India's top wet scrubber manufacturers and suppliers include Par Boiler Pvt. Ltd., Thermax, Enviro Concepts, GTS Enviro India, Enviropol Engineers, Ion Exchange, and Clean Air Power. These companies design and supply Venturi scrubbers, packed tower scrubbers, spray tower scrubbers, and multi-stage wet scrubber systems for chemical, pharmaceutical, fertilizer, boiler flue gas, textile, and food processing applications. When selecting a wet scrubber manufacturer, evaluate scrubber type fit for your contaminant (PM vs acid gas), gas volume capacity, CPCB compliance documentation, scrubbing chemistry specification, and local service capability.
Air pollution control is not a generic engineering problem. A chemical plant venting HCl from a reactor has a fundamentally different emission control challenge from a textile plant managing boiler flue gas particulate or a pharmaceutical facility controlling solvent vapours from a drying operation. Each situation requires a specifically designed solution and the wrong equipment choice is worse than no equipment at all, because it creates a false sense of compliance while emissions continue above consent limits.
Wet scrubbers occupy a specific and important position in the air pollution control toolkit: they are the technology of choice when the gas stream contains soluble acid gases, when the particulate is sticky or hygroscopic and would blind a fabric filter, or when simultaneous gas and particulate removal is required in a single system. This guide covers how wet scrubbers work, what types are available, which manufacturers in India supply them with genuine engineering capability, and how to select the right system for your specific process.
A wet scrubber system is an air pollution control device that removes particulate matter, acid gases (HCl, SO₂, HF, NH₃), and industrial fumes from exhaust gas streams by contacting the gas with a scrubbing liquid typically water or a chemical solution such as sodium hydroxide, sulphuric acid, or sodium hypochlorite. Contaminants are captured through physical absorption (particulate into liquid droplets) or chemical reaction (acid gases neutralised by alkali solution). Cleaned gas exits through the outlet and stack. Wet scrubbers are particularly valuable when both particulate and acid gas control are required simultaneously, or when the gas stream characteristics make dry filtration impractical.
The working principle of a wet scrubber is direct contact between the contaminated gas stream and a scrubbing liquid. The efficiency of this contact determined by the surface area between gas and liquid, the residence time, and the chemistry of the scrubbing solution determines what fraction of the contaminant is captured.
Gas entry: Contaminated exhaust gas enters the scrubber through the inlet duct. Gas velocity and temperature at entry determine the scrubber sizing the internal cross-section must be large enough to reduce velocity to the designed scrubbing zone contact velocity.
Liquid contact zone: The scrubbing liquid is introduced through spray nozzles in spray towers, through venturi injection in venturi scrubbers, or as downflowing liquid over packing material in packed towers to create maximum gas-liquid contact area. Particles collide with liquid droplets and are captured. Soluble gases dissolve into the liquid phase and react with the chemical reagent.
Liquid-gas separation: The gas-liquid mixture exits the contact zone and passes through a mist eliminator a mesh pad or chevron geometry that coalesces and removes entrained liquid droplets from the gas. This prevents liquid carryover into the clean gas stack.
Effluent management: The scrubbing liquid, now containing the captured contaminants, drains to a sump below the scrubber. It is either recirculated (with makeup liquid and chemical dosing to maintain reagent concentration) or discharged for treatment. The effluent must be treated before discharge to meet liquid effluent consent conditions.
For the complete technical reference on wet scrubber working principles and types, see our detailed guide on wet scrubber working principle, types, and industrial applications.
| Type | PM Efficiency | Gas Removal | Pressure Drop | Best Application |
|---|---|---|---|---|
| Packed Tower | Moderate | Very High (99%+) | Medium | HCl, SO₂, HF, NH₃, Cl₂ absorption |
| Venturi | 85 – 99% | Moderate | High | High PM loading, sticky dust, high-temp gas |
| Spray Tower | 60 – 80% | Low | Very Low | Coarse PM, pre-cooling, pre-scrubbing |
| Cyclonic | 80 – 92% | Low | Medium | Medium PM, compact footprint |
| Multi-Stage | 95 – 99%+ | High | Medium-High | Combined PM + acid gas control |
Par Boiler Pvt. Ltd. is one of the most established air pollution control equipment manufacturers in India, supplying wet scrubber systems Venturi scrubbers, packed tower scrubbers, spray scrubbers, and multi-stage systems alongside its core industrial boiler product range. With over 25 years of manufacturing experience from Ahmedabad, the company designs wet scrubbers for chemical, pharmaceutical, boiler flue gas, textile, and food processing applications.
