UPW System and Wastewater Recycling in Semiconductor Plants

Semiconductor manufacturing requires water at very different quality levels. Ultrapure water (UPW) is used for wafer cleaning, rinsing, etching, and other critical processes, while the same production lines generate wastewater containing chemicals, dissolved solids, and other process contaminants.

For semiconductor plants, the challenge is therefore not simply to produce UPW or treat wastewater separately. A reliable Semiconductor Wastewater Treatment System needs to consider both sides of the water cycle: stable process-water supply and effective wastewater recovery.

Why UPW and Wastewater Treatment Need to Work Together

UPW systems require carefully controlled feedwater quality. Depending on the manufacturing process and required water quality, treatment may include pretreatment, membrane separation, reverse osmosis, and polishing technologies.

Wastewater, however, can vary considerably between different production steps. Acidic and alkaline streams, fluoride-containing wastewater, suspended solids, and dissolved contaminants may require different treatment approaches.

This is why semiconductor facilities often benefit from wastewater stream segregation and a treatment system designed around the actual process conditions rather than a standard package.

Water Recycling Can Reduce Freshwater Demand

After appropriate pretreatment, membrane processes such as ultrafiltration (UF) and reverse osmosis (RO) can be used to recover water for suitable industrial reuse applications.

The objective is not always to achieve the highest possible recovery rate. From an engineering perspective, a stable recovery rate is often more valuable than pushing the system beyond its reliable operating range. Feedwater quality, membrane fouling, scaling potential, concentrate management, and downstream reuse requirements all need to be considered.

For plants with higher water-reuse targets, membrane treatment can also be integrated with additional concentration or thermal processes.

Engineering Experience from Semiconductor Projects

ERAGON's semiconductor water-treatment references cover both UPW production and industrial wastewater treatment.

In a semiconductor manufacturing project, the complete treatment system was installed in the basement of the facility. The project included an UPW preparation system with a specified resistivity of ≥18.2 MΩ·cm, while the wastewater treatment system was designed for 600 m³/day.

Another project for a precision semiconductor component manufacturer included water reuse, pure water, and UPW systems, with a specified pure-water resistivity of ≥10 MΩ·cm and an international EW-1 requirement.

These projects demonstrate an important point: semiconductor water treatment is not a single-technology application. System configuration must be matched to production processes, water-quality requirements, available space, wastewater characteristics, and long-term operating conditions.

For a closer look at ERAGON's semiconductor project experience, see our Semiconductor UPW & Wastewater Treatment project.

For membrane-based treatment and water reuse, you can also explore our Industrial RO Membranes.

Planning a Semiconductor Water Treatment System

Before selecting an UPW System or Semiconductor Wastewater Treatment process, manufacturers should evaluate:

• Raw water and wastewater quality
• Required UPW resistivity and water-quality specifications
• Wastewater segregation requirements
• Water reuse targets
• Membrane fouling and scaling risks
• Concentrate management
• Available installation space
• Long-term operation and maintenance requirements

A well-designed system should support production reliability while reducing freshwater consumption and wastewater discharge.

ERAGON ENVIRO TECH provides engineered UPW Systems, Semiconductor Wastewater Treatment, and Industrial Water Reuse solutions, covering process design, equipment manufacturing, EPC delivery, commissioning, and operational support. Our current portfolio includes more than 200 projects and 20+ years of industry experience.

FAQ

Q1: What is UPW used for in semiconductor manufacturing?

UPW is commonly used for wafer cleaning, rinsing, etching, and other processes where high water purity is required.

Q2: Can semiconductor wastewater be recycled?

Yes. Depending on wastewater characteristics and the intended reuse point, treatment may combine pretreatment, UF, RO, and other polishing or concentration technologies.

Q3: What should be considered when designing semiconductor wastewater treatment?

Wastewater composition, stream segregation, water-quality targets, recovery requirements, membrane fouling, concentrate management, space, and long-term operation should all be evaluated before selecting the process.