Top 10 Sewage Treatment Machine Suppliers in South Korea

Walk into EcoWater Systems Korea’s headquarters in Daejeon, and you’ll notice something different: there’s a small wastewater treatment plant right in their lobby. “We believe in showing, not just telling,”笑着说 (smiles) Lee Soo-jin, the company’s CEO. Founded in 1995, EcoWater started as a spin-off from KAIST (Korea Advanced Institute of Science and Technology), and that academic roots still drives their work today—they hold over 120 patents, more than any other sewage treatment supplier in the country.

Their claim to fame? Revolutionizing water process equipment with membrane bioreactors (MBRs). Traditional sewage treatment plants use gravity to separate solids from water, which takes up tons of space. EcoWater’s MBRs use ultra-thin polymer membranes to filter out contaminants, cutting the footprint by 60%. “Our ECO-MBR 5000 system can treat 5,000 cubic meters of sewage per day in an area the size of a basketball court,” Lee explains. “That’s why Seoul’s Gangnam District chose us for their new plant—they had zero extra land, but needed to serve 100,000 residents.”

Today, EcoWater isn’t just a local player—they’ve installed systems in over 30 countries, from Saudi Arabia’s desalination plants to Singapore’s water reclamation projects. “Clean water doesn’t have borders,” Lee says. “We’re proud to carry South Korea’s reputation for quality to the world.”

If EcoWater is the “urban specialist,” Hanmi Environmental Tech is the “industrial workhorse.” Tucked away in Ulsan, South Korea’s industrial capital, Hanmi has been keeping the city’s factories—from Hyundai’s shipyards to SK Energy’s refineries—compliant with environmental laws since 2001. “Industrial wastewater is messy,” says Park Min-ho, Hanmi’s head of engineering. “Oils, heavy metals, chemicals… you name it, we’ve treated it.”

Hanmi’s bread and butter? Their effluent treatment machine equipment line, designed to handle the toughest industrial waste. Take their “MegaTreat 1000” system: it uses a three-step process—coagulation, flocculation, and dissolved air flotation—to remove 99.9% of oils and greases from automotive factory wastewater. “We tested it at Kia’s plant in Gwangju,” Park recalls. “They were dumping 500 tons of oily water daily; now, they reuse 80% of it for cooling towers. That’s a win for the planet and their bottom line.”

But Hanmi doesn’t stop at treatment—they’re also masters of sludge management, thanks to their filter press equipment . Their “SludgePress Pro” uses hydraulic pressure to squeeze water out of sludge, turning it from a liquid waste into dry cakes that can be incinerated or used as landfill cover. “A steel mill in Pohang was spending $20,000/month hauling wet sludge,” Park says. “With our press, they cut that cost by 70%—the dry cakes are so light, they can transport twice as much in each truck.”

What’s next for Hanmi? They’re branching into food processing wastewater, a growing market as South Korea’s kimchi and instant noodle exports boom. “Spicy, salty, starchy water is tricky,” Park laughs. “But if we can handle shipyard oil, we can handle kimchi brine.”

Not all top suppliers come from Seoul or Busan—WaterPlus Engineering got its start in 2008 in Jeonju, a quiet city famous for bibimbap. “We began by helping local farms treat agricultural runoff,” says Choi Ji-yeon, WaterPlus’s founder. “Back then, farmers were struggling with strict new laws on fertilizer and pesticide runoff. We built small, affordable systems that fit their budgets—and it took off.”

Today, WaterPlus has expanded beyond farms to serve small and medium-sized cities across South Korea, focusing on water process equipment that’s simple to install and maintain. Their “MiniClean Series” is a hit with towns like Gyeongju (population 260,000): compact treatment plants that can be up and running in just 3 months, compared to 12 months for traditional systems. “Small cities don’t have big engineering teams,” Choi explains. “Our systems are plug-and-play—we train local workers for a week, and they can handle everything from maintenance to troubleshooting.”

One of their most innovative products? The “RainyDay 3000,” a mobile sewage treatment unit mounted on a truck. “When heavy rains hit, sewers overflow, and untreated water spills into rivers,” Choi says. “Our RainyDay units can be deployed in 2 hours to treat that overflow on-site, preventing pollution. Last summer, when Busan had record floods, we sent 10 units—they treated 3,000 tons of water in 3 days.”

WaterPlus’s secret? They keep things local. “We source 90% of our parts from Korean suppliers,” Choi says. “That means faster repairs, lower costs, and we’re supporting our own economy. Plus, our engineers live in the towns we serve—they’re not just selling equipment; they’re part of the community.”

When you think of Korean exports, you might picture cars or smartphones—but K-Clean Solutions wants you to think sewage treatment, too. Based in Incheon (home to South Korea’s largest port), K-Clean has built its business on selling to overseas markets, with 70% of its revenue coming from exports to Southeast Asia, the Middle East, and Africa.

