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An Aerobic-Anaerobic Interactive System for Soil Suspensions¹

ABSTRACT

A system was developed that allows for the simultaneous batch study of aerobic and anaerobic soil suspensions. It is a modification of earlier systems that allowed for the investigation of homogeneous suspensions at desired oxidative-reduction potentials. This system allows for the contents of aerobic and anaerobic reaction vats to be mixed at desired proportions by using a peristaltic pump connecting the two systems. A desktop computer-based data acquisition system is used to control the pumping time and to monitor the redox potential in the respective vats. By using the HP 9825 calculator and the HP-IB bus, one can program the pumping, based on time, Eh readings, or other monitorable parameters. Gas samples taken from the air space of each unit permits one to study biological and chemical processes as they are affected by interaction of components from aerobic and anaerobic suspensions.

¹ Contribution of the USDA-SEA-AR, in cooperation with the South Carolina Exp. Stn.

² Soil Scientist, Soil Scientist, Mathematician, Soil Scientist, respectively, USDA-SEA-AR, Coastal Plains Soil and Water Conservation Research Center, Florence, SC 29502.

Received for publication January 21, 1980. Accepted for publication August 22, 1980.