Dispersed Growth
Individual bacterial cells or very small flocs grow in dispersed growth. The specific oxygen uptake rate (SOUR) will aid in determining the source of the dispersed growth.
Extremely rapid growth conditions, such as those seen at startup, can result in dispersed growth. Extremely high SOURs demonstrate this. It is necessary to apply oxidative pressure, which raises the total sludge units and lowers the F/M ratio. Again, reducing wasting and increasing return is usually beneficial to the condition.
Dispersed growth can also be caused by a toxic load. A very low OUR or SOUR indicates this case. After the toxic load has been removed, oxidative pressure is required to increase total sludge units and decrease the food-to-microorganism ratio. As a result, a reduction in wasting and a reduction in return is appropriate. Keep in mind that excessive chlorination of return sludge for bulking control can result in cell dispersion.
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