ETP STP ZLD Turnkey Solutions

Effluent Treatment Plants (ETP), Sewage Treatment Plants (STP) and Zero Liquid Discharge (ZLD) systems are no longer optional infrastructure for industrial, hospitality and real-estate projects. Under the Water (Prevention and Control of Pollution) Act, the Environment Protection Act and the state-level norms notified by every State Pollution Control Board, any facility that generates industrial effluent or sewage above the threshold must operate an approved treatment system before its Consent to Operate (CTO) is granted.

The Exim Roof delivers ETP, STP and ZLD systems on a fully turnkey Design–Build–Operate model. We size the plant to your actual load, engineer the process train, procure and install equipment, commission the plant against SPCB norms, and — if you prefer to focus on your core business — take over operation and maintenance under a long-term contract. Whether you are a food-processing MSME needing a 50 KLD ETP or a chemical park needing a multi-stage ZLD, our engineers deliver a defensible design at commercially sensible capex.

ETP — Effluent Treatment Plant

An ETP is designed to treat industrial wastewater generated during manufacturing so that the treated water meets the discharge standards prescribed by the local Pollution Control Board — CPCB / SPCB / PCC. The specific process train (primary, secondary, tertiary; biological, chemical, membrane) depends on the pollutant load, the industry category and the reuse / disposal destination of the treated stream.

• Primary treatment — screening, equalisation, oil-and-grease removal, neutralisation, coagulation and flocculation.
• Secondary treatment — biological processes such as activated sludge, MBBR, SBR, MBR and anaerobic digestion tailored to organic-load characteristics.
• Tertiary treatment — sand and carbon filters, membrane filtration, disinfection (UV / chlorination) and polishing.
• Sludge handling — thickeners, filter presses and safe disposal in line with hazardous-waste rules.

STP — Sewage Treatment Plant

An STP treats domestic sewage from hotels, hospitals, residential and commercial complexes so that treated water can be safely reused for flushing, gardening and cooling towers, and residual discharge meets local norms. Modern STPs use compact technologies such as MBBR, MBR and SBR that occupy 30–40% less footprint than conventional ASP systems and require significantly less operator intervention.

For real-estate projects and hospitality clients, a well-sized STP with a proper reuse plan can cut freshwater consumption by 40–60% and materially reduce municipal water bills — the payback is often less than four years, entirely apart from the environmental compliance angle.

ZLD — Zero Liquid Discharge

ZLD is the gold standard where no treated effluent is discharged out of the plant boundary. All water is recovered and reused; the remaining pollutants are concentrated into a solid stream for safe disposal. ZLD is now mandatory for water-intensive polluting sectors such as textile dyeing, tannery, pulp and paper, distilleries and chemical clusters in most Indian states.

A robust ZLD system typically combines pre-treatment (chemical or biological), membrane concentration (RO / NF), thermal concentration (MEE — multiple-effect evaporators, MVR — mechanical vapour recompression) and final crystallisation. Our team engineers each stage to minimise operating cost — since ZLD systems are unforgivingly opex-heavy if designed thoughtlessly.

Our turnkey delivery model

• Site survey, characterisation and effluent-load study — verified against your actual generation, not thumb rules.
• Detailed engineering — process flow, hydraulics, mass balance, PFD / P&ID, civil, mechanical and electrical drawings.
• SPCB liaison — CTE application, drawing approval, technology memo and compliance certificate.
• Procurement, fabrication and installation — with vetted equipment vendors and third-party inspection.
• Commissioning and performance guarantee testing against agreed KPIs.
• Operation & maintenance — 24×7 on-site operators, chemicals, membranes and sludge disposal on AMC.
• Digital SCADA integration for real-time monitoring and CPCB OCEMS reporting.

Why work with The Exim Roof

Effluent-treatment procurement is a market where sub-standard plants are sold every day and end up as dead assets after a CTO inspection. Our engineers spend two weeks on a proper effluent characterisation before proposing any technology, refuse to use unrealistic thumb rules, and stand behind guaranteed performance clauses. Every ETP / STP / ZLD we build is delivered with SPCB-approved drawings, third-party performance test reports and a clean handover binder.