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121.
Removal of heavy metals in rinsing wastewater from plating factory by adsorption with economical viable materials 总被引:8,自引:0,他引:8
Katsumata H Kaneco S Inomata K Itoh K Funasaka K Masuyama K Suzuki T Ohta K 《Journal of environmental management》2003,69(2):187-191
The removal of heavy metals from plating factory wastewater with economical materials was investigated by the column method. Montmorillonite, kaolin, tobermorite, magnetite, silica gel and alumina were used as the economical adsorbents to wastewater containing Cd(II), Cr(VI), Cu(II) and Pb(II). This removal method of heavy metals proved highly effective as removal efficiency tended to increase with increasing pH and decrease with increasing metal concentration. The removal percentages by adsorption onto montmorillonite, tobermorite, magnetite, and silica gel showed high values for all metals. From the results for the heat of adsorption, the adsorption process in the present study might be chemisorption. The proposed method was successfully applied to the removal of Cd(II), Cr(VI) and Cu(II) in rinsing wastewater from plating factory in Nagoya City, Aichi Prefecture, Japan. Since the economical adsorbents used can be obtained commercially because they are easily synthesized, the wastewater treatment system developed is rapid, simple and cheap for the removal of heavy metals. 相似文献
122.
123.
江西九连山区常绿阔叶林林冠截留量的估算 总被引:5,自引:1,他引:5
为了研究常绿阔叶林小流域的水分平衡,我们在江西九连山区进行了3a林外雨量、林内雨量和树干流量的观测,并据此进行了年林冠截留量的估算。观测结果表明,林冠截留率由一次降雨量为0.4~1mm的78.1%逐步降低到一次降雨量为60mm的3.4%~3.6%。一次降雨量大于60mm时,林冠截留率基本稳定在这一百分数。1988、1989和1990年3a的年降水量在1718.5~2116.5mm之间。估算结果表明,年林冠截留量在300~340mm之间,约为年降水量的16%~17.5%。 相似文献
124.
The Science of Nature - 相似文献
125.
126.
Shirai Yoshihito Wakisaka Minato Yacob Shahrakbah Ali Hassan Mohd Suzuki Shin’ichi 《Mitigation and Adaptation Strategies for Global Change》2003,8(3):237-252
Palm oil industry in Malaysia is one of the potential candidates for the CDM project because large amount of methane is emitted
from the lagoons and open digesting tank of the wastewater treatment system. Therefore the first objective of the project
is to investigate the actual GHG emission from the lagoons and open digesting tank in palm oil mills in order to establish
the baseline for CDM project. Results indicated that methane contribution to biogas released from the open digesting tank
and lagoon systems were 35% and 45%, respectively. These values are much lower than the reported value of 65% obtained by
complete anaerobic condition of lab-scale experiments. Based on actual methane release measurement and information gathered
from palm oil mill about wastewater treatment, significant amount of methane emission to the atmosphere can be reduced with
the installation of new closed digesting tank system converted from the open digesting tank such as just by covering it with
applying CDM. It is estimated that a total of RM2.6 million could be obtained from the selling of electricity generated from
biogas generation and Certified Emission Reduction(CER).
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
127.
Purification and immunolocalization of a vitellin-like protein from the Pacific oyster Crassostrea gigas 总被引:4,自引:0,他引:4
A female-specific protein from the hemolymph, and a related ovarian protein were identified in the Pacific oyster Crassostrea gigas using immunological procedures. The latter protein was isolated from ovarian extract by a combination of precipitation in distilled water, ammonium sulfate fractionation, hydroxylapatite chromatography and gel filtration on a Sepharose 6B column, and was identified as a macromolecular glycolipoprotein of 500 kD; sodium dodecylsulfate polyacrylamide gel electrophoresis, under reducing conditions, revealed seven heterogeneous polypeptides. Using a specific antiserum against purified protein, we also examined the immunohistochemical distribution of the protein at light- and electron-microscopic levels. Light microscopy revealed its presence in the oocytes, and electron microscopy identified it in yolk granules and the vitelline coat of the oocytes. These results indicate that the purified protein is a vitellin-like protein. Since no organ other than the ovary reacted with the antiserum, it is probable that the protein is produced inside the ovary, probably autosynthetically by oocytes. 相似文献
128.
