Metals Removal Via Spouted Bed Electrolytic Reactors

在2003年CERCLA危险物质优先清单上的275种物质中，包括所有重金属。因此，有效的补救污染场地的再利用必须始终解决有效地去除重金属从固体材料和地下水。该项目的目标是开发两种新的污染场地异位修复技术，基于喷动床颗粒电极应用于去除污染沃茨中的重金属：（1）喷动床电解回收（SBER），用于电解提取金属和金属混合物;（2）喷动床电解回收（SBER）， 床电吸附/解吸（SBED）用于某些重金属化合物的电辅助吸附，以通过增加活性炭吸附剂的容量和污染物去除速率来提高活性炭吸附剂的使用效率，从而需要较少的吸附剂，并降低热再生的当前成本。这一目标将通过实现以下具体目标来实现：具体目标1：将构建和开发两种新的喷动床电解槽系统：一种用于金属电解提取（喷动床电解回收，SBER），另一种用于活性炭吸附剂上重金属化合物的电吸附/解吸（喷动床电吸附/解吸，SBED）。具体目标二：SBER将用于研究和开发有效的方法，在同一设备中以高速率从溶液中回收多种金属。这种方法在这里将涉及调查的电化学和回收的个别金属从一组选定的四个（镉，铬，铜和镍）个别金属，依次建立二元，三元，最后四元混合物。这还将涉及采用新技术，如电解回收结合“过程中沉淀”，以提高回收率。具体目标3：SBED系统将用于研究和开发有效的方法，用于电辅助吸附某些重金属（As和Hg）化合物，以提高污染水中的去除率， 并降低活性炭吸附剂热再生的当前成本。 具体目标4：SBER和SBED系统的数值模型，基于现有的流体动力学模型，以及从任务1，2和3获得的流体动力学和电化学数据将被开发和用于探索实验室系统到操作规模系统的放大策略。具体目标5.该项目的最终成果将侧重于从受污染场地的地下水和（或）通过沥滤含有金属混合物的受污染土壤获得的样本中回收选定的金属。将根据SBRP和RIDEM中的建议确定具体来源。

Among the 275 substances on 2003 CERCLA Priority List of Hazardous Substances are included all the heavy metals. Thus, the effective remediation of contaminated sites for reuse must invariably address the efficient removal of heavy metals from solid materials and groundwater. The goal of this project is the development of two new ex-situ remediation technologies for contaminated sites, based on the application of spouted bed particulate electrodes to the removal of heavy metals from contaminated waters: (1) Spouted Bed Electrolytic Recovery (SBER) for electrowinning metals and metal mixtures; and (2) Spouted Bed Electrosorption/Desorption (SBED) for the electro-assisted adsorption of certain heavy metal compounds to improve the effectiveness of the use of activated carbon adsorbents by increasing their capacity and contaminant removal rates, so that less adsorbent is needed, and to reduce the current costs of thermal regeneration. This goal will be achieved by fulfilling the following Specific Aims: Specific Aim 1: Two new spouted bed cell systems will be constructed and developed: one for metal electrowinning (Spouted Bed Electrolytic Recovery, SBER), and the other for electrosorption/desorption of heavy metal compounds on activated carbon adsorbents (Spouted Bed Electrosorption/Desorption, SBED). Specific Aim 2: The SBER will be used to investigate and develop effective methods to recover multiple metals from solutions at high rates in the same device. This approach here will involve investigation of the electrochemistry and recovery of individual metals from a selected set of four (Cd, Cr, Cu and Ni) individual metals, successively building up to binary, ternary, and finally quaternary mixtures. This will also involve adaptation of new techniques, such as electrolytic recovery coupled with "in-process precipitation" for high recovery rates. Specific Aim 3: The SBED system will be used to investigate and develop effective methods for the electro-assisted adsorption of certain heavy metal (As and Hg) compounds to improve removal rates from contaminated water, and to reduce the current costs of thermal regeneration of activated carbon adsorbents. Specific Aim 4: Numerical models of SBER and SBED systems, based on existing hydrodynamic models, and hydrodynamic and electrochemical data obtained from Tasks 1, 2, and 3 will be developed and used to explore scale-up strategies of laboratory systems to operating-scale systems. Specific Aim 5. The culmination of the project will focus on recovery of selected metals from samples from contaminated sites obtained from groundwater and/or by leaching of contaminated soils containing mixtures of metals. Specific sources will be identified based uoon recommendations from oarticioants in our SBRP and RIDEM.