The Ocean Cleanup's 'Interceptor' Aims to Clean 1,000 Rivers in 5 Years. Will It Work?
By Rachael Meyer, Basten Gokkon
It had rained all morning across Jakarta on the first Tuesday in February. The rivers in the Indonesian capital quickly filled up, carrying all kinds of debris toward the Java Sea. In one of the city's largest waterways, a Dutch-made device was trapping some of the trash to prevent it from washing out into the ocean.
The Interceptor 001 had been shipped to Jakarta in early 2019 by its inventor, the Rotterdam, Netherlands-based nonprofit organization The Ocean Cleanup (TOC). The prototype has been on a trial run since May 2019 near the mouth of the Cengkareng drain, which connects the city's notoriously garbage-laden Angke River to the Java Sea.
Jakarta's prototype is the first generation of a device that TOC aims to deploy in 1,000 of the world's most polluted rivers in just five years. The organization estimates these waterways are responsible for carrying 80 percent of ocean trash out to sea, with the remaining 20 percent of marine trash coming from around 30,000 other rivers.
There are two Interceptors currently installed, the second on the Klang River in Kuala Lumpur, Malaysia. According to Chris Worp, TOC's managing director, the group plans to deploy another Interceptor to the Rio Ozama in the Dominican Republic this month, and a fourth to southern Vietnam.
Donors from all over the world have invested millions of dollars in TOC to help the organization accomplish what it says are "ambitious" and "novel" solutions to the scourge of oceangoing trash. But the process has not been smooth. Mongabay visited the prototype in Jakarta in February and found issues with the device. Now, TOC is facing allegations that it copied the design of another successful river cleanup device patented more than a decade ago.
The river-cleaning project is part of The Ocean Cleanup's overall goal to reduce the amount of trash in the ocean. CEO Boyan Slat founded the organization in 2013 to create an open-ocean device that would remove all plastic in the Great Pacific Garbage Patch in five years. After many iterations and much media attention and criticism from scientists, a 160-meter (525-foot) test design collected and retained ocean plastic for the first time in October last year.
Over the course of the project, many scientists encouraged the organization to focus its efforts on rivers, where they said a cleanup device would be more effective. TOC took heed in 2015, when it began developing the Interceptor.
The Interceptor is powered by solar panels atop its white exterior shell. Each device's unique number is painted on one of its long sleek sides, facing to the banks of the river. At water level, a long waste barrier protrudes upstream, allowing the force of the current to push trash toward the device's mouth. There, a conveyor belt lifts debris out of the water and deposits it onto a platform inside the device that shuttles trash to one of six dumpsters. Once the containers are full, a local team takes them to shore to be emptied.
The latest Interceptor design can extract 50,000 kilograms (110,000 pounds) of plastic per day — double that under "optimal conditions" — and can hold 50 cubic meters (1,770 cubic feet) of garbage, according to TOC's website. The prototype in Jakarta has about one-fourth to one-fifth that capacity, and holds the trash in small crates instead of dumpsters. As a result, it needs to be maintained and emptied more frequently.
During the Interceptor's splashy unveiling event last October in Rotterdam, Slat called it the first "integrated system that you can bring anywhere in the world and install within days."
That's just not so, according to John Kellett, founder and president of Clearwater Mills LLC. In 2014, Kellett installed a device called the Waterwheel Powered Trash Interceptor in the Jones River in Baltimore, Maryland. This device, dubbed "Mr. Trash Wheel," uses booms to funnel trash to its mouth and a conveyor belt to lift trash out of the water. A key difference from TOC's Interceptor is that a water wheel powers the conveyor belt and solar-powered water pumps keep the wheel going when the current is weak. Due to its success, Baltimore now has three trash wheels, and Clearwater Mills is working in California, Texas and Panama to bring its design worldwide.
"They were aware of our efforts, experience and success when they developed their river device in secret and publicly dismissed it while borrowing heavily from our technology," Kellett told Mongabay of TOC.
In an email addressing these claims that Kellett shared with Mongabay, he informed TOC that Clearwater Mills had patented its device's design more than a decade ago. Kellett also told TOC that he thought their changes "make it more expensive, less effective and harder to maintain."
