A Research on Purification Effect of the Substrate of Constructed Wetlands with FS-G-CD-S-SS Model on Phosphorus Pollution

A mixed substrate named FS-G-CD-S-SS, consisting of fine sand, gravels, coal dust, slag and sewage sluge in a proportion of 20% each in size, was made in order to test effect of purification on pollutants. Multiple comparisons and correlation analysis were used to analyze physical and chemical properties and the absorption capacity of phosphorus. The test results show that the phosphorus purification capacity and the substrate of FS-G-CD-S-SS model has no linear relationship when the concentration of wastewater with phosphorus ranges 100mg/L similar to 500mg/L, but that the maximum phosphorus purification capacity reached when the concentration was 200mg/L. Moreover, there is no linear relationship between FS-G-CD-S-SS and purification capacity of phosphorus when drainage time is 0.25h similar to 48h, but the best purification results reached when the drainage time is 24h. There are no significant differences between the removal rate and the substrate of FS-G-CD-S-SS at different water concentrations and time of watering and drainage. (C) 2011 Published by Elsevier Ltd. Selection and/or peer-review under responsibility of Conference ESIAT2011 Organization Committee.