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101.
Mishra Jyotirmoy Nanda Bharadwaj Patro Sanjaya K. Das Shaswat K. Mustakim Syed M. 《Journal of Material Cycles and Waste Management》2022,24(3):1095-1108
Journal of Material Cycles and Waste Management - Earlier studies indicated that the reactive MgO reduces shrinkage crack and porosity, and accelerates the hydration and strength development.... 相似文献
102.
Treatment of electronic waste to recover metal values using thermal plasma coupled with acid leaching--a response surface modeling approach 总被引:1,自引:0,他引:1
Rath SS Nayak P Mukherjee PS Roy Chaudhury G Mishra BK 《Waste management (New York, N.Y.)》2012,32(3):575-583
The global crisis of the hazardous electronic waste (E-waste) is on the rise due to increasing usage and disposal of electronic devices. A process was developed to treat E-waste in an environmentally benign process. The process consisted of thermal plasma treatment followed by recovery of metal values through mineral acid leaching. In the thermal process, the E-waste was melted to recover the metal values as a metallic mixture. The metallic mixture was subjected to acid leaching in presence of depolarizer. The leached liquor mainly contained copper as the other elements like Al and Fe were mostly in alloy form as per the XRD and phase diagram studies. Response surface model was used to optimize the conditions for leaching. More than 90% leaching efficiency at room temperature was observed for Cu, Ni and Co with HCl as the solvent, whereas Fe and Al showed less than 40% efficiency. 相似文献
103.
The aim of this study was to assess the toxicity reduction of wastewaster after treatment with fly ash. Fly ash is a waste material which is formed as a result of coal burning in power plants, but has the potential to adsorb heavy metal ions. The present study examined the adsorption capacity of fly ash to adsorb Pb2+, Cu2+, and Zn2+ from waste water under different conditions of contact time, pH, and temperature. Uptake of metal ions by fly ash generally rose with increasing pH. At lower temperatures the uptake of heavy metal adsorption were enhanced. Significant reduction in Pb2+ (79%), Cu2+ (53%), and Zn2+ (80%) content was found after treatment with fly ash of waste water treatment. Using the microtox test toxicity of the effluent was reduced by 75% due to removal of Pb2+ ion by the fly ash. Data indicated that fly ash generated by power plants may be used beneficially to remove metals from waste water. 相似文献
104.
A comparison between activated charcoal and heat-treated coal for decolourization of pulp and paper mill waste water was studied.
The heat-treated coal was prepared in an inert atmosphere at 800°C. The adsorption dynamics that include batch contact–time
study, kinetics along with adsorption isotherms were carried out. The study shows that heat-treated coal is a suitable adsorbent
and can be used for the decolourization of pulp and paper mill effluent streams. The maximum removal was achieved at the initial
stages of contact, and the overall adsorption was a slow process. However, the equilibrium concentration in the case of both
the adsorbents reaches at almost same time. The linear plot of the Lagergren model shows its applicability and first-order
kinetics. 相似文献
105.
A simple sol–gel method was employed to prepare gadolinium, nitrogen and sulphur tridoped titania decorated on oxidised multiwalled carbon nanotubes (MWCNT/Gd,N,S-TiO2), using titanium (IV) butoxide and thiourea as titanium and nitrogen and sulphur source, respectively. Samples of varying gadolinium loadings (0.2%, 0.6%, 1.0% and 3.0% Gd3 +) relative to titania were prepared to investigate the effect of gadolinium loading and the amounts of carbon nanotubes, nitrogen and sulphur were kept constant for all the samples. Furthermore, the prepared nanocomposites were evaluated for the degradation of naphthol blue black (NBB) in water under simulated solar light irradiation. Higher degradation efficiency (95.7%) was recorded for the MWCNT/Gd,N,S-TiO2 (0.6% Gd) nanocomposites. The higher photocatalytic activity is attributed to the combined effect of improved visible light absorption and charge separation due to the synergistic effect of Gd, MWCNTs, N, S and TiO2. Total organic carbon (TOC) analysis revealed a higher degree of complete mineralisation of naphthol blue black (78.0% TOC removal) which minimises the possible formation of toxic degradation by-products such as the aromatic amines. The MWCNT/Gd,N,S-TiO2 (0.6% Gd) was fairly stable and could be re-used for five times, reaching a maximum degradation efficiency of 91.8% after the five cycles. 相似文献
106.
