Most U.S. municipal solid waste incinerators are at least 25 years old, and some have been running for more than 40 years.

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Ana Baptista is assistant professor of environmental policy and sustainability management at The New School. This article was originally published on The Conversation. Read the original article.

Research on direct health impacts of waste incineration in the United States is limited, but a handful of studies from Asia and Europe, where waste incinerators are prevalent, offer some insights. For example, a 2013 study in Italy analyzed the occurrence of miscarriages in women aged 15-49 years residing near seven incinerators in northern Italy’s Emilia-Romagna region, and found that increased particulate emissions from the incinerators was associated with an increased risk of miscarriage.

Today, thanks to the evolution of waste handling options, a majority of the materials in municipal solid waste can be composted or recycled. This reduces impacts on the environment, including air, soil and water contamination and greenhouse gas emissions. As cities like New York and San Francisco adopt zero-waste policies that create incentives for diverting waste from landfills or incinerators, burning trash will increasingly become obsolete.

I recently co-authored a report that describes signs of decline in the U.S. waste incineration industry due to many factors. They include a volatile revenue model, aging plants, high operation and maintenance costs, and growing public interest in reducing waste, promoting environmental justice and combating climate change.

Incinerator

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Solid waste

Waste incinerators are heavily concentrated in northeast states and Florida – areas with high population densities and limited landfill space. Some of these states also provide favorable economic incentives, such as allowing incinerators to earn renewable energy credits for generating electricity.

Left: The Wheelabrator Waste to Energy Plant in Saugus, Massachusetts, has been burning trash to generate electricity since 1975. Photo via Fletcher6/Wikimedia, CC BY

Operations and maintenance costs typically increase as plants age and their performance decreases. Upgrades, such as installing new pollution control equipment, can cost tens of millions of dollars, and sometimes more than US$100 million.

Incinerators release many air pollutants, including nitrogen oxides, sulfur dioxides, particulate matter, lead, mercury, dioxins and furans. These substances are known to have serious public health effects, from increased cancer risk to respiratory illness, cardiac disease and reproductive, developmental and neurological problems. According to recent figures from the waste industry, incinerator plants emit more sulfur dioxide, nitrogen oxides and carbon dioxide per unit of electricity generated than power plants burning natural gas.

Waste incineration plant

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incinerator中文

The composition of municipal solid waste has changed over the past 50 years. Synthetic materials such as plastics have increased, while biogenic, compostable materials such as paper and yard trimmings have decreased.

For each pollutant, at least 8 of the 12 incinerators with the highest emission rates nationwide were located in environmental justice communities

Burning trash has a long history in the United States, and municipal solid waste incinerators have sparked resistance in many places. As an environmental justice scholar who works directly with low-income and communities of color, I see incineration as a poor waste management option.

Incineration plants’ average life expectancy is 30 years. Three-quarters of operating waste incinerators in the United States are at least 25 years old.

Hazardous waste

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In the past year environmental justice advocates have successfully shut down incinerators in Detroit, Michigan, and Commerce, California. The Detroit incinerator was built in the 1980s and received more than US$1 billion in public investment borne by local taxpayers. Groups such as Breathe Free Detroit and Zero Waste Detroit rallied residents to oppose the public financing and health burdens that the facility imposed on surrounding environmental justice communities. The plant closed in March 2019.

Combustion

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These facilities’ revenues come primarily from tipping fees that waste haulers pay to dump trash, and secondarily from generating electricity. These revenue streams are volatile and can undermine the industry’s financial stability. At least 31 incinerators have closed since 2000 due to issues such as insufficient revenue or inability to afford required upgrades.

Treatment of solid waste

A single incinerator may burn anywhere from a few hundred tons to several thousand tons of waste per day. Smaller incinerators typically have lower absolute emissions but can emit more hazardous pollutants for each ton of waste they burn. Plant emissions also can vary widely based on the heterogeneous composition of municipal waste, the age and type of emissions control equipment, and how well the plant is operated and maintained over time.

Landfill

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Nonetheless, 72 incinerators are still operating today in the U.S. Most of them – 58, or 80% – are sited in environmental justice communities, which we defined as areas where more than 25% of residents are low-income, people of color or both. Incinerators worsen cumulative impacts from multiple pollution sources on these overburdened neighborhoods.

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Plastics are particularly problematic for waste handling because they are petroleum-based, nonbiogenic materials. They are difficult to decompose and release harmful pollutants such as dioxins and heavy metals when they are incinerated.

Although these plants generate electricity from the heat created by burning trash, their primary purpose is waste disposal. Emissions from burning waste worsen environmental inequalities, create financial risks for host communities and reduce incentives to adopt more sustainable waste practices.

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Many U.S. cities and states are adopting aggressive climate change and sustainability goals. Waste reduction and diversion will play a critical part in meeting these targets. The public is increasingly demanding more upstream solutions in the form of extended producer responsibility bills, plastic bans and less-toxic product redesign. There is also a growing movement for less-consumptive lifestyles that favors zero-waste goals.

These large capital expenditures represent risks for host communities, which often provide public financing through bonds or tax increases. Such measures are risky because the waste service and energy contracts that generate revenue are increasingly shorter term and vulnerable to fluctuating market and regulatory conditions. As plants age, their environmental performance may also degrade over time, posing increasing risks to the environment and public health.

The California plant closed in June 2018 after a yearlong campaign by two community-based organizations, East Yard Communities for Environmental Justice and Valley Improvement Projects, to prevent incineration from qualifying for state renewable energy subsidies. The facility ultimately closed when a 30-year power purchase agreement with the local utility expired, leaving it without a sufficient revenue stream.

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