沸石吸附水体中氨氮的热力学和动力学过程研究
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摘要
随着近年来各大自然水体富营养化程度的加重,废水中氨氮的处理显得尤为重要。我国浙江缙云有丰富的沸石矿藏,研究其对于沸石的吸附过程有着明显的应用价值。实验结果显示:在288～318 K范围内的温度对沸石吸附氨氮过程影响较小,在氨氮初始浓度为30 mg/L的条件下,小粒径沸石对氨氮的48 h吸附容量为1.13±0.06 mg/g,去除率为91%。大粒径沸石对氨氮的48 h吸附容量为1.10±0.06 mg/g,去除率为87%。沸石对氨氮的吸附过程遵循二级吸附动力学方程,Freundlich和Langmuir等温吸附方程均适用于描述沸石吸附氨氮的热力学过程。本研究表明天然沸石是一种合适的吸附剂,可用于废水或者天然水体中氨氮的去除。
The treatment of ammonia in wastewater has attracted more and more attention due to the aggravation of eutrophication of natural water body recently.Jinyun of Zhejiang Province is rich in zeolite minerals,and thus the research on adsorption of zeolite has obvious practical value.The experimental results showed that temperature had little effect on ammonia adsorption within the range of 288-318 K.The removal rate of ammonia is 91% within 48 h while the initial concentration of ammonia is 30 mg/L and the adsorption capacity is 1.13±0.06 mg/g for little particle size of zeolite.While for big zeolite,87% ammonia is removed within 48 h and the adsorption capacity is 1.10±0.06 mg/g.The adsorption process was found to follow the second order kinetic model.The adsorption thermodynamic could be described by both Freundlich and Langmuir.The result indicated that zeolite is a suitable absorbent and can be used in the removal of ammonia in wastewater or natural water body.
The treatment of ammonia in wastewater has attracted more and more attention due to the aggravation of eutrophication of natural water body recently.Jinyun of Zhejiang Province is rich in zeolite minerals,and thus the research on adsorption of zeolite has obvious practical value.The experimental results showed that temperature had little effect on ammonia adsorption within the range of 288-318 K.The removal rate of ammonia is 91% within 48 h while the initial concentration of ammonia is 30 mg/L and the adsorption capacity is 1.13±0.06 mg/g for little particle size of zeolite.While for big zeolite,87% ammonia is removed within 48 h and the adsorption capacity is 1.10±0.06 mg/g.The adsorption process was found to follow the second order kinetic model.The adsorption thermodynamic could be described by both Freundlich and Langmuir.The result indicated that zeolite is a suitable absorbent and can be used in the removal of ammonia in wastewater or natural water body.
引文
[1]张海璇,唐玉霖,于水利.我国沸石去除水中氨氮的现状研究[J].四川环境,2011,30(5):80-84.
[2]Zorpas A A,Constantinides T,Vlyssides A G,et al.Heavymetal uptake by natural zeolite and metals partitioning insewage sludge compost[J].Bioresource Technology,2000,72(2):113-119.
[3]Ortega E A,Cheeseman C,Knight J,et al.Properties of al-kali-activated clinoptilolite[J].Cement and Concrete Re-search,2000,30(10):1641-1646.
[4]唐登勇,郑正,林志荣,等.天然沸石吸附低浓度氨氮废水的研究[J].环境科学与技术,2010,12:206-209.
[5]祝万鹏,杨津湘,杨志华,等.氨氮在饱水粉砂土和亚砂土层中吸附过程及其模拟[J].环境科学,1996,17(2):9-11.
[6]Lahav O,Green M.Ammonium removal using ion exchangeand biological regeneration[J].Water Research,1998,32(7):2019-2028.
[7]徐丽花,周琪.天然沸石去除氨氮研究[J].上海环境科学,2002,21(8):506-508.
[8]万政钰.利用改性沸石吸附剂处理氨气的研究[D].长春;吉林大学,2009.
[9]中华人民共和国环境保护部.HJ535-2009.水质氨氮的测定纳氏试剂分光光度法[S].中国环境科学出版社,2010.
[10]任刚,崔福义.改性天然沸石去除水中氨氮的研究[J].环境污染治理技术与设备,2006,7(3):75-80.
[11]张元璋.磺酸基纤维素的合成与吸附性能研究[D].上海:上海理工大学,2011.
[12]HO Y S,Mckay G.The sorption of lead(II)ions on peat[J].Water Research,1999,33(2):578-584.
[13]HO Y S,Mckay G.Sorption of dye from aqueous solutionby peat[J].Chemical Engineering Journal,1998,70(2):115-124.
[14]杨胜科,王文科,李翔,等.沸石去除地下水中氨氮的影响因素分析及作用机理探讨[J].西安工程学院学报,2000,22(3):69-72.
[2]Zorpas A A,Constantinides T,Vlyssides A G,et al.Heavymetal uptake by natural zeolite and metals partitioning insewage sludge compost[J].Bioresource Technology,2000,72(2):113-119.
[3]Ortega E A,Cheeseman C,Knight J,et al.Properties of al-kali-activated clinoptilolite[J].Cement and Concrete Re-search,2000,30(10):1641-1646.
[4]唐登勇,郑正,林志荣,等.天然沸石吸附低浓度氨氮废水的研究[J].环境科学与技术,2010,12:206-209.
[5]祝万鹏,杨津湘,杨志华,等.氨氮在饱水粉砂土和亚砂土层中吸附过程及其模拟[J].环境科学,1996,17(2):9-11.
[6]Lahav O,Green M.Ammonium removal using ion exchangeand biological regeneration[J].Water Research,1998,32(7):2019-2028.
[7]徐丽花,周琪.天然沸石去除氨氮研究[J].上海环境科学,2002,21(8):506-508.
[8]万政钰.利用改性沸石吸附剂处理氨气的研究[D].长春;吉林大学,2009.
[9]中华人民共和国环境保护部.HJ535-2009.水质氨氮的测定纳氏试剂分光光度法[S].中国环境科学出版社,2010.
[10]任刚,崔福义.改性天然沸石去除水中氨氮的研究[J].环境污染治理技术与设备,2006,7(3):75-80.
[11]张元璋.磺酸基纤维素的合成与吸附性能研究[D].上海:上海理工大学,2011.
[12]HO Y S,Mckay G.The sorption of lead(II)ions on peat[J].Water Research,1999,33(2):578-584.
[13]HO Y S,Mckay G.Sorption of dye from aqueous solutionby peat[J].Chemical Engineering Journal,1998,70(2):115-124.
[14]杨胜科,王文科,李翔,等.沸石去除地下水中氨氮的影响因素分析及作用机理探讨[J].西安工程学院学报,2000,22(3):69-72.