TW 
EN Why Are Pulp & Paper Mill Odors So Hard to Treat?
Odor Threshold — Only Decomposition Works
The odors produced in the papermaking process typically originate from hydrogen sulfide, thiols, and sulfur dioxide generated during the process. Angel Natural Enzyme Deodorizer neutralizes and degrades these odors, truly reducing their concentration rather than simply masking them with fragrances.
Besides paper pulp mills, wastewater treatment plants, titanium dioxide manufacturing plants, and landfills also produce odors. These sources each have their own unique smells.
Large paper and titanium dioxide manufacturers have repeatedly used Angel air purification products to control ambient odors.
All these problems in every factory area can be addressed with Angel products.
The Four Major Odor Sources at Paper Mills
The plus side of Angel's products
Safe
No contact with pulp or paper production — zero impact on product quality
Effective
Methyl mercaptan reduced 80%+ — below the odor detection threshold
Professional
Validated by academic institutions and SGS + Intertek units
Natural
Plant formula does not affect biological wastewater treatment; effluent stays compliant
Digester Area Exhaust Treatment | TRS Compound Decomposition
Kraft digestion is the primary source of TRS (Total Reduced Sulfur) compounds. Angel atomizes enzyme solution into the digester area exhaust ducts — H₂S and methyl mercaptan are decomposed before exhaust gas leaves the facility, supporting air emission compliance.
Wastewater Area Odor Control | Aeration Basin & Sludge Zone Coverage
Paper mill wastewater carries high concentrations of lignin and organics, emitting odors continuously during treatment. Angel installs ultrasonic mist nozzles along aeration basins and sludge dewatering areas — droplets of just 1–10 microns stay suspended longer for maximum contact with odor molecules, without affecting biological treatment efficiency.
How to Get Started | Site Survey & Ultrasonic Mist System Design
Angel engineers survey odor sources and concentration distribution on site, then plan nozzle positions and piping. The atomization system operates fully automatically, with spraying frequency adjustable according to time periods, and installation requires no downtime.
High-pressure microfog are the primary methods for eliminating odor sources, including pulp tanks, binders, recovery plants, pulpers, cooling towers and exhaust stacks. Combine distribution systems to create a complete paper mill odor control program.