Since a considerable amount of fluoride (Fl) intake also takes place through the ingestion of foods that are grown in the contaminated soil and irrigated with elemental contaminated water, this may lead to higher risk from Fl-mediated toxicity. Therefore, in the present study, a systematic delineation and characterization of Fl in agricultural tube wells in Unnao District, India, were carried out to examine seasonal variations of this element using graphical and multivariate statistical approach. The results suggested that different natural hydro-geochemical processes such as weathering of silicates, carbonates, and various ion exchange processes are the key factors responsible for the geochemistry of the groundwater in addition to the alkalinity of water. Of the water sampled, 27.3% and 18.2% were contaminated with Fl exceeding the desirable limit of 1 mg/L as prescribed by Bureau of Indian Standards during pre-monsoon and post-monsoon season. Fluoride displayed a significant positive correlation during both seasons and the water type of the majority of the samples in both seasons was bicarbonate. 相似文献
107.
K. Dhineka M. Sambandam S. K. Sivadas T. Kaviarasan Umakanta Pradhan Mehmuna Begum Pravakar Mishra M. V. Ramana Murthy 《Frontiers of Environmental Science & Engineering》2022,16(1):10
108.
Vikas Pandey Zeba Usmani Avantika Chandra Rohit Kumar Mishra 《Chemistry and Ecology》2017,33(8):777-794
Ten sampling points were selected in Kanhan River, situated near the ash dump sites of Koradi Thermal Power Plant, Nagpur. The leaching of trace elements from fly ash dumps was experimentally determined by acid digestion, batch leaching and toxicity characteristic leaching procedure tests. Elemental concentrations in river water, sediment, plankton and five commonly prevailing fish species (Catla catla, Labeo bata, Cyprinus carpio, Cirrhinus reba, Puntius ticto) were determined using a Flame Atomic Absorption Spectrophotometer during the pre-monsoon and post-monsoon seasons. Metal concentrations (Cr, Mn, Zn, Cu, Fe, Ni, Cu and Pb) in river water were higher during the pre-monsoon season compared to the post-monsoon season. Zn (30.65?mg/kg) was observed to be the most predominant metal in plankton during the pre-monsoon season while, during the post-monsoon season, Fe (21.19?mg/kg) showed the maximum concentration. Muscles of C. catla had metal concentrations (Cr, Mn, Zn, Fe, Cu and Pb) above the permissible limits of Food and Agricultural Organization (FAO 1983) during the pre-monsoon season. Bioaccumulation factor (BAF) was found highest for Cr (37.5) in muscles of C. catla during the pre-monsoon season, while BAF was observed to be maximum in L. bata for Cu (28.09), which may be detrimental for human consumption. 相似文献
109.
Lata Kumari Dhanesh Tiwary Pradeep Kumar Mishra 《Environmental science and pollution research international》2016,23(5):4054-4062
A significant proportion of xenobiotic recalcitrant azo dyes are being released in environment during carpet dyeing. The bacterial strain Stenotrophomonas sp. BHUSSp X2 was isolated from dye contaminated soil of carpet industry, Bhadohi, India. The isolated bacterial strain was identified morphologically, biochemically, and on the basis of 16S rRNA gene sequence. The isolate decolorized 97 % of C.I. Acid Red 1 (Acid RED G) at the concentration of 200 mg/l within 6 h under optimum static conditions (temperature ?35 °C, pH 8, and initial cell concentration 7?×?107 cell/ml). Drastic reduction in dye degradation rate was observed beyond initial dye concentration from 500 mg/l (90 %), and it reaches to 25 % at 1000 mg/l under same set of conditions. The analysis related to decolorization and degradation was done using UV-Vis spectrophotometer, HPLC, and FTIR, whereas the GC-MS technique was utilized for the identification of degradation products. Phytotoxicity analysis revealed that degradation products are less toxic as compared to the original dye. 相似文献
110.
S.W. Bunting S. Luo K. Cai N. Kundu S. Lund R. Mishra 《Journal of Environmental Planning and Management》2016,59(9):1580-1609
The need for enhanced environmental planning and management for highland aquatic resources is described and a rationale for integrated action planning is presented. Past action planning initiatives for biodiversity conservation and wetland management are reviewed. A reflective account is given of integrated action planning from five sites in China, India and Vietnam. Eight planning phases are described encompassing: stakeholder assessment and partner selection; rapport building and agreement on collaboration; integrated biodiversity, ecosystem services, livelihoods and policy assessment; problem analysis and target setting; strategic planning; planning and organisation of activities; coordinated implementation and monitoring; evaluation and revised target setting. The scope and targeting of actions are evaluated using the Driving forces, Pressures, State, Impacts and Responses framework and compatibility with biodiversity conservation and socio-economic development objectives are assessed. Criteria to evaluate the quality of planning processes are proposed. Principles for integrated action planning elaborated here should enable stakeholders to formulate plans to reconcile biodiversity conservation with the wise use of wetlands. 相似文献