底泥中磷的原位化学控制试验研究-环境工程专业论文.docxVIP

西安建筑科技大学硕士学位论文 西安建筑科技大学硕士学位论文 西安建筑科技大学硕士学位论文 西安建筑科技大学硕士学位论文 In-Situ Chemical Control Experimental Study on the Sediment Phosphorus Specialty: Environmental Engineering Name: Kang Zengjun Instructor: Professor Yuan Linjiang Abstract In recent years, the eutrophication of lakes and reservoirs is very serious in our country. Nitrogen and phosphorus are the main factors that cause eutrophication. After the nutrients are uptaken in water,some will deposit down to the sediment with the death of microorganisms. With the more efforts in management sewage, the external source nitrogen and phosphorus has very little. But nitrogen and phosphorus in the sediments become the main factors that cause eutrophication. Control the release of phosphorus in sediments is an essential to treat eutrophic waters. More and more attention are paid to the in situ control technology of sediment phosphorus release. However, a systematic study is still required. Taking No. 2 Lake District sediments of Yan Ming Lake as the research object in simulated laboratory conditions, the paper studied the disciplines of phosphorus release in the interface of sediment pore water and the interface of sediments-water and also investigated the control effects of different in situ control technologies including calcium nitrate, zeolite capping and the combination of aeration and zeolite capping technology. The main results and conclusions are as follow. Temperature and pH have a very significant impact on the phosphorus release of sediment. With temperature（25℃）increasing，phosphorus releasing from sediment is faster and total phosphorus concentration in the pore water is higher. Alkaline conditions and acidic conditions are favorable for phosphorus release to the pore water, as pH is 5 , 7 and 9, the maximum total phosphorus concentration in the pore water was 1.030mg/L，0.915mg/L，1.175mg/L respectively. In the interface of sediments overlying water, temperature, pH, DO and disturbance have a gre