBNR) process is a widely utilized technology for treating wastewater to a very high standard, particularly when stringent nutrients requirements are in force. Combining the performance advantages of continuous flow aerobic/anoxic reactors and the cost-simplicity benefits of sequencing batch reactors (SBRs), the HBNR process offers dependable and stable performance with minimal operator requirements. Smart design makes the process highly cost effective and minimizes ongoing operating and maintence issues.