Sequencing batch reactor foam separation

To start the SBR foam separation (or dispersed air flotation, or induced air flotation) experiments, sufficient volume of raw water is adjusted to the desired pH with 1.0 A sodium hydroxide or 1.0 A sulfuric acid, an appropriate amount of surfactant is added to the raw water, and the ntixture is poured into the Foamer Tester (Fig. 7). Compressed air is then diffused through the liquid ntixture by means of a plastic cloth grid (Fig. 8). Foam is withdrawn from the top and collected in a container. The run is allowed to proceed until no additional foam is formed. A sample of the bulk liquid near the reactor bottom is analyzed for pH, color, turbidity, and other water quality parameters. The foam is collapsed in a beaker and its volume is measured. 

From batch foam separation experiments, one may be able to determine the feasibility of the process and the approximate optimum chemical dosages. 

For the continuous foam separation study, sample solution is prepared, mixed well, and placed in the large feed tank. Four liters of initial sample are taken with the desired amount of collector added, the iititial color, turbidity, optical density, surfactant concentration, streaming current reading, conductivity, and pH are determined. The collector is also uniformly prepared and placed in a smaller feed tank. The solutions of influent feed 

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