High-purity water purification

I. User Pain Points

Electronic component manufacturers (printed circuit boards, surface mount technology, connectors, semiconductor packaging) face three core challenges in the high-purity water preparation, cleaning wastewater reuse, and process water purification processes: "total organic carbon/ion residue, microbial contamination, and water quality fluctuations." These challenges directly threaten component yield, product reliability, and production costs.

Excessive Total Organic Carbon/Ion Residue, Degrading Component Performance: High-purity water used in printed circuit board manufacturing contains contaminants such as total organic carbon, chloride ions, and sodium ions. Traditional reverse osmosis + mixed bed processes achieve a total organic carbon removal rate of less than 60%, resulting in effluent indicators exceeding relevant standards of the International Electrotechnical Commission (IEC). For example, a high-end printed circuit board factory, a client of Shanxi Xinhua Shengtan, suffered batch scrap losses exceeding 800,000 yuan due to excessive total organic carbon, leading to corrosion of the inner circuitry.

Microbial contamination, biofilm blockage, and product contamination: High-purity water systems are prone to bacterial and endotoxin growth. Traditional ultraviolet sterilization can only inactivate 70% of bacteria, leaving residual microorganisms to form biofilms in the pipes, leading to decreased resistivity and increased particulate matter. A surface mount technology factory, a client of Shanxi Xinhua Shengtan, experienced solder joint defects due to bacterial contamination, resulting in a significant increase in customer returns.

Water quality fluctuations and poor process stability: Raw water hardness and organic matter content fluctuate seasonally. Traditional pretreatment processes have poor adaptability, leading to large fluctuations in effluent resistivity, affecting electroplating and etching precision. A connector factory, a client of Shanxi Xinhua Shengtan, experienced uneven electroplating thickness due to water quality fluctuations, resulting in a significantly increased product defect rate.

II. Application Objectives

Electronic component manufacturers adopt activated carbon for four core objectives, focusing on "deep removal of total organic carbon/ions, microbial control, water quality stability, and yield assurance":
Deep Removal of Total Organic Carbon/Ions: Ensuring Component Reliability
Through the adsorption of total organic carbon and chloride ions by mesoporous activated carbon, combined with surface modification to enhance ion exchange, the effluent indicators surpass the standards of the International Electrotechnical Commission (IEC). After use by a high-end printed circuit board factory, a client of Shanxi Xinhua Shengtan, the corrosion problem of inner layer circuits was completely eliminated.
Microbial Control: Eliminating Biofilm
Using silver-loaded activated carbon, efficient sterilization is achieved through the slow release of silver ions. Combined with the macroporous structure to trap microbial remains, the content of bacteria and endotoxins in the effluent is significantly reduced. After use by a surface mount technology factory, a client of Shanxi Xinhua Shengtan, the rate of solder joint defects significantly decreased.
Water Quality Stability: Improving Process Stability
Utilizing anti-fouling activated carbon, its hydrophilic-hydrophobic adaptive properties resist fluctuations in the organic matter in the raw water, maintaining a highly stable effluent resistivity. After use by a connector factory, a client of Shanxi Xinhua Shengtan, the uniformity of electroplating layer thickness was significantly improved.

Strict Compliance, Meeting Global Electronic Standards

Meets global standards for electronic component manufacturing:

• Total organic carbon and chloride ion content meet standards;
• Resistivity meets printed circuit board plating requirements;
• Bacterial count meets semiconductor industry water quality standards.

III. Application Significance

The application of activated carbon in high-purity water purification for electronic component manufacturers is a core support for "component yield baseline + product reliability + cost control":

• Component yield baseline: Many printed circuit board and surface mount technology companies suffer batch scrap due to water quality issues. Activated carbon can simultaneously remove multiple contaminants at a lower operating cost, effectively avoiding significant losses.
• Product reliability assurance: Controlling bacteria and endotoxins to extremely low levels eliminates problems such as poor solder joints and corrosion, significantly reducing return losses.
• Improved process stability: Minimal resistivity fluctuations improve plating and etching precision, resulting in a substantial decrease in product defect rates.

IV. Application History

The application of activated carbon in high-purity water purification for electronic components has deepened alongside the miniaturization of electronic components and the upgrading of water quality standards:

1990s: Initial Stage Murata Manufacturing Co., Ltd. of Japan first used granular activated carbon to treat high-purity water used for cleaning multilayer ceramic capacitors, effectively reducing the total organic carbon content.

2010s: Promotion Stage The International Electrotechnical Commission (IEC) strengthened pollutant limits in relevant standards, promoting the widespread adoption of mesoporous activated carbon combined with mixed-bed processes. In 2016, Shennan Circuits, a partner of Shanxi Xinhua Shengtan, used mesoporous activated carbon to ensure that the high-purity water for printed circuit boards met standards and passed certification.

V. Mechanism of Action Activated carbon solves the problems of residual pollution, microorganisms, and water quality fluctuations in high-purity water for electronic components through a triple action of "mesoporous adsorption of total organic carbon/ions + silver-loaded sterilization + amphoteric ion anti-fouling": Mesoporous adsorption of total organic carbon/ions: The mesopores adsorb total organic carbon molecules through size sieving, while surface-modified functional groups adsorb chloride and sodium ions through ion exchange, achieving deep purification.

