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Abstract
Municipal wastewater separation into blackwater and greywater proved to be an efficient system to prevent the contamination of greywater, reduce the volume of faecal contaminated wastewater as well as reducing the cost of treatment. This study concentrates on sand filter as a secondary treatment step for the treatment of the primary sedimentation effluent. During the study period, the system operated with an influent flow rate of 86 l/mvday. The corresponding organic loading rate was 23.74 g BaD /m2/day. Removal of 90.6%, 91.2%, 85.3% and 68.6% for COD, BaD, TSS and oil & grease was achieved. On the other hand using up-flow anaerobic sludge blanket UASB wetland combined system as another option for greywater and blackwater. UASB proved to be a cost effective pretreatment system for wastewater for being simple operated and low energy consumption. As well as, constructed wetlands (CW) offer a low-cost alternative for wastewater treatment in developing countries, particularly in the arid and semi-arid areas. Two separate UASB reactors were used as a primary
treatment step followed by constructed wetland for the treatment of
blackwater and greywater. The hydraulic residence time (HRT) of UASB was kept constant at 6 and 24 hrs for the two reactors respectively, while the organic loading rates (OLR) were 1.88 and 1.16 kg/rrr’zday for the treatment of blackwater and greywater, respectively. The removal efficiency of COD in the UASB reactor was about 54.9% for greywater and 52.9% for blackwater. As well as the removal efficiency of COD, BaD, and TSS were 89.5%, 88%, and 81.9%, respectively for greywater final effluent, 94.2%, 89.5%, and 91.3%, respectively for blackwater final effluent. The final effluent was found to be complying with the National Regulatory Standards for the treated effluent reuse.