磁性铁锆改性沸石覆盖对河道底泥磷释放的控制效果
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摘要
通过批量吸附实验考察磁性铁锆改性沸石对水中磷酸盐的去除性能,再通过底泥培养实验考察磁性铁锆改性沸石覆盖对河道底泥磷释放的控制效果。结果表明:磁性铁锆改性沸石对水中磷酸盐的吸附能力良好。无论是在自然状态下,还是在缺氧控制状态下,河道底泥均向上覆水体中释放出一定数量的溶解性活性磷(SRP),而磁性铁锆改性沸石覆盖可以有效控制河道底泥中磷的释放,使得上覆水体中SRP浓度处于非常低的水平(0. 007～0. 031 mg/L)。当覆盖层受到破坏并使覆盖材料与表层底泥混合之后,磁性铁锆改性沸石仍然可以极大地降低上覆水体中SRP浓度,并且使底泥中潜在可移动态磷向较为稳定和非常稳定的磷形态转变,以及促使底泥中生物可利用性磷向非生物可利用性磷转变,使得底泥中磷发生释放的风险降低。以上结果初步表明,磁性铁锆改性沸石是一种非常有希望用于控制河道底泥中磷释放的覆盖材料。
The performance of phosphate removal by magnetic iron/zirconium-modified zeolite( FeZrZeo)using batch experiments and the efficiency of sediment capping with FeZrZeo to control phosphorus( P)release from river sediments were tested using incubation experiments. The results showed that the as-prepared FeZrZeo exhibited a high phosphate adsorption capacity. P in river sediments could be released into the overlying water under natural and anoxic conditions. However,sediment capping with FeZrZeo can greatly reduce the releasing flux of SRP from the sediment to the overlying water,resulting in a very low level of SRP in the overlying water( 0. 007-0. 031 mg/L). When FeZrZeo-based barrier layer was destroyed,the mixing of FeZrZeo with sediment not only led to the reduction of SRP concentration in the overlying water,but also resulted in the transformation of the mobile P( sum of the NH_4Cl extractable P( NH_4Cl-P) and Na_2S_2O_4/NaHCO_3 extractable P( BD-P)) to the more stable phosphorus such as the NaOH extractable P( NaOH-rP)and residual P( Res-P). Furthermore,the mixing of FeZrZeo with sediment led to the transformation of bioavailable P including anion resin extractable P( Resin-P),water soluble P( WSP),readily desorbable P( RDP),NaOH extractable P( AAP) and NaHCO_3 extractable P( Olsen-P) to the non-bioavailable P in the sediment,resulting in the decrease in the P bioavaiability of the sedidment. Results of this study show that FeZrZeo is a promising capping material for the control of SRP release from river sediments.
The performance of phosphate removal by magnetic iron/zirconium-modified zeolite( FeZrZeo)using batch experiments and the efficiency of sediment capping with FeZrZeo to control phosphorus( P)release from river sediments were tested using incubation experiments. The results showed that the as-prepared FeZrZeo exhibited a high phosphate adsorption capacity. P in river sediments could be released into the overlying water under natural and anoxic conditions. However,sediment capping with FeZrZeo can greatly reduce the releasing flux of SRP from the sediment to the overlying water,resulting in a very low level of SRP in the overlying water( 0. 007-0. 031 mg/L). When FeZrZeo-based barrier layer was destroyed,the mixing of FeZrZeo with sediment not only led to the reduction of SRP concentration in the overlying water,but also resulted in the transformation of the mobile P( sum of the NH_4Cl extractable P( NH_4Cl-P) and Na_2S_2O_4/NaHCO_3 extractable P( BD-P)) to the more stable phosphorus such as the NaOH extractable P( NaOH-rP)and residual P( Res-P). Furthermore,the mixing of FeZrZeo with sediment led to the transformation of bioavailable P including anion resin extractable P( Resin-P),water soluble P( WSP),readily desorbable P( RDP),NaOH extractable P( AAP) and NaHCO_3 extractable P( Olsen-P) to the non-bioavailable P in the sediment,resulting in the decrease in the P bioavaiability of the sedidment. Results of this study show that FeZrZeo is a promising capping material for the control of SRP release from river sediments.
引文
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[35]LIU Q,DING S M,CHEN X,et al.Effects of temperature on phosphorus mobilization in sediments in microcosm experiment and in the field[J].Applied Geochemistry,2018,88:158-166.
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[2]孙玉平,于恒国,周钦,等.典型富营养化城市河流---浙江温瑞塘河的浮游植物群落类型与季节变化[J].湖泊科学,2018,30(2):375-384.SUN Y P,YU H G,ZHOU Q,et al.Seasonal variation of phytoplankton communities in Wenruitang River-A typical eutrophic urban river,Zhejiang Province[J].Journal of Lake Sciences,2018,30(2):375-384.
