Helena Joyce
Sewage pollution is a pressing issue that plagues our rivers, seas, and coasts, causing a multitude of problems such as health risks, environmental degradation, and the destruction of delicate ecosystems. It is imperative to address this issue, especially in the marine environment, where the impact of pollution on fragile ecosystems is particularly severe. To combat sewage pollution at sea, various measures and regulations have been implemented, such as MARPOL Annex IV, which outlines requirements for sewage treatment plants on ships and specifies distances from land beyond which treated sewage discharge is permitted. Additionally, local bylaws and international regulations govern the discharge of wastewater and the operation of sewage treatment systems. Individual actions, such as reducing plastic waste, using eco-friendly products, and proper recycling, are also crucial in preventing sewage pollution at sea.
How to prevent pollution from sewage at sea
| Characteristics | Values |
|---|---|
| Sewage treatment | Sewage should be treated in a sewage treatment plant (STP) before discharge, removing nitrates, phosphates, and organic matter. |
| Sewage discharge regulations | Discharge of untreated sewage is prohibited within a certain distance from the nearest land, unless the ship has an approved STP and is proceeding at a minimum speed. |
| Ship inspections | Port state inspectors may examine the ship's pollution prevention system, including the sewage system, to ensure compliance with international and local regulations. |
| Ship requirements | Ships above a certain size or passenger capacity must be equipped with a sewage holding tank, an approved STP, or both, and have proper garbage management plans and records. |
| Sanitation systems | Sanitation systems capable of discharging sewage must be sealed or rendered inoperable, and oil-tight trays must be fitted under engines and gearboxes to prevent oil leaks. |
| Water quality monitoring | Authorities, environmental agencies, and industries must monitor water quality to ensure compliance with clean water targets and protect public health and the environment. |
| Wastewater infrastructure | Improving wastewater infrastructure and management is crucial to reducing sewage pollution and its impact on fragile marine ecosystems. |
| Eco-friendly products | Using and promoting eco-friendly products can reduce plastic waste and pollution entering the oceans. |
| Legislation and policy | Governments and local authorities should implement and enforce legislation that discourages plastic waste, reduces plastic production, and improves overall waste management. |
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What You'll Learn
Install sewage treatment plants on ships
Sewage from ships is a significant contributor to marine pollution. The discharge of sewage into the sea is prohibited unless the ship has an approved sewage treatment plant in operation or is discharging comminuted and disinfected sewage using an approved system at a distance of more than three nautical miles from the nearest land.
To address this issue, sewage treatment plants can be installed on ships to treat sewage and make it suitable for discharge into the sea. These plants can be fully automatic, reducing maintenance requirements and long-term operating costs. They are also designed to be compact and adaptable to new-build specifications.
The sewage treatment process typically involves the following steps:
- Sewage enters the plant through an inlet pipe with a proper slope to prevent clotting and condensation.
- A screen filter mesh removes non-sewage components like toilet paper, plastic, and other solids that could clog the system.
- The sewage then passes through a biofilter reactor, where fine air bubbles supplied from an aeration blower disperse the contaminated substance, breaking down organic matter with the help of aerobic microorganisms.
- The treated sewage water moves to a settling chamber, where it remains until a high level is reached and is then discharged automatically until a low-level switch activates.
- In some plants, disinfection is achieved through ultraviolet radiation.
- The treated sewage may be discharged directly into the sea or transferred to a shore facility, depending on the ship's location and applicable regulations.
It is important to note that the discharge of untreated sewage is prohibited in certain designated Special Areas, such as the Baltic Sea, where stricter regulations are in place to protect vulnerable marine environments.
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Improve wastewater infrastructure
Improving wastewater infrastructure is essential to preventing sewage pollution at sea. This involves addressing the technological and infrastructural shortcomings that currently exist. Firstly, it is crucial to prioritize the upgrade and maintenance of sewage treatment facilities. This includes investing in advanced wastewater treatment systems, such as those that can effectively remove pathogens, nutrients, and pollutants like nitrogen and phosphorus. These upgrades are particularly important in areas with inadequate sanitation infrastructure, which often includes low- and lower-middle-income countries, as well as rural areas in wealthier nations.
