Experiments were conducted to investigate the feasibility to use natural vermiculite as fillers in constructed wetlands to enhance the removal rate of N from municple sewage. Bio-films on vermiculite granules in glass service were formed in the pro-treatment with stable wastewater influent. The results indicated that the removal rate of both NH4^＋-N and T-N in the bio-vermiculite system was significantly higher than that in the control and the effect was stable. Changes in N forms were observed, indicating that the removal of N was an anaerobi...
