Abstract:
Labuduwa farm, Galle is one of the major vegetables and meat supplier to the local
residence in the Galle area. Also, Sri Lankan sweets produced by the farm have a
high demand among the customers. For all cultivations and food processing works
the farm uses water from a well and the town water supply system. At present,
about 15 m3 waste water accumulates daily at the farm and there is no any method to
reuse this water except dispose to the environment creating many environmental
problems for residence around the area.
Understanding the present situation in the farm, this study proposed a waste water
treatment plant considering a budgetary allocation provided by the Southern
Provincial Council, hi the design procedure, samples of the waste water were
collected at different time intervals during daytime and the samples were tested at
the Environmental Engineering Laboratory, Faculty of Engineering for finding
microbiological, physical and chemical parameters such as BOD, COD, pH, TSS and
TDS. Considering the laboratory results and the rate of accumulation of waste
water, this study selected the SBR (Sequencing Batch Reactor) method to treat the
raw waste water. The size of the batch reactor was calculated by the procedure
explained in the literature with the use of parameters obtained in the laboratory
tests.