Sexual carbon filter has two functions:
(1) using the activity of activated carbon to remove the free chlorine in the water surface, in order to avoid the chemical water treatment system of ion exchange resin, especially the cation exchange resin by free chlorine oxidation.
(2) to remove the organic matter in the water, such as humic acid, and so on, to alleviate the pollution of organic matter of strongly basic anion exchange resin.
According to statistics, in activated carbon filter, can remove the water 60% ~ 80% of the colloid material: 50% iron and 50% ~ 50% of organic matter, etc.
Activated carbon filter in actual operation, the main consideration into the bed water turbidity, backwashing cycle, backwashing intensity, etc.
(1) into the bed water turbidity.Into the high turbidity water bed, will bring excessive impurities activated carbon filter, these impurities trapped in the activated carbon filter, and blocked filter gap and surface of activated carbon, hinder the full play of the adsorption effect.Will run on for a long time, intercept stay between activated carbon filter, rushed out of the mud membrane formation, activated carbon aging failure.
So the water into the activated carbon filter, it is better to control the turbidity below 5 mg/L, to ensure its normal operation.
(2) the backwashing cycle.The length of the backwashing cycle is the main factor related to the filter effect is good or bad.Short, waste of backwashing water backwashing cycle;The long cycle of backwashing are influence activated carbon adsorption effect:
Generally speaking, when the bed water turbidity below 5 mg/L, backwashing time should be 4 ~ 5 days.
(3) the backwashing intensity.In activated carbon filter backwashing filter layer whether inflation of filter layer flushing, impact is bigger.Filter layer expansion ratio is too small, the lower the activated carbon suspension does not rise, its surface irrigation is not clean;When inflation is too large, easy to run "c".
In the operation of general control the inflation rate is 40% ~ 50%.
(4) the backwashing time.General inflation rate is 40% ~ 40% when the filter layer, backwashing intensity for 13 ~ 15 l/(m2, s), the activated carbon filter backwashing time for 8 ~ 10 min. |