改性沸石耦合活性炭强化混凝处理微污染源水

In recent years, the water quality of drinking water sources in China is facing very serious situation, especially for micro-polluted water, and the existing water plant conventional treatment process cannot effectively ensure the removal of pollutants from the water plant, so it is necessary to use enhanced coagulation treatment technology, economically to improve the water quality, and to ensure the safety of drinking water is particularly important. The combination modified zeolite powder (MZ) coupling powder activated carbon (PAC) to enhance coagulation removing micro-pollution sources of ammonia nitrogen (NH₃-N), oxygen consumption (COD_Mn), UV₂₅₄ and turbidity were studied using static adsorption and six-link mixer beaker experiments. Experimental water was taken from micro-polluted water sources in a city of south China, and the water quality was more seriously polluted with higher concentrations of soluble organic matter. The results showed that MZ increased the surface area and average adsorption aperture, the surface of MZ was rougher while the crystal structure of the MZ had not changed and the removal ability of NH₃-N enhanced. MZ-PAC adsorption had the synergetic action for NH₃-N removing, there was slightly antagonism for COD_Mn removal. MZ-coupled PAC to enhance coagulation significantly improved the removal of NH₃-N, COD_Mn, UV₂₅₄, and turbidity, with the treated water NH₃-N<0.5 mg/L, COD_Mn<3.0 mg/L and turbidity<1 NTU. The different cast-plus methods of MZ and PAC influenced the enhanced coagulation treatment effect, and the best way to add PAC and MZ was in the early stages of flocculation, which avoided the flocs of MZ packages, strengthened the PAC on organic matter removal, and further improved the removal of NH₃-N by MZ. Otherwise, the turbidity of the water increased, especially in the late stage of flocculation. Coupling enhancing coagulation results in lower the absolute value of Zeta potential and repulsion between colloid. Floc size increasing and sticky phenomenon made the resistant ability stronger.