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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When hurricanes and other extreme storms unleash downpours like Tropical Storm Beta has been doing in the South, the floodwater doesn't always stay within the government's flood risk zones.
New research suggests that nearly twice as many properties are at risk from a 100-year flood today than the Federal Emergency Management Agency's flood maps indicate.
Flooding Outside the Zones<p>About <a href="https://furmancenter.org/files/Floodplain_PopulationBrief_12DEC2017.pdf" target="_blank">15 million</a> Americans live in FEMA's current 100-year flood zones. The designation warns them that their properties face a 1% risk of flooding in any given year. They must obtain flood insurance if they want a federally ensured loan – insurance that helps them recover from flooding.</p><p>In Greater Houston, however, <a href="https://doi.org/10.1111/j.1539-6924.2012.01840.x" target="_blank">47% of claims</a> made to FEMA across three decades before Hurricane Harvey were outside of the 100-year flood zones. Harris County, recognizing that FEMA flood maps don't capture the full risk, now <a href="https://www.hcfcd.org/floodinsurance" target="_blank" rel="noopener noreferrer">recommends that every household</a> in Houston and the rest of the county have flood insurance.</p><p>New risk models point to a similar conclusion: Flood risk in these areas outstrips expectations in the current FEMA flood maps.</p><p>One of those models, from the <a href="https://firststreet.org/flood-lab/research/2020-national-flood-risk-assessment-highlights/" target="_blank">First Street Foundation</a>, estimates that the number of properties at risk in a 100-year storm is 1.7 times higher than the FEMA maps suggest. Other <a href="https://doi.org/10.1088/1748-9326/aaac65" target="_blank" rel="noopener noreferrer">researchers</a> find an even higher margin, with 2.6 to 3.1 times more people exposed to serious flooding in a 100-year storm than FEMA estimates.</p>
What FEMA’s Flood Maps Miss<p>Understanding why areas outside the 100-year flood zones are flooding more often than the FEMA maps suggest involves larger social and environmental issues. Three reasons stand out.</p><p>First, some places rely on relatively old FEMA maps that don't account for recent urbanization.</p><p>Urbanization matters because impervious surfaces – think pavement and buildings – are not effective sponges like natural landscapes can be. Moreover, the process for updating floodplain maps is locally variable and can take years to complete. Famously, New York City was updating its maps when Hurricane Sandy hit in 2012 but hadn't finished, meaning flood maps in effect <a href="https://projects.propublica.org/nyc-flood/" target="_blank">were from 1983</a>. FEMA is required to assess whether updates are needed every five years, but the <a href="https://www.fema.gov/cis/nation.html" target="_blank" rel="noopener noreferrer">majority of maps</a> <a href="https://www.oig.dhs.gov/sites/default/files/assets/2017/OIG-17-110-Sep17.pdf" target="_blank" rel="noopener noreferrer">are older</a>.</p><p>Second, binary thinking can lead people to an underaccounting of risk, and that can mean communities fail to take steps that could protect a neighborhood from flooding. The logic goes: if I'm not in the 100-year floodplain, then I'm not at risk. Risk perception <a href="https://doi.org/10.1088/1748-9326/ab195a" target="_blank" rel="noopener noreferrer">research</a> backs this up. FEMA-delineated flood zones are the major factor shaping flood mitigation behaviors.</p><p>Third, the era of climate change scuttles conventional assumptions.</p><p>As the planet warms, extreme storms are becoming <a href="https://nca2018.globalchange.gov/" target="_blank">more common and severe</a>. If greenhouse gas emissions continue to increase at a high rate, computer models suggest that the chances of a severe storm dropping 20 inches of rain on Texas in any given year will increase from about 1% at the end of the last century to 18% at the end of this one, a chance of <a href="https://doi.org/10.1073/pnas.1716222114" target="_blank" rel="noopener noreferrer">once every 5.5 years</a>. So far, <a href="https://www.rstreet.org/wp-content/uploads/2020/02/195.pdf" target="_blank" rel="noopener noreferrer">FEMA hasn't taken into account the impact climate change is having</a> on extreme weather and sea level rise.</p>
Racial Disparities in Flooding Outside the Zones<p>So, who is at risk?</p><p>Years of research and evidence from storms have highlighted social inequalities in areas with a high risk of flooding. But most local governments have less understanding of the social and demographic composition of communities that experience flood impacts outside of flood zones.</p><p>In analyzing the damage from Hurricane Harvey in the Houston area, I found that <a href="https://doi.org/10.1088/1748-9326/aba0fe" target="_blank">Black and Hispanic residents disproportionately experienced flooding</a> in areas beyond FEMA's 100-year flood zones.</p><p>With the majority of flooding from Hurricane Harvey occurring outside of 100-year flood zones, this meant that the overall impact of Harvey was racially unequal too.</p><p>Research into where flooding occurs in Baltimore, Chicago and Phoenix points to some of the potential causes. <a href="https://www.nap.edu/read/25381/chapter/4#16" target="_blank" rel="noopener noreferrer">In Baltimore and Chicago</a>, for example, aging storm and sewer infrastructure, poor construction and insufficient efforts to mitigate flooding are part of the flooding problem in some predominantly Black neighborhoods.</p>
What Can Be Done About It<p>Better accounting for those three reasons could substantively improve risk assessments and help cities prioritize infrastructure improvements and flood mitigation projects in these at-risk neighborhoods.</p><p>For example, First Street Foundation's risk maps account for <a href="https://firststreet.org/flood-lab/research/flood-model-methodology_overview/" target="_blank">climate change</a> and present <a href="https://floodfactor.com/" target="_blank" rel="noopener noreferrer">ratings</a> on a scale from 1 to 10. FEMA, which works with communities to update flood maps, is <a href="https://www.fema.gov/media-library-data/1521054297905-ca85d066dddb84c975b165db653c9049/TMAC_2017_Annual_Report_Final508(v8)_03-12-2018.pdf" target="_blank" rel="noopener noreferrer">exploring rating systems</a>. And the National Academies of Sciences, Engineering and Medicine recently <a href="https://www.nationalacademies.org/news/2019/03/new-report-calls-for-different-approaches-to-predict-and-understand-urban-flooding" target="_blank" rel="noopener noreferrer">called for a new generation of flood maps</a> that takes climate change into account.</p><p>Including recent urbanization in those assessments will matter too, especially in fast-growing cities like Houston, where <a href="https://authors.elsevier.com/a/1boBRyDvMFW6W" target="_blank" rel="noopener noreferrer">386 new square miles</a> of impervious surfaces were created in the last 20 years. That's greater than the land area of New York City. New construction in one area can also <a href="https://scalawagmagazine.org/2018/01/city-in-a-swamp-as-houston-booms-its-flood-problems-are-only-getting-worse/" target="_blank" rel="noopener noreferrer">impact older neighborhoods downhill</a> during a flood, as some Houston communities discovered in Hurricane Harvey.</p><p>Improving risk assessments is needed not just to better prepare communities for major flood events, but also to prevent racial inequalities – in housing and beyond – from <a href="https://www.npr.org/2019/03/05/688786177/how-federal-disaster-money-favors-the-rich" target="_blank" rel="noopener noreferrer">growing</a> after the unequal impacts of disasters.</p>
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