Let's start with the function of the activated carbon filter to talk about the precautions for its operation.

The activated carbon filter has two functions:

(1The active surface of activated carbon is utilized to remove free chlorine from water to prevent ion exchange resins, especially cation exchange resins, in chemical water treatment systems from being oxidized by free chlorine.

(2Remove organic matter from water, such as humic acid, to reduce the contamination of strongly basic anion exchange resins by organic matter.

According to statistics, water can be removed through an activated carbon filter60%~80%Colloidal substances50%The iron on both sides and50%~60~Organic substances, etc.

In the actual operation of activated carbon filters, the main considerations include the turbidity of the influent water, the backwashing cycle, and the backwashing intensity, etc.

(aTurbidity before entering the bed

High turbidity in the bed will bring excessive impurities to the activated carbon filter layer. These impurities are trapped in the active filter layer and clog the gaps in the filter tank and the surface of the activated carbon, hindering the performance of its adsorption effect. If it operates for a long time, the retained substances will remain between the layers of activated carbon, forming a mud film that cannot be washed away, causing the activated carbon to age and become ineffective.

So the water entering the activated carbon filter should have its turbidity controlled within5NTUThe following is to ensure the normal operation of the device.

(bBackwashing cycle

The length of the backwashing cycle is the main factor affecting the performance of the filter. The backwash cycle is too short, resulting in the waste of backwash water. If the backwashing cycle is too long, it will affect the adsorption effect of activated carbon

Generally speaking, when the turbidity of the bed is5NTUWhen the following situations occur, one should4~5Wash once every day.

(cBackwash strength

During the backwashing of activated carbon filters, the expansion rate of the filter layer has a significant impact on whether the filter layer flushing is thorough. The expansion rate of the filter layer is too small, and the activated carbon in the lower layer cannot be suspended, resulting in the surface of the device not being cleaned thoroughly. When the expansion rate is too high, it is easy for "carbon" to escape.

  During operation, the general controller expansion rate is40%~50%.

(dBackwash time

Generally, when the expansion rate of the filter layer is40%~50%The backwashing intensity is13~15L/(m2·s)The backwashing time of the activated carbon filter is8~10min.