摘要
磷是黑臭水体形成过程中的关键影响因素之一,如何绿色高效控磷是实现黑臭水体治理的重要途径。研究以我国储量丰富的天然海泡石为原料,通过共沉淀-悬浮液滴法制得镧镁改性海泡石凝胶微球(La/Mg-SEPM)。考察了纤维素(MCC)、海藻酸钠(SA)、镧镁改性海泡石(La/Mg-SEP)在La/Mg-SEPM中的质量配比、La/Mg-SEPM的投加量、水样pH、环境温度和吸附时间对磷吸附过程的影响,并结合表征分析探究了La/Mg-SEPM对黑臭水体中总磷的吸附机制。结果表明,当MCC、SA、La/Mg-SEP的质量配比为2∶2∶1,La/Mg-SEPM投加量为1.0 g/L时,La/Mg-SEPM对总磷的最大吸附量达21.03 mg/g,约为天然海泡石的11倍,在水样pH值为5~9、环境温度为5~25℃均表现出良好的磷吸附性能;La/Mg-SEPM具有较好的沉降性能,循环使用4次后仍能将水样中总磷质量浓度降至0.2 mg/L以下。经La/Mg-SEPM处理后的实际轻度和重度黑臭水样中总磷均能达到《地表水环境质量标准》(GB 3838—2002)地表水Ⅲ类水质总磷的标准限值。La/Mg-SEPM对磷的吸附主要为化学吸附控制的单层吸附过程,磷吸附机制主要涉及配体交换与表面沉淀。
Phosphorus is one of the key factors for black-odorous water body formation.Therefore,it is crucial to control the phosphorus of black-odorous water body in an environmentally friendly and efficient way.In this study,La/Mg modified sepiolite gel microspheres(La/Mg-SEPM)were prepared from the vast reserves of natural sepiolite at home by coprecipitation-suspension droplet method.The effects of various factors including the mass ratio of cellulose(MCC),sodium alginate(SA),La/Mg modified sepiolite(La/Mg-SEP)in the La/Mg-SEPM,La/Mg-SEPM dosage,pH of the water sample,ambient temperature,and adsorption time on the adsorption process of phosphorus were investigated,and the adsorption mechanism of phosphorus by La/Mg-SEPM from black-odorous water body was also analyzed based on the results of characterization.The results showed that La/Mg-SEPM exhibit the maximum phosphorus adsorption capacity of 21.03 mg/g when the mass ratio of MCC,SA,and La/Mg-SEP in La/Mg-SEPM was 2∶2∶1 as well as the dosage of La/Mg-SEPM was 1.0 g/L,which was around 11 times higher than that of natural sepiolite.Moreover,La/Mg-SEPM exhibited a good adsorption performance for phosphorus within the pH values range of 5~9 and ambient temperature of 5~25℃,and exhibited good settling property.After 4 cycles,the TP concentration in the water sample can still be reduced to below 0.2 mg/L by La/Mg-SEPM.The TP concentration in the actual mild and severe black-odorous water body after the treatment by La/Mg-SEPM was reached the limit of the surface water classⅢwater quality standard in Environmental Quality Standards for Surface Water(GB 3838—2002)for TP.In addition,the adsorption process of phosphorus was mainly controlled by chemical adsorption and monolayer adsorption,and ligand exchange and surface precipitation was a primary mechanism for phosphorus adsorption on La/Mg-SEPM.
作者
徐卓锐
陈超荣
田高峰
杨博文
葛飞
XU Zhuorui;CHEN Chaorong;TIAN Gaofeng;YANG Bowen;GE Fei(College of Environment and Resources,Xiangtan University,Xiangtan 411100,China)
出处
《净水技术》
CAS
2024年第2期152-161,197,共11页
Water Purification Technology
基金
湖南省科技厅重点研发计划项目(2018SK2012)。
关键词
镧镁改性海泡石
凝胶微球
黑臭水体
总磷
吸附
La/Mg modified sepiolite
gel microsphere
black-odorous water body
T
P adsorption