"We would love to see that the resources and efforts allocated to this global crisis are used effectively and that we are not duplicating efforts or working at cross purposes," he told Mongabay.
Worp acknowledged that the two devices share similar elements, but said TOC started its design from scratch. "It would be like saying one car is the same as all the others," he said. "We obviously know about the other systems that are out there, but we've really taken this from a different angle to find a scalable, high capacity, high efficiency solution."
According to Kellett, TOC has approached some of the organizations that Clearwater Mills is working with outside Baltimore to offer them an Interceptor instead. Worp denied this, and told Mongabay that his team doesn't see any other solutions as competitive.
Getting the Public Involved in Trash
For both organizations, finding a solution to river pollution goes beyond the cleanup devices.
"They're providing an opportunity to educate the public and inspire people to become part of the solution," Kellett said of the three devices his company deployed in Baltimore, which have spurred countless local environmental activities and educational programs.
According to Worp, several school groups have visited the Interceptor prototype in Jakarta. Community engagement is important to The Ocean Cleanup because it ultimately relies on local organizations to operate and maintain the devices.
Some scientists are skeptical about TOC's goal of targeting so many rivers in vastly different parts of the world. Andrew Gray, a hydrologist at the University of California, Riverside, studies small mountainous watersheds that expel a large amount of sediment to the ocean during strong storms. These storms can be destructive to any man-made device, he said.
"[These storms] that are probably discharging most of the plastics, are the kinds of events that you're not going to have a trash boom up because the hydrodynamics are far too aggressive," he said.
Gray also said the Interceptor would need to be incredibly versatile to accommodate a variety of river sizes.
Win Cowger, a graduate student in Gray's lab, pointed out the unpredictability of natural systems.
"Whenever you apply one solution — one device — to a broad range of ecosystems and a broad range of circumstances, it tends to have some implications that you might not have expected," he said.
Rainy Days in Jakarta
Early this year, Jakarta experienced one of its worst flooding disasters in recent years. Torrential rain, with a record-breaking intensity, showered Greater Jakarta for almost 16 hours through New Year's Eve and into New Year's Day. Most of the city's rivers flooded their surroundings. The Interceptor was found damaged after its waste barrier broke loose.
The water volume in the Cengkareng drain increased significantly, but never overflowed its banks, according to Muhammad Khusen, the leader of a waste-collecting worker group in the subdistrict where the Interceptor is located. He said it was the river's strong current that damaged the device's waste barrier, but TOC engineers were able to repair it the following day.
When Mongabay visited the device a few weeks later, in February, the rains were constant, albeit less intense than at the start of the year. While the Interceptor was undamaged, waste had piled up on the barrier and clogged up the device's opening.
Workers were using long poles to try to break up the clog, which included a lot of large organic material like branches, bamboo and banana tree trunks, and feed the debris bit by bit into the Interceptor.
A team of three workers has been assigned to collect the trash and maintain the device every day, Khusen said. But on the day of Mongabay's visit, he had to call in reinforcements. As many as 10 workers were on hand throughout the afternoon to help clean up the collected debris after an earlier attempt failed to get much done. When the workers went home at 3 p.m., only about 20 percent of the trapped debris had been taken out.
Workers and officials told Mongabay it was impractical to collect all of the trapped debris, largely because of the configuration of the device. For instance, Khusen said the waste-trapping barrier was so thin that his crew couldn't stand on it to push or pull the debris into the device's mouth. He said he preferred pontoon-style barriers they can stand on.
Another challenge is the 2-meter (6.6-foot) opening of the processor, which Khusen said is too small for large waste to freely pass. Sometimes, he said, he has to call in additional human resources to handle big items, like a sofa, spring bed, and even a dead cow that turned up.
"I thought this device was sophisticated," Khusen told Mongabay. "Apparently, there's still so much manual work needed. I'd say it still has a lot of shortfalls."
Lambas Sigalingging, head of operations at the North Jakarta water department, shared similar sentiments. Lambas said the device's lack of movement made it unsuitable for rivers in Jakarta that rarely have much current unless it rains.
