摘要
通过批量吸附实验考察磁性铁锆改性沸石对水中磷酸盐的去除性能,再通过底泥培养实验考察磁性铁锆改性沸石覆盖对河道底泥磷释放的控制效果。结果表明:磁性铁锆改性沸石对水中磷酸盐的吸附能力良好。无论是在自然状态下,还是在缺氧控制状态下,河道底泥均向上覆水体中释放出一定数量的溶解性活性磷(SRP),而磁性铁锆改性沸石覆盖可以有效控制河道底泥中磷的释放,使得上覆水体中SRP浓度处于非常低的水平(0. 007～0. 031 mg/L)。当覆盖层受到破坏并使覆盖材料与表层底泥混合之后,磁性铁锆改性沸石仍然可以极大地降低上覆水体中SRP浓度,并且使底泥中潜在可移动态磷向较为稳定和非常稳定的磷形态转变,以及促使底泥中生物可利用性磷向非生物可利用性磷转变,使得底泥中磷发生释放的风险降低。以上结果初步表明,磁性铁锆改性沸石是一种非常有希望用于控制河道底泥中磷释放的覆盖材料。
The performance of phosphate removal by magnetic iron/zirconium-modified zeolite(FeZrZeo)using batch experiments and the efficiency of sediment capping with FeZrZeo to control phosphorus(P)release from river sediments were tested using incubation experiments.The results showed that the as-prepared FeZrZeo exhibited a high phosphate adsorption capacity.P in river sediments could be released into the overlying water under natural and anoxic conditions.However,sediment capping with FeZrZeo can greatly reduce the releasing flux of SRP from the sediment to the overlying water,resulting in a very low level of SRP in the overlying water(0.007-0.031 mg/L).When FeZrZeo-based barrier layer was destroyed,the mixing of FeZrZeo with sediment not only led to the reduction of SRP concentration in the overlying water,but also resulted in the transformation of the mobile P(sum of the NH4Cl extractable P(NH4Cl-P)and Na2S2O4/NaHCO3 extractable P(BD-P))to the more stable phosphorus such as the NaOH extractable P(NaOH-rP)and residual P(Res-P).Furthermore,the mixing of FeZrZeo with sediment led to the transformation of bioavailable P including anion resin extractable P(Resin-P),water soluble P(WSP),readily desorbable P(RDP),NaOH extractable P(AAP)and NaHCO3 extractable P(Olsen-P)to the non-bioavailable P in the sediment,resulting in the decrease in the P bioavaiability of the sedidment.Results of this study show that FeZrZeo is a promising capping material for the control of SRP release from river sediments.
作者
汲雨
奚秀清
詹艳慧
陈海洋
林建伟
陈璐
侯雨苇
李志强
李十盛
韩星雨
JI Yu;XI Xiuqing;ZHAN Yanhui;CHEN Haiyang;LIN Jiiinwei;CHEN Lu;HOU Yuwei;LI Zhiqiang;LI Shisheng;HAN Xingyu(College of Marine Ecology and Environment,Shanghai Ocean University,Shanghai 201306,China)
出处
《上海海洋大学学报》
CAS
CSCD
北大核心
2019年第2期267-276,共10页
Journal of Shanghai Ocean University
基金
国家自然科学基金(51408354
50908142)
上海市自然科学基金(15ZR1420700)
关键词
磁性铁锆改性沸石
底泥
磷
覆盖
magnetic iron/zirconium-modified zeolite
sediment
phosphorus
capping
