Top 10 Fine Bubble Disc Diffuser Manufacturers in China [2025 Guide]

In wastewater treatment, fine bubble disc diffusers become one of the most widely used solutions. And China has developed into a global hub for these diffuser manufacturing in recent years. From large engineering companies with full project capabilities to specialized factories focusing on diffuser membranes, Chinese suppliers provide a wide range of options for international buyers. However, with so many manufacturers in the market, choosing the right partner can be challenging.
To help you make a wiser decision, we have compiled a list of the best 10 fine bubble disc diffuser manufacturers in China (2025) in this guide. This ranges from each supplier's background, strengths, and key products, so you can compare and find the manufacturer that best matches your project requirements.

Fine bubble diffusers are composed of a carrier and a membrane that evenly release bubbles approximately 1-2 mm in diameter into the water. They are a common aeration solution for municipal and industrial wastewater treatment, especially in processes like SBR, MBBR, MBR, and extended aeration systems.
Compared to coarse bubble aerators, fine bubble diffusers achieve nearly twice the oxygen transfer efficiency. This means treatment plants can reach the same aeration capacity with significantly less compressed air, resulting in huge energy savings and lower operating costs.

China's wastewater treatment equipment industry has developed the following advantages:
• Strong Industrial Clusters: Cities like Yixing (Jiangsu), Xinxiang (Henan), Shanghai, and Hunan host complete supply chains dedicated to environmental equipment manufacturing.
• Competitive Pricing with Quality Assurance: Many Chinese factories combine in-house R&D, automated production lines, and ISO-certified quality systems. So you can get high-quality aeration diffusers at a cost-effective price.
• Proven Global Export Experience: Most Chinese suppliers already serve markets across Asia, the Middle East, Africa, Europe, and North America. They're familiar with target market regulations and required documentation, and can simplify your logistics and communication.
For buyers, this means you can find suppliers who not only offer competitive prices, but also provide customization, engineering support, and after-sales service.

UD Environmental Equipment Technology Co., Ltd.

1. UD Environmental Equipment Technology Co., Ltd.
• Website: https://www.udenvironment.com/
• Location: Hunan
• Years in business: 20+ years
• Main markets: Asia, Africa, Middle East
UD Environmental is more than just a diffuser supplier, it is a large-scale engineering company capable of delivering full water and waste treatment solutions. Their fine bubble disc diffusers are typically EPDM-based, with ABS or PP+glass fiber frames. With ISO9001, ISO14001, and OHSMS18001 certifications, UD can support projects from design to installation, making them a reliable choice for municipal-scale operations.

Qiankun Environmental Protection Joint Stock Co., Ltd.

2. Qiankun Environmental Protection Joint Stock Co., Ltd.
• Website: https://www.sewagewaters.com/
• Location: Xinxiang, Henan
• Years in business: 16 years
• Main markets: Iran, India, Southeast Asia, Africa
Based in Xinxiang, Qiankun is known for its engineering background and customized OEM requests. The company holds multiple construction licenses and provides wastewater projects in industries such as pulp and paper, textiles, and chemical processing. Their disc diffusers (mainly 260mm and customizable sizes) feature 80–100 μm pores, ensuring high oxygen transfer efficiency.

Yixing Holly Technology Co., Ltd.

3. Yixing Holly Technology Co., Ltd.
• Website: https://www.hollyep.com/
• Location: Wuxi, Jiangsu
• Years in business: 18 years
• Main markets: 80+ countries worldwide
Holly is one of the earliest private enterprises in wastewater equipment manufacturing. With an extensive portfolio, ranging from screw presses to DAF systems and diffusers, the company serves both municipal and industrial clients. Over 80% of its products are exported, backed by a complete after-sales support system. Their fine bubble disc diffusers feature an EPDM surface with slits and flow patterns, along with an integrated check valve to prevent backflow. They are also available in multiple disc diameters, including the popular 6-inch, 8-inch, 9-inch, and 12-inch models.

Hangzhou AquaSust Water Technology Co., Ltd.

4. Hangzhou AquaSust Water Technology Co., Ltd.
• Website: https://www.aquasustfactory.com/
• Location: Hangzhou, Zhejiang
• Years in business: 15+ years
• Main markets: North America, Europe, Asia
AquaSust is recognized as a pioneer among China's water treatment providers, with a unique combination of plastic and rubber plant backgrounds. They were honored with the National High-tech Enterprise award in 2019, holding various product patents and quality certificates, such as the SGS, NOV, ISO, etc. The company boasts a 21,760 square meter factory, 200 high-speed extrusion and injection molding lines. In addition to high-efficiency EPDM disc diffusers, AquaSust also provides integrated custom wastewater treatment solutions tailored to municipal, industrial, and aquaculture applications to global buyers.

Henan Eco Environmental Protection Equipment Co., Ltd.

