Metals Removal Via Spouted Bed Electrolytic Reactors

通过喷射床电解反应器去除金属

• 批准号: 6901542
• 负责人: Joseph M Calo
• 金额: $ 23.56万
• 依托单位: BROWN UNIVERSITY
• 依托单位国家: 美国
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-04-01 至 2009-03-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/6901542
• 关键词: adsorption; electrochemistry; electrolytes; environmental contamination; environmental protection; environmental transport; heavy metals; soil pollution; soil sampling; technology /technique development; water pollution; water pollution control; water sampling /testing; water treatment

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.

在2003年CERCLA优先级的275种物质中，包括所有重金属的危险物质。因此，有效修复受污染的地点以重复使用，必须始终解决从固体材料和地下水中有效去除重金属的。该项目的目的是开发两种新的前坐骨补救技术，用于污染地点，基于将喷出的床颗粒电极应用于从受污染的水中除去重金属的重金属：（1）用电解金属和金属混合物中的重金属：（1） （2）喷口 床电吸收/解吸（SBED），用于通过提高其能力和污染物的去除率来提高使用活性碳吸附剂的使用的有效性，以提高使用激活的碳吸附剂的有效性，从而提高使用较少的吸附剂，从而降低热量再生的当前成本。将实现以下特定目的来实现此目标：具体目的1：将建造和开发两个新的喷出床细胞系统：一个用于金属电工（喷嘴床电解式恢复，SBER，SBER），另一个用于在激活碳吸附剂上重新金属化合物的电气吸附/吸收/吸收（淘汰床床上的电气吸收/desorptive/desorption/desed）。具体目标2：SBER将用于调查和开发有效的方法，以在同一设备中以高速度从溶液中恢复多种金属。这种方法将涉及从选定的四个（CD，CR，CU和NI）单个金属中对单个金属进行电化学和恢复的研究，并依次构建到二元，三元，最后是第四纪混合物。这还将涉及新技术的适应，例如电解恢复，加上“进程沉淀”以获得高回收率。特定目标3：绒毛系统将用于调查和开发有效的方法，以用于某些重金属（AS和HG）化合物的电辅助吸附，以提高受污染的水的去除率， 并降低活性碳吸附剂热再生的当前成本。 特定目的4：基于现有的流体动力模型，以及从任务1、2和3获得的流体动力和电化学数据的数值模型，并将用于探索实验室系统对操作规模系统的扩展策略。具体的目标5。该项目的高潮将集中于从地下水中获得的污染地点和/或通过浸出含有金属混合物的污染土壤中的样品中回收所选金属。将在我们的SBRP和Ridem中的Oarticieant提出的基于特定的来源。