原位技术控制湖泊沉积物中磷释放的研究

Effect of in-situ control techology of phosphorus release in lake sediments by laboratory simulation.

通过实验室模拟试验研究曝气供氧、沸石覆盖和硝酸钙等原位控制东洞庭湖沉积物磷释放技术效果,试验结果表明:好氧时,曝气供氧对上覆水磷浓度的控制效果较差,当溶解氧≥20%,水中磷浓度不随溶解氧含量的增加而增加,控制效果依次为:硝酸钙原位处理>沸石覆盖>曝气≥未处理;厌氧时,控制效果依次为:硝酸钙原位处理>曝气>沸石覆盖>未处理;扰动条件下,控制水体中磷浓度效果依次为:投加硝酸钙原位处理>沸石覆盖>曝气>未处理,但硝酸钙处理在不同水力作用下保持上覆水磷浓度稳定性不如沸石覆盖;沸石覆盖和硝酸钙原位处理都增大了水体耗氧量,其中以硝酸钙处理最为显著,可使水体复氧功能减弱.

Taking Dong Dongting Lake sediments as the research object.The effects of phophorus concentration and water quality of overlying water under in-situ control techology,including zeolite capping,calcium nitrate in-situ treatment and aeration,were analyzed,by laboratory simulation.The effects of the control of phosphorus concentration in overlying water in aerobic environment was very badly,when the dissolved oxygen saturation more than 20%,the concentration of phosphorus did not be changed in water,and the effects of control was followed by calcium nitrate in-situ treatmentzeolite cappingaeration3untreated.When under anaerobic condition,the effects of contral was followed by calcium nitrate in-situ treatment aerationzeolite capping untreated.Under the hydrodynamic condition,the effects of control was followed by calcium nitrate in-situ treatmentzeolite cappingaerationuntreated,however,under different of hydrodynamic condition,the stability of phosphorus concentration to maintain in overlying water under zeolite capping was better than calcium nitrate in-situ treatment;Zeolite capping and calcium nitrate in-situ treatment were increased the oxygen consumption in water,and calcium nitrate in-situ treatment was the most significantly,and it was made the water lose reoxygenation function.