"So, if we don't [actively] catch the debris, how is it going to clean itself? Meanwhile, the Interceptor is standing still," he told Mongabay in a phone interview. "This device would be effective, I think, if the current was strong."
Lambas said Jakarta's environment agency owns three waste-trapping barriers installed upstream from the Interceptor in the Cengkareng drain. His own team operates other devices in the city's rivers, including garbage-collecting boats made by the German company BERKY, excavators, and floating polyethylene barriers. Some of these needed less labor to operate than the Interceptor, he said.
Lambas said he has shared the challenges his team faces operating the Interceptor with The Ocean Cleanup team at meetings. But he said he hasn't seen much improvement to the device yet. According to Lambas, the device's trial run has been extended twice — first until December and then until this April.
"But I must stress this with you: I'm not the one to say whether the Interceptor is effective or efficient," Lambas said. "I can't answer that because there's the [TOC] research team that assesses its efficiency and effectiveness."
Worp said the Interceptor is effective in the Cengkareng drain and has removed a large amount of trash that the booms upstream could not. He also told Mongabay that TOC is talking with operators in Jakarta to assess what happened during the heavy rains earlier this year, and that his team does respond to feedback from workers. For example, he said, TOC replaced labor-intensive collection bags with crates last year.
He also reiterated that the device in Jakarta is a prototype, and the lessons learned from it have led to adjustments to the second generation of Interceptors, such as the ability to accommodate larger debris loads.
However, he admitted the Interceptor will not suit every river. "It is definitely not the solution for all, and we will be looking at further solutions as we tackle more and more rivers going forward," he said.
According to TOC's website, the group is now coordinating with governments around the world to begin deploying Interceptors on a large scale.
Rachael Meyer is a freelance writer based in Boston, Massachusetts. Her work focuses on technological solutions to environmental issues.
Basten Gokkon is a full-time staff writer with Mongabay based in Jakarta. His works have focused on issues pertaining to sustainable fisheries, marine conservation and indigenous people's rights.
Reposted with permission from Mongabay.
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In celebration of Earth Day, a star-studded cast is giving fans a rare glimpse into the secret lives of some of the planet's most majestic animals: whales. In "Secrets of the Whales," a four-part documentary series by renowned National Geographic Photographer and Explorer Brian Skerry and Executive Producer James Cameron, viewers plunge deep into the lives and worlds of five different whale species.
<span style="display:block;position:relative;padding-top:56.25%;" class="rm-shortcode" data-rm-shortcode-id="b102b19b2719f50272ab718c44703dd0"><iframe lazy-loadable="true" src="https://www.youtube.com/embed/xOySOlB78dM?rel=0" width="100%" height="auto" frameborder="0" scrolling="no" style="position:absolute;top:0;left:0;width:100%;height:100%;"></iframe></span>
Herring are a primary food source for Norway's orcas. Luis Lamar / National Geographic for Disney+
Belugas are extremely social creatures with a varied vocal range. Peter Kragh / National Geographic for Disney+
A Southern Right whales is pictured in the accompanying book, "Secrets of the Whales." Brian Skerry / National Geographic
The coronavirus has isolated many of us in our homes this year. We've been forced to slow down a little, maybe looking out our windows, becoming more in tune with the rhythms of our yards. Perhaps we've begun to notice more, like the birds hopping around in the bushes out back, wondering (maybe for the first time) what they are.
