Waste Stabilization Pond Systems

Waste stabilization systems comprise a single series of anaerobic, facultative and maturation ponds, or several 125 such series in parallel. Anaerobic and facultative ponds are designed for removal of biochemical oxygen demand (BOD) and maturation ponds for pathogen removal. How-ever, some BOD removal also occurs in maturation ponds and some pathogen removal in anaerobic and facultative ponds. Anaerobic and facultative ponds only are re-quired when the treated wastewater is to be used for restricted crop irrigation and fish pond fertilization, and a relatively weak wastewater (up to 150 mg BOD/l) is to be treated prior to surface water discharge. Maturation 135 ponds are required only when the treated wastewater is to be used for unrestricted irrigation and when stronger wastewaters (BOD > 150 mg/l) are to be treated prior to surface water discharge

1. Suspended solids reduction is somewhat low due to possible overflow of algae.

2. Coliform reduction can be up to 6 units.

3. Total Nitrogen removal between 70-90%.

4. Can reliably produce high quality effluent with low BOD, SS, Faecal coliform and high D.O.levels

5. BOD reduction of the order of 90% or so..

6. Total Phosphorus removal .

7. Between 30-45%.

8. Detention time: 6 to 8 days.