1. Wastewater Sources, Typical Pollutants & Water Characteristics
CMP (Chemical Mechanical Planarization) slurry wastewater is a critical process wastewater generated during semiconductor wafer manufacturing. It primarily originates from chemical mechanical polishing (CMP), post-CMP wafer cleaning, spent slurry discharge, and cleanroom floor washing operations.
Compared with conventional industrial wastewater, CMP slurry wastewater exhibits highly specialized characteristics. The primary contaminants consist of nano-scale silica (SiO₂) and ceria (CeO₂) abrasive particles, together with trace metal ions such as copper (Cu) and aluminum (Al), polishing slurry dispersants, benzotriazole (BTA) corrosion inhibitors, and residual acids and alkalis.
The astewater is characterized by extremely high turbidity and exceptionally stable colloidal particles. Due to the ultra-fine particle size, suspended solids are difficult to settle and cannot be effectively separated using conventional treatment technologies.Although the overall COD is relatively low, the wastewater exhibits high viscosity, significant scaling potential, and frequent fluctuations in water quality, making pipeline blockage and membrane fouling common operational challenges.
Furthermore, semiconductor manufacturing requires ultrapure reclaimed water that meets extremely stringent process water specifications, with water quality requirements far exceeding those of conventional industrial wastewater reuse.
2. Common Customer Challenges
CMP wastewater treatment presents several highly specialized technical challenges unique to semiconductor manufacturing.
Stable nano-scale silica colloids are difficult to remove using conventional sedimentation processes, resulting in sludge accumulation, severe membrane fouling, frequent membrane replacement, and unplanned system shutdowns that directly affect wafer production continuity.
Residual polishing chemicals and trace heavy metals may lead to environmental compliance risks if not completely removed.
Since semiconductor fabrication facilities require exceptionally high-purity reclaimed water, conventional water treatment systems are often unable to consistently achieve the required water quality, resulting in low water reuse rates and increased operating costs.
Standardized wastewater treatment equipment is generally not designed for the high-viscosity, ultra-fine particle characteristics of CMP slurry wastewater, offering insufficient anti-clogging and corrosion resistance.
In addition, semiconductor fabs frequently expand production capacity, while conventional treatment systems occupy large footprints and provide limited flexibility for capacity upgrades. As a result, integrated and customized wastewater treatment solutions specifically designed for advanced semiconductor manufacturing are increasingly required.
3. Treatment Process & Core Equipment Configuration
To address the primary challenges of CMP wastewater—including stable colloids, ultra-fine particles, and membrane fouling—we utilize a dedicated treatment process consisting of:
Segregated Collection → Precision Water Conditioning & Coagulation → High-Efficiency Flocculation & Sedimentation → Precision Filtration → Advanced Membrane Purification → Ultrapure Water Reuse
CMP wastewater is collected separately and equalized to maintain stable treatment conditions.
Accurate pH adjustment destabilizes colloidal particles, while a high-performance coagulation and flocculation system rapidly aggregates and settles nano-scale abrasive particles.
Following sedimentation, the majority of suspended solids and colloidal contaminants are removed before the water passes through precision filtration and activated carbon adsorption, eliminating residual organic compounds and trace metal impurities.
Finally, an Ultrafiltration (UF) system combined with an anti-fouling Reverse Osmosis (RO) membrane system provides advanced desalination and purification, producing high-quality reclaimed water suitable for wafer polishing and cleaning processes.
Core equipment includes:
- Intelligent pH adjustment and chemical conditioning systems
- High-efficiency coagulation and flocculation reactors
- Precision filtration units
- Anti-fouling membrane filtration systems
- Activated carbon purification systems
- Fully automatic chemical dosing systems
- High-precision online water quality monitoring systems
4. Solution Advantages
This solution is specifically engineered for semiconductor CMP slurry wastewater, effectively overcoming the industry’s most challenging issues, including difficult colloidal separation and severe membrane fouling.
The proprietary treatment process efficiently removes ultra-fine silica particles, trace heavy metals, and residual organic contaminants while consistently producing reclaimed water that meets semiconductor process water reuse standards.
We offer fully customized equipment solutions tailored to semiconductor cleanroom environments, plant layout, and wastewater characteristics. Customized anti-clog flow channels, corrosion-resistant equipment housings, and precision filtration structures ensure optimal performance under demanding CMP wastewater operating conditions.
All core electrical control systems, mechanical equipment, and water treatment components are certified to CE, UL, and ISO standards, complying with international safety requirements for advanced manufacturing facilities in Europe and North America.
The system demonstrates excellent resistance to hydraulic and water quality fluctuations, significantly reducing membrane fouling, maintenance frequency, and equipment downtime.
Water recovery rates exceed 95%, substantially reducing freshwater consumption and operating costs.
Its modular integrated design minimizes installation space while allowing flexible future expansion. Fully automated intelligent operation supports the continuous, high-precision production requirements of modern semiconductor wafer fabrication facilities.
5. Project References & Supporting Documentation
We have successfully completed multiple CMP slurry wastewater treatment projects for semiconductor wafer fabrication plants.
A representative project is a 12-inch Semiconductor Wafer Fab CMP Wastewater Recycling Project, with a treatment capacity of 1,000 m³/day.
The system has demonstrated long-term stable operation, completely resolving issues related to colloidal accumulation, membrane fouling, and unstable effluent quality. The reclaimed water consistently meets semiconductor ultrapure water reuse standards and has successfully passed both environmental compliance inspections and factory acceptance testing.
Supporting documentation includes:
- Proprietary CMP wastewater treatment process patents
- CE, UL, and ISO certification certificates
- Third-party high-precision water quality testing reports
- Project completion and acceptance documentation
- Reference projects within the semiconductor industry
6. Service Scope & Cooperation Process
We provide comprehensive EPC turnkey solutions for CMP slurry wastewater treatment, covering site investigation, wastewater sampling and analysis, customized process engineering, non-standard equipment design, equipment manufacturing, installation, commissioning, operation and maintenance, system upgrades, and lifetime consumables supply.
Standard Cooperation Process
- Site Survey & Water Sampling – Conduct on-site investigation, collect wastewater samples, and issue a comprehensive water quality analysis report.
- Customized Engineering Design – Develop a dedicated treatment process, customized equipment solution, and commercial proposal based on actual fab operating conditions.
- Equipment Manufacturing & Construction – Begin customized equipment fabrication and on-site construction after contract confirmation.
- Installation & Commissioning – Complete installation, integrated commissioning, and trial operation until stable compliance with water quality requirements is achieved.
- Project Acceptance & Training – Assist with project acceptance procedures and provide professional operator training.
- Long-term Technical Support – Deliver routine inspections, preventive maintenance, system optimization, equipment upgrades, and 24/7 technical support.
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