A Coeligena helianthea hummingbird is photographed during a birdwatching trail at the Monserrate hill in Bogota on November 11, 2020. Colombia is the country with the largest bird diversity in the world, home to about 1,934 different bird species, a fifth of the total known. JUAN BARRETO / AFP / Getty Images
1. Choosing the Right Binoculars<p>Binoculars are a relatively indispensable tool for most birders – but, for those just starting out, it might not yet be worth the several-hundred-dollar investment. If you aren't able to scour the attics of friends or borrow a pair from a fellow bird watcher, some local birding and naturalist groups have <a href="https://vashonaudubon.org/all-about-vashon-birds/binoculars-check-out/" target="_blank">binocular loaning programs</a> for members, allowing you to plan ahead for a day (or week) of birding.</p><p>When you're ready to take the plunge, choosing a pair or binoculars should take some careful deliberation based on your needs and preferences; some <a href="https://www.birdwatchersdigest.com/bwdsite/explore/optics/top-10-tips-buying-binoculars-bird-watching.php" target="_blank">major considerations</a> might include size, ease of use, <a href="https://www.rei.com/learn/expert-advice/binoculars.html" target="_blank" rel="noopener noreferrer">magnification</a>, and price. While professional binoculars can easily run north of $1,000, there are plenty of perfectly suitable entry-level binoculars under $200. You might not get the perfect precision and clarity of more elite models, but a less expensive pair will allow you to strengthen your birding skills while deciding if you're interested in investing in a premium pair.</p><p>For a budget-friendly option, check out resale options on eBay, Facebook marketplace, or neighborhood yard sales: you might find a nicer pair whose retail price isn't within your budget.</p>
2. Know What Birds Are in Your Area<p>When I began to pay more attention to the birds just outside my apartment building, I started to learn what species have always been around me: European starlings, house sparrows, blue jays, black capped chickadees, and the occasional red-bellied woodpecker. They had always been there, but I hadn't ever taken the time to identify them. Once you learn to <a href="https://www.audubon.org/news/get-know-these-20-common-birds_" target="_blank" rel="noopener noreferrer">recognize common birds</a> in your area, you'll be able to identify the typical species right outside your window and in your community. Of course, permanent residential birds in your neighborhood will <a href="https://nestwatch.org/learn/focal-species/" target="_blank" rel="noopener noreferrer">vary by region</a>, as will those migrating through it.</p>
3. Get Out and Explore<p>Venturing elsewhere might allow you to spot some different species beyond those frequenting your backyard. Anywhere with water or greenery offers a place for birding; as an urbanite myself, I've found that even small- and mid-sized parks in New York City allow me to find more elusive birds (although Central Park takes the crown for an afternoon of urban birding).</p><p>If you are able to travel a bit further from home, <a href="https://www.fws.gov/refuges/" target="_blank">national wildlife refuges</a> and <a href="https://www.americasstateparks.org/" target="_blank" rel="noopener noreferrer">state/national parks</a> are excellent places to explore bird habitats and perhaps log some less-common sightings. The American Birding Association also lists <a href="https://www.aba.org/aba-area-birding-trails/" target="_blank" rel="noopener noreferrer">birding trails by state</a>, and Audubon and BirdLife International identify <a href="https://www.audubon.org/important-bird-areas" target="_blank" rel="noopener noreferrer">Important Bird Areas (IBAs)</a> across the country – important bird habitats and iconic places that activists are fighting to protect – where birders can spot birds of significance.</p>
4. Finding a Bird: Stop, Look, Listen, Repeat<p>The National Audubon Society recommends the "<a href="https://www.audubon.org/news/how-find-bird" target="_blank">stop, look, listen, repeat</a>" mantra when seeking and identifying birds.</p><p>First and foremost, spotting birds requires attention. Stopping – getting out of the car, pausing on the sidewalk, trail, or in the backyard to look up – is the most important step.</p><p>When looking for birds, try to avoid gazing wildly around; rather, scan your surroundings, focusing on any odd shapes or shadows, trying to think about where a bird might perch (power lines, fence posts, branches), or keep an eye on the sky for flying eagles and hawks. In open areas like fields and beaches, you might have a more panoramic view, and can take in different sections of the landscape at a time. Look around with the naked eye before reaching for the binoculars to hone in.</p><p>While it can be hard to sift through the noise, listening for birds is perhaps an even more important element of bird watching than looking. Once you spend more time in the field, you'll be able to parse apart the racket and identify specific species, especially aided by Audubon's Bird Guide app or by learning from their <a href="https://www.audubon.org/section/birding-ear" target="_blank">Birding by Ear series</a>.</p><p>Repeat this pattern as you continue on your way, stopping to look and listen for birds as you go, rather than waiting for them to come to you. </p>
