Incinerating oceans of plastic: Ace Waste

As the medical industry examines its waste generation and recycling practices, Waste Management Review explores incineration as a solution for non-recyclable plastic.

When speaking with Australian media in September, Peter Thomson, the United Nations’ top envoy for the world’s oceans, compared the fight against plastic pollution to the fight against big tobacco.

Plastic has become so ubiquitous in the natural environment that United Nations scientists suggest it could serve as an indicator of the Anthropocene and lead to a reengineering of the planet.

While extreme, the statement is not without merit. A Project MainStream report, for example, suggests material in the ocean could outweigh fish by 2050, with an estimated eight million metric tonnes entering the world’s oceans every year.

In 2018, an Australian senate inquiry into the waste and recycling industry recommended a ban on all single-use plastics by 2030. Similarly, on the other side of the globe, members of the European Parliament earlier this year voted to ban the material by 2021.

Though initiatives like this are a step in the right direction, associated conversations regularly focus on seemingly frivolous consumer items such as coffee lids, straws and plastic bottles. However, as plastic’s chemical composition lends itself to sterility, it is also a necessary material for the medical industry.

For generations, plastic has been used to manufacture IV drips, syringes, bandages, garments, surgical covers and other indispensable medical products.

One of the most commonly used plastics in the medical industry is polypropylene, which is used to make syringes, pouches, test tubes and beakers. While it is recyclable, state and territory health regulations require it to be disposed of post-use.

Problems stemming from the inadequacy of disinfection methods lead to much of this material ending up in landfill or, as is sometimes the case, the natural environment.

A key issue is a lack of material substitutes for clinical products, meaning the use of single-use plastics in the medical industry is largely unavoidable.

Princess Alexandra Hospital (PAH) in Woolloongabba, Queensland is one of many Australian hospitals attempting to address the issue by introducing proactive reduction and recycling initiatives.

Brendon Seipolt, PAH Operational Services, says the hospital’s actions include recycling programs for PVC, soft plastics and kimguard (a form of sterilisation wrap) and the introduction of sugar-cane-derived, biodegradable kidney dishes.

Brendon says these initiatives led to a 600,000-kilogram waste reduction in 2018. Despite this, much of the waste PAH produces is non-recyclable, namely contaminated clinical soft plastic. To handle the material, PAH engaged clinical waste incineration specialists Ace Waste.

“PAH produces an average of 700,000 kilograms of clinical waste per year that requires incineration, in keeping with safety and quality practices,” Brendon says.

“This is a significant reduction of over 200,000 kilograms since 2012, through an ongoing program of appropriate waste identification and disposal.”

Alexander Homewood, Ace Waste Executive Director, says that while sustainability programs like those implemented by PAH and other medical facilities are important, recycling alone cannot sufficiently address the plastic problem.

“In the medical industry, the spectre of non-recyclable plastics is complex, with the reality of infection control and single-use necessity challenging the notion that recycling and landfill are the only waste management mechanisms available,” Alexander says.

He adds that conservative estimates suggest 30 per cent of all clinical waste is non-recyclable contaminated plastic.

“Ace Waste works with the PAH and other health clients throughout Queensland and Victoria to manage the second part of the equation, and in doing so close the loop with a service that destroys everything through incineration,” Alexander says.

“Ace Waste’s high-temperature incinerators present a viable alternative by completely destroying infectious materials, which stops it from entering the ocean, while also ensuring pathogens are unable to enter the ground or atmosphere.”

In addition to destroying the material in its entirety, the Ace Waste incineration process creates a high-calorific energy source.

Incineration plants generally require natural gas to maintain combustion. However, Alexander says the high plastic content of clinical waste streams means Ace Waste’s incinerators produce enough energy to independently maintain combustion conditions.

“Contaminated plastic in clinical waste produces 28 megajoules per kilo of heat energy, and by comparison coal produces 32,” Alexander says.

“By burning contaminated non-recyclable plastic, Ace Waste is generating significant amounts of energy from a material source that usually ends up in landfill or worse, in the ocean.”

While avoidance and recycling are the key drivers towards positive environmental outcomes, society can’t ignore the reality of waste generation in the medical industry.

“We need to understand that some waste is unavoidable, and rather than turning a blind eye, should consider disposal methods that support the overall goal of a more healthy and sustainable future,” Alexander says.

