Waste stabilization pond is a simple scientifically designed pond with 2-6 feet depth, where natural purification and stabilization of wastewater is accelerated by supporting algal-bacterial growth. The bacteria grown in the stabilization pond decompose the biodegradable organic matter and release carbon dioxide, ammonia and nitrates. These are utilized by the algae which together with sunlight and photosynthetic process release oxygen, then breakdown waste and accomplish reduction of BOD levels in the sewage. Waste stabilization pond is considered as the secondary (biological) treatment...