Waste Management

Gloves Off: How Effective Are Gloves at Preventing the Spread of COVID-19?

/ Small Change / Leave a comment

The month of March is when Spring begins. For many, this March was the beginning of something much more sinister. We were terrified, and rightly so, by the emergence of the novel coronavirus COVID-19. Now, half a year later, not only are we still fighting the virus, we are also fighting the wave of people who believe that the virus is a hoax. But even those of us with good intentions have created new evils.

This Spring brought with it the familiar sight of brightly coloured patches appearing in our fields and meadows. You must have seen them, the brilliant blues and pure, snowy whites. Look closer; they are not flowers. Every day, we are throwing away millions of disposable masks and gloves, many of which end up contaminating the natural world.

If you don’t have a few cloth masks by now, you are behind the game. Not only do they save you money in the long run, they are also better for the environment and more comfortable. It has been shown time and time again that masks are very effective at preventing the spread of respiratory illnesses. I’m sure you know this, but you should be wearing one every time you are in public. That much is no longer up for debate.

The same, however, cannot be said for gloves. There is a real chance that we are throwing billions of gloves into our rivers and seas for no reason. The WHO, HSE and CDC have all released statements which tell us that there is no evidence that gloves are effective in preventing the spread of COVID-19 in the general public.

Medical professionals are constantly touching contaminated surfaces and coming into contact with infected people. They are truly on the front line. For the most part, medical professionals only use gloves when there is a risk of coming into contact with a patient’s bodily fluids. Other uses would include surgery or if there is a chance of injury, for example, from a needle. Unless you are taking care of someone who is either vulnerable or infected with COVID-19, there is no benefit to wearing them.

Source: WHO

What’s more, medical professionals have been trained in how to effectively use, remove, and dispose of gloves. They know how frequently the gloves must be disposed of, and they know to be careful what they touch when their gloves may be contaminated. In other words, they are aware that it is not in any way a substitute for hand hygiene. In the medical profession, the use of gloves is absolutely necessary. For everyone else, however, it is a somewhat different story.

When you touch a contaminated surface, the virus transfers from the surface onto your hands. That is true whether you are wearing gloves or not. It doesn’t matter whether the virus is on your skin or the gloves. In both cases if you touch another surface, you transfer the virus to it. In both cases if you touch your eyes, nose or mouth, you can become infected.

When you take off a pair of contaminated gloves, the virus can easily transfer onto your skin. It is recommended, then, that you wash your hands every time you remove a pair of gloves. Do you see the problem here? It is cheaper, better for the environment and in fact more effective to simply cut out the middleman and wash your hands. You are adding an unnecessary extra step to the process; one which contaminates our rivers and seas.

Source: CDC

Wearing gloves gives people a false sense of security. We think we are protected, but in fact we are just as vulnerable to infection. If you are not wearing gloves, you are more likely to wash or disinfect your hands because you know the virus might be on your hands. When we think we are protected, we become complacent. What’s more, when you contaminate a pair of gloves and then throw them away, you have created a new surface for the virus to live on. That creates a new risk for the sanitation workers who have to pick the gloves up off the ground and dispose of them. The same problem does not happen when you wash your hands instead.

Source: HSE (https://www2.hse.ie/conditions/coronavirus/face-masks-disposable-gloves.html)

Another consideration is that when the general public uses vast amounts of medical gloves, they create a shortage for the people who actually need them: medical professionals. As was the case with hydroxychloroquine, uninformed panic has caused people to unnecessarily deplete necessary resources, to the detriment of doctors and hospital patients.

What happens when we have poisoned our oceans with so much plastic that the ecosystems within begin to break down? Plastic pollution has been shown to reduce the efficiency of the process in the oceans which transports CO2 from the atmosphere to the sea floor. That is worrying, since right now the ocean takes up about 30% of the atmospheric fossil fuel CO2 each year.

What’s more, 70% of all the oxygen on earth is produced by marine plants which include phytoplankton: small photosynthesising organisms in the oceans. The most abundant photosynthesising organism on earth, Prochlorococcus, has been shown to reduce oxygen production when exposed to the chemicals which leach out of plastics in the sea.

