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Fig. 1. Setup for column experiments. Components include: carboys containing aqueous influent solutions of minimal mineral salts and glucose (1); peristaltic pump (2), drip emitters (3); housing containing ultraviolet lights (4); segmented, 55-cm-long acrylic columns with ring tensiometers, pressure transducers, and TDR probes (5); syringes for dissolved oxygen sampling (6); carboy for collection of waste effluent (7); Tektronix Model 11801 digital sampling oscilloscope (8); and computer with data acquisition board (8).
