Industrial water treatment is usually used fixed-bed type activated carbon filter, and its structure is the same as the general pressure filter to remove organic matter and residual chlorine effect depends on the height of the activated carbon layer, the volume. Figure 2-39 shows the change of the active carbon layer
System design of activated carbon failure to determine:
Absorption of organic matter in water – removal rate of not more than 15% to 20% as a failure, or according to water quality requirements.
Absorption of residual chlorine in the water – chlorine in the water is greater than 0. 1mg / L as failure.
In order to maintain the water quality, activated carbon utilization rate can not exceed the set penetration point, penetration point of about 0. 05Co. When the concentration of organic matter in the effluent reached 0.95Co, the adsorption capacity of activated carbon was completely exhausted. The operation of the activated carbon filter, backwashing flow rate and the pressure drop generated by the activated carbon layer, the relationship between the expansion rate of activated carbon layer shown in Figure 2-40. Figure 2-41 shows. Ozone-biological activated carbon treatment process should adopt the carbon pool water rinse, and consider the initial water removal measures. In order to adjust the backwashing strength, in the backwash water pipe should be set on the adjustment and measurement device. Activated carbon performance indicators should meet the national standard GB7701.4-1997 “purified water with coal activated carbon” requirements.