Ships play a critical role in global trade, but they can also pose serious threats to the marine environment from oil spills, sewage, and other waste. To protect our oceans and coastal waters, international regulations like the International Convention for the Prevention of Pollution from Ships (MARPOL) require vessels to install and operate specific environmental systems.
At the Nigerian Marine Environment Protection Association (NIMEPA), we support the use of these systems to prevent marine pollution and promote responsible maritime operations.
1. Oily Water Separator (OWS)
An Oily Water Separator treats bilge water—contaminated water from the engine room—and removes oil before discharge into the ocean. The system ensures that oil content is reduced to below 15 parts per million (ppm) to comply with MARPOL Annex I requirements.
2. Oil Discharge Monitoring & Control System (ODME)
The ODME continuously monitors and regulates oil and wash water discharged from cargo tanks, especially on tankers. This system ensures ships do not release oil beyond allowed limits and logs key data for compliance and safety.
3. Exhaust Gas Cleaning Systems (Scrubbers)
To reduce harmful air emissions, ships use scrubbers to clean exhaust gases before they enter the atmosphere. These systems help reduce sulphur oxides (SOx) and meet global air pollution limits under MARPOL Annex VI.
4. Sewage Treatment Plants (STP)
Ships generate sewage from onboard toilets and facilities. STPs treat this wastewater using biological and filtration processes before discharge at sea to prevent the release of pathogens and contaminants that can harm marine life.
5. Ballast Water Treatment System (BWTS)
Ballast water can carry invasive species that disrupt local ecosystems. A Ballast Water Treatment System treats this water before discharge, ensuring harmful organisms are removed and global marine biodiversity is protected.
6. Garbage and Waste Management Systems
Ships must manage and reduce onboard solid waste such as plastics and food waste. This includes:
- Incinerators for safe waste combustion
- Compactors and segregated bins for recyclable and non-recyclable waste
- Garbage handling plans to prevent pollution consistent with MARPOL Annex V.
7. Oil Content Meter (OCM)
The Oil Content Meter monitors treated bilge water leaving the OWS to ensure oil concentrations remain within legal limits. If levels exceed the threshold, discharge is stopped, preventing harmful pollution from entering the sea.
Why These Systems Matter
Marine pollution—from oil discharges to untreated sewage—has severe impacts on ocean health, coastal communities, and biodiversity. The use of environmental protection systems on ships is vital to:
- Preventing harmful discharges into sensitive waters
- Reducing air and water pollution from vessels
- Ensuring compliance with international maritime laws
- Protecting marine ecosystems and coastal livelihoods
NIMEPA’s Advocacy for Cleaner Seas
At NIMEPA, we emphasize the importance of ships adopting and maintaining marine environment protection systems. Through awareness, advocacy, and collaboration with maritime stakeholders, we support stronger enforcement of international standards to safeguard Nigeria’s waters and global oceans.
When ships are properly equipped and operated, they become part of the solution—transporting goods without threatening the environment.
