Lead-acid batteries are everywhere—inside most electric vehicles, powering conventional ones, and acting as backup storage in places that can’t always rely on the grid. But there’s a less visible side to the metal. When used batteries are recycled in informal smelting setups without pollution controls, lead can seep into nearby soils and linger for thousands of years.
Misryoum newsroom reported on a study that zeroed in on a practical question: if you can’t stop the exposure overnight, can you at least clean up the damage? In a Bangladeshi town, researchers scraped lead-contaminated soil near an abandoned recycling site and treated it with phosphate, finding a 22% reduction in blood lead levels (BLLs) in children living nearby.
The work focused on two abandoned used lead-acid battery (ULAB) recycling sites in Tangail District, Bangladesh, abandoned in early 2019. Misryoum editorial desk noted that the researchers analyzed BLLs of 130 children living close to those two sites, and also compared against 37 children living farther away from any ULAB recycling site. Community trust was part of the design too: the team held informational sessions so locals could give informed consent to participate. One mom—small detail, but the kind you don’t forget—made tea while the session was going on, and you could almost hear the steady, ordinary clink of cups as the discussion turned toward something that doesn’t sound ordinary at all: lead.
After remediation, the soil’s lead content in and around the former recycling site dropped sharply, from more than 20,000 parts per million to less than 400 parts per million. That value was considered acceptable by the U.S. EPA when the study was conducted, from 2022 to 2023—though Misryoum newsroom can’t ignore the update that the limit was reduced to 200 parts per million in 2024. The researchers collected and cleaned soil from children’s play areas, roadsides, and courtyards across 68 households assigned to the intervention group. Then, a year later, the 89 children from those households showed the biggest improvements: BLLs fell from 90.1 to 70.4 micrograms per liter, a decrease of more than 21%.
Children near the second abandoned ULAB site, where no soil remediation was done, experienced only about an 8.4% decrease in their BLLs—from 88.5 to 81.1 micrograms per liter. Misryoum analysis indicates that the control-group reduction may have been influenced by a government initiative targeting lead levels in turmeric, happening over the same time window as the study. It’s a reminder that lead exposure isn’t always coming from one place, and sometimes a second factor quietly moves the baseline while you’re trying to measure change.
Even with the gains, the study still lands in worrying territory. The children’s BLLs were well above the World Health Organization’s threshold of 50 micrograms per liter. Rahman said this could point to other sources of lead exposure—like paints and cookware—or to the stubbornness of long-term lead exposure, where lead deposits deep into bones and continues to affect the body even after someone moves away. In other words, cleaning a site helps, but it may not fully “switch off” the problem for everyone.
That limitation is part of why the bigger policy challenge remains. Soil remediation can work, but it’s labor-intensive and expensive, and it’s not feasible to redo every contaminated site. Rahman emphasized that the issue is widespread because informal recycling is cheap; that keeps the formal sector from investing in costly pollution controls. Similar studies in Brazil and Bangladesh have reported 46% and 35% reductions, respectively, after soil remediation around ULAB recycling sites. The pattern suggests a real lever exists—just not one that’s easy to pull at scale, especially when the harm has been accumulating for years, maybe decades, right under people’s homes.
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