Preparation of antibacterial adsorption materials and application in reclaimed water treatment

Modified zeolite with better nitrogen removal effect was used to prepare antibacterial adsorption materials for treating the secondary effluent of high-concentration coliform and ammonia nitrogen. Among Ag⁺, Zn²⁺ and Cu²⁺ ions, silver-supported antibacterial adsorption materials have the best antibacterial properties and are beneficial to nitrogen removal. The optimal preparation conditions are the following:AgNO₃ concentration of 85mg·g^-1, pH 6-7, preparation time of 120min, reaction temperature of 40℃, and reaction speed of 150r·min^-1. After the optimization, the silver content in the prepared materials is 49.79mg·g^-1. 0.5g·L^-1 of silver-supported antibacterial adsorption materials and 2g·L^-1 of zeolite were applied to treat renewable water under the optimal conditions. The results show that the reaction time is 120min, the sterilizing rate is 98.87%, the removal rate of ammonia nitrogen is 66.54%, the mass concentration of residual nitrogen is 8.36mg·L^-1, which achieve the water-quality indexes of the urban miscellaneous water.