Rapid Method for Determining Numbers of Sewage Pollution Bacteria, e.g., Coliforms,in Water,

摘要

The primary objective of this research was to invent a test for the presence of sewage pollution bacteria,such as coliform bacteria,in drinking water and wastewaters which would shorten the period of the test to 6hours or less. The present standard method requires 20-24hours. The reduced time period would make it feasible to hold drinking water in storage long enough to obtain the test results before releasing the water for use. The basic technique expected to produce the reduction in time was to be the use of an impedance instrument for the measurement of growth of sewage indicator bacteria in differentiating culture medium. Impedance is defined in this case as resistance to the flow of alternating current,in this case,through a liquid.