Table 37-1. Factors affecting biological oxidation.
| Food, BOD | To maintain control with efficient BOD removal, the proper amount of food must be supplied. |
| Dissolved oxygen | Insufficient oxygen levels inhibit BOD removal |
| pH/toxicants | With time, bacteria adapt to changes in conditions. Rapid changes in pH or type of waste organic inhibit the process. |
| Time | The degree of degradation varies with time. |
| Nutrients | Bacteria require trace amounts of ntirogen and phosphorus for cell maintenance. |
| Temperature | Low temperatures slow reaction rates; higher temperatures kill many strains of bacteria. |