Download or read book Heavy Metals Removal from Metal Finishing Wastewater by Using Fly Ash and Bottom Ash written by Sukhothai Tejavanija and published by . This book was released on 2002 with total page 426 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book REMOVAL OF HEAVY METALS IN WASTE WATER BY USING COAL FLY ASH written by and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In this research, it is aimed to remove toxic heavy metals in waste water with the help of fly ash from Çayýrhan thermal power plant. The chemical and physical properties (size distribution, specific surface area, porosity, chemical composition, etc.) of fly ash were determined. The experiments were carried out in synthetic waste water containing lead, zinc and copper metals at different concentrations with the addition of fly ash. The effects of metal concentration, agitation time, particle size, ash amount, and pH in the metal removal were examined. With the addition of even very small amount of fly ash, heavy metal removal from waste water was attained at up to 99%. Fly ash particle size has no significant effect on removal of heavy metal ions from solutions. Higher solution pH and longer treatment time were resulted better metal removal. The results also indicated that the main mechanism for metal removal was precipitation due to alkaline characteristics of fly ash and more than 90 % of metals in solutions were removed by precipitation. The pH ranges for maximum metal precipitation were 10-11, 8-10, and 10-11 for copper, zinc, and lead respectively. Very small percentages of adsorbed metal was released during the desorption test.

Download or read book Coal Fly Ash Beneficiation written by Segun Akinyemi and published by BoD – Books on Demand. This book was released on 2018-01-31 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt: The present book deals with various, very significant topics of coal fly ash beneficiation, such as treatment of acid mine drainage with coal fly ash, toxic metal adsorption using coal fly ash, recovery of metals from coal fly ash and phytoreclamation of abandoned acid mine drainage site after treatment with coal fly ash, the status of research in coal fly ash utilization and applications and some other related topics in this growing and increasingly important research area. Overall, coal fly ash beneficiation has come to assume an important role in most areas of waste management research today. Continued growth and emphasis on scientific research is expected in all areas of waste management and conversion of waste to wealth technologies.

Download or read book The Use of Fly Ash for the Removal of Heavy Metals from Water written by David Craig Markey and published by . This book was released on 1972 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Removal of Heavy Metals by Fly Ash written by Chih-Huang Weng and published by . This book was released on 1990 with total page 318 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Removal of Toxic Metals from Metal Finishing Wastewater by Solvent Extraction written by Curtis W. McDonald and published by . This book was released on 1978 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Removal of Heavy Metals from Municipal Solid Waste Incinerator Fly Ash by an Electrodialytic Process written by Célia Maria Dias Ferreira and published by . This book was released on 2005 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Utilization of Coal Fly Ash and Grape Waste to Remove Toxic Metal Ions in Mining Waste Waters written by Emmanuel Appiah-Hagan and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In recent years, the studies of a variety of inexpensive adsorbents as alternative to the expensive activated carbon have received a lot of attention. The purpose of my research was primarily focused on the modification of Thunder Bay coal fly ash, the characterization of the pristine and modified fly ash and the application of modified fly ash for removal of metal ions from mine wastewater. Adsorption by grape wine material (GWM) was also investigated though not completed. Modification at low and elevated temperatures with 2.0 M NaOH yielded improvement in surface area, pore volume and cation exchange capacity. However, low-temperature modification was pursued leading to very efficient adsorbents named TBRM and TBFZ compared to the original fly ash named TB. The modified and unmodified fly ash was characterized using different techniques including ICP-OES, X-ray diffraction, specific surface analysis (Brunauer-Emmet- Teller), particle size distribution analysis and scanning electron microscopy. Surface area analysis revealed an increase of specific surface area from 1.24 (TB) to 64.34 (TBRM) and 68.98 (TBFZ) m2/g, respectively. Likewise, porosity was also induced in the modified fly ash. Cation exchange capacities were determined as 1.94, 23.48 and 29.23 meq/g for TB, TBRM and TBFZ, respectively. SEM-EDS and XPS were employed to confirm the adsorption of metal cations on the surface of the adsorbents. The performance of TBRM and TBFZ for the removal of Cu2+, Pb2+, Ni2+, Cr3+, Co2+ and Cd2+ from a synthetic cocktail solution (SCS) and tailing pond water (TPW) was compared to that of TB. Results indicated TBRM and TBFZ were more efficient in both SCS and TPW. A batch method was used to study the influential parameters of the adsorption process including contact time, pH effect, and kinetics and adsorption isotherms. Column studies were done to compliment the batch mode approach. Regeneration of TBFZ revealed a possible 3-cycle application. The equilibrium data were generally modeled by the Langmuir and Freundlich models. Also, the pseudo-second order model was found to explain the adsorption kinetics most effectively. Thermodynamic studies of Ni2+ and Cu2+ with TBFZ in SCS revealed that the adsorption process was spontaneous although endothermic with a decrease in entropy. The most efficient adsorbent TBFZ was converted into innovative concrete foam composite material TBFZ:FA:BA 0.22:0.33:0.45, for adsorption studies. Preliminary studies revealed a removal of more than 95 % of Cu2+, Pb2+, Ni2+, Cr3+, Co2+ and Cd2 in both SCS and TPW after 6 h of contact. However, the regeneration of TBFZ:FA:BA 0.22:0.33:0.45 was inefficient and further investigation ought to be carried out. Overall, the results indicate a significant potential of the modified Thunder Bay fly ash as an inexpensive and effective adsorbent for the removal of toxic metals from mine wastewater.

