Metals Removal Via Spouted Bed Electrolytic Reactors

通过喷射床电解反应器去除金属

• 批准号: 7599028
• 负责人: Joseph M Calo
• 金额: $ 24.47万
• 依托单位: BROWN UNIVERSITY
• 依托单位国家: 美国
• 资助国家: 美国
• 起止时间: 至
• 项目状态: 未结题
• 来源: https://reporter.nih.gov/project-details/7599028
• 关键词: Address; Adsorption; Beds; Carbon; Cathodes; Cells; Coupled; Data; Development; Devices; Disadvantaged; Electrochemistry; Electrodes; Excision; Goals; Hazardous Substances; Health; Heavy Metals; Human; Hybrids; Individual; Investigation; Kinetics; Knowledge; Laboratories; Learning; Metals; Methods; Modeling; Natural regeneration; Participant; Particulate; Precipitation; Process; Rate; Recommendation; Recovery; Research; Sampling; Site; Soil; Solid; Solutions; Source; Stream; System; Techniques; Technology; Toxic effect; Update; Use Effectiveness; Water; aqueous; base; cost; exposed human population; improved; new technology; particle; remediation; scale up; wasting

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.

2003年CERCLA有害物质优先清单中的275种物质中，全部包含重金属。因此，有效修复污染场地以供再利用必须始终解决从固体材料和地下水中有效去除重金属的问题。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去除污染水中重金属的应用：（1）喷动床电解回收（SBER）电解提取金属和金属混合物； (2) 喷出 床电吸附/解吸 (SBED) 用于电辅助吸附某些重金属化合物，通过提高活性炭吸附剂的容量和污染物去除率来提高活性炭吸附剂的使用效率，从而减少需要的吸附剂，并降低电流热再生成本。这一目标将通过实现以下具体目标来实现： 具体目标 1：将建造和开发两个新的喷动床电池系统：一个用于金属电解沉积（喷动床电解回收，SBER），另一个用于重金属的电吸附/解吸活性炭吸附剂上的金属化合物（喷动床电吸附/解吸，SBED）。具体目标 2：SBER 将用于研究和开发有效方法，以在同一设备中从溶液中高速回收多种金属。这种方法将涉及电化学研究以及从选定的四种（镉、铬、铜和镍）单个金属中回收单个金属，依次形成二元、三元和最后的四元混合物。这还涉及采用新技术，例如电解回收与“过程中沉淀”相结合，以实现高回收率。具体目标 3：SBED 系统将用于研究和开发某些重金属（As 和 Hg）化合物的电辅助吸附的有效方法，以提高污染水的去除率， 并降低目前活性炭吸附剂热再生的成本。 具体目标 4：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，将开发 SBER 和 SBED 系统的数值模型，并用于探索实验室系统扩大到操作规模的策略系统。具体目标 5. 该项目的最终目标是从地下水和/或含有金属混合物的受污染土壤中浸出获得的污染场地样品中回收选定的金属。具体来源将根据我们的 SBRP 和 RIDEM 中 oartioants 的建议来确定。