Secondly, there is a need to transition away from outdated cesspools and septic systems, which allow household waste to contaminate ground and surface waters. Instead, households should be connected to centralized sewers and advanced wastewater treatment systems. This will help prevent the flow of untreated sewage into local waterways and the sea, reducing the associated human health and ecological risks.
Thirdly, stormwater management needs to be improved. Encouraging the adoption of green infrastructure and low-impact development practices can help reduce polluted runoff in coastal communities. This involves implementing measures that allow rainwater to soak into the ground, reducing the volume of stormwater that mixes with sewage and ultimately ends up in the ocean.
Additionally, funding for wastewater infrastructure improvement projects should be increased. While philanthropic funding has been provided for marine conservation and public health initiatives, ocean sewage pollution has received relatively limited funding. Increasing investment in wastewater infrastructure can help address this issue at its source.
Lastly, it is important to recognize that preventing sewage pollution at sea is not solely an infrastructural challenge but also a behavioral one. Educational initiatives and cultural shifts are necessary to encourage individuals to properly dispose of waste and support pollution prevention measures. This includes raising awareness about the impacts of sewage pollution and promoting the adoption of sustainable practices, such as those outlined in the Clean Water Act.
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Implement better stormwater management
Stormwater management is a critical aspect of preventing sewage pollution at sea, especially in coastal communities. When rain falls on impervious surfaces like rooftops, roads, and parking lots, it becomes runoff that carries pollution into local waterways and, eventually, the ocean. This runoff, known as stormwater, collects and transports various pollutants, including animal waste, litter, salt, pesticides, fertilizers, oil, grease, and soil. This can lead to sewage pollution in the sea.
Implementing better stormwater management practices can help mitigate these issues. Here are some strategies to achieve this:
- Encourage the use of green infrastructure and low-impact development practices: Promote the use of permeable surfaces that allow rainwater to soak into the ground, such as porous pavements, rain gardens, and bioswales. These surfaces help to reduce the volume of stormwater runoff and naturally filter pollutants.
- Implement better land-use planning: Consider the impact of development on stormwater management. Preserve and protect natural water-absorbing features like wetlands and floodplains. Create buffer zones along waterways to filter and absorb stormwater runoff.
- Promote rainwater harvesting: Encourage the use of rain barrels and rainwater collection systems. This reduces the demand for freshwater and allows the collected rainwater to be used for non-potable purposes, such as irrigation and cleaning.
- Improve septic system maintenance: Regularly inspect, maintain, and pump septic systems to prevent leaks and overflows. Proper maintenance ensures that harmful bacteria and pollutants do not leach into storm sewers and local waterways.
- Educate the public about stormwater pollution: Raise awareness about the impact of individual actions on stormwater pollution. Encourage residents to properly dispose of waste, reduce the use of fertilizers and pesticides, and avoid dumping anything down storm drains.
- Implement regular maintenance of stormwater infrastructure: Ensure that stormwater ponds, ditches, and drainage systems are well-maintained to effectively capture and treat stormwater runoff. Regular maintenance can help prevent blockages and overflows that contribute to sewage pollution.
By implementing these improved stormwater management strategies, communities can significantly reduce the amount of pollution that reaches the sea, protecting both public health and the environment.
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Upgrade sanitation systems on vessels
Upgrading sanitation systems on vessels is crucial to preventing sewage pollution at sea. Here are some detailed instructions for vessel owners and operators to improve their sanitation systems:
Firstly, ensure that all vessels are equipped with either an approved sewage treatment plant or an approved sewage comminuting and disinfecting system. This is a requirement for ships of 400 gross tonnage and above or those certified to carry more than 15 people, as per MARPOL regulations. The sewage treatment plant should meet the nitrogen and phosphorus removal standards when tested for its Certificate of Type Approval. This is especially important for passenger ships intending to discharge sewage effluent in Special Areas, such as the Baltic Sea.
