With the rapid expansion of the global new energy industry, photovoltaic manufacturers are facing higher requirements for green production and eco-compliant emissions. The production of solar cells and modules covers multiple processes including silicon wafer cleaning, wet etching, coating, dispensing and encapsulation, generating VOCs, acidic waste gas and fluorine-containing pollutants.
Waste gas from photovoltaic plants features diverse pollutants, continuous emission, obvious concentration fluctuations and strong corrosiveness. Conventional single treatment technologies cannot support long-term stable operation. Therefore, professional PV waste gas treatment equipment shall adopt the technical route of classified collection and differentiated treatment based on pollution characteristics of different working procedures.
I. Sources and Characteristics of Waste Gas from Solar Panel Production
1. Waste Gas from Silicon Wafer Processing & Chemical Treatment
In PV silicon wafer manufacturing, chemicals such as hydrofluoric acid (HF) and hydrochloric acid are used for cleaning, texturing and etching, producing corrosive acidic waste gas. Main pollutants:
- Hydrogen Fluoride (HF)
- Acid mist
- Chloride gas
This type of waste gas is highly corrosive. Long-term discharge not only harms the environment, but also accelerates wear and tear of production pipelines and environmental protection facilities. Acid & alkaline scrubbers are commonly deployed for this waste gas. Sufficient contact between absorbent liquid and polluted gas enables efficient removal of acidic contaminants.
2. VOCs Waste Gas from Solar Cell Manufacturing
Processes including cleaning, photolithography, coating and dispensing in cell production consume organic solvents such as acetone, isopropyl alcohol (IPA) and ethanol, generating massive VOCs. Main pollutants:
- Ketones
- Alcohols
- Aromatic hydrocarbons
- Volatile organic solvents
Characterized by large air volume, low concentration and continuous discharge, such waste gas is the core priority for PV waste gas abatement. Zeolite Rotor Concentration + Regenerative Thermal Oxidation (RTO) is the mainstream industrial solution: The zeolite rotor adsorbs and concentrates low-concentration VOCs, followed by high-temperature oxidation in RTO to decompose organic pollutants, delivering high purification efficiency while cutting energy consumption.
3. Waste Gas from PV Module Encapsulation
During solar module encapsulation, film lamination and curing, auxiliary materials such as EVA and adhesives release trace organic waste gas. Main pollutants:
- Non-methane Hydrocarbons (NMHC)
- VOCs
- Organic additives
Treatment technologies including adsorption purification and thermal oxidation can be selected according to waste gas concentration and emission patterns.
II. Waste Gas Treatment Equipment & Technical Solutions for PV Industry
Combined treatment systems are adopted for varied waste gas generated in photovoltaic manufacturing:
- Acid & alkaline scrubbers for inorganic waste gas (HF, acid mist) from silicon wafer cleaning and etching;
- Zeolite Rotor + RTO systems for high-air-volume low-concentration VOCs from cell fabrication to realize adsorption concentration and high-efficiency oxidative purification;
- Thermal Oxidizer (TO) or RTO units for medium-to-high concentration organic waste gas subject to actual working conditions;
- Classified and differentiated treatment for integrated factories with both acidic waste gas and organic waste gas, preventing acidic substances from impairing stable operation of downstream oxidation equipment.
III. CADAIR Benchmark Waste Gas Treatment Cases for PV Industry
CADAIR has long served high-end manufacturing sectors including semiconductors, wafer fabrication and Micro LED. Our waste gas treatment technologies are highly compatible with photovoltaic processes covering silicon wafer processing, cleaning, coating and encapsulation. The following projects serve as references for PV manufacturing waste gas abatement.
Case 1 | Waste Gas Treatment Project, General Semiconductor (Tianjin) Wafer Fabrication
Project Parameters: Air handling capacity: 30,000 m³/h Primary pollutants: VOCs including acetone and propyl bromide, highly similar to organic waste gas from PV cell cleaning, coating and photolithography processes. Treatment Solution: Precision Filtration + Zeolite Rotor Concentration + 3-bed RTO The zeolite rotor concentrates low-concentration VOCs to improve combustion efficiency in downstream units. Project Performance: Zeolite rotor adsorption efficiency ≥98%; RTO purification efficiency ≥99%. Emission standards achieved:
- NMHC ≤20 mg/m³
- TRVOC ≤40 mg/m³ The system operates steadily on a long-term basis and meets strict environmental requirements of high-end manufacturing.
Case 2 | Waste Gas Treatment Project, BOE (Zhuhai) Micro LED Wafer Fabrication & Packaging Base
Micro LED manufacturing shares strong similarities with PV production in wafer processing, chemical treatment and organic material application. Adopted Solution: Acid & Alkaline Scrubber + Fixed Zeolite Bed + RTO Separate treatment for inorganic acidic waste gas and organic VOCs. Advantages:
- Avoid ingress of acidic gas into the RTO system
- Prevent regenerator corrosion
- Extend equipment service life
- Enhance long-term operational stability Suitable for large-scale PV industrial parks and integrated manufacturing bases.
Case 3 | Waste Gas Treatment Project (BeiJing) for Semiconductor Wafer Cleaning
Project Parameters: Air handling capacity: 20,000 m³/h Primary pollutants: VOCs such as acetone and alcohols Treatment Solution: Activated Carbon Adsorption System Featuring compact structure, stable operation and low maintenance cost, this solution fits small & medium-sized PV module factories, pilot production lines and R&D workshops.
IV. CADAIR New Energy Waste Gas Treatment Solutions
Specializing in industrial VOCs abatement and waste gas treatment for high-end manufacturing, CADAIR provides photovoltaic, semiconductor and new energy enterprises with:
- PV VOCs waste gas treatment equipment
- Zeolite rotor concentration systems
- RTO regenerative thermal oxidation equipment
- TO thermal oxidation equipment
- Acid & alkaline waste gas scrubbing systems
- Integrated waste gas treatment EPC solutions
Drawing on extensive experience in advanced manufacturing projects, CADAIR delivers one-stop services ranging from waste gas collection, solution design and equipment supply to operational support customized to diverse photovoltaic production workflows.