Download or read book Contamination of Groundwater by Heavy Metals from the Land Disposal of Fly Ash Technical Progress Report June 1 1977 March 31 1978 written by and published by . This book was released on 1978 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A study has been undertaken on a specific ponded fly ash disposal site to determine the degree of subsurface leaching of various ionic forms, especially heavy metals. The location is the site of the Michigan City generating station of the Northern Indiana Public Service Company, Michigan City, Indiana. The present ash ponding system consists of two primary ash ponds (volume of each 16.5 million gallons) which are loaded alternately, i.e., when one is in service the other is allowed to dry for the removal operation. The ash is sluiced to the ponds in a concentrated slurry. After primary and secondary settling the water is brought back for further ash sluicing. A constant elevation is maintained in the ponds at approximately 31.5 feet above the surface of Lake Michigan. The system cannot be considered closed because of losses due to evaporation and subsurface leaching. The station produces 340 to 400 tons of fly ash per day when operating at full capacity. A typical pond cycle requires six to nine months between removal periods. Observation wells were installed at various locations. Typically, the chemical composition of the groundwater varied with both time in the pond cycle as well as distance from the pond. Heavy metal concentrations decreased rapidly from the rather high levels found in the pond but a smaller peak concentration occurred some 100 meters from the pond after which the concentration decreased to rather low levels. The dominant mechanisms of attenuation are adsorption of metals onto hydrous oxides of iron and manganese and precipitation of various solid phases.

Download or read book Contamination of Groundwater by Heavy Metals from the Land Disposal of Fly Ash Final Report written by and published by . This book was released on 1979 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Information is provided on laboratory and field research to assess the aquatic effects and extent of release, migration, and attenuation of trace metals from fly ash into subsurface soil environments for a typical disposal regime. Those metals analyzed were arsenic, cadmium, chromium, copper, lead, mercury, nickel, and zinc. Laboratory studies indicated that the major effects of fly ash in water were pH alterations, which could be either acidic or basic, and comparatively high proportions of trace metals released from the ash surface, controlled largely by pH. Field studies confirmed the continued importance of pH in defining the attenuation of the metals by the soil but also suggested that pSO4, ionic strength, and soil chemical parameters, such as iron and manganese content, could not be ignored. Theoretical thermodynamic analysis in concert with field data indicated that both adsorption onto soil phases and precipitation of metal phases occurred, the dominant attenuation mechanism depending upon the specific metal and soil conditions.

