灼烧净水污泥投加方式对磷吸附和磷形态的影响
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摘要
以灼烧净水污泥为研究对象,探讨在其不同投加方式(混匀和覆盖)下,各底泥对外源磷的吸附效果以及间隙水和底泥中各形态磷的数量分布.结果表明,相比未灼烧净水污泥,灼烧净水污泥对磷的吸附能力显著改善,磷最大吸附量(Smax)提高了43.7%、底泥磷平衡浓度(EPC0)降低69.1%、磷饱和度(DPS)降低54.4%.混匀和覆盖对上覆水中磷消失的贡献率几乎一致,但明显高于对照实验.但如果考虑灼烧净水污泥与上覆水的接触几率,则混匀条件下,单位净水污泥对磷的吸附量为覆盖条件下的2.3倍.覆盖条件下,间隙水(1~2 cm)中溶解性磷酸盐浓度是混匀条件的33.17倍(平均值),这主要源于覆盖导致溶解氧渗透深度明显降低.混匀条件下,外源磷更易形成Ca-P,而覆盖条件下,易释放的NH_4Cl-P和Fe/Al-P占比更多,这暗示了混匀对底泥微环境的改造更有利于外源磷的吸附和内源磷的持留.
The adsorption of external phosphorus(P) and the distribution of dissolved inorganic P(DIP) in the sediment interstitial water and sedimentary P forms were researched under the ignited water purification sludge(IWPS) addition(mixing and capping).The results showed that the adsorption ability of the IWPS increased obviously,compared with the water purification sludge(WPS). It indicated that the Smaxincreased by 43. 7%,the EPC0 decreased by 69. 1% and the DPS decreased by 54. 4%. The contribution of P disappearance in the overlying water had almost no difference between the mixing and capping with IWPS,but it was obviously higher than the control in both cases. Under the mixing condition,the adsorption of external P by unit IWPS was 2. 3 times of that under the capping condition,if the contacting probability between the IWPS and the overlying water was considered. Under the capping condition,the DIP in the sediment interstitial water(1-2 cm) was 33. 17 times(average) of that under the mixing condition. It was attributed to the decrease of the dissolved oxygen penetration due to capping. Under the mixing condition,the external P tended to form Ca-P,while the percentages of NH4Cl-P and Fe/Al-P to Tot-P were bigger under the capping condition. It was suggested that the improvement of the sedimentary microenvironment by mixing with the IWPS was favorable for the adsorption of the external P and the immobilization of the internal P.
The adsorption of external phosphorus(P) and the distribution of dissolved inorganic P(DIP) in the sediment interstitial water and sedimentary P forms were researched under the ignited water purification sludge(IWPS) addition(mixing and capping).The results showed that the adsorption ability of the IWPS increased obviously,compared with the water purification sludge(WPS). It indicated that the Smaxincreased by 43. 7%,the EPC0 decreased by 69. 1% and the DPS decreased by 54. 4%. The contribution of P disappearance in the overlying water had almost no difference between the mixing and capping with IWPS,but it was obviously higher than the control in both cases. Under the mixing condition,the adsorption of external P by unit IWPS was 2. 3 times of that under the capping condition,if the contacting probability between the IWPS and the overlying water was considered. Under the capping condition,the DIP in the sediment interstitial water(1-2 cm) was 33. 17 times(average) of that under the mixing condition. It was attributed to the decrease of the dissolved oxygen penetration due to capping. Under the mixing condition,the external P tended to form Ca-P,while the percentages of NH4Cl-P and Fe/Al-P to Tot-P were bigger under the capping condition. It was suggested that the improvement of the sedimentary microenvironment by mixing with the IWPS was favorable for the adsorption of the external P and the immobilization of the internal P.
引文
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[3]Chau K W,Jin H S.Two-layered,2D unsteady eutrophication model in boundary-fitted coordinate system[J].Marine Pollution Bulletin,2002,45(1-12):300-310.
[4]Kim L H,Choi E,Stenstrom M K.Sediment characteristics,phosphorus types and phosphorus release rates between river and lake sediments[J].Chemosphere,2003,50(1):53-61.
[5]秦伯强,杨柳燕,陈非洲,等.湖泊富营养化发生机制与控制技术及其应用[J].科学通报,2006,51(16):1857-1866.Qin B Q,Yang L Y,Chen F Z,et al.Mechanism and control of lake eutrophication[J].Chinese Science Bulletin,2006,51(19):2401-2412.
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[7]胡小贞,金相灿,卢少勇,等.湖泊底泥污染控制技术及其适用性探讨[J].中国工程科学,2009,11(9):28-33.Hu X Z,Jin X C,Lu S Y,et al.Techniques for sediment pollution control and discussion on the applicability in lakes of China[J].Engineering Science,2009,11(9):28-33.
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[11]丁艳青,朱广伟,秦伯强,等.波浪扰动对太湖底泥磷释放影响模拟[J].水科学进展,2011,22(2):273-278.Ding Y Q,Zhu G W,Qin B Q,et al.Experimental study on the effect of wave disturbances on the phosphorus dynamics in shallow lakes[J].Advances in Water Science,2011,22(2):273-278.
