A Natural Ecological Wastewater Treatment System （NEWTS） is usually built on natural terrain with necessary topography modification to improve water flowing route and pattern, and then the topography modified NEWTS ...A Natural Ecological Wastewater Treatment System （NEWTS） is usually built on natural terrain with necessary topography modification to improve water flowing route and pattern, and then the topography modified NEWTS should also have a reasonable water storage volume and hydraulic retention time so as to achieve the anticipated water purification effect. In this study, the dynamic mesh technique based on the finite element method and element storativity coefficients was presented to develop a two-dimensional hydrodynamic and water quality model, which was used to optimize the design of NEWTS under the dynamic land-water boundary due to various water storage volume. The models were employed in the optimized design of NEWTS from a large abandoned coal mine, which purifies the polluted water flowing into a large water storage lake, as part of the East Route South-to-North Water Transfer Project in China. Specifically, the natural topography modification scheme was presented, and further, a reasonable water storage volume and hydraulic residence time was obtained, based on the reasonable estimation of roughness coefficient and pollutant removal rate of the NEWTS with phragmites communis.展开更多
Widely application of CWs （Constructed Wetlands） in domestic wastewater treatment of China is developing wetlands into a multi-function wetland system. Wetland center in CAMIP （Changshu Advanced Materials Industria...Widely application of CWs （Constructed Wetlands） in domestic wastewater treatment of China is developing wetlands into a multi-function wetland system. Wetland center in CAMIP （Changshu Advanced Materials Industrial Park） （Suzhou, Jiangsu Province, China） successfully improved tail water quality to level IV of Environment Quality Standards for Surface Water （GB3838-2002） by the combination of different CW steps and achieved water reuse in CAMIP for industrial purpose. Different from traditional tail water advanced treatment, wetland center is designed under the principle of combining landscape and ecological treatment technology. Since this center started running, the removal rate of TN （Total Nitrogen）, NH3-N, TP （Total Phosphorus） and COD （Chemical Oxygen Demand） reaches 87%, 91%, 44% and 60% respectively. Also, 2,038,000 m^3 industrial water reuse in 2015 and 2016 was achieved; emission reduction on COD, NH3-N and TN reached 100 t, 7.2 t and 15.2 t; an ecological garden that combines ecological wastewater treatment, wetland landscape, habitat renovation and educational functions was created.展开更多
基金supported by the Key Program on the S and T for the Pollution Control and Treatment of Water Bodies (Grant Nos.2009ZX07210-008,2009ZX07316-005)the Science and Technology Commission of Shanghai Municipal People's Government (Grant No.072312050)
文摘A Natural Ecological Wastewater Treatment System （NEWTS） is usually built on natural terrain with necessary topography modification to improve water flowing route and pattern, and then the topography modified NEWTS should also have a reasonable water storage volume and hydraulic retention time so as to achieve the anticipated water purification effect. In this study, the dynamic mesh technique based on the finite element method and element storativity coefficients was presented to develop a two-dimensional hydrodynamic and water quality model, which was used to optimize the design of NEWTS under the dynamic land-water boundary due to various water storage volume. The models were employed in the optimized design of NEWTS from a large abandoned coal mine, which purifies the polluted water flowing into a large water storage lake, as part of the East Route South-to-North Water Transfer Project in China. Specifically, the natural topography modification scheme was presented, and further, a reasonable water storage volume and hydraulic residence time was obtained, based on the reasonable estimation of roughness coefficient and pollutant removal rate of the NEWTS with phragmites communis.
文摘Widely application of CWs （Constructed Wetlands） in domestic wastewater treatment of China is developing wetlands into a multi-function wetland system. Wetland center in CAMIP （Changshu Advanced Materials Industrial Park） （Suzhou, Jiangsu Province, China） successfully improved tail water quality to level IV of Environment Quality Standards for Surface Water （GB3838-2002） by the combination of different CW steps and achieved water reuse in CAMIP for industrial purpose. Different from traditional tail water advanced treatment, wetland center is designed under the principle of combining landscape and ecological treatment technology. Since this center started running, the removal rate of TN （Total Nitrogen）, NH3-N, TP （Total Phosphorus） and COD （Chemical Oxygen Demand） reaches 87%, 91%, 44% and 60% respectively. Also, 2,038,000 m^3 industrial water reuse in 2015 and 2016 was achieved; emission reduction on COD, NH3-N and TN reached 100 t, 7.2 t and 15.2 t; an ecological garden that combines ecological wastewater treatment, wetland landscape, habitat renovation and educational functions was created.
