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Commercial Demonstration of the Manufactured Aggregate Processing Technology Utilizing Spray Dryer Ash

Description: This quarterly report covers the period from April 1, 2005 through June 30, 2005. It covers: technical development, permitting status, engineering status, construction status, operations summary and marketing support activities for this period.
Date: August 5, 2005
Creator: Scandrol, Roy O.
Partner: UNT Libraries Government Documents Department

Energy and environmental (JSR) research emphasizing low-rank coal

Description: The products of plastic thermal depolymerization can be used for the manufacture of new plastics or various other hydrocarbon-based products. One thermal depolymerization development effort is ongoing at the Energy & Environmental Research Center (EERC) of the University of North Dakota, under joint sponsorship of the American Plastics Council, the 3M corporation, and the Department of Energy. Thermal depolymerization process development began at the EERC with a benchscale program that ran from 9/92 to 6/93 (1). Testing was conducted in a 1-4-lb/hr continuous fluid-bed reactor (CFBR) unit using individual virgin resins and resin blends and was intended to determine rough operating parameters and product yields and to identify product stream components. Process variables examined included temperature and bed material, with a lesser emphasis on gas fluidization velocity and feed material mix. The following work was performed: (1) a short program to determine the suitability of using CaO in a postreactor, fixed bed for chlorine remediation, (2) thermal depolymerization of postconsumer plastics, and (3) testing of industrial (3M) products and wastes to determine their suitability as feed to a thermal depolymerization process. The involvement of DOE in the development of the plastics thermal depolymerization process has helped to facilitate the transfer of coal conversion technology to a new and growing technology area -- waste conversion. These two technology areas are complementary. The application of known coal conversion technology has accelerated the development of plastics conversion technology, and findings from the plastics depolymerization process development, such as the development of chlorine remediation techniques and procedures for measurement of organically associated chlorine, can be applied to new generations of coal conversion processes.
Date: December 1, 1994
Creator: Sharp, L.L.
Partner: UNT Libraries Government Documents Department


Description: Effective operation of the multi-state Port ofNew York/New Jersey (Port), which contributes $20 billion to the regional economy and generates nearly 250,000 jobs, is dependent on yearly navigational dredging of several million m{sup 3} of sediment for channel maintenance and deepening. Further dredging is required for remediation of environmentally sensitive areas. However, more stringent ocean placement testing regulations in the Port region have necessitated a search for other means of handling the most contaminated dredged materials. Here, we describe a dredged material decontamination program for the Port aimed at the creation of sediment decontamination facilities that produce a beneficial use product to obviate the need for ocean placement. These facilities, to be a viable component of an overall dredged material management plan, must be environmentally balanced and economically feasible with the predictable ability to process large volumes of dredged materials with rapid turn-around. Our program recognizes that the responsible management of contaminated dredged materials is a complex problem that requires the effective application and coordination of a variety of cross-cutting skills to make decontamination facilities a reality. Participants do not come from a single agency, but are ad hoc teams of scientists, engineers, regulators, port authorities and operators, technology development firms, federal/state/local governments, business interests and community groups, among others, who are brought together by the need to solve the complex problem of managing dredged material in the Port region.
Date: May 1, 2002
Partner: UNT Libraries Government Documents Department


Description: Based upon the previous Phase I research program aimed at looking for ways of recycling the KeySpan-generated wastes, such as waste water treatment sludge (WWTS) and bottom ash (BA), into the potentially useful cementitious materials called chemically bonded cement (CBC) materials, the emphasis of this Phase II program done at Brookhaven National Laboratory, in a period of September 1998 through July 1999, was directed towards the two major subjects: One was to assess the technical feasibility of WWTS-based CBC material for use as Pb-exchange adsorbent (PEA) which remediates Pb-contaminated soils in the field; and the other was related to the establishment of the optimum-packaging storage system of dry BA-based CBC components that make it a promising matrix material for the steam-cured concrete products containing sand and coarse aggregate. To achieve the goal of the first subject, a small-scale field demonstration test was carried out. Using the PEA material consisting of 30 wt% WWTS, 13 wt% Type I cement and 57 wt% water, the PES slurry was prepared using a rotary shear concrete mixer, and then poured on the Pb-contaminated soil. The PEA-to-soil ratio by weight was a factor of 2.0. The placed PEA slurry was blended with soil using hand mixing tools such as claws and shovels. The wettability of soils with the PEA was very good, thereby facilitating the soil-PEA mix procedures. A very promising result was obtained from this field test; in fact, the mount of Pb leached out from the 25-day-aged PEA-treated soil specimen was only 0.74 mg/l, meeting the requirement for EPA safe regulation of < 5 mg/l. In contrast, a large amount (26.4 mg/l) of Pb was detected from the untreated soil of the same age. Thus, this finding demonstrated that the WWTS-based CBC has a potential for use as PEA material. Regarding the second ...
Date: August 1, 1999
Partner: UNT Libraries Government Documents Department

