Abstract:According to physical and chemical indexes of sediment, such as color, odor, particle size and viscosity, column sediments of Zhushan Bay were divided into oxide layer(A), polluted layer(B), upper polluted transition layer(C1), lower polluted transition layer(C2)and healthy mud layer(D) from top to bottom. To calculate the environmental dredging layer and depth of Zhushan Bay, vertical distributions of ammonia nitrogen(NH4+-N), total phosphorus(TP), total nitrogen(TN) and loss of ignition(LOI) were analyzed.Nitrogen and phosphorus adsorption/desorption experiments about every layer were also conducted. Concentrations of NH4+-N, TP, TN and LOI decreased with depths, and concentrations of contaminants in layer A and layer B were significantly higher than those in other layers. Adsorption/desorption equilibrium concentrations of inorganic phosphorus(IP) in sediment decreased with depths, and there was an inflection point between C1 layer and C2 layer. Changes of adsorption/desorption equilibrium concentrations of NH4+-N with depths were complex. Combined with concentrations of IP and NH4+-N in overlying water, environmental dredging (env-dredging) layer of Zhushan Bay was layer C1 and environmental dredging depth range from 0.4 to 0.7m.
王雯雯, 姜霞, 王书航, 金相灿. 太湖竺山湾污染底泥环保疏浚深度的推算[J]. 中国环境科学, 2011, 31(6): 1013-1018.
WANG Wen-Wen, JIANG Xia, WANG Shu-Hang, JIN Xiang-Can. Calculation of environmental dredging depth of contaminated sediments in Zhushan Bay of Taihu Lake. CHINA ENVIRONMENTAL SCIENCECE, 2011, 31(6): 1013-1018.