Heavy metal contamination of wastewaters is a growing concern now a days. Conventional biological treatment of industrial discharges cannot be a success unless these metals of concern are removed prior to secondary treatment. Hence there is a dire need to devise a treatment which not only is efficient but also cost effective. Biosorption proved to be a promising alternative among many treatment technologies for removing heavy metals from wastewater. Agricultural residues being waste of farms and agricultural land can be potential adsorbents for removing these metals of concern. This book aimed the investigation of copper and lead removal using agricultural residues like rice husk and wheat straw.
Soap can remove water hardness ions (calcium and magnesium) from hard water in the form of insoluble ‘lime soaps’. Might it also form heavy metal soaps when added to an aqueous dispersion of contaminated soil? Some researchers have studied the use of soap to remediate wastewaters contaminated with heavy metals, but there has been no work carried out on using it to wash them out of soil. This work shows that by carefully controlling the pH and temperature of the soapy wash water it is possible to form the heavy metal soaps. These soaps are insoluble in water and float to the surface where they can be skimmed off. This therefore provides a new, very simple, cost effective method of remediating soils contaminated with heavy metals. Whilst the results to date hold much promise there is still a significant amount of work that needs to be carried out to optimise the process; this work will hopefully stimulate further research in this important field.
Donovan ?protection? Of Metals From Corrosion In Storage And Transit
Traditional hydrometallurgical approaches for the metals recovery use the different leaching agents: halides, cyanide, thiocyanate, thiourea, thiosulfate, polythionates, and leaching microorganisms. Polythionates are very effective but their industrial application showed some problems / limitations. The monograph describes formation of polythionates of organic bases: they are in more effective for leaching and have no limitations of inorganic polythionates. The monograph presents the new general theory of the organic base polythionates formation. The new theory explains all experimental data published in the affiliated chemical and hydrometallurgical literature. In whole, the monograph is intended for chemists and microbiologists working in the field of hydrometallurgy.
In the present book, an attempt has been made to remove heavy metals like copper and nickel from textile waste water in industries and how this waste water can be reused. Ion exchange and batch adsorption method is the solution of heavy metals removal from waste water and can often use and easy to investigate the result in laboratory and industries. Electroplating waste water from different electroplating industries of Ahmadabad region(India) have been selected. The modified bioadsorbent have been selected for the removal of metals. Different Parameters has been investigated intensively.Standard parameters can be developed for column chromatography to remove some heavy metals from industrial waste water and can make filter plantation for metals removal from waste effluent. Thus it may be possible to reuse for industrial purpose or other domestic uses. If we can remove them really, it will major help for survival of green and clean earth. It also concluded that this type of plants can be established for modification of some new bioadsorbent for the better recovery of heavy metals from industrial effluent to save environment and green globe.
I find the work very interesting and useful from the scientific point of view as well as social impact. Identification of E-waste and quantification of the same both at global level as well as Indian conditions, stressing the need to recycle in order to save precious metals and other valuables is timely and exemplary. The various crude backyard practices listed are frightening when considering the impact on human health and environment degradation. The dismantling of various electronic equipment, detailed step by step deserves commendation. The useful characterization data of the present study is sparsely available and hence forms a source for further studies. The recovery process for Metals, Plastics and Glass are dealt with and presented scientifically. They are brought out systematically and their usefulness is appropriately stressed. The Chapter 8 is very well brought out with the apt conclusions " The combination of both Environmental monitoring and health monitoring indicates that the recycling operations are carried out in satisfactory conditions". The work is note worthy in that direction. By Prof. Dr. Y.B.G. Varma, former HoD, Dept. of Chemical Engg, IIT, Chennai.
The removal of heavy metals from the wastewater is a matter of concern for many countries but is a key issue in developing countries like Pakistan. These heavy metals are of serious health and environmental concern and there is a need to discover new and effective methods for their removal from industrial effluents. Removal of Copper (Cu) and Nickel (Ni) from industrial wastewater was studied using metal oxide nanoparticles such as magnesium oxide (MgO) and zinc oxide (ZnO). The metal oxide nanoparticles provide high adsorption capacity, simple operation and rapid adsorption.
