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排序方式: 共有63条查询结果,搜索用时 35 毫秒
1.
Iron oxide-loaded slag for arsenic removal from aqueous system 总被引:5,自引:0,他引:5
An effective adsorbent for arsenic removal from aqueous system was synthesized by loading iron(III) oxide on municipal solid waste incinerator melted slag. The loading was accomplished via chemical processes and thermal coating technique. The key point of the technique was the simultaneous generation of amorphous FeOOH sol and silica sol in-situ and eventually led to the formation of Fe-Si surface complexes which combined the iron oxide with the melted slag tightly. The surface morphology of the iron oxide-loaded slag was examined and the loading mechanisms were discussed in detail. The adsorbent was effective for both arsenate and arsenite removal and its removal capabilities for As(V) and As(III) were 2.5 and 3 times of those of FeOOH, respectively. Both affinity adsorption and chemical reactions contributed to arsenic removal. The effects of solution pH, contact time, arsenic concentration and adsorbent dosage on arsenic removal were examined and the optimum removal conditions were established. Furthermore, leaching of hazardous elements such as Cr(VI), As, Se, Cd and Pb from the adsorbent at a pH range of 2.5-12.5 was below the regulation values. Accordingly, it is believed that the iron oxide-loaded slag developed in this study is environmentally acceptable and industrially applicable for wastewater treatment. 相似文献
2.
Nina Y. Ileva Hideaki Shibata Fuyuki Satoh Kaichiro Sasa Hiroshi Ueda 《Sustainability Science》2009,4(2):189-198
The present research investigated the relationship between nitrate–nitrogen (NO3–N) in river water and the land use/land cover (hereafter, land use) in the Teshio River watershed located in northern Hokkaido
island to understand the effect of human activities such as agriculture, forestry, industry, and urbanization in the drainage
basin on the river ecosystem quality and services. River water was sampled at nine points seasonally during a 2-year period
and the nutrients concentration was measured. Land use profiles were estimated at two spatial scales, riparian and sub-catchment,
for each sampling station. The spatial pattern of water quality in the Teshio River showed increased NO3–N levels associated with agriculture and urban expansion, and forest reduction in the watershed. Land use at the riparian
scale closely reflected that at the sub-catchment scale, which masked the unique riparian buffer effect on the river water
condition. The increased agricultural and reduced forest area in the riparian zone, especially in the upper middle reach,
could be a possible reason for a decline of ecosystem service for the provisioning of clean water and habitat for aquatic
organisms. Measures towards sustainable and more nature-friendly agricultural management are necessary in the area to protect
the Teshio River ecosystem and its ecosystem services. 相似文献
3.
Mato Y Suzuki N Katatani N Kadokami K Nakano T Nakayama S Sekii H Komoto S Miyake S Morita M 《Chemosphere》2007,67(9):S247-S255
PCDDs, PCDFs, and dioxin like PCBs (dioxin) surveillance results derived from regular environmental monitoring as well as other dioxin surveys by national and local governmental bodies in Japan were collected and analyzed. Several thousand data for air and soil in fiscal year 2001 (from 01/04/2001 to 31/03/2002) and 2002, water (from the sea, rivers and lakes), sediment (from the sea, rivers and lakes), ground water, aquatic organisms, purified water from water purification plants, raw water from water purification plants, human breast milk, and human blood in fiscal 2001, and total diet study (TDS) and various kinds of foodstuff in fiscal 1998-2002 were collected. Average human uptake of dioxin in Japan in fiscal 2001 was estimated at 1.68 pg-TEQ/kg-bw/day, while uptake in fiscal 2002 was estimated at 1.52 pg-TEQ/kg-bw/day. Diet accounted for more than 90% of the total intake. Contributions of inhalation and soil ingestion were relatively small. Age-group-specific contribution of various foodstuff to total dietary intake was also estimated. The estimates of intake through fish and shellfish accounted for approximately 45-70% of total dietary intake in each age group. Monte Carlo simulation was conducted, using the data of the air and soil concentrations in fiscal 2001 and the total diet study data in fiscal 1998-2001, in order to obtain information on the variability of dioxin intake; The estimated average, median, 5th percentile and 95th percentile of the intake distribution were 1.78, 1.69, 0.95 and 2.91 pg-TEQ/kg-bw/day, respectively. This study found that the average total intake estimates in Japan in both fiscal 2001 and 2002 were estimated to be below tolerable daily intake level (TDI) defined by the Ministry of Health, Labour and Welfare, Japan (i.e. 4 pg-TEQ/kg-bw/day). The 95th percentile of the dioxin intake distributions estimated with Monte Carlo simulation using the data of the air and soil concentrations in fiscal 2001 and TDS data in fiscal 1998-2001 was also below the Japanese TDI. 相似文献
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5.
