Routine Maintenance and Repairs of Ultra-Pure Water Treatment Systems

It’s crucial to keep track of your ultra-pure water system’s operating data every day and carry out a comprehensive data analysis every week to monitor the overall performance of the equipment. By doing so, you can quickly identify and address any hidden issues and problems that arise. This process helps you find the most effective maintenance and preservation methods for your system. 

Figure 5 Ultra-pure Water Equipment for Lithium-ion Battery Production

Without data as a reference, it’s challenging to avoid equipment problems or prevent potential downtime situations. Additionally, lacking data makes it impossible to screen for future equipment issues and address them promptly. So always remember maintaining accurate records of your equipment’s operating data is of utmost importance.

Now, let’s dive into the regular maintenance and replacement cycles for your system’s components!

1. Bag Filters

Replace every 15-30 days or when the pressure difference exceeds 0.5kg/cm2. Failing to replace the filter bags on time can:

Figure 2 Bag filters.

  • Resulting in an output water oil content of >1 NTU, which doesn’t meet the contract’s water input requirements.
  • Lead to a significant pressure difference between the bag filter’s input and output water, reducing the flow at the backend.
  • Decrease the production capacity of the bag filter.

2. Security Filter Cartridges

Replace them every 15-30 days or when the pressure difference exceeds 0.5kg/cm2. Not replacing the filter cartridges on time can:

  • Cause a pressure difference of >0.5kg/cm2 in the filter, reducing the output water volume.
  • Resulting in decreased performance, physical damage, or chemical degradation of the reverse osmosis membrane

3. Precision Filter Cartridges

Replace every 2-3 months or when the pressure difference exceeds 0.5kg/cm2. Failing to replace the cartridges on time can:

Figure 3 Precision filter cartridges.

  • Cause a pressure difference of >0.5kg/cm2 in the filter, reducing the output water volume.
  • Lead to contamination of the EDI particles.

4. Membrane Filter Cartridges

Replace every 2-3 months or when the pressure difference exceeds 0.5kg/cm2. Not replacing the cartridges on time can:

  • Cause a pressure difference of >0.5kg/cm2 in the filter, reducing the output water volume.
  • Resulting in the final water quality not meeting contract requirements.

Figure 4 Membrane filter cartridges.

5. Cleaning Filter Cartridges

Replace them during cleaning. Not replacing the cartridges on time can:

  • Cause a pressure difference of >0.5kg/cm2 in the filter, reducing the output water volume.
  • Affect the effectiveness of the cleaning process.

6. Activated Carbon

Replace activated carbon approximately every 12 months.

Figure 5 Activated carbon.

  • Regular backwashing and forward washing are required.
  • Failing to replace the activated carbon on time can result in residual chlorine exceeding the standard ORP value of >200mv, causing oxidation of the subsequent RO membrane and EDI.

7. Quartz Sand

Replace quartz sand approximately every 24 months.

Figure 6 Quartz sand.

  • Regular flushing is required.
  • Not replacing the quartz sand on time can cause an input-output pressure difference of >0.7kg/cm2, reducing the water production volume and leading to decreased performance, physical damage, or chemical degradation of the reverse osmosis membrane.

8. RO Reverse Osmosis Membrane

Replace every 2 years or when primary output water quality exceeds 40us/cm. The secondary RO membrane can be replaced with the primary one when changing.

Figure 7 RO reverse osmosis membrane.

  • Delayed replacement and maintenance can cause high operating pressure, reduced water production, the output water quality of >20us/cm, and long-term operation affects the stability and lifespan of the EDI.

9. UF Ultrafiltration Membrane

Replace UF membrane approximately every 2 years (depending on usage and regular maintenance).

Figure 8 UF ultrafiltration membrane.

  • Delayed replacement and maintenance can cause high input water pressure, reduced output water flow, and output water quality that doesn’t meet contract requirements.
  • This can result in the subsequent reverse osmosis system not producing water continuously, leading to decreased performance, physical damage, or chemical degradation of the reverse osmosis membrane.
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