Compact, reliable, and RERA-compliant STP solutions for residential apartments, housing complexes, and township projects. Get your OC on time with ZEXCORP's proven track record across Kolkata's fastest-growing neighborhoods.
Get a Builder's Quote →In Kolkata's booming real estate market — from New Town and Rajarhat to Salt Lake and South Kolkata — an STP is no longer optional. It directly impacts your OC timeline, RERA compliance, and project marketability.
KMDA, KMC, and municipal authorities require a functional, commissioned STP before issuing the Occupancy Certificate. Delays in STP installation directly translate to delayed possession, RERA penalties, and unhappy buyers. ZEXCORP delivers turnkey STPs aligned with your construction timeline.
Urban residential plots in Kolkata leave minimal space for utilities. Traditional STP designs consuming 200–300 sqft per KLD are impractical. ZEXCORP's compact MBBR and packaged STP systems achieve the same treatment in 60–80% less space, fitting into basements and utility corridors.
Residents living directly above or adjacent to the STP expect zero nuisance. Poorly designed systems generate complaints from day one. ZEXCORP designs enclosed, deodorized systems with acoustic covers on blowers, ensuring the STP is virtually invisible to residents.
Resident welfare associations inherit the STP operating burden. High electricity consumption, frequent chemical dosing, and specialist maintenance create ongoing conflicts. ZEXCORP designs low-opex systems with energy-efficient blowers, minimal chemical requirements, and simple operator-friendly controls.
Treated wastewater reuse for landscaping, toilet flushing, and car washing reduces common area water bills by 40–60%. This is a genuine selling point for eco-conscious buyers and mandatory for green building certifications like IGBC Gold and GRIHA.
Large township projects are developed in phases over 3–5 years. The STP must handle Phase 1 loads efficiently while being expandable for subsequent phases. ZEXCORP designs modular systems with built-in expansion provisions that avoid costly retrofitting.
Proven treatment technologies selected specifically for residential applications — compact, quiet, low-maintenance, and operator-friendly.
The most popular technology for residential STPs in Kolkata. Biofilm carriers provide high treatment efficiency in compact tanks. Handles load variations from occupancy fluctuations. Simple operation — no return sludge pumping. BOD removal >95% consistently.
Single-tank batch treatment ideal for medium and large complexes. Automatic PLC-controlled cycles handle fill, react, settle, and decant without operator intervention. Excellent effluent quality with BOD <10 mg/L. Flexible for variable flow patterns.
Factory-built, pre-commissioned STP units delivered ready to install. Ideal for smaller complexes (10–50 KLD) and projects with tight timelines. Minimal civil works required. Can be operational within 2–3 weeks of delivery.
Premium technology producing reuse-quality water directly. Eliminates secondary clarifier — 50% smaller footprint than MBBR. Effluent quality: BOD <5, TSS <2, bacteria-free. Best choice when treated water reuse is a priority or space is extremely limited.
Pressure sand filter, activated carbon filter, and UV disinfection for producing non-potable reuse water. Essential for projects targeting water reuse in toilet flushing and gardening. Meets CPHEEO reuse guidelines.
ZEXCORP's NEXUS IoT platform enables remote STP monitoring via smartphone app. RWA committee members can track performance parameters, receive alerts, and access compliance reports. Reduces dependence on specialized operators.
Typical performance from ZEXCORP residential STP installations across Kolkata's residential projects.
| Parameter | Raw Sewage | Treated Output | Discharge Standard | Removal |
|---|---|---|---|---|
| pH | 6.5 – 8.0 | 7.0 – 7.5 | 6.5 – 9.0 | — |
| BOD (mg/L) | 200 – 350 | < 10 | ≤ 30 | > 97% |
| COD (mg/L) | 400 – 700 | < 50 | ≤ 250 | > 92% |
| TSS (mg/L) | 200 – 350 | < 20 | ≤ 100 | > 94% |
| Oil & Grease (mg/L) | 20 – 50 | < 5 | ≤ 10 | > 90% |
| Fecal Coliform | 10⁶ – 10⁸ | < 230 MPN | ≤ 1,000 MPN | > 99.99% |
Kolkata's IT and residential hub seeing massive development. HIDCO mandates STP for all projects above 50 units. ZEXCORP serves multiple New Town projects with compact MBBR systems.
Premium residential area with strict KMDA environmental norms. Established neighborhoods require retrofit STPs for older complexes. Space-optimized designs essential.
Dense urban development in Jadavpur, Garia, Tollygunge, and Behala. Basement STP installations with zero-odor systems critical due to proximity to living spaces.
Emerging real estate corridor along Howrah, Durgapur Expressway, and Kolkata periphery. Large township projects need phased, expandable STP solutions.
From architectural consultation to OC handover — ZEXCORP partners with developers throughout the project lifecycle. Contact us for a builder-friendly quote aligned with your construction schedule.