Experimental Study on CRI Technology in the Degradation of COD in Wastewater Reuse

With the improvement of the urbanization level, the mixed city water has surged and the traditional denitrogenating cost in the course of wastewater reuse has been unbearable. This experiment used the technology of the constructed rapid infiltration (CRI) and applied the soil column simulation method in the laboratory. The results show that nitrogen removal rates of two soil columns are 73.73% 75.54%, 66.70% 77.81% and 79.33% 73.08% under three wet/ dry (3 h/9 h, 6h/18 h, 8 h/40 h) ratios conditions, individually. The same soil column with the same wet/ dry ratio has a higher ammonia nitrogen removal rate within a shorter operation time. The comparison result of experiments show that the artificial soil mixture ratio in column 2 is better than that of column 1, arriving at the optimum operation conditions of the system.