The key advantage of sourcing wet scrubbers from Par Boiler for plants that also operate industrial boilers is design integration. When the same engineering team designs the boiler, air pollution control equipment, and ash handling system, the wet scrubber is sized for the boiler's actual flue gas temperature, volume, and particulate loading rather than a generic specification. This eliminates the interface problems that arise when separate suppliers are used for the boiler and emission control equipment.
Par Boiler's wet scrubber systems are manufactured in PP (polypropylene), FRP (fibre-reinforced plastic), and stainless steel construction depending on the chemical nature of the gas stream, and are designed to meet current CPCB and State PCB emission norms with commissioning support and after-sales service through a national service network.
Best for: Industrial boiler flue gas scrubbing, chemical and pharmaceutical acid gas control, medium to large industrial wet scrubber applications in Gujarat and pan-India.
Need a wet scrubber matched to your specific gas stream and CPCB requirements? Par Boiler's engineering team reviews your gas composition, flow rate, and consent conditions before recommending a system. Contact Par Techno-Heat Pvt. Ltd. for a free technical consultation.
GTS Enviro is a dedicated air pollution control equipment manufacturer with a product range covering wet scrubbers, dry scrubbers, and combined systems for chemical, pharmaceutical, and industrial applications. Known for premium quality at competitive pricing, they serve both domestic and export markets.
Best for: Chemical and pharmaceutical acid gas scrubbing applications requiring reliable packed tower and multi-stage designs.
Thermax supplies wet scrubbers as part of a comprehensive air pollution control portfolio, with particular depth in large-scale FGD (flue gas desulphurisation) wet scrubbing for power plants and cement industries where SO₂ control is a primary requirement. For a wider view of India's boiler manufacturing landscape, our roundup of top 10 boiler manufacturers in India is a useful market reference.
Best for: Large-scale SO₂ and PM control in power plants, cement, and large chemical complexes requiring full APC system integration.
Enviropol specialises in industrial air pollution control with a focus on wet gas scrubbers for maximum efficiency at low maintenance. Their compact designs are widely used in electroplating, chemical, and food processing applications where space is limited and acid fume control is critical.
Best for: Electroplating, chemical fume control, and food processing applications requiring compact, low-maintenance wet scrubber designs.
Enviro Concepts specialises in customised air pollution control with FRP and PP construction packed tower and Venturi scrubbers for chemical, pharmaceutical, and electroplating applications. Their engineering team specifies scrubbing chemistry around each specific gas composition.
Best for: Custom acid gas scrubbing for pharma, specialty chemical, and electroplating operations with complex gas compositions.
Ion Exchange brings combined water treatment and air pollution control expertise to wet scrubber applications, with particular strength in managing both the gas-phase performance and the liquid effluent treatment from the scrubbing system an important consideration for plants where scrubber effluent chemistry is complex.
Best for: Applications where scrubber liquid effluent treatment and management is as important as the gas-phase performance.
| Manufacturer | Location | Key Products | Best For | Core Strength |
|---|---|---|---|---|
| Par Boiler Pvt. Ltd. | Ahmedabad | Venturi, packed tower, spray, multi-stage | Boiler + APC integrated supply | 25+ years, custom engineering, boiler integration |
| GTS Enviro India | Pan-India | Packed tower, multi-stage wet scrubbers | Chemical, pharma, export market | Premium quality, competitive pricing |
| Thermax | Pune | FGD wet scrubbers, full APC systems | Power plant, cement, large SO₂ control | Large-scale APC engineering |
| Enviropol | Pan-India | Compact wet gas scrubbers | Electroplating, chemical fume, food | Compact design, low maintenance |
| Enviro Concepts | Mumbai | FRP/PP packed tower, Venturi | Pharma, specialty chemical, electroplating | Custom scrubbing chemistry specification |
Some of these same industries rely on complementary particulate control equipment see our guide on industrial dust collector manufacturers in India for dry particulate applications alongside wet scrubbing.
