The pH in Pond #2 was acidic, in the range 4.1–4.3.
Under this condition, methanogenesis cannot occur, as
this condition is highly unfavorable for the growth of
methanogenic bacteria (Duarte and Anderson, 1982).
This is further brought out by the fact that BOD5 removal
in Pond #2 was less than 10%. However, in Ponds
#4 and #5, the pH was between 6 and 8 as these ponds
were active anaerobically. In fact, intense biological
activity was observed in these two ponds as evidenced by
formation of excessive gas bubbles and the existence of
floating sludge on the pond surface. According to
Zehnder et al. (1982), the optimum pH range for all
methanogenic bacteria is between 6.0 and 8.0, but the
optimum value for the group as a whole is close to 7.0.
Van Haandel and Lettinga (1994) reported the same
observation.
The pH in Pond #2 was acidic, in the range 4.1–4.3.
Under this condition, methanogenesis cannot occur, as
this condition is highly unfavorable for the growth of
methanogenic bacteria (Duarte and Anderson, 1982).
This is further brought out by the fact that BOD5 removal
in Pond #2 was less than 10%. However, in Ponds
#4 and #5, the pH was between 6 and 8 as these ponds
were active anaerobically. In fact, intense biological
activity was observed in these two ponds as evidenced by
formation of excessive gas bubbles and the existence of
floating sludge on the pond surface. According to
Zehnder et al. (1982), the optimum pH range for all
methanogenic bacteria is between 6.0 and 8.0, but the
optimum value for the group as a whole is close to 7.0.
Van Haandel and Lettinga (1994) reported the same
observation.
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