20+ years waste gas treatment expertise icon

20+ Years of Technical Expertise

A comprehensive one-stop enterprise specializing in environmental protection systems, including exhaust gas treatment, air purification, and dust-free, sterile cleanrooms.

integrated environmental solutions icon

Defa Environmental empowers you to drive high-efficiency revenue growth and creates value through partnership.

A comprehensive provider integrating air purification, exhaust gas treatment, and cleanroom solutions.

24/7 customer support hotline icon

24/7 Global After-sales Service Network

+86-13957433670

+86-574-87620119

FAQ

Quick answers to the most common inquiries from our global clients.

How Do I Know Which Waste Gas Treatment System Is Right For My Factory?

We offer a Free Customized Assessment. Just send us your exhaust gas components (VOCs concentration, flow rate, temperature) and your local emission standards. Our engineers will recommend the most cost-effective solution (RTO, Scrubber, or Biological Tower) within 12 hours.

How Do You Guarantee The Emission Standards Compliance?

Every system undergoes a 3-stage quality check before delivery. We provide a Performance Guarantee Certificate ensuring removal rates up to 99%+. We also offer on-site commissioning and third-party testing assistance to meet EPA, EU, or local GB standards.

Are Your RTO Systems Energy-Efficient? What Is The Operational Cost?

Yes. Our RTO features a ≥95% heat recovery efficiency, which significantly reduces your natural gas consumption. We provide a detailed Mass Balance & Energy Cost Analysis upfront, so you can see the ROI before purchasing.

Do You Provide After-Sales Technical Support For Overseas Clients?

Absolutely. We offer 24/7 remote technical support, video guidance for installation, and free spare parts for critical components within the warranty period. We can also dispatch our engineers overseas for project supervision upon request.

about us

Company Profile

DeFa Environmental Equipment (Ningbo) Co., Ltd.

With over 20 years of continuous innovation, DeFaee Environmental specializes in waste gas treatment, air purification, industrial dust removal and intelligent control systems. We provide end-to-end solutions from R&D and manufacturing to system integration and after-sales support.

Our Core Technical Strengths:

  • RTO (Regenerative Thermal Oxidizer): 99%+ VOCs removal rate, 95%+ heat recovery efficiency
  • Wet Scrubber & Wet ESP: High-efficiency acid mist and particulate removal for chemical and metallurgical industries
  • Plasma & High-Voltage Power Supply: Self-developed intelligent digital HV power supplies for stable, reliable electrostatic precipitation
  • Biological Deodorization: Corrosion-resistant PP systems for kitchen waste, livestock farms, and biopharmaceutical applications
  • CO Oxidation Furnace: Two-stage heat exchange design with 99%+ conversion rate and low operating cost

Industries We Serve:

Machinery & Auto Parts | Chemical & Petrochemical | Photovoltaic & Solar Manufacturing | Food Processing | Metallurgy & Building Materials | Pharmaceutical & Biotech | Municipal Solid Waste Treatment

Learn More About Our Factory & Capabilities

20

Years of Technology

Customers

Domestic And Oversea

Research

Waste Gas Treatment

Applied In

Various Industries

Defaee is a leading China manufacturer of waste gas treatment, industrial dust removal, and air purification systems. Offering OEM & customized solutions with factory price. Get a quick quote today.

Featured Products

Focusing on researching air purification and waste gas treatment processes and technologies

Get In Touch

For inquiries about our products or pricelist, please leave your email to us and we will be in touch within 24 hours.

Address

No. 661 Cangchu Road, Jiangbei District, Ningbo City,ZHEJIANG PROVINCE,CHINA

News & Blogs

Expert insights, technical guides, and project case studies on waste gas treatment, VOCs removal, and air pollution control solutions

What is a three acid waste gas treatment system?

What is a three acid waste gas treatment system?

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2026-04-29

The three acid waste gas treatment system mainly adopts the combination process of "spray tower+wet electrostatic precipitator" to efficiently remove acidic gases and acid mist such as hydrochloric acid, sulfuric acid, nitric acid, etc., achieving ultra-low emissions.

What is the treatment of organic waste gas from a thermal turbine?

What is the treatment of organic waste gas from a thermal turbine?

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2026-04-29

The main components of organic waste gas from the hot forging machine are oil mist, volatile organic compounds (VOCs), particulate matter, and odorous gases. Its treatment requires the use of a "multi-stage purification+combined process" to achieve efficient emission control.

What is photovoltaic organic waste gas treatment?

What is photovoltaic organic waste gas treatment?

