改性牡蛎壳对低磷浓度水体的净化性能研究
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摘要
为寻求经济、高效的生态浮床除磷基质,以牡蛎壳为对象,通过等温吸附、吸附动力学和吸附剂投加量影响实验对比研究了经不同温度热处理的改性牡蛎壳对低磷浓度水体的吸附性能。结果表明:相比Langmuir方程,Freundlich方程能更好地模拟天然及改性牡蛎壳对总磷的等温吸附行为;相对于伪一级动力学和Elovich方程,牡蛎壳对总磷的吸附动力学过程与伪二级动力学方程更为吻合。热处理温度对总磷的吸附效果产生明显影响,650℃改性牡蛎壳的吸附性能最优。牡蛎壳投加量对总磷去除效果影响也较为显著,当投加量增至20g/L时,天然牡蛎壳、250℃改性牡蛎壳、500℃改性牡蛎壳、650℃改性牡蛎壳的总磷去除率分别可达到51.27%、62.50%、88.27%和99.69%。当投加量为8g/L时,650℃改性牡蛎壳对总磷的去除率已高达90%左右。总体而言,650℃改性牡蛎壳的总磷吸附效果最好,可优先选为生态浮床除磷基质。
Oyster shell was modified via oxygen-limited heating treatment to improve its TP adsorption effeciency for use as a substrate of ecological floating bed.Isothermal adsorption and kinetic experiments were conducted to compare the adsorption performances of the modified oyster shells.The effect of adsorbent dosing on TP removal performance was also studied.The results showed that Freundlich model was better to predict the isothermal experimental data for raw oyster shell and the modified oyster shells than Langmuir model.The pseudo-secondary kinetic model could better simulate the adsorption kinetic data than the pseudo-first kinetic model and Elovich model as well.The heating treatment temperature was found to have a significant effect on the ability for TP removal,and the 650℃-treated oyster shell showed the best performance.The effect of oyster shell dosage on TP removal was also significant.With the increase of the adsorbent dosage to 20 g/L,TP removal efficiency for the raw oyster shell,250℃-treated oyster shell,500 ℃-treated oyster shell and 650 ℃-treated oyster shell could reach 51.27%,62.50%,88.27% and 99.69%,respectively.When the adsorbent dosing was 8 g/L,the removal efficiency of 650 ℃-treated oyster shell had reached to 90%.Thus,650℃-treated oyster shell could be chosen as the most preferred substrate for ecological floating raft.
Oyster shell was modified via oxygen-limited heating treatment to improve its TP adsorption effeciency for use as a substrate of ecological floating bed.Isothermal adsorption and kinetic experiments were conducted to compare the adsorption performances of the modified oyster shells.The effect of adsorbent dosing on TP removal performance was also studied.The results showed that Freundlich model was better to predict the isothermal experimental data for raw oyster shell and the modified oyster shells than Langmuir model.The pseudo-secondary kinetic model could better simulate the adsorption kinetic data than the pseudo-first kinetic model and Elovich model as well.The heating treatment temperature was found to have a significant effect on the ability for TP removal,and the 650℃-treated oyster shell showed the best performance.The effect of oyster shell dosage on TP removal was also significant.With the increase of the adsorbent dosage to 20 g/L,TP removal efficiency for the raw oyster shell,250℃-treated oyster shell,500 ℃-treated oyster shell and 650 ℃-treated oyster shell could reach 51.27%,62.50%,88.27% and 99.69%,respectively.When the adsorbent dosing was 8 g/L,the removal efficiency of 650 ℃-treated oyster shell had reached to 90%.Thus,650℃-treated oyster shell could be chosen as the most preferred substrate for ecological floating raft.
引文
[1]李文鹏.改性牡蛎壳除磷吸附剂制备及其除磷性能研究[D].大连:大连理工大学,2014.
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[7]AGRAWAL S G,KING K W,FISCHER E N,et al.PO3-4removal by and permeability of industrial byproducts and minerals:granulated blast furnace slag,cement kiln dust,coconut shell activated carbon,silica sand,and zeolite[J].Water,Air,&Soil Pollution,2011,219(1/2/3/4):91-101.
