Case Studies 2025: Successful Industrial Use of Desulfurizers

Nestled in the heart of Ohio, GreenCycle Solutions has been a cornerstone of the region's lead acid battery recycling efforts for over a decade. Processing 500 tons of scrap batteries daily, the plant plays a vital role in recovering lead, plastic, and acid for reuse. But by early 2024, their aging desulfurization system was showing its age. "We were drowning in maintenance issues," recalls plant manager Raj Patel. "The old unit broke down at least twice a month, spewing SO2 emissions that sometimes exceeded EPA limits. Our team was constantly scrambling to fix leaks, and we were bleeding money on replacement parts."

The problem wasn't just compliance—it was efficiency. The outdated de-sulfurization machines struggled to keep up with the plant's lead acid battery breaking and separation system, which had been upgraded two years prior to handle higher throughput. "We could process more batteries, but the desulfurization step became a bottleneck," Patel explains. "We'd have to slow down the line to avoid overwhelming the system, costing us valuable production time."

Determined to turn things around, GreenCycle partnered with a leading recycling equipment supplier to install a state-of-the-art de-sulfurization machine. The new unit, designed specifically for lead acid battery recycling equipment, featured automated pH monitoring, a high-efficiency scrubbing tower, and modular components for easy maintenance. "The difference was night and day," Patel says. "Installation took just three weeks, and from day one, we noticed a change. Emissions plummeted, and the system ran like clockwork."

By integrating the desulfurization machine with their existing lead acid battery breaking and separation system, GreenCycle achieved remarkable results:

"We're now in full compliance with EPA standards, and our team's morale has skyrocketed," Patel notes. "No more emergency repairs, no more stress about inspections. The desulfurization machine didn't just fix a problem—it turned a liability into an asset."

Out west, in the desert of Nevada, VoltRecycle operates one of the largest lithium-ion battery recycling plants in the country, processing 2000 kg of Li batteries per hour. While lithium battery recycling equipment is designed to recover valuable metals like cobalt and nickel, it also releases a complex mix of pollutants—including sulfur compounds from electrolytes and plastic casings. By mid-2024, the facility was struggling to meet the state's stringent air quality standards, despite using a basic air pollution control system.

"Lithium batteries are trickier than lead acid," says environmental compliance officer Elena Rodriguez. "The emissions aren't just sulfur—there are volatile organic compounds (VOCs) and particulate matter too. Our old system was a one-size-fits-all approach, and it wasn't cutting it. We were getting notices from the state, and our neighbors were complaining about odors."

VoltRecycle needed a solution that could handle the unique challenges of li battery recycling equipment while prioritizing desulfurization. They turned to a supplier specializing in air pollution control system equipment, who proposed a custom-designed setup: a multi-stage system where desulfurization machines acted as the first line of defense. "The idea was to tackle sulfur compounds early, before they could react with other pollutants and become harder to remove," Rodriguez explains.

The new system featured a spray dryer absorber for desulfurization, followed by a catalytic oxidizer for VOCs and a baghouse filter for particulates. "It's like a relay race," Rodriguez says. "Each component has a specific job, and they work together seamlessly." The desulfurization machines, equipped with real-time sulfur monitors, adjusted chemical dosages automatically based on the incoming battery feed—critical for a facility that processes everything from smartphone batteries to electric vehicle packs.

The results were transformative. Within six months, VoltRecycle's sulfur emissions dropped by 98%, and overall air pollutants were reduced by 92%. "We went from being on the state's 'watch list' to receiving a sustainability award," Rodriguez (proudly states). "Workers no longer complain about eye irritation or headaches, and our community relations have improved dramatically. Plus, the system is energy-efficient—we're saving $8,000 a month on electricity compared to our old setup."

Perhaps most importantly, the integrated air pollution control system has given VoltRecycle a competitive edge. "Customers want to work with facilities that take environmental responsibility seriously," Rodriguez notes. "Our desulfurization upgrade has become a selling point. It's proof that we're committed to doing things the right way."

Down in Texas, Lone Star Recyclers operates a sprawling facility that handles a little bit of everything: lead acid batteries, lithium-ion batteries, scrap cables, and even circuit boards. With such a diverse feedstock, their desulfurization needs were all over the map. "One day we're processing lead acid batteries with high sulfur content, the next we're shredding cables with PVC insulation that releases different compounds," says operations director Marcus Chen. "We had a patchwork of old desulfurization units—some for lead, some for cables—and none of them talked to each other. It was chaos."

The biggest issue? Inconsistency. "Our lead battery line might be running with low sulfur emissions, but the cable line would spike, triggering alarms," Chen recalls. "We'd have to shut down one line to adjust another, leading to constant interruptions. Maintenance was a nightmare too—each unit had different parts, different manuals, different technicians."

In early 2025, Lone Star decided to centralize their desulfurization process with the help of auxiliary equipment designed for flexibility. The goal: create a single, modular system that could adapt to any feedstock. "We worked with our supplier to design a hub-and-spoke setup," Chen explains. "Waste streams from different recycling lines feed into a common duct, where a bank of de-sulfurization machines treats the air before it's released. Each machine can be dialed up or down depending on what's coming through."

The auxiliary equipment included adjustable spray nozzles, variable-speed fans, and a centralized control panel that allowed operators to monitor and tweak desulfurization parameters in real time. "It's like having a smart thermostat for air quality," Chen says. "If the lead acid battery line starts up, the system ramps up the desulfurization chemicals. If we switch to lithium batteries, it adjusts automatically. No more guesswork."

The transition wasn't without challenges. "We had to reroute some ductwork and train our team on the new controls," Chen admits. "But the supplier was with us every step of the way, providing on-site training and 24/7 support during the first month." By the end of the first quarter, the benefits were clear: standardized emissions across all lines, a 30% reduction in chemical usage for desulfurization, and a 50% ｄｒｏｐ in maintenance calls.

"The best part? We're finally in control," Chen says. "Last month, the Texas Commission on Environmental Quality did a surprise inspection, and we passed with flying colors. They even asked to tour our desulfurization setup to see how we handled such a varied operation. That's a far cry from the days of scrambling to fix non-compliant emissions readings."

Lone Star's success has inspired them to explore further upgrades, including integrating their desulfurization data with their overall recycling management software. "If we can predict sulfur spikes based on incoming materials, we can adjust our schedules to minimize emissions even more," Chen says. "The possibilities are endless when you have the right equipment."