That is aside from the better-known impacts of plastic pollution, like those which occur when marine animals ingest or are entangled in plastic. If for whatever reason you are still using disposable face masks, make sure to cut the straps to prevent entanglement.  

Not only do animals ingest plastics, we ingest them too! A recent study tested 47 tissue samples from human organs and found that every single one of them contained plastic. We are creating a massive crisis for the future in the name of halting the current one, and it is not even helping. As good as our intentions may be, the use of gloves to combat COVID-19 may well be costing more lives than it is saving. If that’s true, why do it?

People are wearing gloves because they are scared and because they want to do everything they can to slow the spread of this deadly virus. That is admirable. We should be scared, and we should be doing everything we can to help. This virus is very real and very dangerous. The problem is that gloves likely don’t help, and they create new problems.

If you feel you must use gloves, you have to make sure that you change them as frequently as you would wash your hands. Do not touch your face while wearing them and be ready to take them off the moment you think they have been contaminated. The best way to remove them is to roll them down from the wrist, since this turns them inside-out, reducing the amount of contact between your hands and the surface of the gloves. You also need to make sure that you wash your hands when you take the gloves off or risk contaminating your hands.

Win Win Win Win: The Magic Science of Plasma Waste Converters

/ Small Change / 10 Comments

First Published in the UCD College Tribune

Humans have an incredibly extensive waste problem. Right now, most of that waste is sent to landfills where it takes up space for thousands of years, leaching harmful chemicals and gases into the soil and atmosphere. Alternatively, we send our waste to incinerators which burn it for energy, but which release harmful greenhouse gases (GHGs) and toxic by-products in the process. A large proportion of our plastic waste ends up in the ocean, where it strangles and poisons fish, seabirds and marine mammals. What if I told you that there was a way to get rid of almost any type of waste in one machine, that the machine would release no harmful chemicals or GHGs, and that the process would produce useful by-products and excess energy that could be sold back to the grid? Such a machine exists right now; the plasma waste converter (PWC).

While incinerators are able to extract about 15% of the potential energy from rubbish, PWCs can extract an incredible 80% through a process called ‘gasification’. Plasma is ionised gas, meaning that it contains roughly equal numbers of positively charged ions and negatively charged electrons. It is often called the fourth state of matter since its characteristics are so different to those of liquids, solids and gases.

One way you can make plasma is by creating an arc of electricity between two rods, then passing a gas like argon through it. This set-up is known as a plasma torch and can heat gases to a higher temperature than the surface of the sun. Plasma torches were invented by NASA in the 60s to test how much heat the hulls of their spaceships could withstand. The crucial difference between using a plasma torch and using an incinerator is that in PWCs, combustion doesn’t take place. That means no smoke, no GHGs and no ash. The plasma breaks down the bonds between atoms, separating them into very simple forms. Despite the extremely high temperatures, it would be wrong to say that the waste is being ‘burned’; rather it is being decomposed at an accelerated rate.

One of the products of gasification is, you guessed it, gas. This energy-rich gas, known as syngas, is largely made up of hydrogen and carbon monoxide. Syngas mainly comes from the gasification of organic matter. As the gas expands, it spins a turbine, generating electricity. The high temperature of the gas can also be used to evaporate water, generating steam to turn another turbine. The syngas itself can then be burned for fuel or scrubbed with water and released safely. Remember, all of this energy production and revenue is coming from rubbish. We are talking about the plastics that are decimating marine life. Metals, fabrics, wood, even toxic or hazardous waste from industrial run-off or medical facilities. This is stuff that we desperately need to get rid of and by getting rid of it like this, we can also take some of the stress off an already strained energy production sector.

The solid by-product of gasification is called ‘slag’. Slag is produced mainly from inorganic materials like metals. It can be used in construction to bulk up concrete and tarmac, making it a very useful commodity. The molten slag also pools at the bottom of the chamber and helps to maintain the temperature, reducing the energy consumption of the PWC. The real magic happens when you pass compressed air through molten slag to create a material known as ‘rock wool’. Rock wool is currently made by drilling into rock, melting it down and spinning it in a centrifuge. Made in this way, rock wool is sold at one US dollar per pound. When it’s made of rubbish instead, it can be sold at just ten cent per pound.