Scrap tire recycling

Description: As the automobile tire technology has grown and met the need for safer and more durable tires, stronger reinforcement and more chemically resistant rubber compounds have made recycling tires more difficult. In an effort to resolve this problem, techniques and equipment were developed to grind tires into small pieces, and new markets were sought to utilize the crumb rubber product streams from ground tires. Industrial combustion processes were modified to accept scrap tires as fuel. These efforts have been beneficial, steadily increasing the percentage of scrap tires recycled to about 10% in 1985, and reaching 72% in 1995. By the end of 1997, fully 100% of tires generated in the U.S. are expected to be recycled.
Date: March 1, 1997
Creator: Lula, J.W. & Bohnert, G.W.
Partner: UNT Libraries Government Documents Department

Comprehensive guideline for procurement of products containing recovered materials. Effective date: May 1, 1996

Description: In Section 6002 of the Resource Conservation and Recovery Act (RCRA) Congress acknowledges the importance of recycling by mandating that government agencies increase their purchases of products containing recovered materials (i.e., waste materials and by-products that have been recovered or diverted from solid waste, not including materials and by-products generated from and commonly reused within an original manufacturing process). To further that mandate, RCRA specifies that the Environmental Protection Agency (EPA) develop and issue procurement guidelines that designate specific items that are or can be made with recovered materials, and recommend practices with respect to the procurement of recovered materials and items containing such materials. Procuring agencies (Federal, State, and agencies of political subdivisions of States that use appropriated Federal funds) and their contractors are required to buy designated items with the highest recovered material content practicable. This Regulatory Bulletin describes the first Comprehensive Procurement Guideline (CPG) (with 19 newly designated items) and Recovered Materials Advisory Notices (RMANs) (with recommendations for purchasing the items) developed by EPA using this new process.
Date: January 1, 1996
Partner: UNT Libraries Government Documents Department

Market assessment of PFBC ash use

Description: Pressurized fluidized bed combustion (PFBC) of coal is undergoing demonstration in the United States, as well as throughout the world. American Electric Power`s (AEP`s) bubbling PFBC 70 MWe Tidd demonstration program in Ohio and pilot-scale development at Foster Wheeler Energia Oy 10 MWth circulating PFBC at Karhula, Finland, have demonstrated the advantages of PFBC technology. Further technology development in the US is planned with the deployment of the technology at the MacIntosh Clean Coal project in Lakeland, Florida. Development of uses for solid wastes from PFBC coal-fired power systems is being actively pursued as part of the demonstration of PFBC technologies. Ashes collected from Foster Wheeler Energia Oy pilot circulating PFBC tests in Karhula, Finland, operating on (1) low sulfur subbituminous and (2) high sulfur bituminous coal; and ash from the AEP`s high-sulfur bituminous coal-fired bubbling PFBC in Brilliant, Ohio, were evaluated in laboratory and pilot-scale ash use testing at Western Research Institute (WRI).
Date: January 1, 1998
Creator: Bland, A. E. & Brown, T. H., Western Research Institute
Partner: UNT Libraries Government Documents Department

[Energy and environmental research emphasizing low-rank coal]: Task 5. 8, Development of a coal by-product classification protocol for utilization. Topical report, January--September 1995

