改良填料生物滞留池对雨水径流中磷的去除效果
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摘要
针对生物滞留池在一定淹没区高度条件下同时添加碳源对P的去除效果波动较大问题,开展了生物滞留池填料改良方法的研究。通过构建3根模拟实验柱,分别填充传统填料、普通生物炭改良填料和铁改性生物炭改良填料,分析了不同生物炭改良填料生物滞留池在不同淹没区高度和不同落干期条件下对PO_4~(3-)-P的去除效果;同时,探讨了生物炭对生物滞留池填料的改良作用。研究结果表明:在淹没区高度为300 mm的条件下,铁改性生物炭改良填料生物滞留池对于PO_4~(3-)-P去除效果最好,平均去除率接近90%,而普通生物炭改良填料生物滞留池对PO_4~(3-)-P去除效果最差,平均去除率低于60%;同时,在不同落干期条件下,所有实验柱均未发生PO_4~(3-)-P淋出现象。铁改性生物炭改良填料生物滞留池在设有一定高度淹没区条件下对雨水径流中磷具有很好的去除效果,并对不同落干期变化具有较强的适应性。
Aiming at the problem that phosphorus(P) removal effect fluctuates greatly with the addition of carbon source at a certain height of submerged zone in a bioretention tank, the improvement method of its media was investigated. In this study, three simulated experimental columns were constructed and filled with conventional media, general biochar-improved media, and iron-coated biochar-improved media, respectively.PO_4~(3-)-P removal effects of the bioretention cells with different biochar-improved media at different submerged heights and drying periods were analyzed, and the improvement effect of biochar on media was PO_4~(3-)effect at the submerged height of 300 mm in the bioretention tank, and the corresponding average removal efficiency approached 90%. However, the general biochar-improved media presented the lowest PO_4~(3-)PO_4~(3-)from media did not occur in all the experimental columns. In conclusion, the bioretention tank filled with the iron-coated biochar-improved media had a good performance on phosphorus removal from rain runoff and a strong adaptability to different drying periods when a submerged zone with certain height was preset.
Aiming at the problem that phosphorus(P) removal effect fluctuates greatly with the addition of carbon source at a certain height of submerged zone in a bioretention tank, the improvement method of its media was investigated. In this study, three simulated experimental columns were constructed and filled with conventional media, general biochar-improved media, and iron-coated biochar-improved media, respectively.PO_4~(3-)-P removal effects of the bioretention cells with different biochar-improved media at different submerged heights and drying periods were analyzed, and the improvement effect of biochar on media was PO_4~(3-)effect at the submerged height of 300 mm in the bioretention tank, and the corresponding average removal efficiency approached 90%. However, the general biochar-improved media presented the lowest PO_4~(3-)PO_4~(3-)from media did not occur in all the experimental columns. In conclusion, the bioretention tank filled with the iron-coated biochar-improved media had a good performance on phosphorus removal from rain runoff and a strong adaptability to different drying periods when a submerged zone with certain height was preset.
引文
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[2]LIU J,DAVIS A P.Phosphorus speciation and treatment using enhanced phosphorus removal bioretention[J].Environmental Science&Technology,2014,48:607-614.
[3]HUNT W F,DAVIS A P G R.Meeting hydrologic and water quality goals through targeted bioretention design[J].Journal of Environmental Engineering,2012,138(6):698-707.
[4]LI J,DAVIS A P.A unified look at phosphorus treatment using bioretention[J].Water Research,2016,90:141-155.
[5]DAVIS A P,HUNT W F,TRAVER R G,et al.Bioretention technology:overview of current practice and future needs[J].Journal of Environmental Engineering,2009,135(3):109-117.
[6]ERICKSON A J,GULLIVER J S,WEISS P T.Enhanced sand filtration for storm water phosphorus removal[J].Journal of Environmental Engineering,2007,133(5):485-497.
[7]DAVIS A P,SHOKOUHIAN M,SHARMA H,et al.Laboratory study of biological retention for urban stormwater management[J].Water Environment Research,2001,73(1):5-14.
[8]YAN Q,DAVIS A P,JAMES B R.Enhanced organic phosphorus sorption from urban stormwater using modified bioretention media:batch studies[J].Journal of Environmental Engineering,2016,142(4):1-11.
[9]RICHARDSON J L,VEPRASKAS M J.Wetland Soils[M].London,UK:CRC Press LLC,2001.
[10]TIAN J,JIN J,CHIU P C,et al.A pilot-scale,bi-layer bioretention system with biochar and zerovalent iron for enhancednitrate removal from stormwater[J].Water Research,2019,148:378-387.
[11]TIAN J,MILLER V,CHIU P C,et al.Nutrient release and ammonium sorption by poultry litter and wood biochars in stormwater treatment[J].Science of the Total Environment,2016,553:596-606.
[12]许萍,黄俊杰,张建强,等.模拟生物滞留池强化径流雨水中的氮磷去除研究[J].环境科学与技术,2017,40(2):107-112.
[13]LI J,LV G,BAII W,et al.Modification and use of biochar from wheat straw(triticum aestivum l.)for nitrate and phosphate removal from water[J].Desalination and Water Treatment,2014,57(10):1-13.
[14]ZHANG M,GAO B,YAO Y,et al.Synthesis of porous mgo-biochar nanocomposites for removal of phosphate and nitrate from aqueous solutions[J].Chemical Engineering Journal,2012,210:26-32.
[15]NCDWQ.Chapter 12:Bioretention.Stormwater Best Management Practices Manual[M].Raleigh:N.C.Department of Environmental and Natural Resources,Divison of Water Quality,2007:12-13.
[16]田婧.生物炭对生物滞留池水文效应和氮素去除影响的研究[D].成都:西南交通大学,2016.
[17]陈莹,赵剑强,胡博,等.西安市城市主干道路面径流污染负荷研究[J].安全与环境学报,2011,11(4):112-117.
[18]袁宏林,陈海清,林原,等.西安市降雨水质变化规律分析[J].西安建筑科技大学学报(自然科学版),2011,43(3):391-395.
[19]TAN K H.Sample preparation[M]//TAN K H.Soil Sampling,Preparation,and Analysis.USA:Chapman and Hall/CRC,2005.
[20]中华人民共和国环境保护部.土壤有效磷的测定碳酸氢钠浸提-钼锑抗分光光度法[M].北京:中国环境科学出版社,2014.
[21]TAN K H.Cation exchange capacity and base saturation determination[M]//Soil Sampling,Preparation,and Analysis.USA:Chapman and Hall/CRC,2005.
[22]BALDWIN D S,MITCHELL A M.The effects of drying and re-flooding on the sediment and soil nutrient dynamics of lowland river-floodplain systems:A synthesis[J].Regulated Revers:Research&Management,2000,16:457-467.
[23]CLAUSEN M,JOHNC D.Saturation to improve pollutant retention in a rain garden[J].Environmental Science&Technology,2006,40(4):1335-1340.
[24]CORRELL D L.Phosphorus:A rate limiting nutrient in surface waters[J].Poultry Science,1999,78:674-682.
[25]BOHN H L,MCNEAL B L,O'CONNOR G A.Soil Chemistry[M].3rd Edition.New York:John Wiley&Sons,Ins.,2001.
[26]DAVIS A P,SHOKOUHIAN M,SHARMA H,et al.Water quality improvement through bioretention media:Nitrogen and phosphorus removal[J].Water Environment Research,2006,78(3):284-293.