04/06/2026
⚙️ How does a wastewater plant remove nitrogen AND phosphorus at the same time? Meet the AAO process. 🌿
Treating wastewater isn't a single step — it's a carefully choreographed sequence of biological reactions. And the AAO process is one of the smartest designs the industry has ever developed.
AAO stands for Anaerobic – Anoxic – Oxic.
Wastewater passes through all three zones in sequence, and each zone has a completely different job to do.
Here's the genius of it:
🟤 Anaerobic zone — Special bacteria release phosphorus here, storing up energy for later. Think of it as "charging up."
🔵 Anoxic zone — Bacteria use nitrogen compounds instead of oxygen to breathe, converting harmful nitrates into harmless nitrogen gas that escapes into the air.
🟢 Oxic zone — With plenty of oxygen, bacteria break down organic matter, convert ammonia to nitrate, AND those same phosphorus bacteria from earlier now soak up phosphorus in large amounts.
The result? One compact system that handles everything:
✅ COD removal ≥ 85%
✅ Ammonia removal ≥ 90%
✅ Total nitrogen removal ≥ 85%
✅ Total phosphorus removal ≥ 90%
This is the technology behind many of the municipal wastewater plants keeping our rivers clean every single day. 🌊
Share this if you found it fascinating! 💙
#环保 #污水处理