[3]赵建国,李洪波,刘存歧,等.永定河怀来段水体富营养化评价[J].环境工程技术学报,2018,8(3):248-256.ZHAO J G,LI H B,LIU C Q,et al.Evaluation of eutrophication of water body in Huailai section of Yongding River[J].Journal of Environmental Engineering Technology,2018,8(3):248-256.
[4]YU J H,DING S M,ZHONG J C,et al.Evaluation of simulated dredging to control internal phosphorus release from sediments:focused on phosphorus transfer and resupply across the sediment-water interface[J].Science of the Total Environment,2017,592:662-673.
[5]谢丹平,李开明,江栋,等.底泥修复对城市污染河道水体污染修复的影响研究[J].环境工程学报,2009,3(8):1447-1453.XIE D P,LI K M,JIANG D,et al.Study on effect of polluted sediments bioremediation on water body remediation of polluted urban rivers[J].Chinese Journal of Environmental Engineering,2009,3(8):1447-1453.
[6]丁帅,王圣瑞,张蕊,等.滇池水生植物分布对沉积物间隙水磷浓度的影响[J].环境科学,2016,37(10):3828-3834.DING S,WANG S R,ZHANG R,et al.Concentration of phosphorus in sediments interstitial water as affected by distribution of aquatic plants in Dianchi Lake[J].Environmental Science,2016,37(10):3828-3834.
[7]ZHU T S,CAO T,NI L Y,et al.Improvement of water quality by sediment capping and re-vegetation with Vallisneria natans L.:a short-term investigation using an in situ enclosure experiment in Lake Erhai,China[J].Ecological Engineering,2016,86:113-119.
[8]AKHURST D,JONES G B,MCCONCHIE D M.The application of sediment capping agents on phosphorus speciation and mobility in a sub-tropical dunal lake[J].Marine and Freshwater Research,2004,55(7):715-725.
[9]WAAJEN G,VAN OOSTERHOUT F,DOUGLAS G,et al.Geo-engineering experiments in two urban ponds to control eutrophication[J].Water Research,2016,97:69-82.
[10]GIBBS M,ZKUNDAKCI D.Effects of a modified zeolite on P and N processes and fluxes across the lake sedimentwater interface using core incubations[J].Hydrobiologia,2011,661(1):21-35.
[11]LI Y W,FAN Y,LI X D,et al.Evaluation of zeolite/hydrous aluminum oxide as a sediment capping agent to reduce nutrients level in a pond[J].Ecological Engineering,2017,101:170-178.
[12]LIN J W,ZHAN Y H,ZHU Z L.Evaluation of sediment capping with active barrier systems(ABS)using calcite/zeolite mixtures to simultaneously manage phosphorus and ammonium release[J].Science of the Total Environment,2011,409(3):638-646.
[13]PAN G,DAI L C,LI L,et al.Reducing the recruitment of sedimented algae and nutrient release into the overlying water using modified soil/sand flocculation-capping in eutrophic lakes[J].Environmental Science&Technology,2012,46(9):5077-5084.
[14]WANG C H,GAO S J,Pei Y S,et al.Use of drinking water treatment residuals to control the internal phosphorus loading from lake sediments:laboratory scale investigation[J].Chemical Engineering Journal,2013,225:93-99.
[15]YIN H B,KONG M.Reduction of sediment internal P-loading from eutrophic lakes using thermally modified calcium-rich attapulgite-based thin-layer cap[J].Journal of Environmental Management,2015,151:178-185.
[16]章喆,林建伟,詹艳慧,等.锆改性高岭土覆盖对底泥与上覆水之间磷迁移转化的影响[J].环境科学,2016,37(4):1427-1436.ZHANG Z,LIN J W,ZHAN Y H,et al.Effect of zirconium modified kaolin-based cap on migration and transformation of phosphorus between sediment and overlying water[J].Environmental Science,2016,37(4):1427-1436.
[17]杨孟娟,林建伟,詹艳慧,等.锆改性沸石活性覆盖控制重污染河道底泥氮磷释放研究[J].农业环境科学学报,2013,32(12):2460-2470.YANG M J,LIN J W,ZHAN Y H,et al.Releases of ammonium and phosphorus from river sediments capped with zirconium-modified zeolite[J].Journal of Agro-Environment Science,2013,32(12):2460-2470.
[18]FAN Y,LI Y W,WU D Y,et al.Application of zeolite/hydrous zirconia composite as a novel sediment capping material to immobilize phosphorus[J].Water Research,2017,123:1-11.
