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Development of an innovative approach for in situ treatment of PCB impacted sediments by microbial bioremediation

开发一种通过微生物生物修复原位处理受 PCB 影响的沉积物的创新方法

基本信息

批准号：
10760823
负责人：
Craig Bennett Amos
金额：
$ 64.49万
依托单位：
REMBAC ENVIRONMENTAL, LLC
依托单位国家：
美国
项目类别：
财政年份：
2020
资助国家：
美国
起止时间：
2020-09-01 至 2025-07-31
项目状态：
未结题

来源：
https://reporter.nih.gov/project-details/10760823
关键词：
Address Aerobic Amendment Anaerobic Bacteria Area Bacteria Biological Assay Biological Availability Bioreactors Bioremediations Carbon Cell Count Cells Collaborations Communities Complex Consumption Cost Analysis Coupled Data Development Engineering Ensure Environment Environmental Impact Equipment and supply inventories Excision Fishes Food Webs Freeze Drying Goals Growth Growth Factor Habitats Health Human In Situ Industrialization Legal patent Methodology Methods Microbe Monitor Municipalities National Research Council Oxidation-Reduction Performance Phase Polychlorinated Biphenyls Privatization Process Production Reporting Reproducibility Research Research Personnel Risk Scientist Shipping Site Small Business Innovation Research Grant Sodium Chloride Source Superfund Surface System Techniques Technology Technology Transfer Testing Toxic effect United States United States Environmental Protection Agency Universities Water bioaccumulation commercialization commercially viable technology contaminated sediment cost cost effective cost effective treatment dechlorination density effectiveness analysis effectiveness evaluation efficacy evaluation field study fundamental research improved innovation interest landfill manufacturing scale-up microbial microorganism minimally invasive novel pollutant preservation receptor remediation restoration scale up success superfund site treatment site

项目摘要

PROJECT SUMMARY Polychlorinated biphenyls (PCBs) are one of the most problematic of legacy pollutants. Persistent and mobile in the environment, PCBs are largely ubiquitous in depositional sediments of aquatic systems in industrial regions of the United States. Their relatively high toxicity and bioaccumulation potential cause elevated risk to both human and ecological receptors. As such, PCBs are often the primary risk driver at Superfund sediment sites. Common practices for remediating PCB-impacted sediments are costly, often involving the physical removal of contaminated sediments and disposal of the sediments in a confined landfill, and/or installation of a multi-layered engineered cap over the contaminated sediments. An emerging strategy for effectively removing PCBs from sediments in situ is the use of bio-amended activated carbon (AC), which employs AC pellets inoculated with enriched cultures of PCB-degrading microbes. The co- investigators of this proposed research have performed the fundamental research behind the use of bio- amended AC for remediation of PCBs in sediment and have patented commercially-viable methods for growing, inoculating, and delivering the bioamended AC pellets to sediments. The prior Phase I project, a collaboration between university scientists and RemBac Environmental, addressed two factors that limit the ready use of this technology for large, multi-acre sites: 1) the large-scale growth, storage, and transport of anaerobic PCB degrading bacteria, and; 2) large-scale methods for inoculating and deploying the bioamended AC pellets. The PCB halorespiring anaerobe was successfully scaled up to the maximum density in a bench-scale bioreactor, methods were developed for storage of cells by lyophilization and two approaches were successfully tested for the continuous, uniform inoculation of high volumes of AC pellets with the PCB-degrading microorganisms. The proposed research will advance the technology towards commercialization by demonstrating the efficacy of the methods developed in Phase I for scaled up production at a commercial facility, and perform a pilot-scale demonstration of the technology at the New Bedford Harbor Superfund Site (NBHSS). PCB degrading microorganisms will be scaled up to cell numbers sufficient to treat over 1 acre, and AC pellets will be inoculated on-site using methods developed in Phase I to assess the efficacy of the application methods in a tidal marsh. PCB levels in sediment and water will be assayed after one year to 1) assess the effectiveness and environmental impact of the treatment, and 2) assess the stability of the treatment with tidal activity. Finally, a cost analysis conducted for the entire process to assess the commercial viability of bio-amended AC as a cost- effective treatment for PCB impacted sites. The proposed research is anticipated to result in a direct transfer of this technology from pilot-scale to full commercial viability through an active collaboration with the U.S. Environmental Protection Agency (USEPA), U.S. Army Corps of Engineers (USACE), engineering consultants, and Superfund site stakeholders.

项目总结