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High Temperature Incineration: Ace Waste

Waste Management Review talks to Metro North Hospital’s Waste Manager Gregg Butler about clinical waste regulations and the benefits of high temperature incineration.

Becoming one of the healthiest communities in the world by 2026 is the official vision of the Queensland Health Department.

To achieve this outcome, the department is committed to ensuring available resources are used efficiently for future generations, according to the department’s 2018-20 Waste Reduction and Recycling Plan.

To attain desired sustainability, the department has repurposed the waste hierarchy to highlight the importance of waste reduction and recycling within hospitals.

Brisbane’s Metro North Hospital and Health Services Environment and Waste Manager Gregg Butler, who has worked in the health sector for over 40 years, is at the forefront of rethinking waste in the industry.

“Over the years, Metro North have worked to install all sorts of waste management initiatives throughout our facilities,” Gregg says.

Metro North initiatives include the “Know Which Bin To Throw It In” campaign, which educates staff on correct waste segregation and the tube terminator, a machine that destroys lightbulbs to reduce the impact of mercury in landfill.

“The money we save through recycling and waste reduction initiatives allows us to buy new equipment such as hospital beds, which is beneficial for the community,” Gregg says.

While the waste hierarchy privileges avoidance and reduction, hospitals by their very nature generate a significant amount of waste that cannot be recycled.

“Recycling what we can is important, but a lot of hospital waste is hazardous and needs to be disposed of responsibly, namely clinical waste,” Gregg says.

Clinical waste is an unavoidable waste stream with limited diversion and processing methods. It is generally defined as any waste with the potential to cause disease, including discarded sharps, human tissue and laboratory waste.

Standard Australian destruction practices fall largely into two camps, autoclave and incineration.

“I don’t like treating clinical waste though autoclave because as far as I’m concerned, it doesn’t get rid of the pathogens and some of the needle and blood products,” Gregg says.

“Ace Waste are the only ones with incinerators in Queensland, and in my personal opinion, incineration is the way to go.”

To process its clinical waste, Metro North work closely with family owned medical waste disposal company Ace Waste.

Ace Waste was founded in 1987 in response to the need for a professional clinical waste collection and disposal service. The company provides hospitals, healthcare facilities and other businesses with safe waste collection, storage and disposal services.

Additionally, Ace Waste offers secure transportation and high temperature incineration at their Brisbane treatment facility, located at Willawong.

“Metro North have had a relationship with Ace Waste since they were established in the late 80s,” Gregg says.

“We choose to work with Ace Waste specifically because they incinerate, which I consider the most appropriate disposal method for clinical and related toxic waste.”

According to Gregg, when medical waste regulations came into effect in 1994, Ace Waste were already compliant.

As per the Queensland Government’s clinical and related waste policy, hospital waste must be handled, stored, and transported appropriately to minimise the potential for contact. Additionally, prior to disposal at landfill, all clinical waste must be treated.

While incineration renders the waste unrecognisable, the bi- product in the form of residual ash still requires disposal at a regulated waste disposal facility, which Ace Waste facilitates.

“They can handle anything clinically related as far as regulations go, blood products, cytotoxic waste, chemical waste,” Gregg says.

“They take roughly 80 to 90,000 kilograms from Metro North every month, which is substantial, and they have the know how and capacity to dispose of it safely and efficiently.”

The Ace Waste incineration process involves loading waste into a primary chamber and incinerating it at temperatures between 1000 °C and 1150 °C. The exhaust gas from the secondary chamber is then cooled, before being passed through the air pollution control plant.

The process guarantees the complete destruction of infectious waste materials and ensures pathogens and toxic disease are unable to be released into the ground or atmosphere.

“At those temperatures there is no residue what so ever, which means contaminants won’t turn up in landfill,” Gregg says.

“Additionally, high temperature Incineration converts plastic into energy and is a great substitute for fossil fuels.”

According to Gregg, thermal degradation is a gasification process in essence.

“Not only are volatile plastics used as alternate fuel, the resultant heat destroys pathogens and pharmaceuticals and converts it into carbon dioxide and water,” he says.

Queensland regulations also require clinical waste to be effectively segregated into categories such as chemical waste, human tissue waste and pharmaceutical waste.

“Ace Waste provide appropriate storage bins, which lets staff easily sort waste at the point of disposal,” Gregg says.

“The service has always been A plus with Ace Waste, hence the contracts being renewed over and over again.”

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