Download or read book The Effect of the Heavy Metal Immobilization Agents on the Strength of Fly Ash Treated Soils and the Long term Stability of the Agents written by Shahid Rehman and published by . This book was released on 2014 with total page 74 pages. Available in PDF, EPUB and Kindle. Book excerpt: In United States, a large amount of electricity is produced by the burning of coal in power plants produce an immense amount of ash (bottom and fly ash) each year. Fly ash contains hazardous or toxic materials such as heavy metals. If without appropriate treatments, before dumping fly ash in land-fills, heavy metals may leach from the fly ash and contaminate the ground water. This study describes the laboratory evaluation of the effects of the heavy metal immobilization agent on the strength of fly ash treated soil and the long term stability of the immobilization agent. Ethylenediaminetetraacetic acid (EDTA) and Triple Super Phosphate (TSP) were used as immobilization agents and mixed at different ratios, ranging from 0 % to 6 %, with fly ash to check the effect on geotechnical properties of fly ash and long-term resistance to heavy metals found in fly ash. Two types of fly ash, Class C and Class F were mixed with different dosage of TSP (0 % to 6 %) and EDTA (0 % to 1 %) at optimum moisture contents (OMC) to achieve a compacted structural fills. The geotechnical properties of the samples were tested by means of unconfined compressive strength (ASTM-D2166/D2166M-13) at curing periods of 7, 14 and 28 days and for the long-term stability of the agents were tested by the means of standard test method for leaching solid material in a column apparatus (ASTM-D4874-95). For fly ash Class C, adding either EDTA or TSP decreased the fly ash's compressive strength. At 28 days, the average peak compressive strength of the cured fly ash specimens was 1549 kPa. EDTA lowered the compressive strength to 958 from 1549 kPa, while TSP lowered the compressive strength to 950 from 1549 kPa. Fly ash only gives a max compressive strength because of its cementious nature. For fly ash Class F, EDTA did not noticeably affect on the compressive strength of the fly ash, but TSP increased the strength. When TSP was added to fly ash, it showed increase from 58 (fly ash only) to 161 kPa. To immobilize the heavy metal from fly ash, it is recommended to use TSP as chelating agent to achieve the maximum compressive strength. TSP showing the same compressive strength compared to EDTA at 28 days curing time and TSP is very cheap compared to EDTA. For long-term stability of the immobilization agent used with fly ash Class C, it was founded that TSP worked well for almost all of the heavy metals except As. EDTA also showed good immobilization to heavy metals except Hg and Pb. For fly ash Class F, TSP showed better results for the stabilization of Hg and Pb and worst towards As. Addition of EDTA enhanced the stabilization of Cd, Cr, Zn, and As. EDTA gave good response to some metals and TSP gave well to others. The combination of EDTA and TSP showed excellent results towards immobilization of the metals.

Download or read book Analysis of Heavy Metal in Bottom Ash and Fly Ash After the Incineration of Batteries and Wee written by Paula Elena Rojas Labanda and published by . This book was released on 2008 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Wealth from Waste written by A.K. Shrivastava and published by APH Publishing. This book was released on 2003 with total page 404 pages. Available in PDF, EPUB and Kindle. Book excerpt: This Book Is A Authentic Guide To Those Authorities/Enterpreneurs Who Want To Develop An Understanding Of Innovative Waste Recycling Procedure.

Download or read book Selected Water Resources Abstracts written by and published by . This book was released on 1989 with total page 830 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Behaviour of Metals in MSW Incinerator Fly Ash During Roasting with Chlorinating Agents written by Chris Chi-Yet Chan and published by . This book was released on 1997 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: A process for removal of heavy metals from municipal solid waste (MSW) incinerator fly ash was studied on a laboratory scale. The process is characterized by the formation of volatile chlorides of heavy metals during thermal treatment at temperatures from 600$\sp\circ$C to 1050$\sp\circ$C. A quartz tube furnace was used for roasting the fly ash sample in an air stream with the presence of a chlorinating agent. Operational parameters, such as roasting temperature, roasting time, and types and quantities of chlorinating agents, were studied. The working conditions for volatilization of Pb, Cu, Zn and Cd, were established. This process not only recovers the valuable heavy metals from the fly ash, but also converts the fly ash from potentially hazardous into non-hazardous material for recycle or its safe disposal in a landfill. Material balances on the fly ash components revealed the metal contaminant distribution between the volatile matter and the ash residue. More acid resistant compounds were formed after the heat treatment. CaCl$\sb2$ was found to be a more selective chlorinating agent compared to Cl$\sb2$ for volatilizing the above heavy metals from a complex matrix such as fly ash. A linear relationship between the efficiencies of volatilization of the partially recovered metals and their standard free-energy changes for the chlorination reactions was indicated. Many of these chlorination reactions were found to be of first order. X-ray powder diffraction was used to identify various chemical compounds to confirm specific reaction mechanisms and to characterize the volatile matter and the heat-treated/untreated fly ash. The reason for the unexpected leachability of Cr and Al from the treated ash residue was investigated and resolved. The applicability of the results to other residues was determined. The techniques developed for the MSW fly ash were applied to a steel dust waste with success for removal of zinc and lead contaminants.

Download or read book Removal of Heavy Metals from Industrial Wastewaters Using Insoluble Starch Xanthate written by Robert E. Wing and published by . This book was released on 1978 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Leaching of Heavy Metals from Fly Ash Stabilized Soils written by Md Sazzad Bin-Shafique and published by . This book was released on 2002 with total page 340 pages. Available in PDF, EPUB and Kindle. Book excerpt: