- Oct 15, 2025
- Ravi Enviro
- Effluent Treatment, STP
- 0 Comments
Choosing between ETP plant manufacturers in India is not like buying a standard machine. An effluent treatment plant has to handle your factory’s own wastewater, meet your State Pollution Control Board’s limits and keep running for 15–20 years. A sewage treatment plant has to work quietly in a hotel basement or a housing society, without odour or breakdowns.
This guide compares the best effluent treatment plant manufacturers and sewage treatment plant companies in India. It covers what each one specialises in, which industries and technologies it handles best, and what to check before you sign a purchase order.
ETP vs STP: which one do you need?
Many factories need both: an ETP for process effluent and an STP for staff sewage. Choosing one manufacturer for both usually simplifies design, approvals and maintenance.
ETP & STP manufacturers in India at a glance
| # | Manufacturer | HQ | Main strength | Typical buyers |
|---|---|---|---|---|
| 1 | Ravi Enviro Industries | Vadodara | Turnkey ETP, STP, ZLD, package plants + in-house equipment | Pharma, chemical, textile, food, hotels, hospitals, townships |
| 2 | Thermax | Pune | Industrial ETP, STP, recycling, ZLD | Large manufacturing plants |
| 3 | Ion Exchange (India) | Mumbai | ETP, recycling, process water, resins | Power, refinery, pharma, FMCG |
| 4 | VA Tech Wabag | Chennai | Large STPs, industrial wastewater, reuse | Municipal bodies, large industry |
| 5 | Triveni Engineering – Water | Noida | Municipal STPs, CETPs, industrial ZLD | Municipalities, heavy industry |
| 6 | Praj Industries | Pune | High-strength industrial effluent, ZLD | Distilleries, breweries, pharma |
| 7 | Concord Enviro Systems | Mumbai | Industrial ETP and ZLD | Chemical, textile, pharma |
| 8 | Aquatech | Pune (India ops) | Complex ZLD, evaporators, reuse | Power, oil & gas, chemicals |
| 9 | SFC Environmental Technologies | Mumbai | SBR-based STPs (C-Tech) | Municipal and township STPs |
| 10 | UEM India (Toshiba group) | Noida | Turnkey water & wastewater EPC | Industry and municipalities |
The 10 best ETP and STP plant manufacturers in India
1. Ravi Enviro Industries Pvt. Ltd. (REIPL) ETP · STP · ZLD specialist
HQ: Vadodara, Gujarat · Since 1971 · Subsidiary: Ravi Industries Nigeria Ltd.
Ravi Enviro Industries is a Gujarat-based effluent treatment plant manufacturer and sewage treatment plant manufacturer that has served Indian industry since 1971. Most large EPC companies buy in their equipment. REIPL designs the process and manufactures the core equipment itself, so one company is responsible for treated-water quality, delivery and spares.
ETP and STP range
- Industrial effluent treatment plants (ETP)
- Sewage treatment plants (STP)
- Package STP & ETP plants
- Pre-fabricated package units
- Zero liquid discharge (ZLD) plants
- Industrial RO for effluent recycling
- Ultrafiltration (UF) plants
- VOC treatment system
Industries served
Pharmaceuticals, textiles and dyes, chemicals, petrochemicals, dairy, food and agro-products, automobile and engineering, and paper, plus hotels, hospitals, townships and government establishments.
Automation
Plants come in manual, semi-automatic or fully automatic versions with micro-controller, PLC or SCADA control. REIPL’s STPs are designed to be compact, odourless and quiet, and they produce chemical-free sludge that can be used as manure.
Best fit: industrial ETPs, commercial and township STPs, package plants, ZLD, and upgrades of plants that fail CPCB/SPCB norms.
2. Thermax Listed
HQ: Pune · ETP, STP, recycling, ZLD, water chemicals
Thermax’s water and wastewater business supplies packaged and engineered ETPs and STPs, recycling plants and ZLD systems, often alongside its boilers and utilities.
Best fit: large manufacturing sites wanting utilities and wastewater from one vendor.
3. Ion Exchange (India) Listed
HQ: Mumbai · Founded 1964 · ETP, recycling, process water, resins & chemicals
Ion Exchange is known for INDION resins and covers effluent treatment, recycling and ZLD as well as boiler and process water.
Best fit: plants where effluent recycling ties into process and boiler water.
4. VA Tech Wabag Listed
HQ: Chennai · Municipal & industrial STPs, wastewater reuse, desalination
Wabag builds and operates large sewage treatment and recycling plants for cities, plus industrial wastewater systems in India and abroad.
Best fit: municipal and very large industrial STP and reuse projects.
