改性沸石生物滤池对微污染饮用水源水中氨氮的去除研究-环境工程专业论文.docxVIP

暨南大学硕士学位论文改性沸石生物滤池对微污染饮用水源水中氨氮的去除研究 暨南大学硕士学位论文 改性沸石生物滤池对微污染饮用水源水中氨氮的去除研究 PAGE PAGE VI Abstract With economic development in recent years, emissions of some domestic sewage, industrial and aquaculture wastewater result in high concentrations of ammonia in drinking water, which have posed a serious threat to human health. In order to improve the water quality and protect human health, the removal of ammonia nitrogen in the slightly polluted source water has become one of the current hot spot. In the study, the modified zeolite was used as biological carrier of the filter, and mixed bacteria containing nitrifying and denitrifying bacteria as biological inoculums. After biofilm hung on surface of modified zeolite, the filter could systematically operate to treat simulated micro-polluted water. The main contents were as follows: Salt (NaCl solution) for modifying the natural zeolite was first performed and then thermally decomposed to improve its ammonia adsorption performance. The characterization of the natural zeolite and modified zeolite were analysed by BET, SEM and XRD. The comparison of ammonia adsorption performance of the two zeolites was also studied in paper. The results showed as below: the ammonia removal of modified zeolite was higher when the sodium chloride concentration was 2.0 mol/L. After modification, surface morphology structure of zeolite became more porous, and surface roughness improved greatly. However, the crystal structure had not been destroyed, with increased sodium content and significantly reduced calcium content. Under the same condition, the modified zeolite had better ammonia adsorption performance than natural zeolite. Modified zeolite was improved the absorption capacity of ammonia, and greatly accelerated the absorption rate of ammonia. The NH4+ ion exchange capacity increased from 0.56 mg/g to 0.79 mg/g and the adsorption time reduced from 12 to 4h after modification. Ammonia, nitrogen and CODMn performance degradation by the mi