Rock wool can be used in a number of ways. As an insulation material, it is twice as efficient as fibreglass and could significantly decrease heating and air conditioning bills, further reducing the carbon footprint of gasification. Surprisingly, you can also hydroponically grow plants from seed in rock wool. Perhaps its most amazing use is that it can clean up oil spills. Rock wool is lighter than water and extremely absorbent. This means that if you spread it out over the surface of an oil spill, it will float and absorb all the oil. The rock wool can then be collected with relative ease. Slag and rock wool are two more saleable products that can increase the economic viability of plasma waste conversion.

PWCs are currently being built all around the world. Some plants are already so efficient that they need to take rubbish out of landfills to use as feedstock. There is even a mobile plasma torch on the back of a truck in the US which can be jammed straight into landfills, which act as makeshift gasification chambers. The need to reduce GHG emissions and simultaneously fix our massive waste problem has generated huge interest in PWCs in recent years. Landfills have only one way to make money; they charge you a ‘tipping fee’ for getting rid of your waste. Since PWCs can generate revenue from both energy production and by-products, they can make their tipping fees much more competitive.

So why haven’t these things solved the problems of pollution and climate change already? The answer is largely that PWCs are still a relatively new technology. The cost of building and operating one is still much higher than that of some of its competitors including landfills and incinerators. There has not yet been standardisation of the design and thus the huge and complex machinery must be custom-built every time. The energy needed to power PWCs is also very high, especially compared to incineration, which requires only a match. It must be said, however, that although it takes a lot of energy to run a PWC, you will very quickly make all that energy back and more. PWCs are extremely efficient long-term; unfortunately, short-term profits dictate much of what happens in society.

One worry is that by making waste a profitable commodity, we encourage people and companies to keep polluting with impunity. The best way to solve pollution is not to pollute more and then clean it up better. It is to reduce the amount of pollution we are producing, whether that is by reducing our individual consumption, or by researching innovative ways to package our goods without making a mess. There is, on the other hand, already a lot of waste out there, languishing in landfills and contributing to the decimation of marine ecosystems. The best thing to do with all that waste is to get rid of it with the fewest possible emissions and the most possible benefits. PWCs may be just the technology for the job.

The price of fossil fuels is slowly being raised by various economic policies to reflect the cost to life on earth and we need to find as many alternative sources of energy as we can. With countless landfills already full and the world still producing around 2 billion tonnes of waste per year, rubbish will not be scarce for a very long time. This really is a win win win win win. One machine can get rid of harmful waste, cut GHG emissions, produce fuel, energy and construction materials and clean up oil spills all while making a profit. An investment in plasma waste converters is not only economically sound, it is also an investment in the future of our planet.

The New Frontier: Plastic Pollution in the Ocean

/ Small Change / 3 Comments

Every minute, the equivalent of a truckload of plastic enters the sea. Since 2004, humans have produced more plastic than we did in the previous 50 years combined. As the global population rises, our need for cheap and sturdy materials rises with it. The problem with plastics is that they are too sturdy. Every piece of plastic ever produced still exists somewhere in the world. Once the plastic has finally disintegrated, that is by no means the end of the problem. Plastics in the ocean break down into tiny particles known as microplastics. Such particles are found throughout marine ecosystems; from the stomachs of fish, to the stomachs of the seabirds who eat them.

Microplastics are not only dangerous, but also extremely difficult to clean up since they are spread out by currents all across the sea. In order to be classified as a microplastic, a piece of plastic debris must be roughly the size of your little fingernail or smaller. There are over 320 million cubic miles of water in the world’s oceans. For a sense of scale, you could fit roughly 320 million cars into a single cubic mile. Scientists have estimated that there are up to 50 trillion pieces of microplastics in the oceans. Given these figures, to say that removing microplastics from the ocean is no easy task would be the understatement of the century.

The reason that high levels of plastic in the ocean are problematic is that plastics have serious detrimental effects on the health of almost all ocean life. Over 800 species of animals have so far been shown to be negatively affected by plastic pollution. Considering that number was closer to 600 in 2012, it is safe to assume that the figure will continue to rise dramatically in the coming years. What’s more, almost 20% of the animals shown to be affected by plastic pollution are already classified as endangered due to human activity. There are two major ways in which plastics can harm or kill marine life. First, they can be ingested. When marine animals ingest plastic, the pieces can remain in their stomachs for the rest of their lives. As the amount of plastic increases, the space remaining in the stomach decreases, causing the animal to starve. In addition to this, most plastics are toxic to animal life, causing conditions like cancer and birth defects. Second, marine animals can become entangled in the plastic. If this happens at a young age, the plastic can restrict the growth of the animal, causing them to become severely deformed. This is seen most often in sea turtles. The worst offenders when it comes to entanglement are pieces of discarded fishing gear.

