Abnormal Phenomena and Handling Measures During Co-Flow Bed Regeneration in Pure Water Treatment

1

During regeneration, the bed cannot be pumped with regeneration fluid.

1. Excessive pressure inside the bed;

2. The pipeline for the regenerated liquid is blocked.

3. The regenerated liquid inlet valve cannot be opened.

4. The outlet valve of the regeneration metering box cannot be opened or is clogged.

5. Low vacuum in the hydraulic ejector

1. Check and open the regeneration drain valve to reduce the pressure inside the bed.

2. Check the inlet regenerated liquid pipe and valves for damage, and troubleshoot any issues promptly.

3. Check the condition of the regenerated liquid inlet valve and open it.

4. Open the metering box outlet valve or clear any blockages.

5. Check if the hydraulic ejector is working properly, if the water pressure is too low, and if the pipes are blocked; troubleshoot any malfunctions.

2

Water is returned to the metering tank during regeneration.

1. High pressure inside the bed

2. Low vacuum in the hydraulic ejector

3. The regeneration fluid valve on the running bed is not tight, causing high-pressure water to backflow from the running bed into the regeneration system.

1. Adjust the drain valve of the regeneration bed to appropriately reduce the pressure inside the regeneration bed.

2. Check the cause of low vacuum in the hydraulic ejector: If the system water pressure is low, increase the inlet water pressure of the hydraulic ejector; if the pipe is blocked, clean it promptly.

3. Close the regeneration fluid valve of the operating bed tightly.

3

Adding regenerated liquid to the metering tank is extremely slow.

1. Blockage in the pipeline from the storage tank to the metering box.

2. When the room temperature is below 15 degrees Celsius, concentrated alkali easily crystallizes and solidifies.

1. Remove contaminants promptly and take measures to reduce impurities in the regenerant.

2. Raise the indoor temperature to above 15 degrees Celsius.

4

Ion exchange resin exchange capacity decreases

1. Precipitates precipitate during resin regeneration

2. Insufficient regeneration dose or low concentration during regeneration.

3. Incomplete backwashing; suspended solids in the resin layer were not removed.

4. Excessive backwashing time depletes the resin exchange capacity.

5. The formation of "acidic acid" or "alkali" within the bed due to uneven flow can cause waste liquid to flow back up, contaminating the regenerated resin.

1. Test the heavy metal ion content of the raw water, strengthen the pretreatment process, and wash the precipitate with 3%-5% HCl.

2. Check the amount of regenerant used and strictly control the concentration of the regenerant solution.

3. Strengthen backwashing efforts and adjust backwashing time and intensity.

4. Adjust the washing time to prevent over-rinsing.

5. Investigate the cause of the flow deviation and eliminate it promptly.