Sewage Treatment System In Ship

Federal law requires that cruise ships only dump treated wastewater if they are within three nautical miles of shore.

Sewage treatment system in ship.

While the system used to perform sewage treatment is called sewage treatment plant. Such antiquated treatment systems leave harmful levels of fecal matter bacteria heavy metals and other contaminants in the water foe noted. But beyond that point it s essentially a free for all. The biological vacuum sewage treatment plant is fully automatic in normal operation and they require low maintenance these plants are designed to fulfill the requirements of imo marpol 73 78 annex iv and uscg 33 cfr part 159 for inspected vessels which specify discharged waste water from sewage treatment plants.

A sewage treatment plant on ship consists of a screen filter primary chamber aeration chamber demisters blowers settlement and chlorination chamber. Sewage systems ship service systems the exact amount of sewage and waste water flow generated on board ship is difficult to quantify. The regulation says the discharge of sewage into the sea is prohibited except when the ship has in operation an approved sewage treatment plant or when the ship is discharging comminuted and disinfected sewage using an approved system at a distance of more than three nautical miles from the nearest land. European designers tend to work on the basis of 70 litres person day of toilet waste including flushing water and about 130 150 litres person day of washing water including baths laundries etc.

Sewage treatment is the process of removing contaminants from municipal wastewater containing mainly household sewage plus some industrial wastewater physical chemical and biological processes are used to remove contaminants and produce treated wastewater or treated effluent that is safe enough for release into the environment a by product of sewage treatment is a semi solid waste or. Together they treat and discharge waste to comply with marpol regulation iv. The revised annex applies to ships engaged in international voyages of 400 gross tonnage and above or which are certified to carry more than 15 persons. For example a sewage treatment plant for a 12 passenger ship trading in the baltic sea is given similar total nitrogen limits as that of a municipal wastewater treatment plant serving 10 000.

It is said that waste management on board ship is technically a full time job for the ship s crew. What are the different types of sewage treatments plants that are used and why the treatment of sewage so important before disposing it off to the sea. This article deals with the working of a sewage treatment plant on board a ship.