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[14]AWUAL M R,JYO A,IHARA T,et al.Enhanced trace phosphate removal from water by zirconium(Ⅳ)loaded fibrous adsorbent[J].Water Research,2011,45(15):4592-4600.
[15]李林锋,吴小凤.天然牡蛎壳对磷吸附特性实验研究[J].三峡环境与生态,2011,33(6):1-4.
[16]赵娟,杨耐德,周亮.牡蛎壳资源开发利用综述[J].安徽农学通报,2015(21):79-80.
[17]PARK W H.Integrated constructed wetland systems employing alum sludge and oyster shells as filtermed ia for P removal[J].Ecological Engineering,2009,35(8):1275-1282.
[18]熊小京,黄智贤,景有海,等.牡蛎壳填料浸没式生物滤池的除磷特性[J].环境污染与防治,2003,25(6):329-331.
[19]苏兵,段金明,方宏达,等.牡蛎壳填料曝气生物滤池去除水源水中的氨氮[J].集美大学学报(自然科学版),2014,19(2):95-99.
[20]DING Y,LIU Y X,WU W X,et al.Evaluation of biochar effects on nitrogen retention and leaching in multi-layered soil columns[J].Water,Air,&Soil Pollution,2010,213(1/2/3/4):47-55.
[21]卢涌泉,邓振华.实用红外光谱解析[M].北京:电子工业出版社,1989.
[22]孙航,蒋煜峰,石磊平,等.不同热解及来源生物炭对西北黄土吸附敌草隆的影响[J].环境科学,2016,37(12):4857-4866.
[23]WHITE J E,CATALLO W J,LEGENDRE B L.Biomass pyrolysis kinetics:a comparative critical review with relevant agricultural residue case studies[J].Journal of Analytical and Applied Pyrolysis,2011,91(1):1-33.
[24]赵娟,李远文,杨耐德,等.改性牡蛎壳对废水中磷吸附性能的研究[J].化学新型材料,2014,42(3):154-156.
[25]黄艳,于岩,吴任平,等.硅藻土/牡蛎壳植被可回收废水除磷材料的研究[J].福州大学学报(自然科学版),2009,37(3):452-456.
[26]李坤权,郑正,蒋剑春,等.铅在棉秆基活性炭上的吸附动力学与热力学[J].环境科学,2010,31(5):1402-1408.
[27]马锋锋,赵保卫,刁静茹,等.牛粪生物炭对水中氨氮的吸附特性[J].环境科学,2015,36(5):1678-1685.
[28]曹玉成,单胜道,张妙仙,等.膨胀蛭石同步脱铵除磷的影响因素研究[J].环境科学与技术,2009,32(11):32-36.
[2]OZTURK N,BEKTAS T E.Nitrate removal from aqueous solution by adsorption onto various materials[J].Journal of Hazardous Materials,2004,112(1/2):155-162.
[3]MIZUTA K,MATSUMOTO T,HATATE Y,et al.Removal of nitrate-nitrogen from drinking water using bamboo powder charcoal[J].Bioresource Technology,2004,95(3):255-257.
[4]GONG G Z,YE S F,TIAN Y J,et al.Preparation of a new sorbent with hydrated lime and blast furnace slag for phosphorus removal from aqueous solution[J].Journal of Hazardous Materials,2009,166(2/3):714-719.
[5]MISHRA P C,PATEL R K.Use of agricultural waste for the removal of nitrate-nitrogen from aqueous medium[J].Journal of Environmental Management,2009,90(1):519-522.
[6]DEMIRAL H,GUNDUZOGLU G.Removal of nitrate from aqueous solutions by activated carbon prepared from sugar beet bagasse[J].Bioresource Technology,2010,101(6):1675-1680.
[7]AGRAWAL S G,KING K W,FISCHER E N,et al.PO3-4removal by and permeability of industrial byproducts and minerals:granulated blast furnace slag,cement kiln dust,coconut shell activated carbon,silica sand,and zeolite[J].Water,Air,&Soil Pollution,2011,219(1/2/3/4):91-101.
