Effect Of Different Salinity,sediment And Change Rule On Water Quality Variations Of The Pond Replenished By Reclaimed Water

The eutropHication of landscape water has always been a hot field in landscape water research.The eutropHication of landscape water is mainly influenced by the nutrient concentration in water body,and various environmental factors such as light and water temperature are important for eutropHication of water Impact.In particular,many urban artificial landscape water sources using recycled water,making this part of the landscape water is more prone to water eutropHication,to carry out under different control conditions of recycled water supply landscape water quality changes in the law has become the current landscape water research hot issues.The effects of different external factors on the water quality of landscape water were simulated by several artificial aquariums.The release and enrichment of pollutants in the sediment and the change of the water quality of the overlying water were simulated by different experiments.Impact.The main contents of this paper are as follows: In this paper,several important external factors influencing the eutropHication of landscape water are selected,which are water salinity,vertical disturbance and sediment sediment,using the reclaimed water as the water source.The effects of these factors on the water quality of landscape water were studied.During the experiment,the external conditions of the test were strictly recorded,including the water temperature and so on.The effects of salinity and vertical disturbance on sensory indexes,nutrient concentration,algal growth and algal population change were investigated.The test results are as follows:(1)Under the optimum salinity(3g / L),the algae in the water body are thefastest and the eutropHication degree of the water body is higher.The high salinity can significantly inhibit the growth and reproduction of algae and salt Changes in the degree of algae can cause changes in the dominant species of algae.Salinity affects the water quality of the landscape water by affecting the growth and reproduction of algae in the water body.(2)Under low flow rate disturbance(0 ~ 4.6m / h),the higher the vertical perturbation flow rate is more likely to be inhibited.Under the high disturbance intensity(7.5 ~ 30 m / h)and 22.5m / h,the inhibitory effect on the growth of algae in water was the most significant,and the growth and reproduction of algae were promoted when the disturbance intensity was greater or less than that.Compared with the vertical perturbation test group,the concentration of chloropHyll a in the flow test group increased rapidly,which indicated that the vertical disturbance was more effective in inhibiting the growth of algae.And the change of flow rate can lead to the change of algae dominant population in water body.(3)The exchange of nutrients between the overlying water and the sediments is a dynamic equilibrium relationship,and there is a critical concentration of adsorption-release.The high concentration of nutrients in the overlying water is accumulated in the sediment.Disturbance is an important factor affecting nutrient release,and the disturbance increases the critical concentration of adsorption-release to accelerate the release of nutrients in the sediment.The critical concentration of nitrogen in the sediments of Fuhe River was 0.7 ~ 1.09 mg / L,the disturbance was increased to0.8 ~ 1.32 mg / L,and the critical concentration of pHospHorus was 0.07 ~ 0.08 mg / L.Disturbance increased to 0.08 ~ 0.12 mg / L.The critical concentration of nitrogen adsorption in the sediments of Siyuan Lake was 0.57 ~ 3.24 mg / L,and the disturbance was 2.23 ~ 4.34 mg / L.The critical concentration of pHospHorus adsorption was between 0.36 and 0.53 mg / L,and increased from 0.40 to 0.82 mg / L.