After several weeks, the aerobic zone of our
column has nearly disappeared and all of our column is mostly black, indicating
the presence of anaerobic bacteria. We can confirm this from the fact that
almost all the aerobic algae that were at the top of the column have died and
disappeared.
The reason behind this is that by putting a big
sulfate source, anaerobic bacteria have proliferated. They produce H2S,
which is toxic to aerobic bacteria, so we can assume this H2S has
reached the top of the column, causing the algae to die.
We can assume this aerobic zone will disappear
completely in a few days and the only thing left in our column will be anaerobic
bacteria.
I see some purple stuff at the bottom. What are these? What do you think will happen in the column in a month?
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