Review of ozone and temperature lidar validations performed within the framework of the Network for the Detection of Stratospheric Change 总被引:1,自引:0,他引:1
Keckhut P McDermid S Swart D McGee T Godin-Beekmann S Adriani A Barnes J Baray JL Bencherif H Claude H di Sarra AG Fiocco G Hansen G Hauchecorne A Leblanc T Lee CH Pal S Megie G Nakane H Neuber R Steinbrecht W Thayer J 《Journal of environmental monitoring : JEM》2004,6(9):721-733
The use of assimilation tools for satellite validation requires true estimates of the accuracy of the reference data. Since its inception, the Network for Detection of Stratospheric Change (NDSC) has provided systematic lidar measurements of ozone and temperature at several places around the world that are well adapted for satellite validations. Regular exercises have been organised to ensure the data quality at each individual site. These exercises can be separated into three categories: large scale intercomparisons using multiple instruments, including a mobile lidar; using satellite observations as a geographic transfer standards to compare measurements at different sites; and comparative investigations of the analysis software. NDSC is a research network, so each system has its own history, design, and analysis, and has participated differently in validation campaigns. There are still some technological differences that may explain different accuracies. However, the comparison campaigns performed over the last decade have always proved to be very helpful in improving the measurements. To date, more efforts have been devoted to characterising ozone measurements than to temperature observations. The synthesis of the published works shows that the network can potentially be considered as homogeneous within +/-2% between 20-35 km for ozone and +/-1 K between 35-60 km for temperature. Outside this altitude range, larger biases are reported and more efforts are required. In the lower stratosphere, Raman channels seem to improve comparisons but such capabilities were not systematically compared. At the top of the profiles, more investigations on analysis methodologies are still probably needed. SAGE II and GOMOS appear to be excellent tools for future ozone lidar validations but need to be better coordinated and take more advantage of assimilation tools. Also, temperature validations face major difficulties caused by atmospheric tides and therefore require intercomparisons with the mobile systems, at all sites. 相似文献
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9.
Miyabara Y Miyata K Suzuki J Suzuki S 《Environmental pollution (Barking, Essex : 1987)》1994,84(2):111-115
In this study, we attempted to establish a new indicator for fecal pollution of river sediment using a sensitive detection method for urobilin. Urobilin contained in sediment was extracted with an alkaline buffer solution. The suitable buffer solution for extraction of urobilin consisted of 0.1 M Tris-HCl buffer (pH 10.0) containing 0.1 m sodium chloride. The ratio of sediment to buffer was 1:10. The distribution of urobilin in river sediment was studied by this method. The amount of urobilin in the river sediment of Tokyo (urban) and the Miura peninsula (rural) area was surveyed. Large quantities of urobilin were detected in the sediments of the urban rivers, but it was scarce in the rural rivers. Urobilin showed a higher content in sediment than in water. Urobilin in river sediment is distributed in large amounts in the lower reaches, where the water is polluted with domestic sewage and industrial waste, but is scarce in the upper streams. The amount of urobilin decreases to the lower layers. 相似文献
10.
Although snappers (Lutjanidae) are commercially important fishery resources in tropical and subtropical waters, their home
range size and its spatial arrangement have not been sufficiently clarified. In the present study, the size and spatial arrangement
of the home range of the reef-associated checkered snapper Lutjanus decussatus (Lutjanidae) were investigated by use of a portable GPS receiver. In a 120 m × 120 m quadrat established on a section of
the fringing reef of Ishigaki Island, 29 individuals of the species were identified by their color pattern and individuals
were divided into five arbitrary size classes (class 1 <10 cm TL ≤ class 2 <15 cm TL ≤ class 3 <20 cm TL ≤ class 4 <25 cm
TL ≤ class 5). Fish tracking by snorkeling was conducted with the portable GPS receiver. Site fidelity of this species was
high. Home range size ranged from 93.0 to 3638.4 m2, and there was a significant positive correlation between the home range size and fish total length. Home ranges of the same-sized
individuals abutted each other (8.8% area overlap), whereas those of different-sized individuals overlapped (44.0% area overlap).
Agonistic behavior (attack and agonistic display) was more frequently found among same-sized individuals (times of agonistic
behavior/times of all encounters × 100 = 71.3%), whereas such agonistic behavior was rarely found among different-sized individuals
(times of agonistic behavior/times of all encounters × 100 = 6.9%). These results suggest that home ranges of Lutjanus decussatus can be regarded as territories against same-sized individuals, but not different-sized individuals. The usefulness of the
fish tracking by snorkeling using a portable GPS receiver for home range size estimation and the function of the overlapping
territory of the species are discussed. 相似文献