Reduction of Pollutant from Grey Water Using Modified Hydraulic Structure Case Study: Multi – Layer Cascade Weir

Abstract

The aim of this study is to propose a modified treatment system to remove and reduce the contamination of pollutants found in grey water. A combination of stepped cascade weir and spray aerator which consist of two layers of stepped cascade weir, suspension growth unit, and clarification tank. An experimental system to treat grey water has been constructed during 8 months. The performance of the treatment schemes has been evaluated by monitoring the quality of the raw grey water and effluent for some parameters, which are: Chloride Cl^-, Chemical Oxygen Demand (COD), Biological Oxygen Demand (BOD₅), Iron Fe⁺², and Manganese Mn⁺². The removal efficiencies for grey water pollutants COD, and BOD₅ organic loading was measured which ranged between (51 % to 53 %), while the reduction of Fe⁺², Mn⁺², and Cl^- were (11 %- 23%), (12 %-26 %), and (16 %-24 %)  respectively.

Keywords: grey water, multi-layer cascade weir.