Description: The scope of work for this task was limited to the development of a general process to evaluate coal fly ash for use in applications beyond cement and concrete. Two coal fly ash samples were evaluated for appropriateness in structural fill as an example of how to use alternative classification protocol as ash use standards are developed for the industry. The goal of this project is to develop a classification system for fly ash based on parameters that relate to performance specification of engineering and construction applications. The new classification system will provide a means of evaluating the suitability of coal ash for use in certain products that currently have no reality-based standards or classifications. Recent work by the American Society for Testing and Materials (ASTM) Committee E50 on Pollution Prevention has proposed a standard practice for use of coal ash for structural fill applications. Energy & Environmental Research Center (EERC) coal ash researchers have worked on preparing this standard practice, and the development of criteria for the coal ash to be used in this application will facilitate the use of this standard once approved by ASTM. A preliminary flowchart for classification criteria was developed and is shown in figure 1.
Date: October 1, 1995
Creator: Dockter, B.A. & Pflughoeft-Hassett, D.F.
Partner: UNT Libraries Government Documents Department

Advanced technologies for decontamination and conversion of scrap metal

Description: In October 1993, Manufacturing Sciences Corporation was awarded DOE contract DE-AC21-93MC30170 to develop and test recycling of radioactive scrap metal (RSM) to high value and intermediate and final product forms. This work was conducted to help solve the problems associated with decontamination and reuse of the diffusion plant barrier nickel and other radioactively contaminated scrap metals present in the diffusion plants. Options available for disposition of the nickel include decontamination and subsequent release or recycled product manufacture for restricted end use. Both of these options are evaluated during the course of this research effort. work during phase I of this project successfully demonstrated the ability to make stainless steel from barrier nickel feed. This paved the way for restricted end use products made from stainless steel. Also, after repeated trials and studies, the inducto-slag nickel decontamination process was eliminated as a suitable alternative. Electro-refining appeared to be a promising technology for decontamination of the diffusion plant barrier material. Goals for phase II included conducting experiments to facilitate the development of an electro-refining process to separate technetium from nickel. In parallel with those activities, phase II efforts were to include the development of the necessary processes to make useful products from radioactive scrap metal. Nickel from the diffusion plants as well as stainless steel and carbon steel could be used as feed material for these products.
Date: December 31, 1996
Creator: MacNair, V.; Muth, T.; Shasteen, K.; Liby, A.; Hradil, G. & Mishra, B.
Partner: UNT Libraries Government Documents Department

Production of ethanol from refinery waste gases. Phase 2, technology development, annual report

Description: Oil refineries discharge large volumes of H{sub 2}, CO, and CO{sub 2} from cracking, coking, and hydrotreating operations. This program seeks to develop a biological process for converting these waste gases into ethanol, which can be blended with gasoline to reduce emissions. Production of ethanol from all 194 US refineries would save 450 billion BTU annually, would reduce crude oil imports by 110 million barrels/year and emissions by 19 million tons/year. Phase II efforts has yielded at least 3 cultures (Clostridium ljungdahlii, Isolate O-52, Isolate C-01) which are able to produce commercially viable concentrations of ethanol from CO, CO{sub 2}, and H{sub 2} in petroleum waste gas. Single continuous stirred tank reactor studies have shown that 15-20 g/L of ethanol can be produced, with less than 5 g/L acetic acid byproduct. Culture and reactor optimization in Phase III should yield even higher ethanol concentrations and minimal acetic acid. Product recovery studies showed that ethanol is best recovered in a multi-step process involving solvent extraction/distillation to azeotrope/azeotropic distillation or pervaporation, or direct distillation to the azeotrope/azeotropic distillation or pervaporation. Projections show that the ethanol facility for a typical refinery would require an investment of about $30 million, which would be returned in less than 2 years.
Date: July 1, 1995
Creator: Arora, D.; Basu, R.; Phillips, J.R.; Wikstrom, C.V.; Clausen, E.C. & Gaddy, J.L.
Partner: UNT Libraries Government Documents Department

Sustainable biomass products development and evaluation, Hamakua project. Final draft report

