Abstract
Single man-sieving sand materials were tested in Constructed Rapid Infiltration System (CRI). We selected two different sand sizes as filling filter materials, with three different heights in 15cm, 30cm and 45cm respectively. The system was operated for totally 11 periods in 33 days under a hydraulic load of 1.5m/d and wetting-drying ratios of 1:5. Relevant data about COD, N and P in the effluent are then analyzed. Results show that Constructed Rapid Infiltration System can effectively remove the pollutants in municipal wastewater, thus reduce the adverse effects to local area, which can be feasible to apply as the secondary treatment in small towns. Test shows that under the selected hydraulic load and wetting-drying ratios, the optimal operation condition is the 45cm-high packed column, with the removal rate of 35~75% COD, 50~100% dissolved orthophosphate and 55~98% TP, which was far beyond the normal CRI removal rate of TP as low as 30%, to imply a innovation method for integrated waste water treatment system, especially for TP
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