Monitor the pressure difference and SDI value: The automatic control cabinet should integrate the pressure difference gauge and SDI value (silt density index) monitoring function to monitor the inlet and outlet pressure difference and SDI value of the filter in real time. When the inlet and outlet pressure difference exceeds the set threshold or the SDI value is greater than the set value (such as 4), the automatic control cabinet should automatically trigger the backwash program.
Optimize the backwash trigger conditions: According to the actual water quality and filter design requirements, adjust the set thresholds of the pressure difference and SDI value to ensure the timeliness and effectiveness of the backwash.
2. Accurately control the backwash parameters
Control the backwash water volume: The automatic control cabinet should be able to accurately control the backwash water volume. Generally, the backwash water volume is 2.5 to 4 times the forward wash water volume, and 3 times the water volume is usually selected. Ensure that the backwash water volume is sufficient to effectively flush impurities in the filter layer.
Adjust the backwash intensity and time: The backwash intensity should be controlled within the range, and the time is generally 5-15 minutes. The automatic control cabinet should automatically adjust the backwash intensity and time according to the actual water quality and filtration conditions to achieve the best cleaning effect.
Stable backwash flow rate: The backwash flow rate should be moderate, generally 2 to 3 times the filtration speed, but not exceeding the pressure limit of the filter material. The automatic control cabinet should be able to stably control the backwash flow rate to avoid damage to the filter material caused by too high or too low flow rate.
3. Application of auxiliary flushing methods
Air scrubbing: Add air scrubbing during the backwashing process, and inject compressed air to make the air generate bubbles between the filter materials to further loosen and remove stubborn impurities attached to the filter materials. The automatic control cabinet should be able to accurately control the input intensity of compressed air to avoid the loss of filter materials due to excessive intensity.
Combined flushing: Combine multiple flushing methods such as water backwashing and air scrubbing to improve the flushing effect. The automatic control cabinet should be able to automatically switch the flushing method and adjust the flushing sequence and time as needed.
4. Protect the filter and filter media
Control the expansion rate of the filter layer: The automatic control cabinet should be able to accurately control the expansion rate of the filter layer, generally controlled between 40%-50%. It can not only make the filter media fully expand, expose and remove deep impurities, but also avoid causing confusion or loss of the filter media.
Ensure the uniform distribution of backwash water: The automatic control cabinet should ensure that the backwash water is evenly distributed and flows along the predetermined path to prevent the formation of cavitation, local blockage or uneven wear of the filter layer.
Monitor the operating status of the backwash pump: The automatic control cabinet should integrate the backwash pump operating status monitoring function to ensure stable water flow. If necessary, use a self-priming pump or auxiliary pump to maintain a stable backwash pressure and flow.
5. Optimize maintenance cycle and replace filter media
Set maintenance cycle: According to water quality monitoring data and filter operating status, the automatic control cabinet should be able to automatically calculate and set a reasonable maintenance cycle. Including backwash cycle, filter media replacement cycle, etc.
Reminder to replace filter media: When the filter media reaches its service life or the filtering effect is significantly reduced, the automatic control cabinet should be able to automatically issue a reminder to replace the filter media.
6. Intelligent management and remote monitoring
Integrated intelligent monitoring system: The automatic control cabinet should integrate water quality online monitoring equipment to monitor the water quality indicators of inlet and outlet water (such as turbidity, suspended solids, chemical oxygen demand, etc.) in real time. Automatically adjust the backwash parameters and maintenance plan according to the monitoring results.
Support remote monitoring and operation: The automatic control cabinet should support remote monitoring and operation functions, so that operation and maintenance personnel can understand the filter operation status anytime and anywhere and perform remote control.
Through the implementation of the above measures, the intelligent functions of the multi-media filter automatic control cabinet can be fully utilized to optimize the backwash process, increase the service life of the filter material, and ensure that the filter maintains high efficiency in the long term. This not only helps to improve the water quality treatment effect, but also reduces operation and maintenance costs and improves overall operational efficiency.
