Constructed wetlands designed as subsurface flow systems are used to keep the water ... to oxygen-lacking water before it flows out of septic tanks. Instead of flowing continuously, like most ...

The school had already been warned several times by the National Environmental Management Authority (NEMA) to treat its wastewater before letting it out to the surrounding environment. The septic ...

Figure 1: Relationship between nitrogen level, hydrologic flow pattern and plant species and bioenergy productivity in constructed wetlands. Figure 2: Comparison of energy input, energy output ...