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91.
Swayamprabha Mishra Monalisa Mohanty Chinmay Pradhan Hemanta Kumar Patra Ritarani Das Santilata Sahoo 《Environmental monitoring and assessment》2013,185(5):4347-4359
The present investigation aims to assess the phytoremediation potential of six aquatic macrophytes, viz. Eichhornia crassipes, Hydrilla verticillata, Jussiaea repens, Lemna minor, Pistia stratiotes and Trapa natans grown in paper mill effluent of JK Paper mill of Rayagada, Orissa, for remediation of heavy metals. The experiment was designed in pot culture experiments. Assessment of physico-chemical parameters of paper mill effluent showed significant decrease in pH, conductivity, total dissolved solids, total suspended solids, chlorine, sulphur, biological and chemical oxygen demand after growth of macrophytes for 20 days. Phytoremediation ability of these aquatic macrophytic species for copper (Cu) and mercury (Hg) was indicated by assessing the decrease in the levels of heavy metals from effluent water. Maximum reduction (66.5 %) in Hg content of untreated paper mill effluent was observed using L. minor followed by T. natans (64.8 %). L. minor showed highest reduction (71.4 %) of Cu content from effluent water followed by E. crassipes (63.6 %). Phytoextraction potential of L. minor was remarkable for Hg and Cu, and bioaccumulation was evident from bioconcentration factor values, i.e. 0.59 and 0.70, respectively. The present phytoremediation approach was considered more effective than conventional chemical treatment method for removing toxic contaminants from paper mill effluent. 相似文献
92.
Dey RK Swain SK Mishra S Sharma P Patnaik T Singh VK Dehury BN Jha U Patel RK 《Environmental monitoring and assessment》2012,184(5):3279-3291
The present investigation reports the assessment of hydrochemical/geochemical processes controlling the concentration of fluoride
in groundwater of a village in India (Boden block, Orissa). Boden block is one of the severely affected fluoride-contaminated
areas in the state of Orissa (India). The sampling and subsequent analysis of water samples of the study area was carried
out following standard prescribed methods. The results of the analysis indicate that 36.60% groundwater F− concentration exceeds the limit prescribed by the World Health Organization for drinking water. The rock interaction with
groundwater containing high concentration of HCO3− and Na+ at a higher pH value of the medium could be one of the important reasons for the release of F− from the aquatic matrix into groundwater. Geochemical classification of groundwater based on Chadha rectangular diagram shows
that most of the groundwater samples having fluoride concentration more than 1.5 mg L−1 belongs to the Na-K-HCO3 type. The saturation index values evaluated for the groundwater of the study area indicated that it is oversaturated with
respect to calcite, whereas the same is undersaturated with respect to fluorite content. The deficiency of calcium ion concentration
in the groundwater from calcite precipitation favors fluorite dissolution leading to excess of fluoride concentration. The
risk index was calculated as a function of fluoride level in drinking water and morbidity of fluorosis categorizes high risk
for villages of Amera and Karlakote panchayat of Boden block. 相似文献
93.
Mohanty M Pattnaik MM Mishra AK Patra HK 《Environmental monitoring and assessment》2012,184(2):1015-1024
Mine waste water at South Kaliapani usually contains toxic levels of hexavalent Cr(VI). The present in situ study was conducted at South Kaliapani chromite mine area in Orissa state, India, to assess the phytoremediation ability
of three plants, namely, rice (Oryza sativa L.), paragrass (Brachiaria mutica), and an aquatic weed (Eichhornia crassipes), in attenuating Cr(VI) from mine waste water and to correlate the bio-concentration factors (BCF) of Cr. Water hyacinth
(E. crassipes) showed 24% to 54% reduction whereas paragrass (B. mutica) was able to reduce 18% to 33% of Cr(VI) from mine water. This reduction was studied over a period of 100 days of plant growth.
The reduction was observed through a passage of a sum total of 2,000 sq. ft. cultivated plots and ponds separately. Reduction
in Cr(VI) content in mine water varies with plant age as well as with the distance of passage. Cr accumulation and BCF values
increased with high soil Cr levels as well as the age of plants. High BCF and transportation index (Ti) values, i.e., 10,924
and 32.09, respectively, were noted for water hyacinth. The Ti values indicated that the root-to-shoot translocation of Cr
was very high after 100 days of growth. The total accumulation rate was maximum (8.29 mg Cr kg dry biomass − 1 day − 1) in paragrass. The BCF values for roots were noted to be higher than those of leaves, stems, and grains of the 125-day-old
plants. Hence, paragrass and water hyacinth may be used as tools of phytoremediation to combat the problem of in situ Cr contamination. 相似文献
94.
95.
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
96.
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
97.
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
98.
99.
100.
A. Siva Reddy G. C. Mishra K. Seetharamiah 《Journal of the American Water Resources Association》1972,8(1):55-62
Using Schwarz-Christoffel transformation, an analysis is presented for finding the pressure distribution and exit gradients for a weir on an anisotropic drained stratum. 相似文献