Maya Ellison
Plastic waste in rivers is a pressing environmental issue, with up to 12.7 million metric tons of plastic entering the ocean annually. This waste harms marine life and endangers ecosystems. To combat this, various methods have been developed to filter plastic from rivers, including large-scale booms, river booms, trash wheels, and conveyor systems. These technologies are designed to capture plastic waste and prevent it from flowing downstream, causing further damage. Some organizations, like The Ocean Cleanup, focus on intercepting river plastic before it reaches the ocean, while others aim to clean up existing plastic pollution in rivers. The success of these interventions depends on factors such as river width, depth, flow speed, and debris composition.
| Characteristics | Values |
|---|---|
| Understanding the problem | Rivers are the main source of ocean plastic pollution. 1000 hyper-polluting rivers are responsible for roughly 80% of riverine pollution. |
| Data collection methods | Drone surveys, camera monitoring, physical sampling, GPS trackers, wind and rainfall simulations, and field studies. |
| Plastic transport | Wind and rain mobilize and transport plastic into water bodies. |
| Plastic types | Macroplastics and microplastics. |
| Plastic removal techniques | Large-scale booms, river booms, waterway traps, litter traps, robots, boats, wheels, beach cleaners, magnetic filtration, Interceptor technology, fences, conveyor belts, and trash-scooping barges. |
| Plastic disposal | Recycling, producing building materials, or proper waste disposal. |
| Education and awareness | Educating communities about the plastics problem and raising awareness about plastic pollution. |
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What You'll Learn
Using large-scale booms and barriers
The Interceptor Barricade is a large-scale boom and barrier system designed to filter plastic out of rivers. It was installed in the Rio Las Vacas in Guatemala to stop the yearly floods of trash that occur during the rainy season. The Interceptor Barricade consists of two booms: one upstream and one downstream. The upstream boom takes on the majority of the pressure and waste, while the downstream boom catches any plastic missed or lost due to pressure build-up and rapid trash accumulation.
The Interceptor Guard is another tool that can be used in conjunction with the Interceptor Barricade. It is specifically designed for shallow waters and can prevent captured trash from flowing back upstream. In D'Aguilar Gully, Kingston Harbour, Jamaica, the Interceptor Guard was used in combination with an Interceptor Barrier to create a "no-return boom". This combination is particularly useful in gullies, where wind and waves can move trash too far from the Interceptor Tender's reach, making extraction more difficult.
The Interceptor Original is a high-tech river cleanup technology with solar-powered mechanics, smart processing, and easy performance tracking. It is designed for series production and can be used in a variety of locations with different river characteristics such as width, depth, flow speed, debris composition, seasonality, and tides.
Large-scale booms and barriers, such as those used in the Interceptor systems, are effective tools for filtering plastic out of rivers. They can be strategically placed upstream and downstream to catch the majority of waste and prevent plastic from entering oceans, which is crucial as rivers are the main source of ocean plastic pollution.
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Conveyor belt systems
The Interceptor has been deployed in various rivers worldwide, including Malaysia, Indonesia, Vietnam, the Dominican Republic, and the USA. It is designed to work in a wide range of river conditions and can be tailored to specific needs. This versatility allows it to address plastic pollution in diverse environments. The conveyor belt system can also adapt to the volume of waste and the river's characteristics. For instance, in some rivers with a concentrated path of debris, the conveyor belt directly collects the trash flowing towards it. In other cases, a guardrail or fence may be used to channel plastic towards the conveyor belt.
The Azure System, created by the tech start-up Ichthion, is another successful conveyor belt system. This technology is currently being used in Ecuador to remove plastic from rivers. The Azure System employs a boom device that stretches across the river, capturing floating debris. The design allows fish and other organisms to pass freely beneath it. The natural water flow directs the debris into one corner of the riverbank, where a manual operator guides it onto a mobile conveyor belt. The plastic is then dumped into containers on the shore for sorting, recycling, or landfill disposal.