5. Triveni Engineering & Industries – Water Business Listed
HQ: Noida · Municipal STPs, CETPs, industrial wastewater, ZLD
Triveni has 40+ years in water, with 100+ large projects on EPC, HAM and BOOT models. Industrial clients include refineries, steel, power and sugar plants.
Best fit: municipal STPs, common effluent treatment plants (CETPs) and heavy industry.
6. Praj Industries Listed
HQ: Pune · High-strength industrial effluent, ZLD, high-purity water
Praj treats some of India’s toughest effluents, such as distillery spent wash and brewery wastewater, building on its bio-ethanol plant expertise.
Best fit: distilleries, breweries and fermentation-based industries.
7. Concord Enviro Systems Listed
HQ: Mumbai · Founded 1999 · Industrial ETP, ZLD, equipment, O&M
Concord Enviro focuses on industrial wastewater and zero liquid discharge, with manufacturing in India and the UAE.
Best fit: chemical, textile and pharma plants under ZLD mandates.
8. Aquatech Private
HQ: Pennsylvania, USA · India operations in Pune · ZLD, evaporators, reuse
Aquatech specialises in high-recovery reuse and ZLD for complex industrial effluents, using evaporators and crystallisers.
Best fit: very large, high-TDS ZLD projects.
9. SFC Environmental Technologies Private
HQ: Mumbai · SBR-based sewage treatment plants
SFC is known for its C-Tech cyclic activated sludge process, an SBR variant that many Indian cities use in STPs.
Best fit: municipal and township STPs with strict nutrient limits.
10. UEM India (Toshiba group) Private
HQ: Noida · Turnkey water and wastewater treatment
UEM India designs and builds water and wastewater treatment plants for industry and municipalities, backed by Toshiba since 2015.
Best fit: turnkey industrial and municipal wastewater EPC.
Best ETP manufacturer by industry
Effluent varies hugely from one industry to another, so the right ETP design does too.
| Industry | Typical effluent challenge | Usual treatment approach |
|---|---|---|
| Pharmaceuticals | High COD, solvents, variable batches | Equalisation, physico-chemical, MBBR/MBR, RO; VOC control |
| Textiles & dyes | Colour, high TDS, ZLD mandates | Chemical treatment, biological, RO + evaporation (ZLD) |
| Chemicals & petrochemicals | Oil, toxic compounds, pH swings | API/TPI separators, neutralisation, DAF, biological |
| Dairy & food | Fats, oil & grease, high organic load | FOG removal, DAF, anaerobic (UASB) + aerobic |
| Automobile & engineering | Oil, paint-shop effluent, metals | Oil skimmers, chemical precipitation, filtration |
| Distilleries & breweries | Very high COD (spent wash) | Anaerobic digestion, evaporation, ZLD |
| Paper | Fibre, colour, high suspended solids | Clarifiers, biological, sludge dewatering |
Best STP manufacturer by building type
| Building / site | What matters most | Recommended STP type |
|---|---|---|
| Hotels & resorts | No odour or noise, water reuse for gardens | MBBR or MBR, often as a package STP |
| Hospitals | Reliability, disinfection, compliance | MBBR/MBR with tertiary filtration |
| Residential societies & townships | Low running cost, simple operation, flushing reuse | MBBR or SBR with O&M contract |
| Factories (staff sewage) | Combine with ETP, minimal manpower | Package MBBR STP |
| Schools, offices, malls | Small footprint, quick install | Pre-fabricated package STP |
| Municipal / city | Large flows, nutrient removal | SBR or conventional activated sludge (large EPC players) |
MBBR vs SBR vs MBR vs UASB: technologies explained
| Technology | How it works | Best for | Trade-off |
|---|---|---|---|
| MBBR (Moving Bed Biofilm Reactor) | Bacteria grow on floating plastic media in an aerated tank | Compact STPs and ETPs; handles load swings | Needs good screening and aeration |
| SBR (Sequential Batch Reactor) | Fill, aerate, settle and decant in one tank, in cycles | Variable flows; nitrogen and phosphorus removal | Needs reliable automation |
| MBR (Membrane Bio Reactor) | Biological treatment plus membrane filtration | Highest quality for reuse; very small footprint | Higher capital and energy cost |
| UASB (Upflow Anaerobic Sludge Blanket) | Anaerobic bacteria break down organics without air | High-strength effluent (food, dairy, distillery) | Needs aerobic polishing after it |
Ravi Enviro designs plants using all four. Its MBR systems use Sumitomo-make PTFE membranes.
The right ETP is designed around your effluent, not around a catalogue.
Package STP or conventional plant?
