The lavatory waste in a boat is led to a septic tank which is emptied at a pumpout station. By using these stations it is possible to ensure that the waste will end up in wastewater treatment plants instead of the natural waters where it causes eutrophication.
The lavatory waste of boaters causes point source pollution, especially in marinas and shallow bays. Urine is rich in nitrogen and phosphorus, and the containing nutrients are present in a form that can be easily utilized by cyanobacteria (“blue-green algae”), algae and plants. Feces contains less nutrients but it can spread bacteria causing a health risk especially in shallow waters during the warm summertime.
Here we present the available technology used for the disposal of sewage from leisure boats.
KEEPING AND GETTING BETTER
A fixed station can be located on a pier or on the bank. The wastewater in the fixed station is led to a separate tank or straight into the wastewater system. The pumps are user-friendly for boaters and marina managers.
The precise location of the fixed station should be carefully premeditated before installation. The station must always have space on the side for the user of the facility, mooring should happen rather easily, and the depth should be suitable even for boats with a large draft.
For most of the fixed stations, it is possible to attach a pump for bilge water removal, which naturally increases the price of the station to some extent.
Floating stations are equipped with a large tank which must be occasionally emptied. The advantage of these stations is that they can be anchored further away from the crowded marinas, next to a waterway for example. It is also possible to change their location if necessary.
The cart like, movable pumps that can be carried to the boat are equipped with a tank in which the lavatory waste can temporarily be preserved. The waste must be emptied from these stations in to a larger tank or to the wastewater system. These stations are convenient because it is not necessary to move the boat in order to empty the septic tank. However, the stations require more work if the pump is used frequently.