[12]张亚雷,章明,李建华,等.Ca O2不同投加方式对底泥磷释放的抑制效果分析[J].环境科学,2006,27(11):2188-2193.Zhang Y L,Zhang M,Li J H,et al.Effect on different adding means of calcium peroxide to control phosphorus release from sediment[J].Environmental Science,2006,27(11):2188-2193.
[13]帖靖玺,赵莉,张仙娥.净水厂污泥的磷吸附特性研究[J].环境科学与技术,2009,32(6):149-151,164.Tie J X,Zhao L,Zhang X E.Phosphorus adsorption characteristics of waterworks sludge[J].Environmental Science&Technology,2009,32(6):149-151,164.
[14]方晖,张易培,陈丁丁,等.净水厂聚合氯化铝铁污泥对污水中磷的吸附作用[J].工业用水与废水,2013,44(3):17-20.Fang H,Zhang Y P,Chen D D,et al.Adsorption performance of PAFC sludge from water purification plant on phosphorus in sewage[J].Industrial Water&Wastewater,2013,44(3):17-20.
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[18]黄华山,杨志敏,周真明,等.净水厂污泥覆盖控制底泥氮磷释放效果[J].华侨大学学报(自然科学版),2016,37(3):347-351.Huang H S,Yang Z M,Zhou Z M,et al.Efficiency of controlling nitrogen and phosphorus release from sediment using thin-layer capping with water treatment plant sludge[J].Journal of Huaqiao University(Natural Science),2016,37(3):347-351.
[19]祝成成,王涌涛,李大鹏.净水污泥制备陶粒及其对废水中磷酸盐的吸附试验研究[J].苏州科技学院学报(工程技术版),2011,24(4):12-17.Zhu C C,Wang Y T,Li D P.Adsorption of phosphate from wastewater by ceramists from purified water's sludge[J].Journal of University of Science and Technology of Suzhou(Engineering and Technology),2011,24(4):12-17.
[20]刘丽娜,孔海南,吴德意,等.苏州河底泥中重金属的烧结无害化研究[J].中国环境科学,2006,26(5):524-527.Liu L N,Kong H N,Wu D Y,et al.Studies on the detoxification of heavy metals by calcinations in Suzhou River sediment[J].China Environmental Science,2006,26(5):524-527.
[21]李大鹏,句立展,黄勇,等.灼烧对河道底泥中磷迁移转化特性的影响[J].中国给水排水,2008,24(11):89-92.Li D P,Ju L Z,Huang Y,et al.Influence of ignition on migration and transformation of phosphorus in river sediments[J].China Water&Wastewater,2008,24(11):89-92.
[22]李大鹏,黄勇,李伟光.底泥预处理对磷等温吸附特征及磷形态的影响[J].中国环境科学,2007,27(3):346-351.Li D P,Huang Y,Li W G.Influence of different sediments pretreatment on phosphorus adsorption characteristics and phosphorus forms[J].China Environmental Science,2007,27(3):346-351.
[23]Pan G,Krom M D,Herut B.Adsorption-desorption of phosphate on airborne dust and riverborne particulates in East Mediterranean seawater[J].Environmental Science&Technology,2002,36(16):3519-3524.
[24]朱广伟,秦伯强,高光,等.灼烧对沉积物烧失量及铁、磷测定的影响[J].分析试验室,2004,23(9):72-76.Zhu G W,Qing B Q,Gao G,et al.Effects of ignition on determination of loss on ignition,iron and phosphorus in sediments[J].Chinese Journal of Analysis Laboratory,2004,23(9):72-76.
[25]Kim L H,Choi E,Gil K I,et al.Phosphorus release rates from sediments and pollutant characteristics in Han River,Seoul,Korea[J].Science of the Total Environment,2004,321(1-3):115-125.
[26]周光红.几种固体废弃物吸附除磷性能及其机理探讨[D].大连:大连理工大学,2011.29-30.Zhou G H.Study of the performance and mechanism of phosphorus adsorption with solid waste[D].Dalian:Dalian University of Technology,2011.29-30.
[27]李佳,林建伟,詹艳慧.镧改性沸石活性覆盖控制重污染河道底泥溶解性磷酸盐和铵释放研究[J].环境科学,2013,34(11):4266-4274.Li J,Lin J W,Zhan Y H.Evaluation of in situ capping with lanthanum-modified zeolite to control phosphate and ammonium release from sediments in heavily polluted river[J].Environmental Science,2013,34(11):4266-4274.
[28]王忍,李勇,李大鹏,等.河蚬或藻存在下组合扰动对内源磷迁移的影响[J].中国环境科学,2016,36(4):1226-1234.Wang R,Li Y,Li D P,et al.Impacts of corbicula fluminea or algae under combined disturbance on internal phosphorus migration[J].China Environmental Science,2016,36(4):1226-1234.
[29]雒文生,李莉红,贺涛.水体大气复氧理论和复氧系数研究进展与展望[J].水利学报,2003,34(11):64-70.Luo W S,Li L H,He T.Advances and prospects in the research of water reaeration theory and reaeration coefficient[J].Journal of Hydraulic Engineering,2003,34(11):64-70.
[30]程香菊,陈永灿,袁丽蓉,等.水体大气复氧能力研究综述[J].科技导报,2008,26(17):11.Cheng X J,Chen Y C,Yuan L R,et al.Review of research on reaeration ability in water-body[J].Science&Technology Review,2008,26(17):11.
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