Download Characterization Treatment of Omani Greywater for Removal of

Civil and Architectural Engineering Department-College of Engineering-Sultan Qaboos University
Characterization Treatment of Omani Greywater for Removal of
Organics and Suspended Solids Using Bench-Scale Sequencing Batch
Reactor Technology
Ali Hamed AL Harrasi
Abstract
This study aims to evaluate the potential of greywater availability and its quality in Muscat
Governorate, Sultanate of Oman in order to assess the reuse options. The main objectives is to
evaluate the applicability of sequencing batch reactor (SBR) process in treatment of greywater
and to investigate the effect of cycle time on the sequencing batch .....
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reactsr
(SBR)
treatment of am ani greywater. The greywater production is approximately c-" 81 % of the fresh
water consumption (140LlCapitaJDay) and most of the greywater is generated from showers.
Greywater samples were collected from showers, laundries, kitchens and sinks from different
houses and analyzed for water quality parameters, which suggested that greywater contains
significant levels of suspended solids, inorganic constituents, total organic carbon, chemical
oxygen demand (COD), Biochemical oxygen demand (BOD), total Coliforms and Escherichia
Coliform bacteria. A pilot scale sequencing batch reactor (SBR) was operated to study the
organic removal of greywater. Experiments were run for cycle time of 3hrs, 4hrs, 5hrs, 6hrs and
7hrs. In all experiments, the react phase period was 1.5 times the fill phase period. Experimental
results showed that the highest COD and suspended solids (SS) removal for the treatment of
greywater using SBR technology were obtained with react period of 3 hour and duration of fill
phase of 2 hours. Removal percentage ranged between 50% to 83% for COD and 90% to 100%
for SS. Survey was carried out to assess the public interest in treated greywater reuse. Results
indicated that 87% of the people accepted greywater reuse for gardening, car washing, toilet
flushing and potable purposes whereas 5.3% opposed reuse of greywater due to possible health
hazards, environment and groundwater pollution, religious beliefs--and .economical feasibility.