Effect of Chlorella pyrenoidosa on fecal excretion and liver accumulation of polychlorinated dibenzo-p-dioxin in mice 总被引:1,自引:0,他引:1
The effect of Chlorella pyrenoidosa on fecal excretion and liver accumulation of polychlorinated dibenzo-p-dioxin in C57BL/6N mice administered dioxin was examined. Mice were administered 2.2 microg of 1,2,3,4,7,8-hexachlorodibenzo-p-dioxin (H6CDD) dissolved in corn oil once after a period of acclimatization, after which they were fed either a basal diet, a 10% C. pyrenoidosa diet, or a 10% Spinach diet, for five weeks. Among mice fed the 10% C. pyrenoidosa diet, cumulative fecal excretion of H6CDD over the first week following administration was significantly greater (9.2-fold) than that observed among mice fed the basal diet. Moreover, excretion during the fifth week following administration of H6CDD was still significantly greater (3.1-fold) among mice fed the 10% C. pyrenoidosa diet than among mice fed the basal diet. Five weeks after administration of H6CDD, liver accumulation of H6CDD in mice fed the 10% C. pyrenoidosa diet was significantly less than that observed among mice fed either the basal diet and the Spinach diet (by 27.9% and 34.8%, respectively). These findings suggest that C. pyrenoidosa may be useful in inhibiting the absorption of dioxins via food and the reabsorption of dioxins stored already in the body in the intestinal tract, thus preventing accumulation of dioxins within the body. 相似文献
129.
Certain chemicals possess the potential to modulate endocrine systems, and thereby interfere with reproduction and developmental processes in the wild. We analyzed endocrine disrupters nonylphenol (NP) and bisphenol A (BPA) levels at various sites in Okinawa and Ishigaki Islands, Japan. River-water samples showed undetectable to low concentrations of NP and BPA at most of the sites investigated. However, an appreciable amount of BPA was detected in sediments at one coral reef site. In addition, significant numbers of river sediment samples showed appreciable amounts of NP and BPA. Most of the sampling sites for this study are located within a distance of 1 km from the coral reefs, which are under influence of river-waters to a variable extent. Therefore, influence of endocrine disrupters may have already begun on adjacent coral reefs. Both endocrine disrupters were positively correlated with human population densities, but not with the contents of red soil generated by farm land reformation. Therefore, it is concluded that NP and BPA pollution is a consequence of human waste discharge, both domestic and industrial, and not by agricultural activities. 相似文献
130.
In aquaculture centers of the northern region of Japan, "Nami-ita" (waved polycarbonate plates), on which the green alga Ulvella lens Crouan frat. (Chaetophoraceae: Chaetophorales) was cultured, are used to promote larval settlement and metamorphosis of the sea urchin species Strongylocentrotus intermedius (A. Agassiz) and S. nudus (A. Agassiz). We investigated chemical inducer(s) for larval settlement and metamorphosis of these sea urchins with extracts of U. lens. Bioassay-guided separation of the methanol extract using a combination of column and thin-layer chromatography led to the isolation of several active compounds, the chemical structures of which were determined by spectral and chemical methods. These active compounds were identified as glycoglycerolipids, all comprising several molecular species: sulfoquinovosyl monoacylglycerols (SQMGs), sulfoquinovosyl diacylglycerols (SQDGs), monogalactosyl monoacylglycerols (MGMGs), monogalactosyl diacylglycerols (MGDGs), digalactosyl monoacylglycerols (DGMGs) and digalactosyl diacylglycerols (DGDGs). Among these glycolipids, SQMGs, MGMGs, MGDGs and DGMGs induced larval metamorphosis of the sea urchin S. intermedius. SQMGs and MGDGs induced larval metamorphosis at a concentration of 5 µg ml-1, whereas SQDGs and DGDGs only induced larval settlement. These glycoglycerolipids are new congeners of chemical inducers to settlement and metamorphosis of planktonic larvae of sea urchins. The findings would provide a better understanding of larval settlement and metamorphosis in sea urchins. 相似文献