Purification effect of initial surface runoff by water-collecting flower bed in rural areas
YAO Yidan1,2,3,, WEN Xuezheng1,2, ZHANG Yingying1,2,,, WANG Yan1,2, ZHANG Zhiyong1,2, QIN Hongjie1,2, ZHANG Jinhua3, LIU Haiqin1,2, SONG Xuefei1,2 1.Institute of Agricultural Resources and Environmental Sciences, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China 2.Key Laboratory at Yangtze River Plain for Agricultural Environment, Ministry of Agriculture, Nanjing 210014, China 3.School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
Abstract:Due to the ground hardening of rural residential areas, the initial surface runoff with high concentrations of nitrogen only directly discharges into the nearby watercourse and makes it pollution. In this study, a combined process of “water-collecting flower bed and intercepting ditch” was designed, and the purification effects of initial surface runoff by it under four different hydraulic retention times (HRT) were analyzed. The results showed that above combined process could effectively reduce the concentrations of pollutants in rural initial surface runoff through plant uptake, microbial degradation and substrate adsorption-interception. Under four different HRTs, this combined process could rapidly remove the suspended solids in runoff water with removal rate over 96%. At HRT of 3 h, this combined process could significantly reduce the concentrations of TN, TP and COD in the runoff water, and the corresponding the removal rates were above 90%, 90% and 75%, respectively. The TN and COD in effluent met the third level water standard of the surface water environment quality standard (GB 3838-2002), and TP in effluent met the fifth level water standard. The above study can provide technical reference and data support for initial surface runoff treatment in rural areas. Key words:initial surface runoff/ water-collecting flower bed/ water quality purification/ nitrogen/ phosphorus.
图1组合装置运行平面示意图 Figure1.Schematic diagram of combined device operation
LI L Q, YIN C Q, HEQ C, et al. First flush of storm runoff pollution from an urban catchment in China[J]. Journal of Environmental Science, 2007, 19(3): 295-299. doi: 10.1016/S1001-0742(07)60048-5
[2]
CHANG C H, WEN C G, CHI S L. Use of intercepted runoff depth for stormwater runoff management in industrial parks in Taiwan[J]. Water Resources Management, 2008, 22(11): 1609-1623. doi: 10.1007/s11269-008-9245-9
SCHULTZ R E, BOUCHARD V L, FREY S D. Overyielding and the role of complementary use of nitrogen in wetland plant communities[J]. Aquatic Botany, 2012, 97(1): 1-9. doi: 10.1016/j.aquabot.2011.10.002
[13]
CZERWIONKA K, MAKINIA J, PAGILLA K R, et al. Characteristics and fate of organic nitrogen in municipal biological nutrient removal wastewater treatment plants[J]. Water Research, 2012, 46(7): 2057-2066. doi: 10.1016/j.watres.2012.01.020
[14]
VYMAZAL J. Horizontal sub-surface flow and hybrid constructed wetlands systems for wastewater treatment[J]. Ecological Engineering, 2005, 25(5): 478-490. doi: 10.1016/j.ecoleng.2005.07.010
[15]
15]PERBANGKHEM T, PLOPRASERT C. Biomass production of papyrus (Cyperus papyrus) in constructed wetland treating low-strength domestic wastewater[J]. Bioresource Technology, 2010, 101(2): 833-835.
WEI B, YU X, ZHANG S, et al. Comparison of the community structures of ammonia-oxidizing bacteria and archaea in rhizoplanes of floating aquatic macrophytes[J]. Microbiology Research, 2011, 166: 468-474. doi: 10.1016/j.micres.2010.09.001
[18]
GAO Y, YI N, LIU X, et al. Effect of Eichhornia crassipes on production of N2 by denitrification in eutrophic water[J]. Ecological Engineering, 2014, 68: 14-24. doi: 10.1016/j.ecoleng.2014.01.002
[19]
HEALY M G, RODGERS M, MULQUEEN J. Treatment of dairy wastewater using constructed wetlands and intermittent sand filters[J]. Bioresource Technology, 2007, 98(12): 2268-2281. doi: 10.1016/j.biortech.2006.07.036
1.Institute of Agricultural Resources and Environmental Sciences, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China 2.Key Laboratory at Yangtze River Plain for Agricultural Environment, Ministry of Agriculture, Nanjing 210014, China 3.School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, China Received Date: 2019-09-17 Accepted Date: 2019-12-04 Available Online: 2020-03-02 Keywords:initial surface runoff/ water-collecting flower bed/ water quality purification/ nitrogen/ phosphorus Abstract:Due to the ground hardening of rural residential areas, the initial surface runoff with high concentrations of nitrogen only directly discharges into the nearby watercourse and makes it pollution. In this study, a combined process of “water-collecting flower bed and intercepting ditch” was designed, and the purification effects of initial surface runoff by it under four different hydraulic retention times (HRT) were analyzed. The results showed that above combined process could effectively reduce the concentrations of pollutants in rural initial surface runoff through plant uptake, microbial degradation and substrate adsorption-interception. Under four different HRTs, this combined process could rapidly remove the suspended solids in runoff water with removal rate over 96%. At HRT of 3 h, this combined process could significantly reduce the concentrations of TN, TP and COD in the runoff water, and the corresponding the removal rates were above 90%, 90% and 75%, respectively. The TN and COD in effluent met the third level water standard of the surface water environment quality standard (GB 3838-2002), and TP in effluent met the fifth level water standard. The above study can provide technical reference and data support for initial surface runoff treatment in rural areas.
下载: 
点击查看大图
