Industrial STP & ETP Guide

By BIOPOWER (BPG Renewables) · Updated June 2026 · Sewage Treatment

An industrial STP/ETP treats wastewater and process effluent to meet pollution-control discharge norms before reuse or release. Selecting the right system depends on effluent characteristics, flow volume, and the discharge or reuse standard you must achieve.

What is the difference between STP and ETP?

An STP (Sewage Treatment Plant) treats domestic sewage, while an ETP (Effluent Treatment Plant) treats industrial process wastewater, which may contain chemicals, oils, or heavy metals requiring specialised treatment.

How do I choose an industrial treatment system?

Characterise the effluent (BOD, COD, TSS, pH, specific contaminants)
Define the discharge/reuse standard
Assess flow rate and variability
Select technology (ASP, SBR, MBBR, MBR) and tertiary polishing

Why is compliance important?

Pollution Control Board norms require industries to treat effluent before discharge. A well-designed STP/ETP ensures compliance, avoids penalties, and enables water reuse to cut fresh-water costs.

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Frequently Asked Questions

What is ZLD (Zero Liquid Discharge)?

ZLD is a treatment approach where all wastewater is recovered and reused, leaving no liquid discharge — often mandated for certain polluting industries.

Does BIOPOWER design industrial treatment plants?

Yes. BIOPOWER designs and installs STP and ETP systems sized to your effluent profile and compliance requirements.

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