Tag Archives: pollution by ships

How Air Pollution Infiltrates the Seas

A global effort to curb pollution from the heavy fuel oil burned by most big ships appears to be encouraging water pollution instead. A 2020 regulation aimed at cutting sulfur emissions from ship exhaust is prompting many owners to install scrubbing systems that capture pollutants in water and then dump some or all of the waste into the sea.

Some 4 300 scrubber-equipped ships are already releasing at least 10 gigatons of such wastewater each year, often in ports and sometimes near sensitive coral reefs…. The shipping industry says pollutants in the waste don’t exceed national and international limits, and that there’s no evidence of harm. But some researchers fear scrubber water, which includes toxic metals such as copper and carcinogenic compounds called polycyclic aromatic hydrocarbons, poses a rapidly growing threat, and they want to see such systems outlawed.

The emerging debate is the result of a 2020 regulation put into place by the International Maritime Organization (IMO), an arm of the United Nations that works with 174 member states to develop common rules for international shipping. By banning the use of sulfur-heavy fuel oil, the rule intended to reduce pollutants that contribute to acid rain and smog. IMO estimated the rule would slash sulfur emissions by 77% and prevent tens of thousands of premature deaths from air pollution in ports and coastal communities.

But cleaner fuel can cost up to 50% more than the sulfur-rich kind, and the rule allows ship owners to continue to burn the cheaper fuel if they install scrubbers. In 2015, fewer than 250 ships had scrubbers (often to comply with local regulations); last year, that number grew to more than 4300, according to industry figures.

A scrubber system sends exhaust through a meters-tall metal cylinder, where it is sprayed with seawater or freshwater, depending on the type, at rates comparable to gushing fire hydrants, to capture pollutants. In the most popular systems, called open loop scrubbers, seawater is discharged to the ocean after little or no treatment. Other systems retain sludge for disposal on land and release much smaller (but more concentrated) amounts while at sea….Researchers are particularly worried about discharges in areas that IMO has designated as ecologically sensitive. The Great Barrier Reef, for example, receives about 32 million tons of scrubber effluent per year because it’s near a major shipping route for coal. Ships also release scrubber water around the Galápagos Islands….

Ports see substantial discharges, too. Cruise ships dominate those releases, contributing some 96% of discharges in seven of the 10 most discharge-rich ports. Cruise ships typically need to burn fuel in port to continue to operate their casinos, heated pools, air conditioning, and other amenities. Most ports have shallow water, so pollutants are less diluted and can accumulate more rapidly….

Researchers, who are participating in a €7.5 million European effort to study shipping pollution called EMERGE, would like to study how scrubber water affects fish larvae.

But shippers have become hesitant to share samples and data with scientists. “We’re reluctant to give it to organizations which we know have already an established agenda,” says Mike Kaczmarek, chairman of the Clean Shipping Alliance 2020

The ultimate solution is to require ships to use the cleanest fuel, called marine gas oil. In the meantime, 16 countries as well as some localities have banned the most common scrubbers.

Excerpts from Erik StokstadShipping rule cleans the air but dirties the water, Science, May 13, 2021

The International Council on Clean Transportation (ICCT) study, released on April 9, 2021

Scrubbing Sulfur Pollution

From January 2020, the United Nations International Maritime Organization (IMO) will ban ships from using fuels with a sulphur content above 0.5%, compared with 3.5% now.The rules herald the biggest leap in how ships are powered since they switched from burning coal to oil over a century ago, but vessels will still be allowed to use higher-sulphur fuel if fitted with cleaning devices called scrubbers.  Closed-loop scrubbers keep most of the water used for sulphur removal onboard for disposal at port. Open-loop systems, however, remove sulphur coming through a ship’s smokestack with water that can then be pumped overboard.

Years of studies have examined whether open-loop scrubbers introduce into waterways acidic sulphur harmful to marine life, cancer-causing hydrocarbons, nitrates leading to algal blooms and metals that impair organ function and cause birth defects.  The results have largely been inconclusive and the IMO itself has encouraged further study into the environmental impact of scrubbers.

The stated aim of the new IMO measures is to improve human health..  A study in the journal Nature last year found ship emissions with current sulphur levels caused about 400,000 premature deaths from lung cancer and cardiovascular disease as well as around 14 million childhood asthma cases every year.

Singapore and Fujairah in the United Arab Emirates have banned the use of open-loop scrubbers from the start of next year. China is also set to extend a ban on scrubber discharge to more coastal regions. 

Excerpts from Noah Browning, Going overboard? Shipping rules seen shifting pollution from air to sea, Reuters, Oct. 21, 2019

Sailing the Seas Pollution Free

The shipping industry made a historic step toward cleaner air on April 13, 2018 with a deal to cut greenhouse gas emissions by half by 2050 compared to 2008…  Shipping and aviation were excluded from the Paris climate agreement adopted under a United Nations framework in 2015, with governments entrusting the International Maritime Organization (IMO) to come up with a consensus on carbon reduction measures from ocean going vessels.

The aviation sector reached a deal on carbon emissions in 2016, but it took shipping much longer as ocean carriers and regulators considered measures such as the adoption of clean-burning fuels or electric propulsion, slower sailing speeds and hull design improvements at a cost of hundreds of billions of dollars.  The deal puts the agreement into force world-wide, with no other action needed by the regulatory body. The final pact was a compromise between groups and countries including the European Union, China, and other Asia and Pacific nations that pushed for reductions in emissions by as much as 70% and the U.S., Argentina, Brazil and Saudi Arabia, among others, that pushed for lower targets.

