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33. ...or stirred in
from the top by aerators. |
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34. Finally, any remaining
solid bits are left to sink to the bottom of a tank and the effluent will flow out. |
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35. The treated wastewater (effluent) is now safe to be released into rivers, lakes and seas. But what's left is the sludge which needs to be dried by pressing, drying or burning. |
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36. Sludge is also an excellent soil conditioner for ornamental plants. |
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37. If you have a septic tank in your garden, this is what happens. Sewage goes around
the S-bend into the septic tank. The solid matter settles down onto
the bottom of the tank and the liquid overflows into a monsoon drain.
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38. A septic tank must be desludged regularly to prevent:
- excessive build-up in the tank
- overflow
- blockages
- loss of tank capacity
Through desludging is also vital in order to avoid pollution of our waterways and the environment.
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