Some errors have been discovered in the course of the experiment, such as purity of the system, balance and glassware, instrument faults, dirty apparatus, timer misreadings and poor weighting. Viewing the overall experiment results, the removal rate percentage is acceptable and the 60% suspended solids removal is below 50 min. It is shown that the settling test varied subject to the overflow rate, velocity gradients in the system, concentration of particles, depth of the column, and range of particle sizes .
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