STP and ETP Plant Manufacturer in Kolkata

Industrial wastewater from leather tanning, chemical processing, food products, pharmaceutical manufacturing, and garment dyeing in Bantala Leather Complex (Calcutta Leather Complex), Kasba Industrial Estate, Taratala, and Cossipore carries severe chemical complexity that standard biological plants cannot break down. Effluent streams contain chromium-bearing tannery waste, high sulfides, extreme biological and chemical oxygen demand, solvent residues, and municipal sewage, which rapidly foul biological media and cause severe equipment wear if not properly pre-treated. Overcoming these challenges requires multi-stage physico-chemical and mechanical treatment.

Trity Environ Solutions manufactures primary treatment systems featuring automated bar screens, grit removal, and mechanical oil skimmers to capture free and emulsified oils. The wastewater flows into flash mixing and flocculation chambers where automated dosing pumps introduce coagulants, polyelectrolytes, and pH-correcting reagents. Our lamella clarifiers and vertical tube settlers ensure rapid solids separation within a compact structural footprint.

Settled sludge is processed through recessed plate membrane filter presses, creating dry cake for authorized hazardous waste management. For facilities handling refractory COD, toxic solvents, or heavy metals, we integrate chemical oxidation, Fenton reactors, and activated carbon polishing columns to ensure full discharge compliance.

Rapid urban growth across New Town Rajarhat, Salt Lake Sector V, EM Bypass corridor, and South Kolkata townships demands dependable, decentralized sewage treatment. Hospitals, hotels, educational campuses, and residential townships face strict regulatory pressure from the WBPCB and municipal authorities to ensure zero untreated sewage enters stormwater channels or the Hooghly River & East Kolkata Wetlands.

Traditional sewage treatment plants suffer from large civil footprints, high power consumption, and persistent odor emissions. Trity Environ Solutions designs prefabricated packaged sewage treatment plants based on Moving Bed Biofilm Reactor (MBBR) and Membrane Bioreactor (MBR) technologies.

In our MBBR plants, virgin polypropylene media remain in suspension via fine bubble diffusers, creating resilient biomass capable of handling sharp load fluctuations.

For facilities requiring the highest effluent clarity and minimal footprint, our MBR plants combine biological digestion with submerged 0.04-micron membrane filtration. The permeate is crystal clear, odorless, and pathogen-free, immediately reusable in central HVAC cooling towers, toilet flushing, and greenbelt irrigation. Every plant is supported by an Annual Maintenance Contract. Consult our engineering team to evaluate your project needs.

The Hooghly River & East Kolkata Wetlands is an essential water source under intensive ecological scrutiny in West Bengal. Due to extensive industrial discharge, National Mission for Clean Ganga (NMCG) and NGT directives mandating zero untreated sewage and industrial discharge into the Hooghly. Regulatory agencies are increasingly making Zero Liquid Discharge (ZLD) systems mandatory for water-intensive industries across the region.

Operating a ZLD plant requires thermal and electrical optimization to keep running costs manageable. Trity Environ Solutions engineers energy-efficient closed-loop ZLD systems. Following primary physico-chemical and secondary biological treatment, effluent passes through chemical softening and silica removal before entering multi-stage brackish water reverse osmosis (RO) systems. This membrane phase recovers 85 to 90 percent of clear water for direct return to factory processes.

The concentrated brine stream is processed through high-pressure disc-tube reverse osmosis (DTRO) and thermal Multi-Effect Evaporators (MEE) or Mechanical Vapor Recompression (MVR) systems paired with Agitated Thin Film Dryers (ATFD). Solid salts crystallize into dry cake for safe disposal, leaving zero liquid outflow. This closed loop protects your unit against groundwater extraction limits and ensures uninterrupted manufacturing.