改性沸石耦合活性炭强化混凝处理微污染源水

Modified zeolite-coupled activated carbon enhanced coagulation treatment of micro-pollution source water

采用静态吸附和六联搅拌烧杯实验进行组合改性沸石粉(MZ)耦合粉末活性炭(PAC)强化混凝去除微污染源水氨氮(NH3-N)、耗氧量(CODMn)、UV254和浊度等效能研究。结果表明,组合改性后沸石粉的比表面积和平均吸附孔径增加,对NH3-N交换去除能力增强。MZ和PAC联用吸附对去除NH3-N具有协同作用,对去除CODMn略有拮抗作用。而MZ耦合PAC强化混凝则显著提高了NH3-N,CODMn,UV254和浊度的去除效果,出水NH3-N<0.5 mg/L,CODMn<3.0 mg/L,浊度<1 NTU。MZ和PAC不同投加方式显著影响强化混凝处理效果,其中最佳投加方式为絮凝初期投加PAC和MZ,避免絮体包裹MZ,加强PAC对有机物的去除,进一步提高MZ对NH3-N的去除效果。耦合强化混凝使Zeta电位的绝对值降低,胶体间斥力减少,絮体粒径增大,粘黏现象明显,抗冲击能力更强。

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(CODMn),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 CODMn removal.MZ-coupled PAC to enhance coagulation significantly improved the removal of NH3-N,CODMn,UV254,and turbidity,with the treated water NH3-N<0.5 mg/L,CODMn<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.