摘要
为实现农村生活污水治理与污泥利用相结合,以广东省北江清淤底泥和湿地植被为原料,添加铁盐制成载铁生物质陶粒(陶粒A),同时使用非载铁生物质陶粒(陶粒B)、市售黏土质污水处理陶粒(陶粒C)开展生活污水除磷试验研究。试验结果表明:陶粒A具有丰富的蜂窝网状孔隙结构,可为铁离子提供有效载体,同时为磷酸盐的吸附提供了通道和活性点位。等温吸附模型表明陶粒A和陶粒B对总磷的吸附结果较符合Langmuir模型(R^(2)>0.95),陶粒C对总磷的吸附结果较符合Freundlich模型(R^(2)>0.82),且陶粒A的理论饱和吸附量Q_(max)远大于其他两种陶粒,为383.26 mg/kg。动态柱吸附实验显示陶粒A的最大吸附量q_(0)和半穿透时间τ均大于陶粒B和陶粒C,分别达到7.06 mg/g、458.80 min,使用Thomas模型和Yoon-Nelson模型均能较好地描述陶粒的动态吸附过程(R^(2)>0.86)。
The excessive phosphate removal is a key factor that controls eutrophication.A series of measures have been adopted to remove phosphate in domestic sewage and industrial wastewater,such as upgrading and renovating sewage treatment plants.However,the removal of phosphorus from domestic sewage in rural areas is restricted by technological capabilities and financial investments.In order to achieve the integration of the rural domestic sewage treatment and sediments utilization,a series of experiments are conducted to verify thephosphate ad⁃sorption ability of three kinds of ceramsites,including Ceramsite A made of dredging sediments from Beijiang River in Qingyuan City,Guangdong Province,local wetland vegetation and iron salt;Ceramsite B made of the same raw material with Ceramsite A without iron salt;Ceramsite C is commercially available.The experimental results showed:①Ceramstie A has rich honeycomb porous structures,which can provide an effective carrier for iron ions and act as channels and active sites for phosphate adsorption.Additionally,the nitrogen adsorption isotherms and BET surface area analysis shows that the Ceramsite C has a higher surface area and three kinds of ceramsites contain mainly mesopores(2 nm<d<50 nm).②The experimental data is inserted into Langmuir and Freundlich’s isotherms to undertake the mechanism and adsorption capacity of the test biosorbents.The adsorption isotherm models show that the adsorption results of Ceramsite A and Ceramsite B on total phosphorus(TP)are in better accordance with the Langmuir isotherm model(R^(2)>0.95),while Freundlich isotherm model is used(R^(2)>0.82)is more suitable to describe the adsorption process of Ceramsite C.Moreover,the theoretical saturated adsorption capacity Q_(max) of Ceramsite A is far more than that of the other ceramsites,reaching 383.26 mg/kg.③The results of dynamic column experiments show that the maximum adsorption capacity q0 and half penetration timeτof Ceramsite A are more than that of Ceramsite B and Ceramsite C,reaching 7.058 mg/g,458.80 min,respectively,indicating a better performance of Ceramsite A in phosphate absorption in flowing water.Simultane⁃ously,the dynamic adsorption process of ceramsite can be described relatively well by both the Thomas Model and Yoon Nelson Model(R^(2)>0.86).Overall,Ceramsite A has good adsorption ability for TP.The conclusions of the researches provide new ideas and methods for the resource utilization of dredging sediments and prove the feasibility of preparing ceramsite from sediments and then applying it as a matrix in a constructed wetland to absorb phosphate.
作者
洪昌红
肖耿锋
黄本胜
邱静
张之琳
HONG Chang-hong;XIAO Geng-feng;HUANG Ben-sheng;QIU Jing;ZHANG Zhi-lin(Guangdong Research Institute of Water Resources and Hydropower,Guangzhou 510630,Guangdong Province,China;Guangdong Key Laboratory of Hydrodynamic Research,Guangzhou 510630,Guangdong Province,China;State and Local Joint Engineering Laboratory of Estuarine and Hydraulic Technology,Guangzhou 510630,Guangdong Province,China)
出处
《中国农村水利水电》
北大核心
2023年第5期26-33,40,共9页
China Rural Water and Hydropower
基金
广东省水利科技创新项目(2021-06)
省属科研机构改革创新领域稳定性支持项目(2020L024)
省属科研机构创新能力建设专项资金(221016)。
关键词
载铁生物质陶粒
农村污水治理
等温吸附模型
动态吸附模型
iron carrying biomass ceramsite
rural sewage treatment
isothermal adsorption model
dynamic adsorption model