5. Identification<p>When you head out for a day of bird watching – especially when you're hoping to spot some new species – you'll want to be armed with the tools to identify what you see. <a href="https://www.audubon.org/news/how-identify-birds" target="_blank" rel="noopener noreferrer">Major considerations when identifying birds</a> are their group (such as owls, hawks, or sparrow-like birds), size and shape, behavior, voice, field marks, season, and habitat.</p><p>The <a href="https://www.sibleyguides.com/about/the-sibley-guide-to-birds/" target="_blank" rel="noopener noreferrer">Sibley Guide to Birds</a> and the <a href="https://www.hmhbooks.com/shop/books/peterson-field-guide-to-birds-of-north-america-second-edition/9781328771445" target="_blank" rel="noopener noreferrer">Peterson Field Guide</a> are widely considered the best books for identifying birds in North America, although many <a href="https://www.audubon.org/news/what-bird-guide-best-you" target="_blank" rel="noopener noreferrer">specialized guides</a> focus on specific species or regions as well.</p><p>Plenty of <a href="https://blog.nature.org/science/2013/05/27/boucher-bird-blog-apps-smart-birder/" target="_blank" rel="noopener noreferrer">bird identification apps</a> have popped up in recent years – including National Geographic Birds, Sibley eGuide to Birds, iNaturalist, Merlin Bird ID, and Birdsnap – which are basically a <a href="https://www.audubon.org/news/the-best-birding-apps-and-field-guides" target="_blank" rel="noopener noreferrer">field guide in your pocket</a>. I'm partial to the Audubon Bird Guide, which allows users to filter by common identifiers, including a bird's habitat, color, activity, tail shape, and general type, adding them all to a personal map to view your sightings.</p>
6. Recording Your Sightings<p><span>As you deepen your commitment to birding, you might join the community of birders that track and quantify their sightings, building their </span><a href="https://www.thespruce.com/what-birds-count-on-a-life-list-386704#:~:text=A%20life%20list%20is%20a,which%20birds%20you%20have%20seen." target="_blank" rel="noopener noreferrer">life list</a><span>.</span></p><p>While a standard notebook noting the date, species name, habitat, vocalizations, or any other data you wish to include will suffice, some birders opt for a more <a href="https://www.riteintherain.com/no-195-birders-journal" target="_blank" rel="noopener noreferrer">structured birder's journal</a> with pre-determined fields to record your encounters, take notes, draw sketches, etc.</p><p>Many birders also choose to record their sightings online and in shared databases (which include many of the field guide apps), often pinpointing them on a map for others to view. Launched by the Cornell Lab of Ornithology and Audubon, <a href="https://ebird.org/home" target="_blank" rel="noopener noreferrer">eBird is one of the largest databases and citizen science projects around birding</a>, where hundreds of thousands of birders enter their sightings, and users can explore birds in regions and hotspots around the world. Users can also record their sightings on the <a href="https://apps.apple.com/us/app/ebird/id988799279" target="_blank" rel="noopener noreferrer">eBird app</a>.</p>
7. Attracting Birds to Your Own Yard<p>Feeding birds is a common phenomenon: more than 40% of Americans maintain a birdfeeder to attract birds and watch them feast.</p><p>Not all birdfeed is created equal, however. Many commercial varieties are mostly made with "fillers" (oats, red millet, etc.) that birds will largely leave untouched. After researching what birds to expect in your area – and which ones you want to attract – you can create your own birdfeed with <a href="https://www.allaboutbirds.org/news/types-of-bird-seed-a-quick-guide/?pid=1142" target="_blank">seeds that will appeal to them</a>.</p><p>Beyond filling a birdfeeder, <a href="https://www.ecowatch.com/eco-friendly-lawn-2651194858.html" target="_self">transforming your yard into an eco-friendly oasis</a> is by far the best way to attract birds. Choosing to forgo mowing your lawn, planting native flowers and grasses, and ditching the pesticides will bring back the bugs that birds feed on, and provide a safe haven in which birds can happily live and eat.</p><p>While it's widely considered acceptable – and even beneficial – to feed birds with appropriate seeds, communal birdfeeders often <a href="https://www.audubon.org/news/to-feed-or-not-feed" target="_blank" rel="noopener noreferrer">foster unlikely interactions between different species</a>, who can then transmit harmful diseases and parasites to one another. Maintaining several bird feeders with different types of seeds might keep different species from coming into contact, and feeders can be <a href="https://www.allaboutbirds.org/news/how-to-clean-your-bird-feeder/" target="_blank" rel="noopener noreferrer">cleaned to prevent the spread of infection</a>.</p>
