What is the difference between an STP and an ETP?

An STP treats domestic sewage generated from toilets, washrooms, kitchens, and sanitation facilities. An ETP treats industrial process wastewater that may contain chemicals, heavy metals, dyes, solvents, and other manufacturing-related contaminants.

Do factories need both an STP and an ETP?

In most cases, yes. Manufacturing facilities generate domestic sewage from employee facilities and industrial effluent from production processes. These wastewater streams typically require separate treatment systems.

What is a WTP used for?

A Water Treatment Plant (WTP) treats incoming raw water from borewells, municipal supplies, rivers, or other sources to meet quality requirements for industrial processes, boiler feed, cooling systems, or drinking water applications.

Can an STP treat industrial wastewater?

Generally, no. Industrial wastewater often contains chemicals, heavy metals, and complex contaminants that can disrupt biological treatment processes in an STP. Industrial effluent requires a properly designed ETP suited to the specific wastewater characteristics.

How do I determine which treatment system my facility needs?

The decision depends on the type of water generated and used at the facility. Domestic sewage requires an STP, industrial process wastewater requires an ETP, and raw source water requiring purification requires a WTP. Many industrial facilities operate all three systems to meet operational and regulatory requirements.

STP vs ETP vs WTP: What's the Difference?