Secondly, implement a sewage holding tank system. This is required even if advanced treatment equipment is available on the ship. The capacity of the holding tank should be determined by considering the ship's operation, voyage details, and the total number of crew members on board. The holding tank should also have a visual indicator to show the amount of its contents.
Thirdly, establish a comprehensive garbage management plan, as outlined in the Merchant Shipping (Prevention of Pollution by Garbage) Regulations. This includes proper disposal procedures, maintenance of a garbage record book, and adherence to placard requirements for crew and passenger information.
Additionally, it is essential to train the crew on the correct use of the sanitation systems. This includes educating them on international and local regulations, such as not putting any non-biodegradable items down the toilets and using only approved chemicals for cleaning. Regular inspections and maintenance of the sewage plant should also be conducted, including checks on the internal chamber for any signs of metal wastage and chlorine content in the effluent.
Finally, when discharging sewage, ensure that it is only done when the ship is more than three nautical miles from the nearest land and is proceeding at a speed of four knots or more. For untreated sewage, the distance should be increased to more than 12 nautical miles, and the rate of discharge should be approved by the relevant administration.
By following these instructions and upgrading sanitation systems, vessel owners and operators can significantly reduce sewage pollution at sea and protect the fragile marine ecosystem.
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Reduce plastic production and waste
Plastic pollution is one of the greatest threats to ocean health. Every year, about 10 million tons of plastic waste is dumped into the seas, and this number is projected to triple by 2040. The primary sources of microplastics are the products people use, such as laundry and wastewater from washing machines.
To reduce plastic production and waste, we can adopt the following habits:
- Reduce plastic use: Take note of how often you rely on single-use plastics and replace them with reusable versions. For example, carry a reusable bag to the store, a garment bag to the dry cleaner, silverware to the office, or a travel mug to the coffee shop.
- Reuse and recycle: Search thrift stores, garage sales, or online for second-hand items instead of buying new ones. Borrow items that you rarely need before deciding to buy them.
- Buy in bulk: Consider the product-to-packaging ratio and select larger containers instead of buying several smaller ones.
- Choose non-plastic packaging: When possible, opt for products in non-plastic packaging. For example, choose a glass jar of honey instead of a squeezable plastic container.
- Select natural textiles: An estimated 9% of ocean microplastics come from synthetic fibres such as nylon, acrylic, polyester, and fleece. Choose clothing and textiles made of natural materials like cotton and wool instead.
- Support eco-friendly alternatives: Some industries are adopting naturally decomposing plastics, such as PLA, which breaks down naturally with little to no pollution. Support companies that use these eco-friendly alternatives.
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Frequently asked questions
MARPOL ANNEX IV is a regulation that states that ships of 400 GT and above, which are engaged in international voyages and carry a minimum of 15 people onboard, must be equipped with either a sewage holding tank of appropriate capacity or an approved sewage treatment plant (STP) or both.
STP is a sewage treatment plant that treats raw sewage and discharges comminuted and disinfected sewage.
The discharge of sewage from a ship is generally prohibited unless the ship has an approved sewage treatment plant that can treat raw sewage. The ship must also be more than three nautical miles from the nearest land and be proceeding at a speed of four knots or above.
Sewage pollution can have a severe impact on fragile marine ecosystems. Untreated sewage contains high concentrations of nitrates, phosphates, and organic matter, which can contaminate water bodies and consume oxygen, making it difficult for natural aquatic fauna to survive.
Individuals can play a role in preventing sewage pollution at sea by reducing plastic waste, using eco-friendly products, and improving waste management practices. This includes avoiding products with microbeads, opting for reusable items, and recycling properly.
