Wastewater Treatment
Wastewater Treatment Simple Enough to Brief, Technical Enough to Trust
Sewage treatment plants for buildings, effluent treatment plants for factories, and recycling systems that turn wastewater into a reusable resource — engineered by Neptune for compliance and long-term reliability.
The problem
Compliance is rising faster than most plants are ready for
Government programmes like Jal Jeevan Mission and AMRUT 2.0, alongside CPCB and state pollution control board norms, are steadily pushing wastewater compliance up the priority list for buildings and industry alike. Plants sized without this in mind fall behind fast.
Non-compliant discharge
Untreated or under-treated wastewater risks penalties and disrupted occupancy or operating certificates.
Wasted reuse potential
Treated water that could offset flushing, gardening or process demand instead goes straight to drain.
Industry-specific effluent
Generic STP-style systems can't handle the chemical load in many industrial effluent streams.
An STP (Sewage Treatment Plant) treats domestic wastewater — sewage from toilets, kitchens and washing — for safe discharge or reuse in flushing and gardening. An ETP (Effluent Treatment Plant) treats industrial effluent carrying process-specific chemicals or pollutants, engineered to meet the discharge norms for that specific industry. Most buildings need an STP; most factories need an ETP, and some sites need both.
Sewage Treatment Plant (STP)
Domestic wastewater, treated for reuse
STP systems treat sewage from residential and commercial buildings through biological and physical stages, producing output suitable for discharge or on-site reuse.
- Sized to occupancy & peak sewage flow
- Compact designs for space-constrained sites
- Treated output reusable for flushing & gardening
Raw Sewage
Building inflow
Biological Treatment
Aeration stage
Clarification
Settling & filtration
Reuse / Discharge
Flushing, gardening
Industrial Effluent
Process wastewater
Chemical/Physical Treatment
Contaminant-specific
Biological Polishing
Where required
Compliant Discharge
Norm-matched output
Effluent Treatment Plant (ETP)
Industrial effluent, treated to your norms
ETP systems are engineered around the specific chemical and physical characteristics of your industrial effluent stream, not a generic sewage-treatment template.
- Treatment stages matched to effluent characteristics
- Designed toward applicable CPCB/state discharge norms
- Sludge & residual handling built into design
Water Recycling
Turn treated wastewater into a resource
Recycling systems polish STP or ETP output further, enabling reuse for flushing, gardening, cooling-tower make-up or select process applications — cutting fresh water demand and disposal cost.
- Tertiary filtration & polishing stages
- Reduces fresh water intake for non-potable uses
- Supports green-building & water-positive goals
STP/ETP Output
Treated water
Tertiary Polishing
Filtration stage
Reused Water
Flushing, cooling, irrigation
Process Effluent
Factory-specific
Engineered Treatment
Datasheet-backed
Compliant Output
Discharge or reuse
Industrial Wastewater
Process-specific wastewater, engineered end to end
For manufacturing and process industries, Neptune works from your effluent's actual chemical load and volume to design treatment that supports compliance and, where feasible, water reuse.
- Sized from actual effluent volume & composition
- Datasheets ready for consultant/regulator sign-off
- AMC support for ongoing compliance operation
Transfer, dosing and recirculation pumping on our STP/ETP systems is sized and backed by our Wilo authorized partnership. See the partnership Certifications confirmed on request
Indicative specifications
Typical capacity ranges by plant type
| Plant type | Typical capacity range | Primary function |
|---|---|---|
| Sewage treatment plant (STP) | 5 – 500+ KLD | Domestic wastewater treatment |
| Effluent treatment plant (ETP) | 5 – 1000+ KLD | Industrial effluent treatment |
| Water recycling / tertiary system | Sized to STP/ETP output | Reuse-grade polishing |
Figures are indicative starting ranges for planning only — final sizing is confirmed against your occupancy, effluent characteristics and applicable compliance norms.
Why Neptune
Benefits of wastewater systems sized for compliance
Compliance-ready design
Systems engineered toward applicable CPCB and state discharge norms from day one.
Reuse-ready output
Treatment trains designed with downstream reuse in mind, not just disposal.
Right-sized capacity
Capacity matched to real occupancy or effluent volume — not padded "to be safe."
One accountable partner
Design, install and AMC for your STP, ETP or recycling system from a single team.
FAQs
Wastewater treatment — common questions
What is the difference between STP and ETP?+
Is STP mandatory for my building?+
Can treated wastewater be reused?+
Do you handle industrial effluent compliance requirements?+
Request a quote
Get a wastewater treatment recommendation
Start with three details — we'll follow up with the right questions for your site.
Not sure whether you need STP, ETP or both?
Use the Product Finder to get matched to the right solution in under a minute.