Acid & Alkali Waste Gas Solution Cases
YFEP provides professional acid alkali waste gas treatment solutions for
industries generating acidic or alkaline exhaust streams— including HCl, SO2, HF, ammonia (NH3), chlorine, and nitrogen oxides (NOx).
Our integrated scrubber systems combine neutralization absorption, water washing,
and demisting to achieve 95–99.9% removal efficiency while meeting strict environmental standards.
Chemical Enterprise — Multi-Pollutant Acid Gas & VOCs Treatment
| Pollutants | VOCs, HCl, SO₂, Cl₂, etc. |
|---|---|
| Inlet Concentration | 500 mg/m³ |
| Gas Flow Rate | 60,000 m³/h |
| Treatment Process | 3-Stage Alkaline Scrubbing → Demisting → Activated Carbon Adsorption → 25m Stack |
| Removal Efficiency | 98% |
A large-scale chemical manufacturing plant discharging a complex mixture of volatile organic compounds and corrosive acid gases including hydrogen chloride, sulfur dioxide, and chlorine at concentrations up to 500 mg/m³. We engineered a comprehensive multi-barrier treatment system featuring three alkaline scrubbing towers in series for progressive acid gas neutralization, followed by a high-efficiency mist eliminator to capture aerosolized droplets, activated carbon adsorbers as a polishing stage for residual VOCs, and a 25-meter exhaust stack for safe dispersion. The three-stage alkaline scrubbing configuration ensures that even peak acid gas loads are fully neutralized before reaching the carbon beds, extending their service life significantly.
Pharmaceutical Pilot Plant — Acid-Base & VOCs Exhaust Treatment
| Pollutants | Acid gases, Alkaline gases, VOCs |
|---|---|
| Gas Flow Rate | 3,000 m³/h |
| Treatment Process | 2-Stage Wet Scrubbing (Acid-Base Neutralization) → Activated Carbon Adsorption |
| Removal Efficiency | 98% |
A pharmaceutical pilot-scale production facility generating intermittent exhaust streams containing both acidic and alkaline fumes along with organic solvent vapors during drug synthesis and formulation processes. The relatively low flow rate of 3,000 m³/h but highly variable composition required a flexible treatment approach. We designed a compact two-stage counter-current wet scrubbing system where the first stage targets acidic components and the second stage handles any residual alkaline species, achieving efficient pH-neutralization across varying load conditions. A downstream activated carbon adsorption unit provides final polishing for organic solvent vapors. The entire skid-mounted system fits within the pilot plant’s constrained footprint while maintaining ease of maintenance access for filter and carbon replacement. This project demonstrates our capability to deliver effective air pollution control solutions even for small-scale operations with complex, variable exhaust characteristics.
Pharmaceutical Chemical Enterprise — NOx & NO₂ Treatment
| Pollutants | Nitrogen Oxides (NOx, NO₂) |
| Inlet Concentration | 215 kg/h |
| Gas Flow Rate | 3,000 m³/h |
| Treatment Process | 6-Stage High Tower Water Absorption → 3-Stage Alkaline Wash |
| Removal Efficiency | 99.50% |
A pharmaceutical chemical manufacturer discharging nitrogen oxides (NOx, NO₂) at significant concentrations required a high-efficiency absorption system to meet stringent emission limits. We engineered a multi-stage treatment train featuring six high towers for water absorption of soluble nitrogen oxides, followed by three-stage alkaline washing to ensure complete removal of remaining acidic components. The 9-tower cascade configuration delivers exceptional removal efficiency of 99.50%, making it suitable for applications where every percentage point matters.
Metallurgical Enterprise Dust & Sulfuric Acid Mist Treatment
| Pollutants | Dust, Sulfuric Acid Mist |
| Gas Flow Rate | 15,000 m³/h |
| Treatment Process | Cyclonic Dynamic Scrubber → Acid Mist Absorption Tower |
| Removal Efficiency | 90% |
A metallurgical facility generating particulate matter and sulfuric acid mist from smelting operations required a robust scrubbing system capable of handling high dust loads while achieving effective acid mist removal. We delivered a two-stage solution combining a cyclonic dynamic scrubber for initial dust and coarse droplet removal, followed by a packed-bed acid mist absorption tower for fine mist capture. The system operates continuously with minimal maintenance requirements.
For detailed specifications of our acid gas scrubber systems — including packed bed scrubbers, spray towers, and custom PVC/PP scrubbing units — visit our equipment catalog. Each system is engineered for the specific concentration and flow rate of your acid or alkaline exhaust stream.
YFEP has delivered over 500 industrial gas treatment projects worldwide, with a 99%+ compliance rate against local emission standards. For facilities dealing with industrial odor control challenges alongside acid gas emissions, we offer integrated multi-pollutant treatment systems. For facilities dealing with hydrogen chloride and other acid gas exposure risks, proper engineering controls are critical to meeting occupational safety standards.
Learn more about the science behind scrubber technology in our in-depth guide: What Is a Wet Scrubber and How Does It Work?.
Many acid and alkali waste gas streams coexist with volatile organic compounds (VOCs). YFEP also provides integrated VOCs treatment solutions for combined pollution control requirements.
Facing Acid Mist or Corrosive Gas Emissions?
Tell us about your exhaust gas composition, concentration, and flow rate. Our engineering team will design a custom scrubbing solution and provide a preliminary proposal within 24 hours.
Frequently Asked Questions
What types of acid and alkali gases can be treated?
Our systems handle HCl (hydrogen chloride), sulfuric acid mist (H₂SO₄), HF (hydrofluoric acid), NH₃/ammonia, Cl₂/chlorine, NOₓ/nitrogen oxides, and mixed acid-alkaline exhaust streams. Each gas requires specific scrubbing media and chemical reagents — we design accordingly based on your exact exhaust composition.
How does an acid gas scrubber work?
Acid-laden exhaust gas enters the bottom of a scrubber tower and flows upward through packing media while a neutralizing liquid (typically NaOH, Ca(OH)₂, or water) is sprayed from the top. The counter-current contact absorbs acidic components into the liquid phase, producing clean air at the tower outlet and neutralized effluent at the bottom for safe discharge or recycling.
What is the typical removal efficiency?
Properly designed acid gas scrubbers achieve 95–99.9% removal efficiency for HCl, SO₂, and HF. Actual performance depends on inlet concentration, gas flow rate, liquid-to-gas ratio (L/G), packing selection, and residence time. YFEP guarantees compliance with your local emission limits.
Do you offer customized solutions?
Yes — every YFEP acid alkali treatment system is custom-engineered based on your exhaust composition, volume, space constraints, and regulatory requirements. From pilot testing to installation and commissioning, we handle the complete project lifecycle. Contact us for a free technical assessment and proposal within 48 hours.