(TSE03-O) Bauxite Residue (Red Mud) Neutralization/Treatment Using Fly Ash and Direct Carbonization
(TSE03-O) 铝土矿残渣(赤泥)中和/使用飞灰和直接碳化处理
基本信息
- 批准号:0329424
- 负责人:
- 金额:$ 10万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Standard Grant
- 财政年份:2003
- 资助国家:美国
- 起止时间:2003-11-01 至 2006-10-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
Safe treatment and storage of high volume industrial waste streams pose unique waste management challenges. Land disposal of these materials often has negative environmental impacts such as contamination of soil and groundwater, and consumes vast areas of land. Bauxite residue (Red Mud) from aluminum production, fly ash from coal combustion, and waste water treatment plant (WWTP) biosolids are three examples of high volume waste streams. Approximately 3 million tons of Red Mud are produced in the U.S. each year (30 M/yr globally), and are disposed in land-based impoundment reservoirs. Approximately 63 million and 7 million tons of fly ash and biosolids are generated annually in the U.S., respectively, much of which is disposed of in landfills. Another high volume (Gigatons/yr) waste stream with serious environmental impacts is CO2. Safe disposal of these wastes are a requisite. New methods for sustainable management and ways to find beneficial use for these wastes are highly desirable. Red Mud is usually managed by discharge into engineered or natural impoundment reservoirs, with subsequent dewatering by gravity consolidation and sometimes with capping for closure. Revegetation of dewatered Red Mud is not possible without addition of amendments because of the high pH, high salinity, and absence of nutrients and organic constituents.This proposal investigates the potential of using high volume waste materials, specifically CO2 and acidic fly ash, to neutralize Red Mud for the purpose of soil building and revegetation. The potential of Red Mud to safely sequester CO2 will also be determined. Bench scale batch experiments will be used to evaluate the rate and extent of Red Mud neutralization by contacting with dilute carbon dioxide waste streams, and by addition of acidic fly ash. The properties of the resulting mixture will be evaluated including pH, heavy metal leaching potential, carbonate mineral content, texture, bulk density, and water holding capacity. The additional neutralization capacity and reduction in heavy metal leaching afforded by WWTP biosolids, a common organic soil amendment needed to aid revegetation of surficial neutralized Red Mud, will also be determined. Various Red Mud to ash ratios, CO2 concentrations, and organic amendment concentrations will be used to determine which ratio provides optimal soil properties for revegetation. Lastly, engineering schemes to implement this technology will be evaluated for a possible Phase II field demonstration.Expected benefits and broader impacts. This project will provide new methods for neutralizing Red Mud, a high volume, highly alkaline residue from bauxite mining, with other high volume waste materials (CO2, acidic fly ash, biosolids). Treatment of Red Mud will make possible revegetation and environmental restoration of the large Red Mud disposal areas in the U.S. and elsewhere. The beneficial use of CO2, fly ash, and biosolids for this purpose will lower the environment impact of several industries. The potential exists to use millions of tons of CO2 or fly ash in Red Mud neutralization rather than emission to the atmosphere or disposal in a landfill, respectively. As much as 785% of the annual CO2 emissions from aluminum smelting can potentially be sequestered in the process of neutralizing Red Mud currently in storage. This project will also provide unique training opportunities for graduate and undergraduate students in the area of sustainable environmental management.
