ETP Manufacturer Kolkata — West Bengal
Effluent treatment plant design, supply, and commissioning for Kolkata's industrial clusters — Haldia petrochemicals, Howrah engineering, Kalyani pharma, and food processing belts — with WBPCB-compliant treatment and ZLD capability
Industry Overview
ETP Manufacturer Kolkata — West Bengal
Kolkata and West Bengal present one of India's most industrially diverse and environmentally regulated wastewater treatment markets. Spans Envirotech has been supplying and commissioning ETPs, ZLD plants, and STPs for industries across West Bengal since 1993 — spanning food and beverage processing, pharmaceutical and API manufacturing, jute and textile mills, tanneries, and petrochemical facilities at Haldia.
The Kolkata metropolitan region and its surrounding industrial corridors — Howrah engineering belt, Dankuni logistics and chemical hub, Kalyani pharmaceutical cluster, and Falta Special Economic Zone — generate wastewater with widely varying characteristics. Effluent from Howrah's engineering and metal fabrication units contains heavy metals and cooling water blowdown. Pharmaceutical plants in Kalyani generate complex organic effluent with APIs and solvents requiring advanced biological and physical treatment. Kolkata's legacy tanneries in Tangra and Topsia produce high-strength wastewater with Total Chromium, sulphides, and biological oxygen demand that demands physico-chemical pre-treatment followed by biological polishing.
The West Bengal Pollution Control Board (WBPCB) enforces CPCB standards for all industrial effluent discharge, with additional norms for sensitive sectors and Ganga basin industries. Spans designs systems to meet or exceed WBPCB consent conditions — BOD <30 mg/L, COD <250 mg/L, TSS <100 mg/L — with technology selection driven by the actual effluent profile, not a one-size template.
Industry Challenges
Key Environmental Challenges
Tannery Wastewater Complexity
Kolkata's tannery clusters generate highly complex effluent: Total Chromium 50–500 mg/L, sulphide 50–200 mg/L, BOD 1,000–5,000 mg/L, and high TDS. Treatment requires chromium precipitation and recovery as a first step, followed by sulphide oxidation, primary physico-chemical treatment, and aerobic biological polishing — a multi-stage process that must be correctly sequenced to achieve WBPCB consent standards.
Haldia Petrochemical and Chemical Effluent
Haldia Industrial Complex hosts refineries, petrochemical plants, and fertiliser units generating oil-contaminated, high-TDS effluent with hydrocarbons and dissolved organics. Treatment requires API/CPI oil-water separators, dissolved air flotation, and multi-stage biological treatment before discharge — with ZLD increasingly mandated for water conservation in this industrial zone.
Jute and Textile Mill Effluent
Hooghly and Howrah district jute mills generate retting liquor and process water with BOD 500–3,000 mg/L, high suspended solids from fibre, and variable pH from retting chemicals. Textile dyeing effluent has high colour, COD 1,500–4,000 mg/L, and TDS from salt-heavy dyebath chemistry requiring coagulation-flocculation, colour removal, and biological treatment.
Monsoon and Flood Risk
Kolkata's flat terrain and high annual rainfall (1,600+ mm) create flood and stormwater ingress risk for ETPs located in low-lying industrial areas. Civil design must account for flood-proofing of control rooms, electrical panels, and biological treatment units, as well as stormwater separation to prevent hydraulic overloading during monsoon peaks.
Ganga Basin Compliance
Industries within the Ganga Action Plan (GAP) zone around Kolkata and the Hooghly river face heightened regulatory scrutiny from both WBPCB and the National Mission for Clean Ganga (NMCG). ETPs in this zone must maintain continuous online monitoring, CPCB-specified effluent parameters, and real-time data transmission to WBPCB's online portal.
Aging Industrial Infrastructure
Many of Kolkata's legacy manufacturing units operate with 20–30 year-old ETPs designed to outdated standards. Brownfield upgrades and retrofits are a significant requirement — requiring detailed plant audits, incremental upgrade planning, and often working within constrained footprints without disrupting ongoing production.
Our Solutions
Tailored Wastewater Treatment Solutions
Tannery ETP Systems
Complete multi-stage ETPs for tanneries: chrome-free segregation and chromium recovery (precipitation as Cr(OH)₃ sludge), sulphide oxidation using aeration or peroxide, primary physico-chemical treatment with coagulation-flocculation-DAF, aerobic biological treatment (MBBR or extended aeration), tertiary sand and carbon filtration, and treated effluent meeting WBPCB Total Chromium <2 mg/L and BOD <30 mg/L standards. Chrome sludge dewatered for recycling back to tannery as chrome tan liquor.
Food and Beverage ETP with DAF
ETPs for food processing, FMCG, and dairy manufacturers in Kolkata — handling high BOD/COD (500–8,000 mg/L), fats, oils, and greases from cooking and processing. DAF systems with polyelectrolyte dosing remove FOG upstream of MBBR or activated sludge biological treatment. Sized for 20–500 KLD capacity, designed for WBPCB-compliant discharge.
Pharma ETP and ZLD
Advanced ETPs for pharmaceutical and API manufacturers in Kalyani and Kolkata — treating complex organic effluent with APIs, solvents, and high COD (2,000–10,000 mg/L). Process design typically includes physico-chemical pre-treatment (pH adjustment, Fenton oxidation or activated carbon), aerobic biological treatment (MBR or MBBR), tertiary polishing, and ZLD with RO and MEE/MVR evaporation for water-stressed sites.
Brownfield ETP Audits and Upgrades
Techno-commercial assessments of existing ETPs — evaluating process performance against current consent conditions, identifying bottlenecks (hydraulic, organic, or equipment), and developing a prioritised upgrade roadmap with CAPEX and OPEX estimates. Brownfield upgrades executed without production disruption through phased approach.
Zero Liquid Discharge Systems
End-to-end ZLD systems for Kolkata's industrial clients facing WBPCB mandates or process water recovery requirements. Integration of MBR pre-treatment, RO, and thermal evaporation (MEE/MVR/ATFD) to recover >95% of effluent as reusable water. Particularly relevant for pharmaceutical, distillery, and textile clients facing increasing regulatory pressure.
O&M Services and AMC
Post-commissioning operations and maintenance support, operator training, and Annual Maintenance Contracts (AMC) covering preventive maintenance, performance audits, WBPCB compliance support, and emergency response. AMC clients receive quarterly performance reports with inlet/outlet analysis and regulatory compliance status.
Technologies
Proven Technologies for Your Industry
Benefits
Why Choose Spans for Your Industry
- 30+ years of ETP design and commissioning experience across India
- Specialist knowledge of tannery, textile, and food industry effluent profiles
- Full WBPCB compliance including online monitoring and real-time reporting
- Turnkey EPC — process design, equipment supply, civil coordination, commissioning
- ZLD-ready design with future upgrade potential built in from day one
- Brownfield upgrade capability for Kolkata's aging industrial ETP infrastructure
- Monsoon-resilient civil and electrical design for flood-prone industrial areas
- Operator training and AMC for reliable long-term performance
- Regional site visits and on-ground project management capability
Success Stories
Case Studies
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