“Many developing countries don’t have the infrastructure for big treatment plants,” explains Kim Dong-hyun, K-Clean’s export director. “They need systems that are tough, easy to fix, and don’t require fancy parts. That’s where we excel.” Their “GlobalTreat 2000” is a modular system—think of it as Lego for sewage treatment—where you can add extra units as a city grows. “A town in Vietnam started with 2 units (treating 2,000 cubic meters/day) in 2015; now they have8 units serving 50,000 people,” Kim says. “We never sell them more than they need today, but we make sure they can expand tomorrow.”

K-Clean also specializes in filter press equipment for mining operations, where wastewater is loaded with heavy metals like lead and copper. Their “MinePress 500” uses chemical additives to bind metals into solids, which can then be recycled. “A gold mine in Ghana was losing $50,000/month in wasted gold particles,” Kim recalls. “Our press captured those particles—now they’re profiting from their ‘wastewater.’”

What’s their export strategy? They partner with local distributors, not just sell to them. “We train their technicians, set up spare parts warehouses, and even help with government certifications,” Kim says. “In Indonesia, we’ve been working with the same distributor for 12 years—they know our equipment better than we do! That trust is why we’re the top Korean sewage treatment exporter 5 years in a row.”

GreenWave Environmental has a bold mission: to make sewage treatment plants energy self-sufficient. “Wastewater is full of organic matter—why not use that to power the treatment process?” asks Jung Hae-ri, GreenWave’s chief technology officer. Founded in 2010 in Seoul, the company has pioneered the use of anaerobic digestion in sewage treatment, where bacteria break down waste to produce biogas (methane), which can then be burned for electricity.

Their “BioEnergy Plant” system is a game-changer. A typical 10,000 cubic meter/day treatment plant uses about 1,500 kWh of electricity daily. GreenWave’s system produces 2,000 kWh/day—enough to run the plant and sell the excess back to the grid. “The Seoul Metropolitan Government was skeptical at first,” Jung admits. “But after installing our system at their Mapo District plant in 2018, they saved $120,000/year on electricity bills. Now they’re rolling it out citywide.”

GreenWave also excels in effluent treatment machine equipment for food and beverage companies, where wastewater is rich in sugars and starches—perfect for biogas production. “Lotte Confectionery’s factory in Gimcheon was paying to haul away wastewater,” Jung says. “Now, our system treats it, generates electricity for their production lines, and the leftover sludge is sold as organic fertilizer to local farms. It’s a closed loop!”

What’s next? GreenWave is testing a new system that captures carbon dioxide from biogas to grow algae, which can then be used as animal feed. “Sewage treatment shouldn’t just be about cleaning water—it should be about creating value,” Jung says. “We’re not just engineers; we’re circular economy architects.”

Seoul isn’t just a big city—it’s a “smart city,” with sensors and data analytics optimizing everything from traffic to waste collection. And AquaTech Korea is the brains behind its smart sewage systems. Founded in 2003, the company has become a leader in integrating AI and IoT into sewage treatment, making plants more efficient and less labor-intensive.

Their “SmartSewage Platform” is like a brain for treatment plants. It collects data from hundreds of sensors—pH levels, oxygen levels, flow rates—and uses machine learning to predict problems before they happen. “Traditional plants react to issues; we prevent them,” says Kim Yoo-jin, AquaTech’s IoT director. “Last winter, our system detected a ｄｒｏｐ in bacteria activity in a Goyang plant and automatically adjusted the heater—saving the operators from a 2-day shutdown.”

AquaTech’s water process equipment is also designed for urban density. Their “VerticalFlow” system stacks treatment stages vertically, reducing land use by 75%. “In Seoul’s Jongno District, where land costs are sky-high, we built a plant that treats 3,000 cubic meters/day in a 3-story building,” Kim says. “The roof even has a community garden—residents love it!”

They’re also big on public engagement. Their “WaterWise” app lets residents track real-time water quality in their neighborhood and learn how their daily habits (like using less detergent) impact treatment. “Sewage treatment used to be invisible,” Kim says. “Now, people feel connected to it—they see that their actions matter.”

Not every city or factory has deep pockets, and CleanFlow Industries is on a mission to make sewage treatment affordable for everyone. Founded in 2012 in Daegu, the company specializes in low-cost, high-quality systems for small municipalities and SMEs (small and medium enterprises) that can’t afford million-dollar equipment.

Their secret? Simplifying without cutting corners. “We focus on the essentials,” says Park Seo-yeon, CleanFlow’s founder and a former public health engineer. “Traditional systems have lots of bells and whistles—we strip it down to what’s needed to meet regulations, then use off-the-shelf parts to keep costs low.” Their “BasicTreat 1000” system, for example, treats 1,000 cubic meters/day for half the price of competitors, thanks to gravity-based sedimentation and simple paddle mixers.

