CHARACTERIZATION AND POTENTIAL USE OF GREY WATER GENERATED FROM CONDOMINIUM HOUSES AT ARBA MINCH TOWN. A CASE OF BEKELE MOLLA CONDOMINIUM

Abstract

Humans require a safe and sufficient supply of water and sanitation facilities in order to survive. The gap between available water facilities is increasing day by day. Onsite sanitation provision in urban rarely priorities the grey water reuse. Yet it forms largest fraction of wastewater. This study was carried out characterize grey water and potential use of grey water in Bekele Molla Condominiums (Arba Minch Town). Samples were collected for analysis from twenty representative households as well as from four grey water sources for four months. The sum mean grey water generation rate was estimated 16.5 L/c/day, the sum of mean grey water losses was estimated 0.9 L/c/day. The pH concentration of grey water generated by hand washes, kitchen, laundry and shower (8.6, 7.7, 9.4 and 8.4), while the conductivity was (2800, 4015, 4248 and 2733) µS/cm, chemical oxygen demand (COD) was (1593.0, 1813.8, 2244.9, 1718.9) mg/l; biological oxygen demand (BOD5) was (599.2, 586.5, 735.3, 683.8) mg/) and Total hardness (196.3, 232.5, 206.3 and 192.5 mg/l, respectively). Analysis of variance (ANOVA) showed significance difference in the concentration of pH, EC, TSS, Turbidity, TDS, HCO3-, CO3-2 , CaH, Ca2+, Na+ , K, BOD5 COD, F coliform, Oil & Grease, TN, TP and TKN in grey water from hand washes, kitchen, laundry and shower. The 70% of level awareness in condominium community reuse grey water for garden irrigation; toilet flushing and green yard was low. Thus, there is need to priorities the grey water treatment in Bekele Molla condominium houses to achieve adequate sanitation