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2026-04-29

The treatment of photovoltaic organic waste gas mainly adopts the combination process of "adsorption concentration+catalytic combustion" or "zeolite wheel+RTO" to efficiently remove VOCs pollutants such as non methane total hydrocarbons and organic solvent volatiles produced by EVA pyrolysis.

What Complete Process Effectively Treats Complex Quenching Waste Gas Containing Oil Mist, VOCs and Particulates?

What Complete Process Effectively Treats Complex Quenching Waste Gas Containing Oil Mist, VOCs and Particulates?

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2026-04-29

The main components of quenching process exhaust gas are oil mist, volatile organic compounds (VOCs), particulate matter, nitrogen oxides, and hydrocarbons. The treatment plan usually adopts a combination of "pretreatment+core purification+deep treatment" process.

RTO vs Activated Carbon: Which VOC Treatment System Fits Your Process?

RTO vs Activated Carbon: Which VOC Treatment System Fits Your Process?

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2026-08-10

Choose an RTO when the process has a meaningful, reasonably steady VOC mass load, the compounds are suitable for thermal oxidation, and the plant needs continuous destruction rather than routine media replacement. Choose activated carbon when the VOC load is lower or intermittent, the gas is cool and compatible with the selected carbon, and the facility can monitor breakthrough and manage spent or regenerated media. A high-airflow, dilute stream may need source segregation or concentration before either option becomes economical. There is no reliable universal concentration threshold separating the two. Airflow, VOC composition, annual operating hours, humidity, temperature, peak loading and the required outlet limit can change the answer. For a broader view of available technologies, start with the complete industrial VOC treatment guide.

Industrial VOC Treatment: A Practical Guide to Methods, System Selection and Cost

Industrial VOC Treatment: A Practical Guide to Methods, System Selection and Cost

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2026-08-10

There is no universal “best” industrial VOC treatment method. The right system depends on the actual exhaust stream: airflow, VOC concentration and mass loading, chemical composition, temperature, humidity, particulate or acid-mist content, operating schedule, safety constraints and the emission limit in the facility’s permit. Thermal and catalytic oxidizers destroy VOCs; activated carbon and zeolite systems capture them; condensers recover suitable compounds; wet scrubbers absorb soluble gases; and plasma or biological systems may suit selected low-concentration or odor-driven applications. Complex exhaust normally needs a treatment train rather than one device.

How Does Waste Gas Treatment Equipment Improve Industrial Air Quality and Environmental Compliance?

How Does Waste Gas Treatment Equipment Improve Industrial Air Quality and Environmental Compliance?

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2026-08-07

Industrial production processes often generate waste gases containing harmful pollutants, odors, volatile organic compounds (VOCs), dust particles, and other contaminants. Without proper treatment, these emissions can negatively affect employee health, surrounding communities, and environmental sustainability. Waste Gas Treatment Equipment provides an effective solution by capturing, filtering, and transforming harmful gases into safer substances before they are released into the atmosphere.

How Does Air Pollution Control Equipment Improve Industrial Air Quality?

How Does Air Pollution Control Equipment Improve Industrial Air Quality?

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2026-07-30

Industrial activities such as manufacturing, chemical processing, power generation, and material handling often release dust, fumes, gases, and other airborne pollutants. Without effective treatment solutions, these emissions can affect worker safety, production efficiency, equipment lifespan, and environmental compliance. Air Pollution Control Equipment provides a reliable approach to capturing, filtering, and treating harmful pollutants before they enter the atmosphere.

How Can Shengyuan’s High-Voltage Plasma System Address Your Industry’s Pain Points?

How Can Shengyuan’s High-Voltage Plasma System Address Your Industry’s Pain Points?

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2026-07-29

Ningbo Jiangbei Shengyuan Electronic Technology has officially unveiled its proprietary multifunctional integrated high-voltage plasma system. Built on self-developed intelligent high-voltage power supplies, it serves four core industrial sectors and supports both complete equipment and customized supply solutions.

Industrial VOC Treatment: A Complete Guide to Methods, Cost, and Compliance

Industrial VOC Treatment: A Complete Guide to Methods, Cost, and Compliance

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2026-07-27

Industrial VOC treatment strips volatile organic compounds out of factory exhaust before it reaches the air. Six methods do most of the work: thermal oxidation (RTO), catalytic oxidation, adsorption, wet scrubbing, low-temperature plasma, and biological deodorization. Which one fits comes down to your VOC concentration, airflow, and temperature. Our RTO hits a 99%+ VOCs removal rate at 95%+ heat recovery.

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