不同改性方法对污泥生物质炭磷吸附能力的影响研究  

Two Modified Sludge Based Biochar Adsorbents in Phosphorus Removal from Wastewater

作　　者：李亚美 孟猛 田大永 马超振 马培[2] LI Yamei;MENG Meng;TIAN Dayong;MA Chaozhen;MA Pei(The Second Institute of Geological Environment Investigation of Henan Geological and Mineral Resources Exploration and Development Bureau,Zhengzhou 450000,China;School of Environment and Ecological Engineering Hennan University of Engineering,Xinzheng 451191,China)

机构地区：[1]河南省地质矿产勘查开发局第二地质环境调查院,河南郑州450000 [2]河南工程学院环境与生物工程学院,河南新郑451191

出　　处：《中国沼气》2023年第6期34-38,共5页China Biogas

基　　金：河南省地质矿产勘查开封局2021年度局管地质环境项目(豫地环[2021]3号);2021年度河南省重点研发和推广专项(212102310082)。

摘　　要：为了给市政污泥寻找一种合适的处理方法,以市政污泥为原材料,用热解和氯化镧改性两种方法制备生物质炭材料,用于处理含磷废水。探析了pH值、磷初始浓度以及干扰离子对污泥生物质炭除磷效果的影响,并讨论了污泥生物质炭磷吸附的热力学过程。结果表明:氯化镧改性污泥生物质炭对磷的最大平衡吸附量为58.76 mg·g^(-1),是热解污泥生物质炭磷最大吸附量(5.50 mg·g^(-1))的近11倍;热解污泥生物质炭磷吸附的最适pH值为6.0~10.0,而氯化镧改性污泥生物质炭磷吸附的最适pH值为4.0~6.0。Langmuir等温吸附模型能够很好地拟合热解污泥生物质炭吸附磷的热力学过程(R^(2)=0.9436),Freundlich等温吸附模型能很好地拟合氯化镧改性污泥生物质炭吸附磷的热力学过程(R 2=0.9652)。氯化镧改性污泥生物质炭对磷吸附有较高的选择性,当干扰阴离子Cl^(-)、NO_(3)^(-)和SO_(4)^(2-)在很高浓度(0.5 mol·L^(-1))下时对氯化镧改性污泥生物质炭磷吸附的影响较弱。高浓度的HCO_(3)^(-)(5 mol·L^(-1))会显著增加水体的pH值,降低了氯化镧改性污泥生物质炭磷的吸附能力,但该生物质炭对磷仍保持着较强的吸附能力。氯化镧改性污泥生物质炭可以有效地去除污水中的磷,缓解水体富营养化,实现污泥的资源化利用。To find a suitable adsorption for phosphorus removal,municipal sludge was modified by pyrolysis and lanthanum to remove phosphorus from wastewater.This study discuss the effect of pH,the initial concentration of phosphorus and the co-existing ions on phosphorus adsorption,and the adsorption thermal dynamics were also investigated.Results show that the maximum adsorption quantity by lanthanum modified biochar was 58.76 mg·g^(-1),almost 11 times of that by pyrolysis modified biochar.The suitable pH for phosphorus removal by pyrolysis modified biochar was 6.0~10.0,while that by lanthanum modified biochar was 4.0~6.0.Langmuir model can fit the thermal dynamics of phosphorus adsorption process on pyrolysis modified biochar,with R^(2)of 0.9436;while Freundlich model fits that on lanthanum modified biochar well,with R^(2)of 0.9652.Lanthanum modified biochar was insensitive to the coexisting anions.Even when the coexisting ions,such as Cl^(-)、NO_(3)^(-)0000000000 and SO_(4)^(2-),were in a high concentration(5.0 mol·L^(-1)),they still have little effect on phosphorus adsorption by lanthanum modified biochar.HCO_(3)^(-)slightly affected phosphorus adsorption,but a good adsorption capacity was still maintained.Lanthanum modified biochar can effectively adsorb and remove phosphorus in water and provide a new way for the resource utilization of water treatment sludge.

关 键 词：市政污泥 生物质炭 磷 干扰离子 热力学 

分 类 号：TQ016[化学工程] X56[环境科学与工程—环境工程]