The removal effects of 3 kinds of filter material at different depth and different temperature on ammonium-nitrogen were studied by artificial rapid infiltration system to improve the slightly polluted river water on the basis of land treatment.The result showed that the artificial rapid infiltration system had good ammonium-nitrogen removal ability.The average removal rate of the 3 kinds of filter material was 59.04%,60.43% and 68.19%,resp.The ammonium-nitrogen removal rate was decreased with the increasin...