安全处理和储存大量工业废物流构成了独特的废物管理挑战。这些材料的土地处置往往对环境产生负面影响,如污染土壤和地下水,并消耗大量土地。来自铝生产的生物质残渣(红泥)、来自煤燃烧的飞灰和废水处理厂(WWTP)生物固体是高容量废物流的三个实例。美国每年生产约300万吨赤泥(全球每年3000万吨),并在陆基蓄水池中处置。在美国,每年产生大约6300万吨和700万吨的粉煤灰和生物固体,其中大部分被弃置于堆填区。 另一个具有严重环境影响的高容量(千兆吨/年)废物流是CO2。安全处置这些废物是必要的。非常需要可持续管理的新方法和为这些废物找到有益用途的途径。 赤泥通常通过排放到工程或天然蓄水池中进行管理,随后通过重力固结进行脱水,有时进行封盖。由于高pH值,高盐度,缺乏营养物质和有机成分,脱水红泥的植被恢复是不可能的,没有添加的修正案。本提案调查了使用大量废物的潜力,特别是二氧化碳和酸性粉煤灰,以中和红泥的土壤建设和植被恢复的目的。还将确定红泥安全封存二氧化碳的潜力。实验室规模的分批实验将用于评估通过与稀释的二氧化碳废物流接触以及通过添加酸性粉煤灰来中和赤泥的速率和程度。将评价所得混合物的性质,包括pH值、重金属浸出潜力、碳酸盐矿物含量、质地、体积密度和持水量。还将确定污水处理厂生物固体提供的额外中和能力和减少重金属浸出,这是一种常见的有机土壤改良剂,用于帮助重新植被硫酸盐中和的赤泥。不同的红泥灰比,二氧化碳浓度,和有机修正剂浓度将被用来确定哪一个比例提供最佳的土壤特性的植被。最后,将对实施这一技术的工程方案进行评估,以便在第二阶段进行实地示范。该项目将提供新的方法,用于中和赤泥,一种来自铝土矿开采的高容量,高碱性残留物,以及其他高容量废物(二氧化碳,酸性粉煤灰,生物固体)。对赤泥的处理将使美国和其他地方的大型赤泥处置区的植被重建和环境恢复成为可能。为此目的,二氧化碳、粉煤灰和生物固体的有益使用将降低几个行业对环境的影响。在赤泥中和中存在使用数百万吨二氧化碳或粉煤灰的潜力,而不是排放到大气中或分别在垃圾填埋场中处置。铝冶炼每年排放的二氧化碳中,有785%可能在目前储存的赤泥中和过程中被封存。该项目还将为可持续环境管理领域的研究生和本科生提供独特的培训机会。
项目成果
期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
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Gregory Lowry其他文献
Gregory Lowry的其他文献
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{{ truncateString('Gregory Lowry', 18)}}的其他基金
Workshop to Identify Convergent Nanotechnology Approaches for Precision Delivery of Active Agents in Plants
确定在植物中精确递送活性剂的融合纳米技术方法的研讨会
- 批准号:
2222373 - 财政年份:2022
- 资助金额:
$ 10万 - 项目类别:
Standard Grant
ECO-CBET: Foliar applied plant-activated nitrogen delivery agents for sustainable crop production.
ECO-CBET:叶面喷施植物活性氮输送剂,实现可持续作物生产。
- 批准号:
2133568 - 财政年份:2021
- 资助金额:
$ 10万 - 项目类别:
Continuing Grant
Collaborative Research: Elucidating nanoparticle-plant leaf interactions for designing foliar-applied agrochemicals
合作研究:阐明纳米粒子与植物叶子的相互作用,以设计叶面施用的农用化学品
- 批准号:
1911820 - 财政年份:2019
- 资助金额:
$ 10万 - 项目类别:
Standard Grant
2015 Sustainable Nanotechnology Organization (SNO) Conference; Portland, Oregon; November 8 - 10, 2015
2015年可持续纳米技术组织(SNO)会议;
- 批准号:
1548199 - 财政年份:2015
- 资助金额:
$ 10万 - 项目类别:
Standard Grant
Collaborative Research: NanoFARM (Fate and effects of agriculturally relevant materials)
合作研究:NanoFARM(农业相关材料的命运和影响)
- 批准号:
1530563 - 财政年份:2015
- 资助金额:
$ 10万 - 项目类别:
Standard Grant
FEW: Workshop to Identify Opportunities and Challenges for Nanotechnology to Optimize and Unify Food, Energy and Water Systems
FEW:确定纳米技术优化和统一食品、能源和水系统的机遇和挑战的研讨会
- 批准号:
1541807 - 财政年份:2015
- 资助金额:
$ 10万 - 项目类别:
Standard Grant
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