Pilot study on prevention of odor pollution by shading and aeration in plain reservoirs
The shallow depth of plain reservoirs is conducive to the growth of odor-producing algae living in the sub-surface layer,resulting in severe odor pollution.To ensure the quality of drinking water,it is of great significance to reduce odor pollution from the source.To investigate the effectiveness of in-situ treatment technology including shading and aeration on the prevention and control of odor pollution in plain reservoirs,and to analyze their impact on aquatic ecology,a pilot test was conducted in Tianjin BR Reservoir,where odor pollution was severe in summer because of algae.The results showed that shading and aeration measures significantly reduced odor concentration if arranged before the emergence of odor pollution.The total odor mass concentration of the June shading and aeration group N1,the June aeration group N2,and the June shading group N3 decreased by 53.45％,67.23％,and 49.15％,respectively.Shading measures arranged alone after the emergence of odor pollution might lead to algae deaths,resulting in deterioration of water quality.The total odor mass concentration of the July shading group N6 increased by about 1 times,and the average dissolved oxygen decreased by more than 56％.The odor concentration could still be reduced by aeration.The total odor mass concentration in the July shading and aeration group N4,the July aeration group N5 decreased by 39.27％and 38.36％,respectively.The results indicated that shading technology should be used as a prevention measure before the emergence of odor pollution,and the duration time should not exceed 2 months.Aeration technology could be used for prevention or emergency.
万方数据
维普