5. Henan Eco Environmental Protection Equipment Co., Ltd.
• Website: https://www.eco-watertechs.com/
• Location: Xinxiang, Henan
• Years in business: 11 years
• Main markets: US, Russia, Brazil, Southeast Asia
Henan Eco focuses on cost-effective diffuser systems and personalized service. Their diffusers are offered in ABS+EPDM materials with pore sizes of 80-100 μm. The company highlights flexibility, with engineers available for customized drawings and a 24/7 quotation service. For small to medium-scale buyers seeking responsiveness and quick lead times, Henan Eco is a practical option.

KHN Water Treatment Equipment Co., Ltd.

6. KHN Water Treatment Equipment Co., Ltd.
• Website: https://www.khnwatertreatment.com/
• Location: Kunshan, Jiangsu
• Years in business: 11 years
• Main markets: Europe, the Middle East, the Americas
KHN is positioned as a one-stop supplier of water treatment systems. In addition to fine bubble diffusers, their portfolio includes clarifiers, dewatering machines, and RO systems. With ISO9001, ISO14001, and BCC certifications, KHN is reliable in projects where buyers require not only diffusers but also entire treatment solutions.

Wuxi Qiuyuan Environmental Engineering Co., Ltd. (Bioetp)

7. Wuxi Qiuyuan Environmental Engineering Co., Ltd. (Bioetp)
• Website: https://www.bioetp.com/
• Location: Wuxi, Jiangsu
• Years in business: 19 years
• Main markets: Asia, Europe
Bioetp is an engineering-oriented company specializing in engineering design and equipment manufacturing for industrial wastewater and waste gas treatment. Partnering with leading universities such as Zhejiang University and Nanjing Tech University, the company integrates R&D into its diffuser products and broader treatment equipment. In addition to fine bubble disc diffusers, the company also manufactures spiral sludge dewatering systems and provides installation, commissioning, and operational services.

Lanyu Gusta Water Treatment Co., Ltd.

8. Lanyu Gusta Water Treatment Co., Ltd.
• Website: https://www.gustawater.com/
• Location: Hengshui, Hebei
• Years in business: 22 years
• Main markets: Global
Lanyu is one of China's leading solution providers for wastewater treatment plants, fish farms, and aquariums. The company specializes in producing K1 MBBR media, tube settlers, aeration diffusers, and pall rings. Most products can be fully customized in size, color, and detail to meet client requirements. Currently, Lanyu operates three factories with automated production systems and quality inspection engineers. Their diffusers are made of low-plasticizer EPDM, silicone membranes, ABS carriers, and GFRP structures. And they're enhanced with nanotechnology to reduce surface fouling.

Yixing Lianhua Environmental Protection Co., Ltd.

9. Yixing Lianhua Environmental Protection Co., Ltd.
• Website: https://www.lhwatertreatment.com/
• Location: Wuxi, Jiangsu
• Years in business: 25 years
• Export markets: Global
Lianhua specializes in the manufacturing and installation of environmental protection equipment, equipment commissioning, and engineering contracting, occupying a site area of 10,000 square meters. They combine R&D strength with international certifications such as CE, ISO, SGS, and TUV. Their diffusers (215/260/300 mm) use EPDM or silicone membranes with advanced drilling technology, coming with longer service life and efficient oxygen transfer. With multilingual customer service and OEM/ODM flexibility, Lianhua is often selected by international buyers who need deep technical collaboration.

Tongxiang Small Boss Special Plastic Products Co., Ltd.

10. Tongxiang Small Boss Special Plastic Products Co., Ltd.
• Website: https://www.smallboss.com/
• Location: Jiaxing, Zhejiang
• Years in business: 32 years
• Main markets: Global
Small Boss focuses on the production of various PVC profiles, PVC compounds, and MBBR filter media. Its factory covers an area of 48,600 square meters, with workshop space exceeding 52,000 square meters, and possesses high-speed production capacity with 120 extrusion production lines. With strong R&D links to universities, they also established an independent laboratory and comprehensive testing equipment. We can provide private label, ODM, OEM, and other solutions to meet your water treatment project needs.

When sourcing disc diffusers, consider the following:
• Experience & Certifications: Look for ISO, CE, and SGS to ensure international compliance for the fine bubble disc diffusers, which shows
• Membrane Material: Consider first the EPDM, Silicone, or PTFE disc diffusers, depending on the sewage environment and lifespan needs. These materials are often more resistant to wear, tear, and chemical corrosion.
• Customization: Confirm whether the supplier offers OEM/ODM services for your project's specifications.
• Service & Support: Evaluate the suppliers' after-sales service, response time, and global logistics.
• Scale & References: For large municipal projects, established manufacturers with engineering teams or rich project experience are preferable.

The companies listed above represent some of the most reliable fine bubble disc diffuser manufacturers in China. Each offers different strengths in terms of product range, certifications, and export experience. By comparing their capabilities and aligning them with your project requirements, you'll be better equipped to identify the right partner for your wastewater treatment needs.

If you are looking for high-performance disc diffusers or complete wastewater treatment solutions, contact AquaSust today. Our team can provide tailored recommendations, technical support, and competitive pricing to meet your project needs.