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From the data acquired and our direct observations, we conclude that the optimal flow rate of this flocculator and sedimentation tank performance of the Demo Plant improves with lower plant flow. The performance limit of the plant is approximately 50 mL/min, below which there is no decrease in effluent turbidity.
The empirical optimal plant flow . This is much lower than the 100 mL/min design flow rate. This is most likely due to slight inaccuracies in construction of the sedimentation tank that caused the flow rates in each of the lamellas to be different, resulting in a settling time that was lower than expected. Thus, when plant flow rate was decreased, resulting in a longer settling time, the flocs had a more reasonable adequate amount of time to settle out, and effluent turbidity decreased.