[8]XUE Y,HOU H,ZHU S.Characteristics and mechanisms of phosphate adsorption onto basicoxygen furnace slag[J].Journal of Hazardous Materials,2009,162(2/3):973-980.
[9]JUTIDAMRONGPHAN W,PARK K Y,DOCKKO S,et al.High removal of phosphate from wastewater using silica sulfate[J].Environmental Chemistry Letters,2012,10(1):21-28.
[10]EGEMOSE S,SONDERUP M J,BEINTHIN M V,et al.Crushed concrete as a phosphate binding material:apotential new management tool[J].Journal of Environmental Quality,2012,41(3):647-653.
[11]王万宾,胡飞,孔令瑜,等.人工湿地脱氮除磷基质的吸附能力及其影响因子[J].湿地科学,2016,14(1):122-128.
[12]NING P,HANS JOERG B,LI B,et al.Phosphate removal from wastewater by model-La(Ⅲ)zeolite adsorbents[J].Journal of Environmental Sciences,2008,20(6):670-674.
[13]KUMAR P,SUDHA S,CHAND S,et al.Phosphate removal from aqueous solution using coir-pith activated carbon[J].Separation Science and Technology,2010,45(10):1463-1470.
[14]AWUAL M R,JYO A,IHARA T,et al.Enhanced trace phosphate removal from water by zirconium(Ⅳ)loaded fibrous adsorbent[J].Water Research,2011,45(15):4592-4600.
[15]李林锋,吴小凤.天然牡蛎壳对磷吸附特性实验研究[J].三峡环境与生态,2011,33(6):1-4.
[16]赵娟,杨耐德,周亮.牡蛎壳资源开发利用综述[J].安徽农学通报,2015(21):79-80.
[17]PARK W H.Integrated constructed wetland systems employing alum sludge and oyster shells as filtermed ia for P removal[J].Ecological Engineering,2009,35(8):1275-1282.
[18]熊小京,黄智贤,景有海,等.牡蛎壳填料浸没式生物滤池的除磷特性[J].环境污染与防治,2003,25(6):329-331.
[19]苏兵,段金明,方宏达,等.牡蛎壳填料曝气生物滤池去除水源水中的氨氮[J].集美大学学报(自然科学版),2014,19(2):95-99.
[20]DING Y,LIU Y X,WU W X,et al.Evaluation of biochar effects on nitrogen retention and leaching in multi-layered soil columns[J].Water,Air,&Soil Pollution,2010,213(1/2/3/4):47-55.
[21]卢涌泉,邓振华.实用红外光谱解析[M].北京:电子工业出版社,1989.
[22]孙航,蒋煜峰,石磊平,等.不同热解及来源生物炭对西北黄土吸附敌草隆的影响[J].环境科学,2016,37(12):4857-4866.
[23]WHITE J E,CATALLO W J,LEGENDRE B L.Biomass pyrolysis kinetics:a comparative critical review with relevant agricultural residue case studies[J].Journal of Analytical and Applied Pyrolysis,2011,91(1):1-33.
[24]赵娟,李远文,杨耐德,等.改性牡蛎壳对废水中磷吸附性能的研究[J].化学新型材料,2014,42(3):154-156.
[25]黄艳,于岩,吴任平,等.硅藻土/牡蛎壳植被可回收废水除磷材料的研究[J].福州大学学报(自然科学版),2009,37(3):452-456.
[26]李坤权,郑正,蒋剑春,等.铅在棉秆基活性炭上的吸附动力学与热力学[J].环境科学,2010,31(5):1402-1408.
[27]马锋锋,赵保卫,刁静茹,等.牛粪生物炭对水中氨氮的吸附特性[J].环境科学,2015,36(5):1678-1685.
[28]曹玉成,单胜道,张妙仙,等.膨胀蛭石同步脱铵除磷的影响因素研究[J].环境科学与技术,2009,32(11):32-36.