The Moos KSA-system and the polymers used for ... - Simon Moos A/S

1. About the KSA system
The KSA-system is built in a container which is separated in several rooms of various sizes.
In the following the KSA-system is described with a view to the processes taking place during
the cleaning of the water.
- The contents of the septic tank is sucked into the vacuum tank. During this process the
sludge is homogenized. A further homogenizing of the sludge can take place in the
vacuum tank by means of a strong air flow.
- The homogenized contents of the vacuum tank is pumped into the dewatering tank and
during this process polymer in exact quantities is added. The polymer solution (max.
0,5% w/w solution) is stored in the polymer tank, which contains a stirring device. The
quantity of the polymer is dosed by means of an adjustable dosing pump. The amount of
polymer to be dosed is estimated by means of both visual and physical methods made by
a test sample drawn from the test cock.
- The testing is important because if the dosing is too high or too low the result of the
dewatering will be bad. Furthermore a dosing which is too high will be uneconomical
because of the higher consumption of polymer and the extra cleaning of the dewatering
filters.
Polymer and sludge is mixed thoroughly resulting in the best possible dewatering.
The adding of polymer results in coagulation of the sludge particles and in a separation of
water and particles. The water runs through the dewatering filters (size of the mesh is
7ooFm) and runs to the rejectwater tank. During the dewatering process no pressure,
compression or vacuum takes place, and because of this the rejectwater is extremely clean
in comparison with rejectwater obtained from other dewatering systems.
- The septic tank is filled with the rejectwater resulting from the dewatering process, this
preserves the biological activity in the septic tank. The rejectwater which is going back
originates from the septic tank which has just been emptied. If small polymer residues
remains in the reject water they will bind with the sludge particles always remaining in
the septic tank. In this way it is ensured, that the polymer will not be let out in the
receipient.
- After emptying, dewatering and returning of the cleaned water the process can be
repeated with a new septic tank.
- When the working day has ended the dewatered sludge can be emptied in an approved
depositing place (an approved dump site or an waste water treatment plant)
The advantage of the KSA-system is that septic sludge can be treated individually (depending on
the condition of the sludge) by changing the type and the amount of polymer. The system will
furthermore homogenize the sludge which makes it easier to dose it with the correct amount of
polymer. Furthermore the system makes it possible to empty septic tanks all day long without
having to empty the system. In this way transport time and fuel consumption is reduced. All