Department of Ecology, Environment and Plant Sciences (DEEP), Stockholm University, 106 91 Stockholm, Sweden.
Department of Sustainable Development, Environmental Sciences and Technology, Division of Water and Environmental Engineering, KTH Royal Institute of Technology, 100 44 Stockholm, Sweden.
Environ Sci Technol. 2021 Sep 7;55(17):11937-11947. doi: 10.1021/acs.est.1c02308. Epub 2021 Aug 26.
This study tested two sediment amendments with active sorbents: injection of aluminum (Al) into sediments and thin-layer capping with Polonite (calcium-silicate), with and without the addition of activated carbon (AC), for their simultaneous sequestration of sediment phosphorus (P), hydrophobic organic contaminants (HOCs), and metals. Sediment cores were collected from a eutrophic and polluted brackish water bay in Sweden and incubated in the laboratory to measure sediment-to-water contaminant release and effects on biogeochemical processes. We used diffusive gradients in thin-film passive samplers for metals and semi-permeable membrane devices for the HOC polychlorinated biphenyls and polycyclic aromatic hydrocarbons. Al injection into anoxic sediments completely stopped the release of P and reduced the release of cadmium (Cd, -97%) and zinc (Zn, -95%) but increased the sediment fluxes of PAH (+49%), compared to the untreated sediment. Polonite mixed with AC reduced the release of P (-70%), Cd (-67%), and Zn (-89%) but increased methane (CH) release. Adding AC to the Al or Polonite reduced the release of HOCs by 40% in both treatments. These results not only demonstrate the potential of innovative remediation techniques using composite sorbent amendments but also highlight the need to assess possible ecological side effects on, for example, sedimentary microbial processes.
将铝（Al）注入沉积物中和用波利诺特（钙-硅）进行薄层覆盖，以及是否添加活性炭（AC），以同时固定沉积物中的磷（P）、疏水性有机污染物（HOCs）和金属。从瑞典富营养化和污染的咸水湾采集了沉积物岩芯，并在实验室中进行孵育，以测量沉积物向水中污染物的释放以及对生物地球化学过程的影响。我们使用薄膜扩散梯度被动采样器测量金属，使用半渗透膜装置测量多氯联苯和多环芳烃等 HOC。向缺氧沉积物中注入铝完全阻止了 P 的释放，并减少了镉（Cd，-97%）和锌（Zn，-95%）的释放，但与未处理的沉积物相比，增加了 PAH（+49%）的沉积物通量。与 AC 混合的波利诺特减少了 P（-70%）、Cd（-67%）和 Zn（-89%）的释放，但增加了甲烷（CH）的释放。在这两种处理中，向 Al 或波利诺特添加 AC 可将 HOC 的释放减少 40%。这些结果不仅证明了使用复合吸附剂改良剂的创新修复技术的潜力，还强调了需要评估对例如沉积物微生物过程等可能产生的生态副作用。
