摘要
选取碱、Mg^(2+)和Zn^(2+)复合改性的沸石、石灰石和硅藻土为骨料,参照植生型多孔混凝土制作方法,制作了七种不同骨料体积比的模块化人工湿地基质。通过静态吸附实验对其脱氮除磷性能进行比较。筛选出三种模块化基质进行等温吸附实验和动力学吸附实验,对其脱氮除磷机制进行研究。结果表明:以单一改性沸石为骨料的模块化基质脱NH_(4)^(+)-N效果最好,其理论最大吸附量为45.79 mg/g;以三种改性基质按体积比1∶1∶1配比为骨料制作的模块化基质除PO_(4)^(3-)-P效果最好,其理论最大吸附量为11.52 mg/g;准二级吸附动力学模型能更好地拟合三种基质脱氮除磷的吸附动力学过程,三种基质对NH_(4)^(+)-N和PO_(4)^(3-)-P的吸附速率均受化学吸附速率控制。
According to the production method of plant-based porous concrete,seven kinds of modular constructed wetland substrates with different substrate volume ratios were fabricated,using the alkali,Mg^(2+)and Zn^(2+)composite modified zeolite,limestone and diatomite as aggregates.The nitrogen and phosphorus removal performance were compared through the static adsorption experiments.Three modular substrates were selected for the isothermal and kinetic adsorption experiments,aiming to study the mechanism of nitrogen and phosphorus removal.The results showed that the modular substrate with a single modified zeolite as the substrate has the best performance for NH_(4)^(+)-N removal,and its theoretical maximum adsorption capacity is 45.79 mg/g.The modular substrate fabricated by three modified substrates with a volume ratio of 1:1:1 has the best effect on the removal of PO_(4)^(3-)-P,and its theoretical maximum adsorption capacity is 11.52 mg/g.The quasi second-order adsorption kinetics model can better fit the adsorption kinetics of nitrogen and phosphorus removal in the three modular substrates,and the adsorption rates of nitrogen and phosphorus are controlled by chemisorption rates.
作者
陈思佳
黄丹
高彦宁
孟志国
张国权
CHEN Sijia;HUANG Dan;GAO Yanning;MENG Zhiguo;ZHANG Guoquan(School of Environmental Science and Technology,Dalian University of Technology,Dalian 116023,China;China Shipbuilding Industry Group Environmental Engineering Co.,Ltd.,Beijing 100039,China;Sinochem Shanghai ShenHuaYuan Technology Co.,Ltd.,Shanghai 201203,China)
出处
《水处理技术》
CAS
CSCD
北大核心
2024年第2期44-50,共7页
Technology of Water Treatment
基金
国家自然科学基金(21777018)。
关键词
人工湿地
基质改性
生态混凝土
脱氮除磷
吸附
constructed wetland
substrate modification
eco-concrete
nitrogen and phosphorus removal
adsorption
