Dynamic Rule of Organic Matter Removal in Constructed Rapid Infiltration

In order to draw a conclusion of the average longitudinal removal rate of variant forms organics and presents the influent concentration and the hydraulic load curve, the removal rate and form change of the organic pollutants with the different height of the CRI are analyzed. The results indicated that: Under this experimental condition, the reduction of the organics in the CRI mainly occurred within the 0-20 cm substrate below the pipe distributor, and the smaller the hydraulic load of influent, the higher the removal ratio of the organic pollutants in the substrate section. Under the condition that the CRI used the coarse sands as the substrate and kept the influent hydraulic load less than or equal to 1.0 m³/(m²ldrd), the effective height of the organics removal was 100 cm. It also showed that the average degradation rate of different kinds of the organic pollutants has a maximum value in the 0-20 cm substrate section below the pipeline. Furthermore, the degradation ratio of different kinds of the organics falls badly with increase in depth of the longitudinal direction.