The Study On The Impact Of N And P On Algal Growth In Landscape Water Using Reclaimed Water As Resourse

Eutrophication had become a global environmental problem, causing the universal customs Note. Renewable water as a special kind of water resources plays an importent role in urban life and in industrial and agricultural production, which cannot be ignored. Reuse the reclaimed water for the landscape can improve urban water environment in China and ease the pressure of water shortages. However, due to the poor mobility of landscape water body and the high value of the nitrogen and phosphorus of renewable water, so that renewable water supplying to landscape water body will be more vulnerable to be eutrophication.In this experiment, using the actual landscape of Beijing City as the experimental basis, using laboratory simulation as the principal means explored the main factors of the landscape water eutrophication.Microcysti aeruginosa and chlorella vulgaris, two types of reclaimed water algaes for landscape water were mainly studied on in this article.we researched on different impact on algal growth of different Inoculation of algal, on the relationship between Nitrogen, phosphorus and eutrophication to drawn the main conclusions as follows:(1)Different size of initial inoculum of Microcystis aeruginosa did not affect greatly of for the growth of model. However, the initial inoculum size has a direct impact on the growth rate of algae. In order to avoid the error caused false impression caused by the initial inoculum we must insure put almost the same values initial.(2)The growth of algae in the water mainly effects by the nitrogen and phosphorus. And the role of nitrogen and phosphorus are often interrelated, Different nitrogen and phosphorus on the proportion of cells not only affects the growth rate, even also affect substances storage.(3) The experiments proove that algae with the ability of reserving phosphorus, in the new environment, the algae will be able to save almost all phosphorus in water and store in the body first of all, phosphorus has a hidden existence. With the growth of necessary or the change of the environment, the algaes timely released phosphorus in the body into the water to keep up growth. When using Phosphorus content in the rivers and lakes to determine whether eutrophication has happened, we should pay attention to the existence of phosphorus concealed so as not to ignore the sudden bloom of phytoplankton in the precursor.Therefore, to ensure water security of the reclaimed water landscape, we should continue to maintain a lower amount of phosphorus.(4) Chlorella vulgaris has the absorptive capacity of the phosphorus is much higher than that of the nitrogen, for the certain growth rate, the faster increasing concentration range of total phosphorus is 0～1mg/ L, there is no clear interval of total nitrogen concentration of the growth.