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Ⅰ. Source and Treatment Process of Screen Printing Waste Gas Treatment Equipment
Raw materials used in screen printing production contain organic solvents such as benzene, toluene and xylene. These substances are liquid at room temperature with high volatility, continuously releasing pungent organic waste gas. The waste gas not only pollutes the atmospheric environment, but also endangers the physical and mental health of workshop operators and surrounding residents. To help screen printing enterprises solve environmental protection problems and realize compliant production, Zhonghuan Lvzhou Environmental Protection has specially developed waste gas treatment equipment adopting the combined process of microbial deodorization + activated carbon adsorption. The equipment is suitable for textile screen printing, garment printing, pad printing and other scenarios to achieve efficient waste gas purification.
Ⅱ. Screen Printing Waste Gas Treatment Process Flow
Waste gas source → Gas collection hood (special collecting hood for pad printing machine workbench) → Pressured induced draft fan → Microbial trickling filter equipment → Activated carbon adsorption equipment → Centrifugal fan → High-altitude compliant discharge
Ⅲ. In-depth Analysis of Screen Printing Waste Gas Treatment Process
1. Microbial Trickling Filter Equipment
As the core treatment unit, the microbial trickling filter purifies waste gas relying on microbial metabolism. Efficient microorganisms cultured inside the equipment take organic pollutants such as benzene, toluene and xylene in waste gas as nutrients. Through biochemical reactions, harmful substances are completely decomposed into carbon dioxide, water and microbial cell substances without secondary pollution. Meanwhile, the equipment effectively degrades pungent components and eliminates odor fundamentally, greatly improving the air quality of workshops and surrounding areas.
2. Activated Carbon Adsorption Equipment
The waste gas treated by microorganisms enters the activated carbon adsorption equipment for deep purification. Granular activated carbon with high adsorption performance is adopted, with a specific surface area ranging from 500 to 1500m²/g. Its developed porous structure firmly adsorbs residual organic pollutants. The combined mode of biodegradation + physical adsorption breaks the purification bottleneck of a single process, matches the characteristics of screen printing waste gas, and ensures the discharged gas is clean and odorless.
Ⅳ. Compliance Standard of Screen Printing Waste Gas Treatment Equipment
The purified waste gas is discharged through a 15-meter-high exhaust chimney. The pollutant concentration and discharge rate strictly comply with the second-period emission limits specified in Emission Standard of Volatile Organic Compounds for Printing Industry (DB44/815-2010) of Guangdong Province.
| No. | Pollutant Name | Maximum Allowable Emission Concentration (mg/m³) | Exhaust Stack Height (m) | Maximum Allowable Emission Rate (kg/h) - Grade II |
|---|---|---|---|---|
| 1 | Benzene | 1 | 15 | 0.4 |
| 2 | Toluene | 15 | 15 | 1.0 |
| 3 | Xylene | 15 | 15 | 1.0 |
| 4 | Total VOCs | 80 | 15 | 2.9 |
Ⅴ. Core Advantages of Screen Printing Waste Gas Treatment Equipment
1. High purification efficiency: The combined effect of microbial degradation and activated carbon adsorption achieves an overall organic pollutant removal rate of over 90%. Odor is completely eliminated with discharge indicators superior to standard requirements.
2. Environmental protection and energy saving: The microbial treatment process consumes low energy. Activated carbon materials are easy to replace. The overall operating cost is economical, meeting the long-term usage needs of small and medium-sized enterprises.
3. Wide application range: Customized collection and treatment schemes are available for different processes such as textile screen printing, garment printing and pad printing. Special workbench collecting hoods are equipped to avoid gas leakage.
4. Reliable compliance: The process design conforms to national environmental protection policies without secondary pollution, helping enterprises pass environmental acceptance and daily supervision smoothly.
Ⅵ. Screen Printing Waste Gas Treatment Engineering Cases
Zhonghuan Lvzhou Environmental Protection has provided mature waste gas treatment solutions for numerous screen printing enterprises. All equipment operates stably with compliant discharge. Typical projects are as follows:
Zhonghuan Lvzhou Environmental Protection is a comprehensive environmental protection enterprise specializing in the treatment of screen printing waste gas, printing waste gas and ink waste gas. Customized treatment solutions are available according to actual production conditions. We provide one-stop services including design, construction and installation for all customers.
