Constructed rapid infiltration system(CRI) is a new type of wastewater land disposal technique based on the traditional wastewater rapid infiltration.The three step series CRI for removal of pollutants by using preparation of the pig manure wastewater was studied.The results showed that the removal rates of COD and NH3-N were 81% and 94.5% respectively,and all the effluent met the discharge standard of pollutant for livestock and poultry breeding.Furthermore,the three step series CRI could be an effective m...