18/02/2015 Procedure for Starting and Stopping of Sewage Treatment Plant on a Ship

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Procedure for Starting and Stopping ofSewage Treatment Plant on a Ship

OCTOBER 24, 2010 BY MOHIT

Any machine on the ship requires a proper procedure to be followed for starting and stopping it.Failure to follow this step­by­step procedure will lead to either failure in starting or stopping themachine or lead to some fault.

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18/02/2015 Procedure for Starting and Stopping of Sewage Treatment Plant on a Ship

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Sewage treatment plant is one such equipment on the ship which requires a step­by­stepprocedure to be followed for starting and stopping it. In this article we will go through the procedureof starting and stopping a sewage treatment plant.

Starting of a Sewage Plant

Sewage plant is generally running all the time during sailing, but it might need to be started whenthe ship is installed with a new sewage treat plant which needs to be stopped at regular interval oftime for improving its performance and maintenance procedures. Below are the points that need tobe followed for starting a sewage treatment plant.

1. Make sure if any maintenance is carried out on the sewage treatment system, all the openingshave been closed properly before starting.

2. The sewage plant is be filled with fresh water inside the chamber.

3. At this stage, there are no aerobic bacteria inside the chamber, but the sewage has startedcoming to the plant. Thus, in order to increase efficiency and starting rate of the plant bio pac isadded to the plant by flushing the amount specified in the manual. This bio pac is mixed withwarm water which helps in growth of these bacteria and also efficient functioning of the plant.

4. If the bio pac is not added, the plant might take up to 5 to 7 days to be completely functional.However, with the bio pac it becomes functional within 24 hours.

5. Start the air compressor or open the air valve as per the design of the plant. The pressure ismaintained as per the manual. Generally 0.3­0.4 bars.

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18/02/2015 Procedure for Starting and Stopping of Sewage Treatment Plant on a Ship

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6. Open the sewage overboard valve and close holding tank valve when the ship is out ofrestricted waters.

7. The plant is continuously monitored and checked for the flow through the transparent plastictubes.

8. The sample is taken for checking for suspended solids and chlorine content.

Stopping of the plant

Stopping of the sewage treatment plant is generally done either before entering the dry dock or incase some maintenance has to be carried out inside the treatment plant.

1. For stopping the system, close the inlet valve to the sewage plant and close the overboard valveand let the sewage go overboard.

2. Empty all the three chambers of the plant i.e. aeration, settling and chlorination chambers. If thechambers are not emptied, it will lead to growth of anaerobic bacteria which forms the toxic H2Sgas.

3. If entry has to be made inside the tank, the later should be checked for hydrogen sulphide gasH2S with the help of dragor tube by taking a continuous sample from the plant. Entry is made withthe help of mask and rubber gloves should be put on.

18/02/2015 Procedure for Starting and Stopping of Sewage Treatment Plant on a Ship

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4. In case the ship is going to dry dock the overboard should be connected to shore receptionfacilities.

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About MohitMohit Kaushik is a marine engineer sailing with Maersk Shipping. He handles websitedevelopment and technical support at Marine Insight. Apart from handling web developmentprojects, he also manages a logistics company and have a keen interest in modern logistictechnologies .

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18/02/2015 Procedure for Starting and Stopping of Sewage Treatment Plant on a Ship

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