Of the 173 IMO-member states, only the U.S. and Saudi Arabia, objected to the draft IMO agreement…Shipping contributes about 3% of total annual carbon dioxide (similar to an economy the size of Germany), or CO2, world-wide emissions, about the same as an economy the size of Germany, according to an IMO study. But vessel emissions are projected to increase by between 50% and 250% by 2050 as global trade grows and carriers add capacity without any action to intervene.  The IMO reductions would aim to cut carbon emissions to half the 2008 carbon dioxide levels.

The emission cuts will also affect thousands of exporters world-wide. Brazil, for example, exports large amounts of iron ore to China and fears strong caps will push up freight rates, helping rival Australia, whose iron exports sail half the distance to China.  Slow steaming, in which ships purposely throttle back to slower speeds, is also an anathema for countries exporting perishable goods like cherries from Chile and meat from Argentina.  Some countries with big shipping registries like the low-lying Marshall Islands, that want to stop the effects of climate change, led the call for strong cuts…

Excerpt from Shipping Regulators Reach Deal to Cut Carbon Emissions, Wall Street Journal,  Apr. 13, 2018

See also who is lobbying who on climate

How Ships Dump Oily Waste at Sea

A ship company based in Germany and the chief engineer on one of its vessels have agreed to plead guilty to illegally dumping oily water off Alaska.  The AML Ship Management GMBH and Nicolas Sassin, the chief engineer on the AML-operated ship City of Tokyo, agreed to plead guilty to violating federal clean water law by knowingly dumping 4,500 gallons of oily bilge water south of the Aleutian Islands.  The company and Sassin, 45, face a separate charge of presenting false pollution oversight records to the U.S. Coast Guard when the vessel docked in Portland, Oregon, prosecutors said.  As part of the plea deal, AML agreed to pay $800,000 in fines and community service payments…

Discharge of oily waste from vessels is a worldwide problem, said Kevin Feldis, first assistant U.S. attorney.”This is the first time we have charged Clean Water Act crimes for an actual discharge of oil into the EEZ (exclusive economic zone) off the coast of Alaska,” Feldis said in an email. “As detailed in the court documents, witnesses saw a sheen off the side of the vessel after the chief engineer hooked up a pump to illegally dump oily bilge water overboard.

Water routinely accumulates in the bilge, or bottom, of vessels. Federal law requires ships to store it until it can be treated on shore, or to run it through an onboard oil-water separator. Water that contains less than 15 parts per million of petroleum can be dumped overboard…On Aug. 29, 2015  as the ship passed 165 miles south of Alaska’s Sanak Island, Sassin used an illegal pump system to dump untreated oily bilge water over the side of the 603-foot ship, bypassing the oil-water separator and other pollution control equipment, prosecutors said.

“Nobody knows exactly how much oily waste is illegally dumped from ships, but as this case demonstrates, a determined engineer with a few pieces of equipment who does not have proper oversight can easily circumvent the pollution prevention equipment onboard vessels,” Feldis said.

Excerpt from DAN JOLING, German company, ship’s chief engineer reach plea agreement in Alaska marine pollution case, Associated Press, Feb. 12, 2015

Greening the Shipping Industry

The shipping industry faces the cost of complying with a deluge of new rules(issued by the International Maritime Organisation (IMO)). To make matters worse, it is in the middle of a slump caused by too many ships chasing too little trade.  As the deadlines for all these rules approach, shipping bosses are firing off distress flares. Masamichi Morooka, chairman of the International Chamber of Shipping (ICS), a lobby group, lamented on March 19th that the cost could run into “hundreds of billions” of dollars. He begged regulators to take into account the dire state of shipping

One of the first big expenses will be for cleaner fuel. Ships used to burn the cheap, unrefined crud, laden with sulphur and other nasties, that is left over when oil is refined. The fine soot that such fuel gives off can cause premature deaths from asthma and heart attacks. So in 2005 the IMO started to limit the sulphur content of maritime fuel, especially in “emission-control areas” along heavily populated coasts in North America and Europe. These limits are set to be tightened drastically,  Such fuels currently cost about 50% more than unrefined “residual” grades…

Shipping firms are also under pressure to cut their emissions of carbon dioxide and other greenhouse gases. The IMO reckons that ships cause about 2.7% of total man-made emissions, a bit more than planes but a lot less than cars and trucks. Under a convention it has brought into force this year, ships will have to introduce fuel-economy measures with the aim of reducing their emissions by 20% by 2020 and 50% by 2050….

The IMO is also pressing on with planned new rules on cleaning up ships’ ballast water. These may come into effect this year, once enough national governments have signed up for them. A study last year in the Journal of Marine Engineering and Technology* reckoned that around 60,000 ships worldwide would need refitting with one or more cleansing units, costing up to $1.7m each. In that case, shipping firms could be whacked with a bill of the order of $50 billion…

New proposals to make shipping greener, and push it further into the red, keep popping up. This week the European Parliament’s environment committee backed proposals for recycling levies on vessels calling at EU ports. This would pay for safer scrapping of old ships, which can contain asbestos and other toxic materials….

At a conference in Athens recently John Platsidakis, a Greek shipping boss who chairs an association of bulk-cargo operators, grumbled: “We carry 90% of world trade and we emit only 2.7% of the CO2 but still we are treated as if we are acting with indifference to the environment.”…[A]irlines, for example, have lobbied more shrewdly than shipping firms. But then again, the shipping industry is bigger and more fragmented than aviation, making it harder for it to present a united front. Many small, family-owned shipping firms have publicity-shy bosses and lack the sophisticated public-relations machines that giant firms deploy….[T]he ICS seeks to represent the entire global merchant-shipping fleet with just 20 people. The industry’s sluggish lobbying has meant that rules get passed before it has a chance to object to them. And once they are passed, it is much harder to get them changed.

The shipping industry: Sinking under a big green wave, Economist, Mar. 30, 2013, at 69