8. Inclusivity and Anti-Racism in the Birding Community<p>Like all outdoor activities and areas of scientific study, birding communities are subject to racist and discriminatory ideologies. Black birders have long experienced discrimination and underrepresentation in outdoor spaces. The work of organizations like the <a href="https://www.instagram.com/birdersfund/" target="_blank">Black & Latinx Birders Fund</a>, <a href="https://www.instagram.com/birdability/" target="_blank">Birdability</a>, and <a href="https://www.instagram.com/feministbirdclub/" target="_blank">Feminist Bird Club</a> highlight the contributions and importance of birders of color, birders with disabilities, and women and LGBTQ+ birders to the birding community, as do activists and naturalists like <a href="https://www.instagram.com/hood__naturalist/" target="_blank">Corina Newsome</a> and <a href="https://www.instagram.com/tykeejames/" target="_blank">Tykee James</a>. The work of <a href="https://www.audubon.org/news/its-bird-new-comic-written-central-park-birder-christian-cooper" target="_blank">Christian Cooper</a>, <a href="https://camilledungy.com/publications/" target="_blank">Camille Dungy</a> (read her poem <a href="https://www.poetryfoundation.org/poetrymagazine/poems/58363/frequently-asked-questions-10" target="_blank">Frequently Asked Questions: 10</a>), and <a href="https://orionmagazine.org/article/9-rules-for-the-black-birdwatcher/" target="_blank">J. Drew Lanham</a> – including his essay "<a href="https://lithub.com/birding-while-black/" target="_blank">Birding While Black</a>" – are a great place to start.</p><p>Getting involved in birding means educating ourselves on these issues and taking meaningful action; the work of <a href="https://www.audubon.org/news/its-bird-new-comic-written-central-park-birder-christian-cooper" target="_blank">Christian Cooper</a> and <a href="https://orionmagazine.org/article/9-rules-for-the-black-birdwatcher/" target="_blank">J. Drew Lanham</a> – including his essay "<a href="https://lithub.com/birding-while-black/" target="_blank" rel="noopener noreferrer">Birding While Black</a>" – are a great place to start. Just as birders are activists for protecting habitats and natural areas, we must also be active and aware of inclusivity in these spaces.</p>
9. Get Involved<p>To learn from and enjoy the company of other birders, check out local birding groups in your area to join. Many Audubon chapters host trips, meetings, and bird walks for members. The American Birding Association even maintains a <a href="https://www.aba.org/festivals-events/" target="_blank">directory of birding festivals</a> across the country.</p><p>Volunteering for birds is also a great way to meet other birders and take action for birds in your community; local organizations might have opportunities for assisting with habitat restoration or helping at birding centers.</p><p>Like all wildlife, climate change and habitat destruction threaten the livelihood of birds, eliminating their breeding grounds and food sources. A <a href="https://www.audubon.org/climate/survivalbydegrees" target="_blank">2019 report released by the National Audubon Society</a> found that two-thirds of North American birds may face extinction if global temperatures rise 5.4 degrees Fahrenheit by 2100. Staying informed about and taking action for legislation designed to protect birds and our climate – such as the recent <a href="https://www.congress.gov/bill/116th-congress/house-bill/5552/text" target="_blank" rel="noopener noreferrer">Migratory Bird Protection Act</a> – is important for ensuring a livable future for wildlife and humans alike.</p><p><em>Linnea graduated from Skidmore College in 2019 with a Bachelor's degree in English and Environmental Studies, and now lives in Brooklyn, New York. Most recently, Linnea worked at Hunger Free America, and has interned with WHYY in Philadelphia, Saratoga Living Magazine, and the Sierra Club in Washington, DC. </em><em>Linnea enjoys hiking and spending time outdoors, reading, practicing her German, and volunteering on farms and gardens and for environmental justice efforts in her community. Along with journalism, she is also an essayist and writer of creative nonfiction.</em></p>
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