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The wider tube settlers, as expected, provided more sensitive data. That is, the effluent turbidity was directly impacted by changes in flow rate, floc blanket height, and tube diameter. The table and graph below illustrate the average effluent turbidity for the three diameters described in the methods section above.
Table 2. Results
As the results show, the second lowest capture velocity for each diameter tube resulted in the optimum settling efficiency at the low floc blanket height. The results also show a general trend of increasing effluent turbidity once the capture velocity exceeds 11.0 m/day. This indicates that the current capture velocity design to in the current plants is appropriate.
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