The implementation of conveyor belt systems for river plastic filtration has significant environmental benefits. By removing plastic waste from rivers, these systems help prevent plastic from entering marine ecosystems and contributing to the growing problem of ocean plastic pollution. Additionally, the data collected during these filtration processes can be used to identify the sources of plastic waste. This information is crucial for developing long-term solutions and promoting community involvement in plastic reduction and proper waste management.
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Trash-scooping solar-powered barges
The trash-scooping solar-powered barge, known as the "Interceptor", is a key innovation in the battle against plastic pollution in our rivers and oceans. The Interceptor is a 78-foot-long vessel that resembles a large houseboat and operates silently and autonomously. It was invented by Dutch teenager Boyan Slat, who founded the non-profit organisation The Ocean Cleanup.
The Interceptor barge uses a curved barrier to catch waste floating downstream, directing it into the "mouth" of the barge. From there, the trash is lifted out of the water onto the boat via a conveyor belt. The barge can collect up to 50 tons of waste per day, with the trash being dropped into dumpsters for recycling or landfill disposal. This innovative barge has been deployed in several locations, including the Klang River in Malaysia, Jakarta in Indonesia, and rivers in Vietnam and the Dominican Republic.
The Klang River, heavily polluted by plastic and other debris, saw significant improvements due to the Interceptor. Syaiful Azmen Nordin, managing director of a Malaysian firm, remarked on the positive impact, stating, "The Klang river was like a floating landfill... Now you can see the river is generally free from floating debris." The Interceptor barge works in conjunction with existing log barriers placed along the waterway to catch trash, enhancing the effectiveness of waste collection.
The Ocean Cleanup organisation aims to tackle the 1000 most polluting rivers, which are responsible for approximately 80% of riverine pollution. By intercepting river plastic, they strive to prevent plastic from reaching the oceans and mitigate the environmental crisis. The Interceptor is designed for series production, and The Ocean Cleanup has partnered with Konecranes to manufacture more of these innovative barges to address river pollution globally.
The Interceptor's deployment in various rivers worldwide demonstrates its adaptability and effectiveness in combating plastic pollution. The curved barrier design guides trash into the barge's mouth, making it a highly efficient waste collection system. With each barge costing around 700,000 euros, The Ocean Cleanup expects the price to decrease as more are produced, making it a scalable solution for river cleanup projects worldwide.
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Modelling and measuring plastic transport
One key factor in modelling plastic transport is understanding the behaviour of plastic particles in water. Plastic particles have unique characteristics, including low density, persistence, a wide size range, and variable shapes, which set them apart from other particles. These properties influence their transport and fate in freshwater systems. For instance, larger plastic debris from low-density polymers like polyethylene (PE) and polypropylene (PP) are typically transported in normal flat water, while high-density polymers like polyvinyl chloride (PVC) are flushed from riverbeds during flooding events.
To improve models, empirical data about the effects of environmental factors on plastic transport is essential. For example, studies have investigated the impact of wind and rain on the mobilisation and transport velocity of larger plastic items. It was found that plastic bags, cups, wrappers, and bags are significantly influenced by wind, with bags reaching rivers first when gusts of wind blow over the land. This data helps calibrate and validate models, ensuring they accurately represent plastic behaviour in different conditions.
Additionally, the development of methodologies for measuring microplastic transport at various depths in medium and large rivers is crucial. A net-based device with different mesh sizes (41 µm, 250 µm, and 500 µm) has been proposed, allowing measurements at different depths of the water column. This methodology was tested in the Austrian Danube River, revealing high heterogeneity in microplastic concentrations within a single cross-section. Such multipoint measurements are necessary for understanding the spatial distribution of plastic concentrations and calculating plastic transport rates.
Furthermore, models can be categorised into several types, including emission-based mass balance modelling, global modelling, multimedia modelling, and spatiotemporally explicit modelling. Each model type has unique characteristics and applications, contributing to our understanding of plastic transport in rivers. For instance, global models consider the spatial and temporal variability of plastic pollution, while spatiotemporally explicit models focus on the local and regional scales.
