Henk Bouwman, North-West University
Plastic is everywhere. It is used across a spectrum of applications from durable industrial equipment, household appliances to throw-away single-use items and even the clothes we wear. This wide scope of uses is ascribed to its versatility, low-cost and because it’s extremely durable.
But its properties also make it a problem. Because it’s so durable the lifespan of a plastic product is often much longer than the time it is in use for. This is especially the case for single use plastics like straws, bottles and bags. A plastic bag has an average usage time of 20 minutes, while it can take up to 1000 years to break down in the environment.
These large plastics are an environmental hazard. They entangle animals, cause damage to their respiratory surfaces, block their digestive tracts and can cause them to starve to death.
Although macroplastics are a clearly visible environmental pollutant, they are only part of the problem. Recent research has shown microplastics to pose a much bigger pollution threat than previously thought.
Microbeads, like plastic bags and water bottles, are also a form of single use plastic. But, because they aren’t visible, are often disregarded. In recent years, scientists have found them in deep oceanic water, remote lakes, ground water and even drinking water. They are dangerous as the tiny particles take up harmful chemicals from the environment and, when ingested, act as carriers for pollutants into our bodies.
The problem is microplastics are difficult to get rid of because they’re so small and are found nearly everywhere. The best tactic to fight this pollutant is therefore to reduce the amount of plastics entering the environment.
Microplastics have two sources. They can be produced to be microscopically small – like microbeads in cosmetic products. These are tiny round plastic beads, ranging from about a hundredth of a millimetre to one millimetre, that are used to scrub skin for a minute or two before being washed into the environment where they can stay for up to 10 000 years.
But most microplastics result from the breakdown of larger pieces of plastic that were not recycled and break up due to exposure to the sun or physical wear.
Many countries have come to realise the dangers of these microplastics and are taking action. A number have banned the use of microbeads in cosmetic products. These include Canada, the US, United Kingdom, France, Sweden, Taiwan, South Korea and New Zealand.
And in 2018, 57 brands joined the “Look for the Zero” campaign which pledges that no plastics are added to products.
In Africa, a number of countries have also started taking action against plastic pollution, with countries like Burundi, Benin, Cameroon, Ivory Coast, Chad, Morocco, Rwanda and Kenya placing a ban on single use plastic bags.
South Africa put a levy on plastic bags in 2002, but while it hasn’t proved to be very successful as plastic bags are a leading environmental plastic pollutant, it is now considering a microbead ban. This would promote incentives against plastic pollution and encourage other countries to follow suit against a relatively easily removable source of plastic pollution. Many South African cosmetics companies have already committed to keep microbeads out of their products.
Measures to address the global plastic problem can place a heavy economic burden on developing countries. Because of plastic’s low production cost and usefulness as a packaging material, alternatives for single use plastics are usually expensive and places environmental pressure on other resources.
Microbeads could be a low hanging fruit in the fight against global plastic pollution. It would be easy to remove them and to replace them with more environmentally friendly alternatives like Jojoba beads, ground oats, almond shells and coffee. Emphasis should also be placed on methods of exfoliation other than physical abrasion, like enzyme and acid exfoliation.
The plastic pollution problem is an extremely complex issue and each country with unique socioeconomic makeup needs to tackle it to its own capacity.
Carina Verster from the Unit for Environmental Sciences and Management at North-West University also contributed to this article.
Henk Bouwman, Research Professor Ecotoxicology, North-West University
This article is republished from The Conversation under a Creative Commons license. Read the original article.