This is the reason why some waste materials are more harmful to the environment than others. Leon Grobbelaar, President of the Institute of Waste Management of Southern Africa (IWMSA) says consumers need to be aware of this.
“It’s critical that consumers take cognisance of the pressure that everyday waste items place on the waste disposal infrastructure and ultimately the environment as a whole,” Grobbelaar adds.
Let’s take a look at some common items to see how long they will take to decompose.
A plastic bag can take anywhere from 500 to 1000 years to decompose in landfills. Plastic waste remains one of the biggest environmental burdens posed on coastal and ocean environments. The Ocean Conservancy’s 2018 Coastal Clean-up report1 indicates that during the 2017 effort to clean-up coastlines, plastic bags ranked as the fifth most picked up item. A total of 1 503 734 plastic bags were picked up during the 2017 International Coastal Clean-up day.
A plastic water bottle can take from 70 to 450 years to decompose. Almost every hour, nearly 250 000 plastic bottles are dumped. It is not surprising that plastic bottles constitute close to 50% of recyclable waste at landfills.
Aluminium cans take up to 200 years to degrade. Aluminium is one of the easiest and fastest recyclable materials that can be recycled and reused within 60 days. Preparing aluminium products from virgin metal consumes close to 100 times the power required to recycle aluminium, making recycling the more cost- and energy efficient option.
Milk cartons are made with paperboard, as well as an insulating layer of polyethylene plastic and a dash of shelf-stable-friendly aluminium. When thrown away, milk cartons take approximately five years to decompose.
Disposable diapers can take 500 years to decompose. Apart from the negative effects on the environment due to how long it takes to decompose, diaper manufacturing also contributes to energy waste and pollution due to the large amounts of water and energy used in the manufacturing process.
Separation at source
“Considering the long periods required for decomposition of these everyday waste items, we encourage households to separate their waste so that it can be recycled and diverted from landfill,” says Grobbelaar. “
Your recycling system does not have to be complex, you can simply start by separating wet and organic waste (food and garden waste); plastics and glass; and paper into three separate bags or containers.”