[19]ZAMPARAS M,ZACHARIAS I.Restoration of eutrophic freshwater by managing internal nutrient loads.A review[J].Science of the Total Environment,2014,496:551-562.
[20]FUNES A,DEL ARCO A,LVAREZ-MANZANEDA I,et al.A microcosm experiment to determine the consequences of magnetic microparticles application on water quality and sediment phosphorus pools[J].Science of the Total Environment,2017,579:245-253.
[21]FUNES A,DE VICENTE J,CRUZ-PIZARRO L,et al.Magnetic microparticles as a new tool for lake restoration:a microcosm experiment for evaluating the impact on phosphorus fluxes and sedimentary phosphorus pools[J].Water Research,2016,89:366-374.
[22]RASHID M,PRICE N T,PINILLA MG,et al.Effective removal of phosphate from aqueous solution using humic acid coated magnetite nanoparticles[J].Water Research,2017,123:353-360.
[23]李佳,詹艳慧,林建伟,等.锆-Fe3O4-沸石复合材料对水中磷酸盐和铵的吸附作用[J].水处理技术,2013,39(12):56-62.LI J,ZHAN Y H,LIN J W,et al.Removal of phosphate and ammonium from aqueous solution by using zirconium/magnetite/zeolite composite as adsorbent[J].Technology of Water Treatment,2013,39(12):56-62.
[24]RYDIN E.Potentially mobile phosphorus in Lake Erken sediment[J].Water Research,2000,34(7):2037-2042.
[25]WANG C H,BAI L L,JIANG H L,et al.Algal bloom sedimentation induces variable control of lake eutrophication by phosphorus inactivating agents[J].Science of the Total Environment,2016,557-558:479-488.
[26]何思琪,张薇,林建伟,等.锆改性沸石添加对重污染河道底泥磷释放和钝化的影响[J].环境科学,2018,39(9):4179-4188.HE S Q,ZHANG W,LIN J W,et al.Effect of zirconiummodified zeolite addition on phosphorus release and immobilization in heavily polluted river sediment[J].Environmental Science,2018,39(9):4179-4188.
[27]WANG C H,HE R,WU Y,et al.Bioavailable phosphorus(P)reduction is less than mobile P immobilization in lake sediment for eutrophication control by inactivating agents[J].Water Research,2017,109:196-206.
[28]LU D,GUO P Y,JI J F,et al.Evaluation of phosphorus distribution and bioavailability in sediments of a subtropical wetland reserve in southeast China[J].Ecological Indicators,2016,66:556-563.
[29]DING L,WU C,DENG H P,et al.Adsorptive characteristics of phosphate from aqueous solutions by MIEX resin[J].Journal of Colloid and Interface Science,2012,376(1):224-232.
[30]ASHEKUZZAMAN S M,JIANG J Q.Study on the sorptiondesorption-regeneration performance of Ca-,Mg-and CaMgbased layered double hydroxides for removing phosphate from water[J].Chemical Engineering Journal,2014,246:97-105.
[31]CHEN M S,DING S M,CHEN X,et al.Mechanisms driving phosphorus release during algal blooms based on hourly changes in iron and phosphorus concentrations in sediments[J].Water Research,2018,133:153-164.
[32]龚梦丹,金增锋,王燕,等.长江中下游典型浅水湖泊沉积物水界面磷与铁的耦合关系[J].湖泊科学,2017,29(5):1103-1111.GONG M D,JIN Z F,WANG Y,et al.Coupling between iron and phosphorus in sediments of shallow lakes in the middle and lower reaches of Yangtze River using diffusive gradients in thin films(DGT)[J].Journal of Lake Sciences,2017,29(5):1103-1111.
[33]KANG M X,PENG S,TIAN Y M,et al.Effects of dissolved oxygen and nutrient loading on phosphorus fluxes at the sediment-water interface in the Hai River Estuary,China[J].Marine Pollution Bulletin,2018,130:132-139.
[34]曹琳,吉芳英,林茂,等.有机质对三峡库区消落区沉积物磷释放的影响[J].环境科学研究,2011,24(2):185-190.CAO L,JI F Y,LIN M,et al.Impact of organic matter on phosphorous release in sediments from the fluctuating zone of Three Gorges reservoir area[J].Research of Environmental Sciences,2011,24(2):185-190.
[35]LIU Q,DING S M,CHEN X,et al.Effects of temperature on phosphorus mobilization in sediments in microcosm experiment and in the field[J].Applied Geochemistry,2018,88:158-166.
[36]ZILIUS M,GIORDANI G,PETKUVIENE J,et al.Phosphorus mobility under short-term anoxic conditions in two shallow eutrophic coastal systems(Curonian and Sacca di Goro lagoons)[J].Estuarine,Coastal and Shelf Science,2015,164:134-146.
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