Description: The PICHTR Sustainable Biomass Energy Program was developed to evaluate the potential to cultivate crops for energy production as an alternative use of lands made available by the closing of large sugar plantations. In particular, the closing of the Hamakua Sugar Company on the island of Hawaii brought a great deal of attention to the future of agriculture in this region and in the state. Many options were proposed. Several promising alternatives had been proposed for cane lands. These included dedicated feedstock supply systems (DFSS) for electrical energy production, cultivation of sugarcane to produce ethanol and related by-products, and the production of feed and crops to support animal agriculture. Implementation of some of the options might require preservation of large tracts of land and maintenance of the sugar mills and sugar infrastructure. An analysis of the technical, financial, and other issues necessary to reach conclusions regarding the optimal use of these lands was required. At the request of the Office of State Planning and Senator Akaka`s office, the Pacific International Center for High Technology Research (PICHTR) established and coordinated a working group composed of state, county, federal, and private sector representatives to identify sustainable energy options for the use of idle sugar lands on the island of Hawaii. The Sustainable Biomass Energy Program`s Hamakua Project was established to complete a comprehensive evaluation of the most viable alternatives and assess the options to grow crops as a source of raw materials for the production of transportation fuel and/or electricity on the island of Hawaii. The motivation for evaluating biomass to energy conversion embraced the considerations that Hawaii`s energy security would be improved by diversifying the fuels used for transportation and reducing dependency on imported fossil fuels. The use of waste products as feedstocks could divert wastes from landfills.
Date: May 1998
Partner: UNT Libraries Government Documents Department

Processing electric arc furnace dust into saleable chemical products

Description: The modern steel industry uses electric arc furnace (EAF) technology to manufacture steel. A major drawback of this technology is the production of EAF dust, which is listed by the U.S. Environmental Protection Agency as a hazardous waste under the Resource Conservation and Recovery Act. The annual disposal of approximately 0.65 million tons of EAF dust in the United States and Canada is an expensive, unresolved problem for the steel industry. EAF dust byproducts are generated during the manufacturing process by a variety of mechanisms. The dust consists of various metals (e.g., zinc, lead, cadmium) that occur as vapors at 1,600{degrees}C (EAF hearth temperature); these vapors are condensed and collected in a baghouse. The production of one ton of steel will generate approximately 25 pounds of EAF dust as a byproduct, which is currently disposed of in landfills.
Date: April 1, 1998
Partner: UNT Libraries Government Documents Department

Land application uses for dry FGD by-products. Third quarterly report, 1995

Description: The primary purpose of this report is to create beneficial reuse standards for coal ash and clean coal technology by-products. One of the highlights of the report is the benefits of FGD by-products for agriculture. Alfalfa growth and yields have been better this year than any other year. The report provides a brief information on study of FGD benefits for neutralizing acid mine spoil or coal refuse. Chemical Speciation models were conducted to improve our understanding of the impact of FGD on soil, water and plant quality.
Date: July 1, 1997
Partner: UNT Libraries Government Documents Department

Heavy oil/plastic co-processing - subtask 4.1. Topical report, February 1, 1994--February 1, 1995

Description: Western Research Institute (WRI) is developing a low-temperature thermal decomposition process to alleviate the problems associated with disposal of waste plastics and at the same time generate a product stream in the gasoline boiling range for use in the refining and petrochemical industries. The technology being developed by WRI is significantly different from conventional thermal decomposition processes used to recover distillates from waste plastics. The key to this difference is the application of a decomposition initiator concept that allows operation of the process at temperatures below those used in other thermal decomposition processes. The WRI technology utilizes the decomposition initiator to enhance thermal decomposition of waste plastics in the presence of a low-value heavy oil at temperatures below those normally used for thermal decomposition. Operation of the process at lower temperatures produces higher yields of distillate product and lower yields of gaseous and char products than conventional processes. The activity of the initiator was identified in earlier research studying the thermal decomposition of polymers. This activity was observed to result in a decrease in the temperature required to thermally decompose plastics in the presence of a heavy oil. These early experiments indicated that the initiator was native to the plastics matrix, but the identity and possible mode of action were not determined. This study was undertaken to identify the active initiator in the plastics matrix and define its activity. The experiments performed in this study were conducted in a batch-type reactor. The particular elements of the activity that were addressed included: (1) the kinetics of the reaction, (2) the effects of diluting the plastics with the heavy oil, and (3) the effects of using different types of heavy oil.
Date: December 31, 1998
Partner: UNT Libraries Government Documents Department

Analysis of removal alternatives for the Heavy Water Components Test Reactor at the Savannah River Site. Revision 1

