摘要
植物腐烂产生的烂根水会大幅度增加水源水的COD_(Mn),从而增加水厂处理难度。本研究利用活性炭吸附去除水中的COD_(Mn),研究了活性炭的投加量、初始环境pH、吸附时间以及吸附温度对活性炭吸附COD_(Mn)的吸附效果的影响,并将实验数据与吸附动力学、热力学方程以及吸附等温线进行拟合,得到活性炭吸附COD_(Mn)的最佳投料比为10g/L。由吸附动力学得知,吸附过程与准一级动力学方程有较好的拟合效果。由吸附热力学得知,活性炭吸附COD_(Mn)的过程是伴随着吸热、熵增的非自发的过程,随着温度不断的升高,吸附反应发生的趋势越大。在25℃下Langmuir吸附模型的相关系数为0. 9711,表明Langmuir模型与活性炭吸附水中COD_(Mn)有较好的拟合效果。
The rotten root water produced by plant decay will greatly increase the COD Mn of the source water,thus increasing the difficulty of water treatment.In this study,activated carbon adsorption was used to remove COD Mn from water.The effects of activated carbon dosage,initial environmental pH,adsorption time and adsorption temperature on the adsorption of COD Mn on activated carbon were studied.The experimental data was fitted with adsorption kinetics,thermodynamic equations and adsorption isotherm.The optimum dosage of activated carbon to adsorb COD Mn is10g/L.It is known from the adsorption kinetics that the adsorption process fitted well with the quasi-first-order kinetic equation.It is known from adsorption thermodynamics that the process of adsorption of COD Mn by activated carbon is a non-spontaneous process accompanied by endothermic and entropic increase.As the temperature increases,the tendency of adsorption reaction increases.The correlation coefficient of Langmuir adsorption model at25℃is0.9711,which indicates that the Langmuir model fitted well for the process of activated carbon adsorbing COD Mn.
作者
李子木
王郑
黄晓江
李心悦
王子杰
许锴
林子增
Li Zimu;Wang Zheng;Huang Xiaojiang;Li Xinyue;Wang Zijie;Xu Kai;Lin Zizeng(School of Civil Engineering, Nanjing Forestry University, Nanjing 210037, China)
出处
《环保科技》
2018年第6期1-7,共7页
Environmental Protection and Technology
基金
国家自然科学基金资助项目(51608272)
江苏省建设系统科技项目(2017ZD055)
江苏高校优势学科建设工程资助项目(PAPD)
南京林业大学大学生创新训练计划资助项目(2018NFUSPITP351)
关键词
活性炭
CODMN
吸附
吸附特性
activated carbon
COD Mn
adsorption
adsorption characteristics