In conclusion, modelling and measuring plastic transport in rivers is a complex task that requires a combination of empirical data, advanced measurement techniques, and various modelling approaches. By improving our understanding of plastic behaviour in rivers, we can develop more effective strategies to tackle plastic pollution and protect our ecosystems from its detrimental effects.
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Community education and engagement
Raise Awareness and Educate the Public:
Informing communities about the issue of plastic pollution in rivers is crucial. Education programs can create a sense of environmental responsibility and lead to behavioral changes. Share information about the impacts of plastic pollution on ecosystems, wildlife, and human health. Explain how plastic waste enters rivers and the importance of intercepting it before it reaches the oceans. Utilize scientific data and research findings to support your message and provide a clear call to action for individuals and communities.
Partner with Local Organizations:
Collaborate with local non-governmental organizations (NGOs), community groups, and environmental initiatives to engage the public and address plastic pollution. These partnerships can help spread the message, organize events, and implement educational programs. For example, The Ocean Cleanup partnered with local NGOs in Kingston, Jamaica, to raise awareness about plastic pollution among the youth in the community.
Community Clean-up Programs:
Involve local communities in river clean-up programs. Provide opportunities for people to actively participate in removing plastic waste from rivers and their surroundings. This can foster a sense of ownership and investment in the issue. For instance, the Clean Currents Coalition works with local projects worldwide to clean up rivers and educate communities about plastic pollution.
Recycling and Waste Management:
Educate communities about the importance of proper waste management and recycling. Provide information on how to reduce, reuse, and recycle plastic items. Share best practices and success stories from other communities to inspire and motivate people. Work with local waste management companies and recycling centers to ensure that collected plastic waste is properly handled and recycled whenever possible.
School and Youth Engagement:
Involve schools and youth organizations in educational programs and initiatives. Educate young people about the importance of reducing plastic pollution and encourage them to take action. Youth engagement can have a lasting impact, as these individuals will be future decision-makers and community leaders. The Ocean Cleanup's partnership in Kingston, Jamaica, included raising awareness among the youth about plastic pollution.
Utilize Social Media and Digital Platforms:
Leverage the power of social media and digital communication to reach a wider audience. Create online campaigns and share information, success stories, and calls to action on various platforms. Encourage community members to share their experiences and spread awareness within their networks.
By implementing these strategies, communities can become actively involved in addressing plastic pollution in rivers. Education, engagement, and behavioral changes are key components in tackling this global issue and creating a more sustainable future.
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Frequently asked questions
There are several ways to filter plastic out of rivers, including:
- Large-scale booms, which are large floating pipes that capture trash by stopping floating rubbish.
- River booms, which are large pipes attached to both sides of the river that guide waste to a litter trap.
- Waterway traps, which are anchored and fitted with a metal collection trap.
- Boats, which can be used to capture plastic.
- Water wheels, which are powered by the river's current and sometimes attached solar panels.
Some organizations working to filter plastic out of rivers include:
- The Ocean Cleanup, which deploys Interceptor technology in waterways to prevent floating waste from entering the ocean.
- TerraCycle Global Foundation, which installed two plastic clean-up systems featuring booms and nets on the Lat Phrao Canal in Bangkok.
- Chemolex Company and Smart Villages, which have established 10 plastic capture devices along the Athi river and its tributaries in Kenya.
- Clearwater Mills, which built Baltimore's trash wheels to address river waste.
- AlphaMERS, which has been using conveyor belts to remove waste from rivers.
Large-scale booms are set up in a V-shape across the river, with rubber skirts that extend about two feet below the water's surface. This catches trash floating downriver and funnels it towards the "mouth" of a rotating water wheel.
Filtering plastic out of rivers helps to preserve ecosystems and protect marine life. Rivers are the main source of ocean plastic pollution, with 1000 rivers responsible for roughly 80% of riverine pollution. By filtering plastic out of rivers, we can reduce the amount of plastic entering the ocean and prevent harm to the environment and aquatic species.