The phenomenon of marine life being caught by gear that has been abandoned by fishermen is known as ‘ghost fishing‘. Nets, hooks, lines, and cages continue to catch and kill fish long after the fishermen have stopped using them. Roughly 30% of all fish that are caught by humans are caught in ghost fishing gear. When you consider the sheer scale of human fishing, this percentage is astonishingly high. Leaving plastic fishing gear in the ocean, plastic or otherwise, is both short-sighted and despicable. Fishing gear is specially designed to kill as much marine life as it can. When it is under the control of a fisherman, protected marine life like whales and sea turtles can be avoided or released. Even so, fishing of any sort is devastating to endangered species. When the gear is abandoned, however, there is no targeting of species, leading to indiscriminate destruction of marine habitats.

There have been a lot of stories in the news recently about how companies like McDonald’s and Starbucks are ditching plastic straws. While this is a step in the right direction, straws only account for roughly 1% of the plastic debris in the ocean. In order to make a real difference, the companies would have to stop using plastic straws, containers, bags, cups, lids and everything else. This is a perfect example of what’s known as corporate ‘greenwashing’. If the public perception of a company is that they are trying their best to reduce the environmental damage they are causing, less people will boycott the company’s products, leading to higher revenue. Because of this, companies make the calculated decision to sacrifice a small portion of their profits in order to further their public personas as stewards of the environment. This is not to say that small steps forward like those taken by McDonald’s and the like are not helpful. Carlsberg have recently announced that they are ditching the plastic rings connecting cans in favour of glue dots. This is a positive development, since these connector rings have been shown to strangle and stunt the development of marine life and seabirds.

Plastic is not distributed evenly throughout the ocean. There are 5 major places, known as gyres, where currents have forced plastics to accumulate into huge expanses of debris. The largest of these gyres is called the great pacific garbage patch (GPGP) and contains about 2 trillion pieces of plastic. That’s 250 pieces of plastic for every human on earth in just one place. The GPGP is around the size of Texas and weighs about the same as 500 jumbo jets. The accumulation of plastic in gyres like the GPGP makes it somewhat easier to clean up oceanic plastic, but it is still a monumental challenge.

When he was just 17, Dutch aerospace engineering student Boyan Slat devised a huge U-shaped machine to clean up the GPGP that he believes could clear 50% of the plastic in just 5 years. The device uses ocean currents to move with the plastic, but since it is largely above the surface, it moves faster than the plastic, gathering it as it goes. It was deployed in the gyre in September of last year but was immediately faced with a slew of setbacks. The device was not travelling fast enough, allowing some of the plastic to escape, then a 60-foot section of the machine broke off, meaning that it had to be brought back to shore for repairs. Another issue with the device is that it cannot collect microplastics. However, it is important to gather up as many of the large pieces of plastic as we can now, since they will become microplastics in the future which will be much more difficult to clean up. We are in full damage control mode.

Despite valiant attempts to reduce our plastic consumption and remove the plastic we have already dumped in the ocean, it is highly unlikely that this problem will be solved any time soon. If anything, it will get much much worse. Humans have a history of showing up at a new location and decimating the native wildlife populations. When we first arrived in Australia, huge animals roamed the land. These included a 2-and-a-half-ton wombat, a flightless bird twice the size of an ostrich, and a predatory marsupial the size of a tiger. Within a few thousand years of humans showing up, 23 of the 24 animals that weighed over 50 kilograms had become extinct. We have spread all over the planet now, leaving only a few havens in which animals may thrive. The new frontier of animal extinction is marine life. Plastic pollution, overfishing and ghost fishing have devastated marine life and seabirds already, and the rate of destruction is only going to increase. All we can hope for is that people wake up to the genocide we are committing under the waves in time to save at least some of the majestic creatures who call the sea their home.