Description: This engineering study evaluates different alternatives for decontamination and decommissioning of the Heavy Water Components Test Reactor (HWCTR). Cooled and moderated with pressurized heavy water, this uranium-fueled nuclear reactor was designed to test fuel assemblies for heavy water power reactors. It was operated for this purpose from march of 1962 until December of 1964. Four alternatives studied in detail include: (1) dismantlement, in which all radioactive and hazardous contaminants would be removed, the containment dome dismantled and the property restored to a condition similar to its original preconstruction state; (2) partial dismantlement and interim safe storage, where radioactive equipment except for the reactor vessel and steam generators would be removed, along with hazardous materials, and the building sealed with remote monitoring equipment in place to permit limited inspections at five-year intervals; (3) conversion for beneficial reuse, in which most radioactive equipment and hazardous materials would be removed and the containment building converted to another use such as a storage facility for radioactive materials, and (4) entombment, which involves removing hazardous materials, filling the below-ground structure with concrete, removing the containment dome and pouring a concrete cap on the tomb. Also considered was safe storage, but this approach, which has, in effect, been followed for the past 30 years, did not warrant detailed evaluation. The four other alternatives were evaluate, taking into account factors such as potential effects on the environment, risks, effectiveness, ease of implementation and cost. The preferred alternative was determined to be dismantlement. This approach is recommended because it ranks highest in the comparative analysis, would serve as the best prototype for the site reactor decommissioning program and would be most compatible with site property reuse plans for the future.
Date: April 1, 1997
Creator: Owen, M.B.
Partner: UNT Libraries Government Documents Department

Task 6.4 -- The use of coal ash in ceramics. Semi-annual report, January 1--June 30, 1995

Description: Previous empirical tests at the Energy and Environmental Research Center (EERC) have indicated that coal combustion by-products are a viable starting material for the production of a variety of ceramic products, including brick, tile, and high-flexural-strength ceramics. The EERC has focused on high-temperature properties of coal ash and has provided valuable insight into ash transformation, fouling, and slagging for the utility industry. It is proposed to utilize the information generated in these past projects to develop material selection criteria and product manufacturing techniques based on scientific and engineering characteristics of the ash. Commercialization of the use of coal combustion by-products in ceramics is more likely to become viable if a quality-assured product can be made, and predictive materials selection is a key component of a quality-assured product. The objective of this task is to demonstrate the development and production of a ceramic material using coal ash as a key component. Chemical and high-temperature properties of ash will be carefully determined, with the objective of identifying criteria for materials selection and manufacturing options for ceramic production.
Date: December 31, 1995
Creator: Pflughoeft-Hassett, D.F.
Partner: UNT Libraries Government Documents Department

Characterization summary of candidate off-specification material for transfer to the Tennessee Valley Authority

Description: The United States Enrichment Corporation (USEC) Privatization Act provides that, prior to privatization, the Department of Energy (DOE) may transfer off-specification (off-spec) enriched uranium to a federal agency if the material is transferred for the use of the receiving agency without resale or subsequent transfer to another entity. The Tennessee Valley Authority (TVA) has expressed an interest in obtaining some of this off-spec surplus highly enriched uranium (HEU) for the purpose of making fuel for its reactors. Discussions between DOE and TVA over the past two years have resulted in a framework between DOE and TVA within which to develop a program for the utilization of HEU blended to off-spec low-enriched uranium (LEU) for use in TVA commercial nuclear power reactors. A minimum of 30 metric tons uranium (t) of HEU has been designated for this program. DOE has identified material amounting to approximately 35 t that potentially will be transferred to TVA. This report describes four types of HEU that has been identified by the DOE.
Date: January 1, 1998
Partner: UNT Libraries Government Documents Department

Sediment Decontamination Treatment Train: Commercial-Scale Demonstration for the Port of New York/New Jersey

Description: Decontamination and beneficial use of dredged material is a component of a comprehensive Dredged Material Management Plan for the Port of New York and New Jersey. The authors describe here a regional contaminated sediment decontamination program that is being implemented to meet the needs of the Port. The components of the train include: (1) dredging and preliminary physical processing (materials handling), (2) decontamination treatment, (3) beneficial use, and (4) public outreach. Several types of treatment technologies suitable for use with varying levels of sediment contamination have been selected based on the results of bench- and pilot-scale tests. This work is being conducted under the auspices of the Water Resources Development Act (WRDA). The use of sediment washing is suitable for sediments with low to moderate contamination levels, typical of industrialized waterways. BioGenesis Enterprises and Roy F. Weston, Inc. performed the first phase of an incremental decontamination demonstration with the goal of decontaminating 700 cubic yards (cy) (pilot-scale) for engineering design and cost economics information for commercial scale operations. This pilot test was completed in March, 1999. The next phase will scale-up to operation of a commercial facility capable of treating 40 cy/hr. It is anticipated that this will be completed by January 2000 (250,000 cy/yr). Manufactured topsoil is one beneficial use product from this process. Tests of two high-temperature treatment technologies are also in progress. They are well suited to produce almost complete destruction of organic compounds in moderate to highly contaminated dredged materials and for production of high-value beneficial reuse products. The Institute of Gas Technology is demonstrating a natural gas-fired thermochemical manufacturing process with an initial treatment capacity of 30,000 cy/yr into operation by the fall of 1999. Design and construction of a 100,000 cy/yr facility will be based on the operational results obtained from the demonstration facility. ...
Date: July 1, 1999
Creator: Jones, K. W.; Stern, E. A.; Donato, K. R. & Clesceri, N. L.
Partner: UNT Libraries Government Documents Department

