ABSTRACT
This chapter deals with the analysis and discussion of experimental results of parameters measured on the steady stage. The stage parameters consists of biochemical oxygen demand (BOD), chemical oxygen demand, total suspended solids, ammonia, phosphate, dissolved oxygen, fecal coliforms and some of heavy metals as Zinc, Iron, Manganese, Lead and Cadmium. The three used media (plastic, gravel, and rubber) in treating the influent primary treated wastewaters are compared. Two main factors affecting the treatment performance; the first one is the effect of constructed wetland cell length and the second factor is the effect of discharge variation. In the steady stage, different sewage loads were applied to the wetland cells in order to study the effects of changing retention time and loads on treatment. The effluent BOD concentration was studied with distance from cell inlet, loading rate, and influent concentration. The variation of BOD removal efficiency with distance, retention time, and discharge was also determined.
