Photoautotrophic Chemoautotrophic Heterotrophic:
Light Carbon dioxide
Inorganic oxidation-reduction reactions Carbon dioxide
Light Organic carbon
Organic oxidation-reduction reactions Organic carbon
Source: Adapted from Metcalf and Eddy, Inc., 1991, Wastewater engineering: Treatment, disposal, and reuse, 3d ed., (New York: McGraw-Hill).
ganism to the next, but they fall within one of the following three categories: (1) amino acids, (2) purines and pyrimidines, and (3) vitamins (Metcalf and Eddy, Inc. 1991).
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