b)The water treatment plant is estimated to treat about 17, 000 m³/day of water. Due to cost and land limitation, the developer decided to have only 2 unit of sedimentation tank with 3.5 m depth, length and width ratio at 3:1. The sedimentation tank is required to have an overflow rate of 22 m/d. State your assumption if applicable. i) Propose size of sedimentation tank for the treatment plant. ii) Calculate the hydraulic retention time of the tank. iii) Estimate the percentage of removal for suspended solid and BOD5. iv) State TWO (2) the effect of suspended solid on river body if the wastewater is notproperly treated.

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