Air Pollution Control Measures (APCM) & Gas Scrubbing Solutions

Mitigating Acid Gases, VOCs, and Particulate Emissions

In the pharmaceutical, pesticide, and dye industries, managing gaseous emissions is a critical regulatory milestone. Industrial boilers, batch reactors, and process vents release highly aggressive, corrosive, and toxic gases, including Sulfur Dioxide (SO2), Hydrogen Chloride (HCl), Chlorine (Cl2), Ammonia (NH3), and volatile organic compounds (VOCs).

With State Pollution Control Boards (SPCBs) strictly enforcing Online Continuous Emission Monitoring Systems (OCEMS) and setting lower thresholds for stack emissions, generic solutions are a liability. We design, engineer, and install highly optimized Air Pollution Control Measures (APCM) and Multi-Stage Scrubbing Systems that guarantee absolute compliance with CPCB ambient air and stack emission norms.

Core Solution Spectrum

Our APCM portfolio ranges from particulate control for industrial utility boilers to highly complex mass-transfer systems for chemical synthesis processes:

1. Flue Gas Desulfurization (FGD) & Boiler APCM

Custom-engineered systems to treat flue gases from coal, biomass, or oil-fired boilers, dramatically reducing Particulate Matter (PM) and acid gas concentrations.

  • Particulate Capturing: Integration of high-efficiency Cyclones, Multi-Cyclones, and Pulse-Jet Bag Filters designed to operate under high temperatures and handle abrasive ash particles.
  • Flue Gas Scrubbing: Wet and semi-dry scrubbing configurations achieving up to 95%+ sulfur and acid gas removal efficiency before stack dispersion.


2. Water & Alkali Scrubbers

Engineered for the immediate neutralization of high-concentration inorganic acid gases (HCl, H2SO4, HF) and alkaline vapors (NH3) generated during chemical reactions.

  • Water Scrubbing Systems: Utilizing high-solubility thermodynamics to capture highly polar gases like Ammonia or Hydrogen Chloride efficiently, optimizing water consumption through closed-loop recirculation.
  • Alkali/Chemical Neutralization: Systems utilizing Caustic Soda (NaOH), Lime (Ca(OH)2), or Sodium Carbonate (Na2CO3) chemistry. Features automated pH-correction loops to maintain optimum scrubbing liquor alkalinity, ensuring constant neutralization without chemical wastage.


3. Multi-Stage Scrubbing Systems (Fractional & Sequential Absorption)

When process vents release a cocktail of complex gases—typical in pesticide synthesis or pharmaceutical API multi-product blocks—a single-stage scrubber fails. We deploy multi-stage, sequential mass-transfer towers:

  • Stage 1: Quenching & Primary Absorption: Drops incoming flue/process gas temperature and knocks down heavy particulates or highly water-soluble gases.
  • Stage 2: Chemical Absorption (Acidic/Alkaline): Targets specific gaseous pollutants via targeted chemical reactions (e.g., handling Cl2 or SO2).
  • Stage 3: Polishing / VOC Adsorption: Utilizes specialized scrubbing media or integrated activated carbon/oxidizer beds to capture trace odorous compounds and residual VOCs before final stack release.


Material Science & Engineering Integrity

The Chemical Resistance Guarantee: Because pesticide, pharma, and dye emissions are highly aggressive, we eliminate corrosion risks by selecting advanced materials of construction based on chemical compatibility. Our systems are built using PP-FRP (Polypropylene-Fibreglass Reinforced Plastic), PVDF-FRP, Dual Laminates, Hastelloy, or SS316L, matching your specific gas-stream temperature and chemistry.

  • Aerodynamic & Hydraulic Balancing: Complete system engineering including static pressure drop calculations, sizing of high-efficiency centrifugal FRP blowers, and mist eliminator profiles to prevent liquid carry-over.
  • Automation & Safety Loops: Integrated PLC controls for liquid-to-gas (L/G) ratios, automated makeup water dosing, dry-run protection for recirculation pumps, and gas leak detection alarms.
  • Turnkey Stack Designing: Designing and structural fabrication of MS-FRP/RCC stacks conforming to CPCB guidelines, equipped with safe sampling ports and platforms for seamless OCEMS integration.
San Envirotech