At a 2013 AWWA symposium on biological treatment of drinking water, presentations covered a full spectrum of topics; speakers outlined different processes, dispelled misconceptions, introduced new research, and summarized the regulatory aspect of biotreatment.

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Two methods are in general use for the evaluation of qualities. The paper suggests an alternative technique which may be employed, and advances evidence to show its superiority over the other methods. The practical application of the technique is illustrated by reference to metallurgical problems and to the assessment of the corrosivity of cutting oil emulsions.