ZEXCORP is Kolkata's trusted partner for effluent treatment plant design, fabrication, installation, and operations. From breweries to textile mills, we engineer ETP systems that consistently meet WBPCB and CPCB discharge standards — backed by real industrial experience and 24/7 operational support.
Most ETP companies in Kolkata sell equipment. We engineer complete solutions — from wastewater characterization to commissioning and long-term operations. Here is what sets us apart.
We operate ETPs in live brewery, manufacturing, and food processing environments — not just build them. Our designs come from hands-on operational knowledge across dozens of industrial sectors in West Bengal.
Every ETP we design targets discharge parameters well within WBPCB/CPCB norms. We handle CTE/CTO applications, consent renewals, OCEMS coordination, and regulatory audits so you stay compliant year-round.
We work with MBBR, SBR, MBR, DAF, UASB, and conventional ASP systems. Technology selection is driven by your wastewater profile, not by what is cheapest to install. Every design is backed by detailed engineering calculations.
Our ETP installations can integrate real-time IoT sensors for pH, DO, flow, turbidity, and OCEMS compliance. Remote dashboards give you live visibility into plant performance from anywhere — powered by our ZEXCORP ERI platform.
We do not disappear after commissioning. Our O&M teams run your ETP on daily, weekly, monthly, and quarterly cycles. Annual Maintenance Contracts (AMC) with guaranteed SLA response times keep your plant at peak performance.
Existing ETP underperforming? We audit, diagnose, and retrofit — adding MBBR media, upgrading aeration, installing DAF, or bolting on tertiary treatment (UF/RO) — often achieving 40-60% performance improvement without major civil work.
Each industry produces unique effluent. We design ETPs specifically for your wastewater characteristics, flow patterns, and regulatory requirements — not generic cookie-cutter systems.
High BOD (2000-4000 mg/L), acidic pH, seasonal load variation. UASB + MBBR systems.
High color, TDS, pH swings. DAF + chemical treatment + MBR for ZLD compliance.
Complex organics, solvents, high COD. Advanced oxidation + biological treatment.
High BOD/COD, FOG, nutrients. Screening + DAF + MBBR + tertiary polishing.
Heavy metals, acids/alkalis, toxic compounds. Neutralization + precipitation + biological.
Chromium, nickel, zinc, cyanide. Chemical reduction + precipitation + sludge handling.
High SAR, chromium, BOD. Chrome recovery + biological treatment + tertiary filtration.
High TSS, BOD, color, lignin. Primary clarification + MBBR + fiber recovery.
We select the optimal technology combination based on your wastewater characterization, land constraints, operational costs, and regulatory targets — not vendor preferences.
Compact, high-efficiency biological treatment using biofilm carriers. Handles load fluctuations well. Ideal for brewery, food processing, and pharmaceutical effluents. BOD removal >95% in optimized configurations. Our most recommended technology for mid-range ETPs in Kolkata.
Batch-mode activated sludge system with fill, react, settle, and decant phases in a single tank. Excellent nutrient removal (nitrogen, phosphorus). Compact footprint, ideal for sites with limited land. Suitable for 10-500 KLD ETPs.
Combines biological treatment with UF/MF membrane separation. Produces near-RO quality treated water suitable for reuse. Higher CAPEX but lowest footprint. Essential for ZLD systems and water recycling applications.
Anaerobic treatment for high-strength organic effluents (COD >3000 mg/L). Generates biogas for energy recovery. Commonly used as the first biological stage in brewery and distillery ETPs, reducing BOD by 70-80% before aerobic polishing.
Conventional aerobic treatment with aeration tank and secondary clarifier. Well-understood, reliable for municipal-type effluents. Extended aeration variants suit smaller installations. We design both conventional and extended aeration ASP systems.
High-rate biofilm system with fluidized media for treating refractory organics. Excellent for pharmaceutical and chemical industry effluents with low biodegradability (BOD/COD ratio <0.3).
Removes suspended solids, oils, grease, and fats using micro-bubble flotation. Essential pre-treatment for food processing, textile, and oily effluents. Achieves TSS removal >95% and FOG removal >99%.
Uses coagulants (PAC, ferric chloride) and flocculants (polyelectrolytes) to aggregate and settle suspended and colloidal matter. Primary treatment stage for most industrial ETPs. Handles heavy metals, color, and turbidity.
