500g/h Oxygen-Fed Ozone Generator – In-Dryer Direct Bleaching for Denim Washing
Industry Challenge
A Guangdong denim washing factory producing premium export vintage/acid-wash jeans faced critical issues with traditional potassium permanganate (PP) bleaching: high chemical costs, heavy metal-laden wastewater (Mn/Cr), 45-min slow cycles, severe fabric tensile loss, unstable color (ΔE>2.0), and post-yellowing from chemical residues—threatening both profit and global eco-compliance.
Our Solution
Deployed a 500g/h oxygen-fed ozone generator (O₃≥130 mg/L, PSA O₂≥92% purity, 0–100% linear output) directly integrated with existing sealed industrial drying tumblers (50–100 kg/batch) . The process is elegantly simple: Load semi-dry jeans (30–40% moisture) → Seal dryer → Inject high-concentration ozone → Tumble for oxidative fading → Destroy residual ozone → Unload—no extra reactor, no plant retrofit.
Breakthrough Performance
| Metric | Traditional PP | Ozone (500g/h) | Improvement |
|---|---|---|---|
| Batch cycle time | 45 min | ≤18 min | 60% faster |
| Batch-to-batch color deviation | ΔE > 2.0 | ΔE < 0.8 | 3× more consistent |
| Fabric tensile loss | Baseline | -28% | Stronger fabric |
| Chemical usage | Full PP/H₂SO₄/neutralizers | Zero | 100% eliminated |
Immediate Benefits
No post-rinse needed – Saves 1–2 tons water + multiple rinse cycles per batch.
Zero yellowing/re-dyeing – Ozone decomposes to O₂, leaving zero harmful residue.
Whisker/monkey wash effects naturally sharp, 3D vintage finish with uniform indigo removal.
Green & Cost Impact
Cuts wastewater COD & heavy metal pollutants by >75% .
Eliminates hazardous manganese sludge – zero hazardous waste disposal cost.
Daily throughput: 2.4–3.2 tons (single 100kg dryer, 8-hr shift).
Simple plug-and-play installation – minimal downtime, rapid ROI.
Conclusion
The 500g/h oxygen-fed ozone system is the lowest-cost, highest-ROI green upgrade for medium denim wash plants. It replaces toxic chemicals, slashes water/energy, protects fabric quality, and meets the world's strictest brand sustainability standards—all inside your existing dryers.
Caution: For elastane/stretch denim, reduce exposure time or ozone concentration to avoid fiber damage. Ensure proper ozone destruction unit for worker safety.