Silver-loaded bactericidal action: Continuous and slow release of silver ions disrupts bacterial cell membrane structure, while the macroporous structure traps dead microorganisms, preventing secondary pollution.

Amphoteric anti-fouling action: Amphoteric groups, through their hydrophilic-hydrophobic adaptive properties, resist fluctuations in raw water organic matter, stabilizing the system's effluent quality.

VI. Application Methods

Electronic component manufacturers utilize a combined process of "deep removal of total organic carbon/ions + microbial control + water quality stabilization":

1. Deep removal of total organic carbon/ions: Mesoporous activated carbon + mixed bed process. Applicable scenarios: High-purity water used in printed circuit boards and surface mount technology, requiring compliance with total organic carbon limits. Process steps: After activation and modification, mesoporous activated carbon is packed into an adsorption tower. Reverse osmosis effluent is treated with mesoporous activated carbon before entering the mixed bed for deep purification.

2. Microbial control: Silver-loaded activated carbon filtration process. Applicable scenarios: High-purity water storage and distribution systems requiring control of bacterial counts to meet standards. Process Steps: Silver-loaded activated carbon is prepared by impregnation and drying, then packed into a filter for terminal sterilization and purification of the polished mixed bed effluent.

3. Water Quality Stability: Anti-fouling Activated Carbon Buffer Process

Applicable Scenarios: Scenarios with large fluctuations in raw water quality requiring stable resistivity. Process Steps: Anti-fouling activated carbon, after graft modification, is used for raw water pretreatment to buffer water quality fluctuations and ensure stable operation of subsequent systems.

VII. Application Process

Taking a high-end printed circuit board factory, a partner of Shanxi Xinhua Shengtan, as an example:

Deep Removal of Total Organic Carbon/Ions
After treatment by the mesoporous activated carbon tower, the total organic carbon and chloride ion content in the high-purity water is far better than the standard limits.

Microbial Control
After treatment by the silver-loaded activated carbon filter, the bacterial and endotoxin content is reduced to extremely low levels.

Water Quality Stability
The anti-fouling activated carbon buffer tower maintains a high degree of resistivity stability.

Application Results

• Yield: Corrosion of inner layer circuits on printed circuit boards is reduced to zero, eliminating batch scrap losses;
• Reliability: Solder joint cold solder joint rate is significantly reduced, and annual return losses are significantly decreased;
• Stability: Electroplating layer thickness uniformity is improved, and product defect rate is significantly reduced.

VIII. Application Results

After the upgrade, a high-end printed circuit board factory saw significant improvements in core indicators:

Indicators	Before renovation	After renovation	Increase/Decrease:	Compliance Status
Total Organic Carbon in High-Purity Water	12μg/L	1.8μg/L	85% Decrease	Compliance
Bacterial Content	20CFU/mL	0.3CFU/mL	98.5% Decrease	Compliance
Resistivity Stability	16.5±1.0MΩ·cm	17.6±0.05MΩ·cm	95% Decrease	Compliance
Batch Waste Loss	80万元/月	0	100% Decrease	—
Customer Return Rate	8%	0.5%	93.8% Decrease	—

IX. Core Advantages

Customized solutions for electronic component manufacturers offer three major advantages:
Highly Targeted Products: Mesoporous activated carbon focuses on removing total organic carbon and ions; silver-impregnated activated carbon focuses on controlling microorganisms; and anti-fouling activated carbon focuses on stabilizing water quality.
Win-Win for Yield and Cost: Batch scrap losses are eliminated, resulting in substantial annual savings; operating costs are only half that of traditional processes, and the investment payback period is short.
Compliant and Reliable: Certified by multiple international industry standards; integrated into the supply chains of several leading electronics companies.

X. Cost Analysis

Taking a high-end printed circuit board factory with a monthly production capacity of 100,000 square meters as an example:

Project	Activated carbon process	Traditional crafts
Initial Investment	2-3 million yuan	1.5-2.5 million yuan
Annual Operating Costs	800,000 yuan	1.5 million yuan
Annual Scrap Loss	0	5 million yuan
Annual Return Loss	300,000 yuan	1.5 million yuan
Annual Total Costs	1.1 million yuan	8 million yuan
Annual Cost Savings	6.9 million yuan	—

XI. Why Choose Us?

Technical Strength: We develop specialized activated carbon products tailored to the needs of the electronic components industry, effectively addressing industry pain points such as excessive total organic carbon, microbial contamination, and water quality fluctuations.

Global Service: With production bases in Shanxi, Ningxia, and Fujian, our annual capacity is 45,000 tons. We support customized production and localized delivery, providing rapid response to your needs within 72 hours.

XI. Why Choose Us?

Mature and Reliable Deep Treatment Solutions. Technical Strength: We develop specialized activated carbon products to address three major industry pain points: COD, nitrogen and phosphorus, and sludge. Global Service: Three production bases with an annual capacity of 45,000 tons support customized solutions and rapid delivery.