Polishing stage to achieve stringent discharge standards or water reuse quality. Pressure sand filter + activated carbon filter for general polishing. UF and RO for water recycling and ZLD applications.
Filter press, belt press, and centrifuge-based dewatering. Sludge drying beds for smaller plants. We design complete sludge management systems including thickeners, conditioning, dewatering, and TSDF coordination.
From the first site visit to long-term operations, ZEXCORP handles every phase of your effluent treatment plant lifecycle.
We collect and analyze your effluent samples for BOD, COD, TSS, TDS, pH, heavy metals, oil and grease, and industry-specific parameters. This data drives the entire ETP design — we never design without lab data. Includes flow measurement, load profiling, and treatability studies.
Process flow diagrams (PFD), piping and instrumentation diagrams (P&ID), civil/structural drawings, equipment specifications, BOQ with material take-offs, and detailed project reports (DPR). Designs follow IS codes, CPHEEO manual guidelines, and CPCB/WBPCB standards. Every design is reviewed by our senior process engineers.
MS/SS tank fabrication, MBBR media supply, blower and pump procurement, chemical dosing systems, instrumentation panels, and SCADA integration. We source from vetted OEMs and manage quality control through factory acceptance tests (FAT).
Civil construction supervision, mechanical erection, piping, electrical wiring, instrumentation, and wet commissioning with seed sludge and bio-culture. We handle the entire project from foundation to first treated water sample, including trial runs and performance guarantee testing.
Full-time or part-time plant operators, daily monitoring logs, chemical dosing optimization, equipment maintenance schedules, and monthly performance reports. Our O&M contracts include 24/7 emergency response and guaranteed treated water quality. Read our ETP maintenance checklist guide.
Preventive maintenance with scheduled visits (weekly/fortnightly/monthly), consumable supply (chemicals, media), equipment overhaul, performance auditing, and compliance documentation. AMC rates from ₹8,000/month for small ETPs to ₹1,50,000+/month for large installations.
Is your existing ETP underperforming or failing WBPCB inspections? We conduct a process audit, identify bottlenecks, and retrofit with targeted upgrades — MBBR media addition, aeration system overhaul, DAF installation, tertiary treatment bolt-on, or SCADA/IoT integration. Often 40-60% performance improvement at 30-40% of new ETP cost.
CTE (Consent to Establish) and CTO (Consent to Operate) applications, consent renewals, environmental audit reports, hazardous waste authorization, OCEMS installation and calibration, and representation during WBPCB inspections. We handle the entire regulatory lifecycle. See our complete WBPCB compliance guide.
These are representative inlet and outlet values we design for. Actual parameters vary by process, production volume, and specific regulatory requirements. ZEXCORP conducts detailed lab analysis before finalizing design parameters.
| Parameter | Brewery Inlet | Textile Inlet | Pharma Inlet | Food Proc. Inlet | WBPCB Outlet Limit |
|---|---|---|---|---|---|
| pH | 4.0 – 7.0 | 8.0 – 12.0 | 3.0 – 11.0 | 5.0 – 8.0 | 5.5 – 9.0 |
| BOD (mg/L) | 2,000 – 4,000 | 150 – 500 | 500 – 2,000 | 1,500 – 3,500 | ≤ 30 |
| COD (mg/L) | 3,500 – 7,000 | 400 – 1,500 | 1,000 – 5,000 | 2,500 – 6,000 | ≤ 250 |
| TSS (mg/L) | 500 – 1,500 | 100 – 400 | 200 – 800 | 300 – 1,200 | ≤ 100 |
| TDS (mg/L) | 1,000 – 3,000 | 3,000 – 15,000 | 2,000 – 8,000 | 800 – 2,500 | ≤ 2,100 |
| Oil & Grease (mg/L) | 50 – 200 | 10 – 50 | 5 – 30 | 100 – 500 | ≤ 10 |
| Color (Pt-Co) | 200 – 500 | 500 – 3,000 | 100 – 400 | 100 – 300 | Colorless |
Source: CPCB General Standards for Discharge of Environmental Pollutants (Schedule VI). Industry-specific standards may be stricter. For detailed BOD/COD calculation guidance, see our technical blog.
ZEXCORP provides ETP design, installation, and maintenance services across Kolkata and all major industrial areas of West Bengal.
Common questions from industrial clients about effluent treatment plant design, costs, compliance, and maintenance in Kolkata and West Bengal.
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