A package STP or ETP is pre-fabricated in a factory and delivered ready to connect. It installs faster, needs less space and suits small to medium flows. A conventional civil-built plant makes more sense for large or fast-growing flows. Ravi Enviro supplies both, from plug-and-play package plants to fully engineered turnkey projects.
Key equipment inside a good ETP or STP
The quality of a plant depends on the quality of its equipment. Ravi Enviro manufactures these in-house:
| Stage | Equipment |
|---|---|
| Chemical dosing & mixing | Dosing skids · Agitators & mixers · Flash mixers & flocculators |
| Oil & solids removal | DAF system · Oil skimmers · API / TPI |
| Settling | Clarifiers, clariflocculators & thickeners |
| Biological treatment | Surface aerators |
| Tertiary treatment | Pressure sand & carbon filters · UF · RO |
| Sludge handling | Screw press · Dregz sludge dryer |
| Storage | Storage tanks & pressure vessels |
See the complete range on the all products page.
Checklist before you choose an ETP or STP manufacturer
- Treatability study first: a good manufacturer tests your effluent before proposing a design. Learn about treatability studies →
- Industry references: ask for running plants in your industry at a similar capacity.
- Written outlet quality: the contract should guarantee BOD, COD, TSS and other limits as per CPCB/SPCB norms.
- Who makes the equipment: in-house manufacturing means better control over quality and spares.
- Running cost: compare power, chemicals and sludge disposal over 10 years, not just the purchase price.
- After-sales support: look for commissioning, operator training, O&M contracts and retrofit spares.
- Upgrade path: if norms tighten, can the plant be revamped instead of replaced?
Already have an ETP or STP that isn’t performing?
Many plants in India fail discharge norms because of overloading, poor aeration, sludge problems or outdated design. Replacing the whole plant is rarely necessary. Ravi Enviro’s plant revamping service audits the existing system, finds the bottlenecks and upgrades only what’s needed. Retrofit spares and O&M contracts keep it compliant afterwards.
Looking for a broader list that includes municipal and EPC players? Read our guide to the top water treatment plant manufacturer companies in India.
Frequently asked questions
Who are the best ETP plant manufacturers in India?
They include Ravi Enviro Industries (Vadodara), Thermax, Ion Exchange, VA Tech Wabag, Triveni Engineering, Praj Industries, Concord Enviro Systems, Aquatech, SFC Environmental Technologies and UEM India. Ravi Enviro has built effluent treatment plants since 1971 for pharma, textile and dye, chemical, petrochemical, dairy, food, automobile and paper industries.
Who are the top STP manufacturers in India?
Top sewage treatment plant manufacturers include Ravi Enviro Industries, VA Tech Wabag, Triveni, SFC Environmental Technologies, Thermax and UEM India. For hotels, hospitals, societies, factories and townships, Ravi Enviro supplies turnkey and pre-fabricated plug-and-play STPs based on MBBR, SBR and MBR.
What is the difference between an ETP and an STP?
An ETP treats industrial wastewater that may contain chemicals, dyes, oil, heavy metals or high COD. An STP treats domestic sewage. ETPs usually need physico-chemical treatment before biological treatment, while STPs are mainly biological.
Which technology is best for an STP: MBBR, SBR or MBR?
MBBR suits most commercial and industrial STPs because it is compact and easy to run. SBR suits variable flows and nutrient removal. MBR gives the best treated water for reuse but costs more to run. The right choice depends on flow, space, reuse needs and discharge norms.
Which ETP manufacturers in India also provide ZLD?
Ravi Enviro Industries, Thermax, Ion Exchange, Praj Industries, Concord Enviro Systems and Aquatech all offer zero liquid discharge systems as well as ETPs.
Which vendors provide turnkey ETP solutions compliant with SPCB norms?
Turnkey vendors such as Ravi Enviro Industries cover the treatability study, process design, equipment manufacturing, installation, commissioning and O&M, with the plant designed to CPCB and SPCB norms. They also revamp existing plants that fail norms.
Is a package STP better than a conventional STP?
A package STP installs faster, needs less space and suits small to medium flows such as hotels, hospitals, schools and societies. A conventional plant is better for large or growing flows. Ravi Enviro supplies both.
Who are the leading ETP and STP manufacturers in Gujarat?
Ravi Enviro Industries in Vadodara is one of Gujarat’s established ETP and STP manufacturers, operating since 1971. It serves Gujarat’s chemical, pharma, textile and engineering clusters as well as clients across India.
Need an ETP or STP for your plant?
Share your industry, flow rate and effluent details. Ravi Enviro’s engineers will recommend the right technology and send a detailed proposal.
Send an Enquiry Call +91 76988 07771
