Solution to Excessive TOC in Ultra pure Water System
Excessive total organic carbon (TOC) in ultra pure water systems is a key issue affecting water quality and needs to be strictly controlled in the semiconductor, pharmaceutical and other industries. To address the problem of excessive TOC, you can check and solve it from the following aspects:
Raw Water Quality
Check raw water pollution: Check the TOC level in the source water. If the source water contains a high level of organic substances, it will be difficult for the water treatment system to completely remove them.
Adjust the pre-treatment system: If the source water is severely polluted with organic materials, consider using activated carbon filters, ultraviolet (UV) disinfection, or ozone as pre-treatment methods to further remove organic substances from the raw water.
Replace or Clean RO Membranes
RO membranes are key components in ultra-pure water filtration systems, playing a crucial role in removing dissolved salts and organic substances. If the RO membrane becomes polluted or aged, its performance will decrease, leading to TOC exceeding the standard.
Regular cleaning of RO membranes: Regularly clean RO membranes to remove accumulated organic substances, minerals, and other contaminants.
Replace RO membranes: If the RO membrane is severely polluted or has been in use for an extended period, consider replacing the RO membrane components.
Optimize the EDI System
The EDI system is a key component of the post-treatment process following the RO membrane, used to further remove ions and organic substances from the water. A malfunctioning EDI system can also lead to TOC exceeding the standard.
Check EDI current and voltage: The EDI system requires specific current and voltage for proper operation. Regularly check these parameters to ensure the ion exchange and electrodialysis processes are functioning smoothly.
Replace EDI resin: EDI resin may become saturated after prolonged use, leading to a decrease in removal efficiency. Regularly check and replace the resin to help lower TOC levels.
Use Ultraviolet (UV) Oxidation Technology
UV oxidation technology can effectively degrade organic pollutants that are difficult to remove by conventional methods.
Enhance UV system: Strengthen the UV system, as ultraviolet light can break down organic molecules in the water, reducing the TOC value.
Use high-intensity UV lamps: Using high-intensity UV lamps can improve the water purification effect.
Increase the Recovery Rate of the Reverse Osmosis (RO) System
Adjust the recovery rate: Increasing the recovery rate of RO membranes can help reduce TOC levels. A lower recovery rate means less water is treated and discharged, reducing the concentration of organic substances that remain untreated.
Maintain and Clean Pipes
Pipes and storage tanks can accumulate organic matter over time if not cleaned regularly. Thorough cleaning of the system can remove these accumulated substances, reducing TOC levels.
Use Activated Carbon Adsorption
Activated carbon is an effective adsorbent for organic substances, especially low molecular weight organic compounds. Configuring activated carbon filters in the ultra-pure water system can further reduce TOC levels.
Regularly replace activated carbon: Activated carbon has a certain saturation period, so it is important to replace it regularly to maintain its adsorption capacity.
Install Dedicated TOC Removal Equipment
For ultra-pure water systems with extremely strict water quality requirements, additional TOC removal equipment can be installed, utilizing methods such as ion exchange or redox reactions to further reduce organic substances in the water.
Monitoring and Online Detection
Real-time TOC monitoring: Install online TOC monitoring equipment in the ultra-pure water system to continuously track changes in water quality. This allows for the early detection of abnormal fluctuations in TOC values and timely adjustments.
Regular water quality testing: Regularly test the water quality to identify and correct any issues within the system that may lead to TOC exceeding the standard.
Regular maintenance and testing are essential to ensure the system operates efficiently and avoid TOC exceeding the standard. By implementing the above measures, TOC levels can be effectively reduced, ensuring the ultra-pure water system meets the required standards.
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