CleanFlow is also a leader in effluent treatment machine equipment for small factories, like textile dyers or food processors. “A tofu factory in Jeju was about to shut down because they couldn’t afford a treatment system,” Park recalls. “We built them a custom system using recycled plastic tanks and locally sourced filters for $20,000—now they’re compliant and thriving.”

What’s their business model? They offer “pay-as-you-go” financing, where clients pay monthly based on the volume of water treated. “Many small businesses can’t take out big loans,” Park says. “Our model lets them start treating water immediately, with payments that grow as their business grows. It’s win-win.”

With a research lab bigger than their manufacturing facility, Korea Water Tech (KWT) is all about pushing the boundaries of sewage treatment technology. Founded in 1989 (making them one of the oldest on this list), KWT has been behind some of the biggest innovations in the industry, from the first Korean-made MBR to nanotechnology-based filters.

Their latest breakthrough? “NanoFilter X,” a filter membrane coated with graphene oxide that can remove 99.99% of microplastics from wastewater—a growing concern as microplastics are found in everything from drinking water to seafood. “Traditional membranes get clogged easily,” explains Dr. Lee Jong-ho, KWT’s chief researcher. “Graphene oxide is super smooth, so it resists clogs and lasts 3 times longer. We’re testing it at Incheon International Airport, where microplastics from runoff are a problem.”

KWT also leads in filter press equipment innovation, with their “QuickPress” system that de-waters sludge in 30 minutes instead of 4 hours. “Sludge handling is the most labor-intensive part of treatment,” Dr. Lee says. “Our QuickPress uses high-pressure air and vibration to squeeze out water faster—operators can handle 8 times more sludge with the same staff.”

What drives their research? Partnerships with universities and government agencies. “We work with Seoul National University’s environmental engineering department on new materials, and we get grants from the Ministry of Environment to test cutting-edge ideas,” Dr. Lee says. “We’re not just a company—we’re part of Korea’s environmental R&D ecosystem.”

South Korea has 2,413 km of coastline, and BlueOcean Systems is the go-to supplier for keeping its ports and marinas clean. Founded in 2005 in Busan, the company designs sewage treatment systems for ships, offshore oil rigs, and coastal communities where wastewater flows directly into the ocean.

Shipboard systems are a unique challenge—they have to be compact, shock-resistant, and use minimal energy (ships run on expensive diesel). BlueOcean’s “MarineTreat 500” fits under a ship’s deck, treats 500 liters of sewage per day, and meets the strictest international standards (like IMO MEPC.227(64)). “Cruise lines love us because our systems don’t smell—no more complaints from passengers!” jokes Kim Min-seok, BlueOcean’s marine division head.

On land, their effluent treatment machine equipment is protecting some of Korea’s most beautiful coastlines. In Jeju Island, a popular tourist spot, BlueOcean installed systems in 20 coastal hotels, preventing 3,000 tons of untreated wastewater from reaching the ocean yearly. “Jeju’s coral reefs were dying from nutrient pollution,” Kim says. “Now, the water is so clear, snorkelers can see fish 10 meters down.”

BlueOcean is also pioneering floating treatment plants—barge-mounted systems that can be moved to where they’re needed most. “After the 2020 floods in Gwangyang Bay, we deployed 3 floating plants to treat runoff until permanent facilities were rebuilt,” Kim explains. “They’re like emergency response teams for water pollution.”

The youngest company on our list, PureFlow Engineering was founded in 2018 by a group of 20-something engineers who wanted to disrupt the industry with fresh ideas. “We saw that most sewage treatment suppliers were stuck in the past—using the same designs for 20 years,” says Kim Tae-hyun, PureFlow’s CEO and a former Tesla engineer. “We wanted to bring the ‘startup mindset’ to water treatment: iterate fast, listen to customers, and build what they actually need.”

Their first product, “FlowPod,” is a portable sewage treatment unit the size of a shipping container. It can be delivered by truck, set up in a day, and treat 1,000 cubic meters/day—perfect for construction sites, disaster zones, or temporary events. “When the PyeongChang Olympics needed extra treatment capacity for 100,000 visitors, they rented 5 FlowPods,” Kim says. “After the games, we moved them to a rural village that had been waiting for a permanent plant.”

PureFlow is also reimagining water process equipment with user experience in mind. Their systems have touchscreen controls (no more confusing dials!), modular parts that snap together (so repairs take 30 minutes instead of 3 days), and even a “panic button” that connects directly to their support team. “We spent a month shadowing plant operators to see their frustrations,” Kim says. “One guy told us he spent 2 hours every day just checking gauges—now our app sends him the data automatically.”

Funded by venture capital and government grants, PureFlow is growing fast—they tripled revenue in 2023 and plan to expand to the U.S. next year. “We’re not here to compete with the big guys on size,” Kim says. “We’re here to out-innovate them on simplicity and customer love.”