Sewage sludge could be used as organic fertilizer and source for nutrients in soil. Sludge always contain toxic substances especially heavy metals. When applied to land heavy metals can accumulate in the soil and produce harmful effects in animal and vegetation. A safe use of sewage sludge as soil conditioner requires sewage sludge with low heavy metal content. The removal of the heavy metals from sludge reduces prospective health risk during its application to land and accumulation in the food chain as well as persistence in nature. Microbial and chemical leaching using Thiobacillus thiooxidans and H2SO4 was investigated to solubilize heavy metals (HMs) from domestic sludge at different concentrations. Result obtained showed that 100% Cr was solubilized at 50 ml sludge concentration when the bioleached sludge was digested with 50% (v/v) H2SO4, while 90% Cr was also solubilized at same sludge concentration when the bioleached sludge wasn’t digested with H2SO4.The scientific community would benefit from this project since it has developed new methods for the removal and recovery of heavy metals from dilute solutions and their reduction to very low concentrations in sewage sludge.
This monograph is based on research work and several literature. Heavy metals, especially Nickel and Chromium can have serious effects on human and animal health and they are non-renewable resources. Therefore effective recovery of heavy metals is as important as removal of them from waste streams.The conventional methods may be ineffective or expensive, especially when the heavy metal ions are in solutions containing in the order of 1-100 mg dissolved heavy metal ions/L.The Calotropis procera and Embalica officinalis, plant biomasses were investigated as a new biosorbent for the removal of Ni(II) and Cr(VI) from aqueous solution with 90% and 100% sorption efficiency of Ni(II) and Cr(VI) from 50 mg/L solution. This study provides information on the removal of Cr(VI) and Ni(II) by using two different low cost adsorbents. Different parameters, adsorption isotherm and elution test, co-ions effects etc were studied.
Metal ion release from metallic materials, e.g. metallic alloys and pure metals, implanted into the human body in dental and orthopedic surgery are becoming a major cause for concern. This book briefly provides an overview of both metallic alloys and pure metals used in implant materials in dental and orthopedic surgery. Additionally, a short section is dedicated to important biomaterials and their corrosive behavior in both real solutions and various types of media that model human biological fluids and tissues. The present book gives an overview of analytical methods, techniques and different approaches applied to measurement of in vivo trace metals released into body fluids and tissues from patients carrying metal-on-metal prosthesis and metal dental implants. Reference levels of ion concentrations in body fluids and tissues that have been determined by a host of studies are compiled, reviewed and presented in this paper. Finally, a collection of published clinical data on in vivo released trace metals from metallic medical implants is included.
The tremendous increase in the use of heavy metal ions over the last few decades has inevitably resulted in an increased flux of metallic substances in the water resources. Presence of small amount of these metals in water resources poses unacceptable chronic and acute health risks due to their non-biodegradable and persistence in nature. Therefore, not only first generation is affected by heavy metal, but the affect also passes onto the second and third generations in terms of genetic abnormalities and birth defects. Heavy metals are toxic in both their organic and inorganic forms and affect human beings by damaging the nervous system, immune system, renal system and endocrine system when these are present above their permissible standards. To reduce the resource depletion rate and protect the sustainable development concept, recovery of heavy metals from water/wastewater becomes important.
Idea is most quality and modern instrument. Therefore, to keep our environment in safe manner, we have to share this instrument for each other. To discharge this responsibility so we provided the information on keeping our planet in safe manner using aqautic macrophytes: the opportunity of phytoremediation, the best eco-friend method. This book without any doubt gives you valuable information how much aquatic macrophytes contribute on removal of heavy metals and the methods have to be involved on evaluating the macrophytes performance for removal of heavy metals. Therefore, please do not miss, buy and get this modern instrument.
Two species of marine turtles, namely Chelonia mydas (green turtle) and Lepidochelys olivacea (olive ridley) are found nesting on the beaches of Hawkesbay and Sandspit at Karachi. Female turtles were tagged by clipping monel metal tags on both of their front flippers. A total of 3093 green and 43 olive ridley turtles were tagged during the period 1982 to 1997. Tagged turtles were recovered from local coasts as well as from abroad when they migrate from the original tagging site; 576 (18 %) green and 12 (27.9 %) olive ridley were recaptured. The number of turtles recovered per year ranged from 7 (1983) to 74 (1987). The longest recorded interval recovery was 9 years 3 months and 11 days of a tagged green turtle tagged at Sandspit and recovered from the same site. The longest recorded distance travelled by green turtle from Pakistan was approximately 1470 km up to Eriteria, Africa.