| Industry | Contaminants | Scrubber Type | Scrubbing Chemistry |
|---|---|---|---|
| Chemical & Pharma | HCl, SO₂, HF, NH₃, Cl₂, organic fumes | Packed Tower | NaOH for acids; H₂SO₄ for NH₃ |
| Industrial Boiler (solid fuel) | Flue gas PM, SO₂ | Venturi / Spray Tower | Water / NaOH for SO₂ |
| Fertilizer Industry | NH₃, HF, fluorine compounds | Packed Tower | H₂SO₄ for NH₃; NaOH for HF |
| Electroplating | Chromic acid mist, HCl, HCN | Packed Tower | NaOH, reducing agent for Cr |
| Textile & Dyeing | Acid fumes, PM, HCl | Packed Tower / Multi-stage | NaOH solution |
| Paper & Pulp | H₂S, chlorine, PM | Packed Tower, Venturi | NaOH, NaOCl for H₂S |
| Sugar & Distillery | Bagasse dust, SO₂, odour | Venturi / Spray Tower | Water, NaOH |
| Metal & Foundry | Metal fumes, dust, SO₂ | Venturi / Cyclonic | Water |
| Ceramic & Brick | Dust, HF, fluorine | Venturi / Packed Tower | NaOH for HF |
| Food Processing | Odour, organic fumes, PM | Spray Tower / Packed Tower | Water / NaOCl for odour |
For dry, non-sticky particulate at moderate temperature, a bag filter or, at very large scale, an electrostatic precipitator is often the simpler and more economical choice. The table below sets out when each technology fits best.
| Condition | Choose Wet Scrubber | Choose Bag Filter |
|---|---|---|
| Gas stream contains acid gases | ✔ Wet scrubber packed tower for chemical absorption | ✗ Bag filter cannot absorb gases |
| Dust is sticky or hygroscopic | ✔ Wet scrubber handles sticky particulate | ✗ Sticky dust blinds filter bags |
| Gas stream is hot and moist | ✔ Wet scrubber works well with moisture | ✗ Moisture can condense and blind bags |
| Dry particulate only, moderate temperature | ✗ Wet scrubber generates liquid effluent unnecessarily | ✔ Bag filter simpler and no effluent |
| No liquid effluent treatment available | ✗ Wet scrubber requires effluent treatment | ✔ Bag filter dry system, no effluent |
| Combustible dust risk | ✔ Wet scrubber eliminates explosion risk | ✗ Requires ATEX design |
| Scrubber Type | Gas Flow | Material | Approx. Price (₹) |
|---|---|---|---|
| Spray Tower (small) | 1,000 – 5,000 m³/hr | PP / FRP | ₹1.5 lakh – ₹6 lakh |
| Venturi Scrubber | 2,000 – 20,000 m³/hr | MS / FRP | ₹3 lakh – ₹20 lakh |
| Packed Tower (medium) | 1,000 – 15,000 m³/hr | PP / FRP / SS | ₹4 lakh – ₹28 lakh |
| Multi-Stage System | 5,000 – 50,000 m³/hr | FRP / SS | ₹15 lakh – ₹85 lakh+ |
Prices are indicative 2026 estimates. Actual cost depends on gas composition, flow rate, required removal efficiency, material, and site conditions.
Shortlisting wet scrubber suppliers for your plant? Par Boiler's engineering team reviews your gas stream composition, flow rate, and CPCB consent conditions before any system is proposed. Contact Par Techno-Heat Pvt. Ltd. here.
These wet scrubber-specific tasks complement the broader routine covered in our industrial boiler maintenance checklist, useful where the scrubber is integrated with a solid fuel boiler.
A wet scrubber system is an air pollution control device that removes particulate matter, acid gases, and industrial fumes from exhaust gas streams by contacting the gas with a scrubbing liquid. Contaminants are captured through physical absorption (particulate into droplets) or chemical reaction (acid gases reacting with alkaline scrubbing solution). Cleaned gas exits through a mist eliminator and stack outlet. Wet scrubbers are the standard technology for simultaneous PM and acid gas control in chemical, pharmaceutical, fertilizer, and industrial boiler applications.
Par Boiler Pvt. Ltd., GTS Enviro India, Thermax, Enviropol Engineers, Enviro Concepts, and Ion Exchange are among the most trusted. The best manufacturer depends on your contaminant type, gas flow rate, required removal efficiency, and whether you need the scrubber integrated with boiler or process equipment.
A packed tower wet scrubber flows gas and scrubbing liquid counter-currently through a bed of packing material (Raschig rings, saddles, or structured packing). The packing surface provides high liquid-gas contact area for efficient acid gas absorption achieving 95–99.9% removal for highly soluble gases including HCl, SO₂, HF, and NH₃. It is the standard design for chemical, pharmaceutical, fertilizer, and electroplating acid gas control applications.
A Venturi scrubber accelerates contaminated gas through a narrow throat and injects scrubbing liquid at the high-velocity zone, creating intense gas-liquid contact that captures high particulate loading, sticky dust, and hot, high-moisture gas streams. Used for industrial boiler flue gas with high dust content, foundry exhaust, and any application where particulate would clog or damage a fabric filter. Removal efficiency ranges from 85–99% for particulate depending on particle size and Venturi pressure drop.
Scrubbing chemistry depends on the contaminant: NaOH (sodium hydroxide) solution for HCl, SO₂, and HF absorption; H₂SO₄ (sulphuric acid) for NH₃ absorption; NaOCl (sodium hypochlorite) for H₂S and Cl₂ oxidation; CaCO₃ (limestone slurry) for large-scale SO₂ FGD systems; water for simple particulate scrubbing where no chemical reaction is needed. pH control of the scrubbing liquor is critical exhausted or incorrectly pH-controlled liquor absorbs very little gas.
Wet scrubbers do not require direct CPCB product approval. The industrial plants installing them are subject to CPCB and State PCB emission standards specified in their consent-to-operate conditions the same statutory framework covered in our boiler safety guidelines for industries. The scrubber must be designed and operated to keep stack emissions within the specified outlet limits typically HCl below 10–50 mg/Nm³, SO₂ below 500–2,000 mg/Nm³, and PM within the applicable limit. The manufacturer should provide emission test records from comparable installations confirming compliance capability.
Polypropylene (PP) and FRP (fibre-reinforced plastic) are standard for most acid gas scrubbing applications. SS 316L is used for higher-temperature service or specific chemical compatibility requirements. Carbon steel with rubber lining is used in some large-scale applications. Material selection depends on the gas temperature, concentration, and chemical composition of the scrubbing liquid and contaminant gas stream.
Wet scrubber prices range from ₹1.5 lakh for small spray towers (1,000–5,000 m³/hr) to ₹85 lakh and above for large multi-stage systems (50,000+ m³/hr). A medium packed tower scrubber handling 5,000–15,000 m³/hr for acid gas control typically costs ₹6–₹18 lakh depending on material, packing type, and pump specification.
Wet scrubber efficiency is measured as the percentage of inlet contaminant (PM by mass, or gas by concentration) removed from the gas stream. Packed tower scrubber efficiency for HCl, SO₂, and HF typically ranges from 95–99.9%. Venturi scrubber PM removal efficiency ranges from 85–99% depending on particle size and Venturi pressure drop. Performance is verified by inlet and outlet stack emission testing.
Yes. The scrubbing liquid that captures contaminants must be periodically discharged as liquid effluent. This effluent contains the captured particulate, dissolved gases, and reaction products from chemical scrubbing. Before discharge, the effluent must be treated to meet liquid effluent consent conditions typically through neutralisation (for acid or alkali effluent), sedimentation (for PM-laden effluent), and pH adjustment before discharge to a trade effluent system or ETP.
Yes. A multi-stage wet scrubber combines a Venturi or spray pre-scrubber stage for particulate removal with a packed tower second stage for acid gas absorption. This combined approach is used in applications such as boiler flue gas cleaning where both SO₂ and particulate must be controlled simultaneously to meet CPCB consent conditions. The Venturi removes bulk particulate before the gas enters the packed tower, protecting the packing from dust fouling.
Packed tower packing service life depends on gas composition, liquid chemistry, and fouling rate. Typical service life ranges from 3–7 years for moderate-duty applications with clean scrubbing chemistry to 1–2 years for highly fouling applications with high particulate carryover into the packing zone. Inspect packing annually through access hatches replace when visual inspection shows significant fouling, scale, or physical breakage that cannot be restored by water washing.
The mist eliminator removes liquid droplets from the gas stream before it exits the scrubber. A blocked or damaged mist eliminator allows scrubbing liquor to carry over into the clean gas stack causing visible liquid plume (a direct CPCB visible emission violation), contaminating downstream equipment, and potentially creating a slip pathway for contaminants that were absorbed into the liquid. Check mist eliminator condition and differential pressure monthly; clean or replace if differential pressure exceeds the design maximum.
A wet scrubber uses liquid contact to capture contaminants and produces liquid effluent. A dry scrubber injects dry reagent (lime, sodium bicarbonate) into the gas stream to react with acid gases, producing solid reaction products captured by a downstream filter. Wet scrubbers achieve higher acid gas removal efficiency (95–99.9%) than dry scrubbers (60–85%) but generate liquid effluent requiring treatment. Dry scrubbers avoid liquid effluent but at lower removal efficiency.
The scrubbing liquid pH and chemical reagent concentration determine acid gas removal efficiency. Measure pH daily and maintain within the specified range (typically pH 7–11 for NaOH scrubbing) by dosing concentrated reagent through an automatic dosing pump. Measure reagent concentration and conductivity weekly. Replace the scrubbing liquor completely when TDS buildup from captured contaminants reduces its absorption capacity below effective levels. A scrubber running on exhausted or wrong-pH liquor absorbs very little acid gas despite appearing mechanically functional.
Yes. Par Boiler Pvt. Ltd. supplies integrated boiler and air pollution control equipment packages including Venturi scrubbers, packed tower scrubbers, bag filters, cyclone separators, and ash handling systems — designed as a coordinated system from a single engineering team. This eliminates the interface design problems that arise when different suppliers handle the boiler and emission control equipment independently.
Yes. Packed tower wet scrubbers in FRP or SS construction are widely used in pharmaceutical manufacturing for controlling HCl, solvent vapours, and reactive gases from reactors and process vessels. Clean, non-contaminating construction is standard for pharma applications. The packed tower design achieves 99%+ removal for soluble gases at low pressure drop, making it practical for installation in pharmaceutical plant utility systems.
Indian wet scrubber manufacturers design systems from as small as 500 m³/hr for laboratory and small pharmaceutical applications up to 500,000 m³/hr+ for large power plant FGD systems. For most industrial applications chemical, pharmaceutical, boiler flue gas, textile the practical range is 1,000 m³/hr to 50,000 m³/hr, with Par Boiler designing systems in this range as standard.
Indian manufacturers offer 30–50% lower capital cost than equivalent imported systems, faster delivery (6–12 weeks versus 4–6 months), local service engineers available within 24–48 hours, packing and nozzle spares available without import lead time, and design compliance with Indian CPCB standards from the outset rather than adaptation from foreign specifications. PP and FRP fabrication for corrosive service is a particular strength of experienced Indian APC equipment manufacturers.
Provide the following data to any wet scrubber manufacturer for an accurate quotation: gas flow rate (m³/hr or Nm³/hr at operating temperature), gas temperature at scrubber inlet, contaminant type and inlet concentration (mg/Nm³ for PM; ppm or mg/Nm³ for gases), required outlet concentration from CPCB consent, site location and available space dimensions. Par Boiler accepts this data and provides a process design document and quotation as part of its project development process at no cost.
Par Techno-Heat Pvt. Ltd. designs and manufactures Venturi scrubbers, packed tower scrubbers, spray towers, and multi-stage wet scrubber systems PP, FRP, and SS construction for chemical, pharmaceutical, boiler, textile, and food processing applications across India.
Share your gas flow, temperature, and contaminant data and receive a process-specific system design and quotation.
