How To Treat Backwash Wastewater From Activated Carbon Filters?

 The main methods for treating backwash wastewater from activated carbon filters are as follows:

Direct reuse \ Backwash wastewater can be directly returned to the water plant's front-end treatment facilities. The wastewater is then mixed with the raw water and retreated. This method is suitable for wastewater with good quality and low suspended solids content, and must meet the requirement of not affecting the quality of the effluent.
 Reuse after processing

Coagulation and sedimentation pretreatment Adding flocculants causes suspended particles and microorganisms to form flocs, which are then settled to remove impurities.

Membrane treatment Microfiltration or ultrafiltration membrane separation technology is used to remove small particulate impurities and microorganisms from wastewater. The effluent can be disinfected and reused in a clear water tank or activated carbon adsorption tank.

air flotation treatment It is suitable for wastewater with high organic matter, iron, manganese and algae content, and can be reused after removing impurities through air flotation separation.

If the wastewater quality is poor, the treatment cost is high , and the local water source is sufficient, the backwash wastewater can be discarded and directly discharged into the sewage system.
The following points should be noted during the process:

The return water volume should be evenly distributed to avoid shock loads, and the maximum return flow rate should not exceed 5% of the water plant's design flow rate.
 A flow meter and a backup pump need to be installed to ensure the stable operation of the reflux system.

The treated wastewater should meet the relevant water quality standards to ensure that it does not affect the quality of the water discharged from the water plant.

The above methods can be selected according to specific water quality and economic conditions to achieve effective treatment and reuse of backwash wastewater.