Gunite and associated tanks remediation project recycling and waste minimization effort

Description: The Department of Energy`s Environmental Management Program at Oak Ridge National Laboratory has initiated clean up of legacy waste resulting from the Manhattan Project. The gunite and associated tanks project has taken an active pollution prevention role by successfully recycling eight tons of scrap metal, reusing contaminated soil in the Area of Contamination, using existing water (supernate) to aid in sludge transfer, and by minimizing and reusing personal protective equipment (PPE) and on-site equipment as much as possible. Total cost savings for Fiscal Year 1997 activities from these efforts are estimated at $4.2 million dollars.
Date: May 1, 1998
Creator: Van Hoesen, S.D. & Saunders, A.D.
Partner: UNT Libraries Government Documents Department

Treatment of metal-laden hazardous wastes with advanced Clean Coal Technology by-products

Description: This eleventh quarterly report describes work done during the eleventh three-month period of the University of Pittsburgh's project on the ``Treatment of Metal-Laden Hazardous Wastes with Advanced Clean Coal Technology By-Products.'' This report describes the activities of the project team during the reporting period. The principal work has focused upon new laboratory evaluation of samples from Phase 1, discussions with MAX Environmental Technologies, Inc., on the field work of Phase 2, preparing and giving presentations, and making and responding to two outside contacts.
Date: April 5, 1999
Creator: James T. Cobb, Jr.; Neufeld, Ronald D.; Agostini, Jana & Elder, Wiles
Partner: UNT Libraries Government Documents Department

Using Flue Gas Huff 'n Puff Technology and Surfactants to Increase Oil Production from the Antelope Shale Formation of the Railroad Gap Oil Field

Description: This project was designed to test cyclic injection of exhaust flue gas from compressors located in the field to stimulate production from Antelope Shale zone producers. Approximately 17,000 m{sup 3} ({+-}600 MCF) of flue gas was to be injected into each of three wells over a three-week period, followed by close monitoring of production for response. Flue gas injection on one of the wells would be supplemented with a surfactant.
Date: December 18, 2001
Creator: McWilliams, Michael
Partner: UNT Libraries Government Documents Department


Description: We propose a process that uses sulfur dioxide from coal combustion as a raw material to synthesize polymeric ferric sulfate (PFS), a water treatment agent. The process uses sodium chlorate as an oxidant and ferrous sulfate as an absorbent. The major chemical mechanisms in this reaction system include oxidation, hydrolysis, and polymerization. Oxidation determines sulfur conversion efficiency while hydrolysis and polymerization control the quality of product. Many factors, including SO{sub 2} inlet concentration, flow rate of simulated flue gas, reaction temperature, addition rate of oxidant and stirring rate, may affect the efficiencies of SO{sub 2} removal. Currently, the effects of SO{sub 2} inlet concentration, the flow rate of simulated flue gas and addition rate of flue gas on removal efficiencies of SO{sub 2}, are being investigated. Experiments shown in this report have demonstrated that the conversion efficiencies of sulfur dioxide with ferrous sulfate as an absorbent are in the range of 60-80% under the adopted process conditions. However, the conversion efficiency of sulfur dioxide may be improved by optimizing reaction conditions to be investigated. Partial quality indices of the synthesized products, including Fe{sup 2+} concentration and total iron concentration, have been evaluated.
Date: December 1, 2001
Creator: Brown, Robert C. & Fan, Maohong
Partner: UNT Libraries Government Documents Department