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91.
Chi Jung Oh Sung Oh Lee Hyung Sik Yang Tae Jun Ha 《Journal of the Air & Waste Management Association (1995)》2013,63(7):897-902
Abstract This study was carried out to recover valuable metals from the printed circuit boards (PCBs) of waste computers. PCB samples were crushed to smaller than 1 mm by a shredder and initially separated into 30% conducting and 70% nonconducting materials by an electrostatic separator. The conducting materials, which contained the valuable metals, were then used as the feed material for magnetic separation, where it was found that 42% of the conducting materials were magnetic and 58% were nonmagnetic. Leaching of the nonmagnetic component using 2 M H2SO4 and 0.2 M H2O2 at 85 °C for 12 hr resulted in greater than 95% extraction of Cu, Fe, Zn, Ni, and Al. Au and Ag were extracted at 40 °C with a leaching solution of 0.2 M (NH4)2S2O3, 0.02 M CuSO4, and 0.4 M NH4OH, which resulted in recovery of more than 95% of the Au within 48 hr and 100% of the Ag within 24 hr. The residues were next reacted with a 2 M NaCl solution to leach out Pb, which took place within 2 hr at room temperature. 相似文献
92.
We characterized fluorescent silica nanoparticles (FNPs), which had been applied in many biological systems, in fish embryo rearing media (ERM) solution and evaluated the potential toxicity to the early development of Oryzias latipes embryos. Distribution of FNPs in embryos and larvae of O. latipes was studied by fluorescent and confocal laser scanning microscopic studies. Embryos exposed to three different concentrations of FNPs in stirred or sonicated ERM solutions were observed up to 2 d after hatching. FNPs had a negligible effect on the hatchability of O. latipes embryos; however, compared to controls, more than 30% of eggs were abnormal in 10 and 50 mg FNP L−1 solutions. We found that the toxic effect was increased in sonicated FNP solution, which seems to be related with the dissolution of FNPs in ERM solutions that could be accelerated by sonication. Further study found that the CaCl2 included in ERM solution might enhance the dissolution of the FNPs and the silicate ion released from FNPs partially contributed to larval toxicity. This study showed that some nanoparticles may not be stable in biological fluids even if they are stable in water. Dissolution factors such as sonication and cellular components should be considered in biological application of nanoparticles. 相似文献
93.
Thapa Shanti Ha Tae Young Lee Heonsuk Adelodun Adedeji A. Min Jo Young 《Journal of Material Cycles and Waste Management》2018,20(1):293-301
Journal of Material Cycles and Waste Management - Direct disposal of flue gas scrubbing-derived waste water with a high level (9000–10,000 mg/L) of ammonium ion (NH4 +) into aquatic... 相似文献
94.
95.
Factors dominating stratification cycle and seasonal water quality variation in a Korean estuarine reservoir 总被引:4,自引:0,他引:4
Lee YG Kang JH Ki SJ Cha SM Cho KH Lee YS Park Y Lee SW Kim JH 《Journal of environmental monitoring : JEM》2010,12(5):1072-1081
A comprehensive monitoring program was conducted during 2005-2007 to investigate seasonal variations of hydrologic stability and water quality in the Yeongsan Reservoir (YSR), located at the downstream end of the Yeongsan River, Korea. A principal component analysis (PCA) was performed to identify factors dominating the seasonal water quality variation from a large suite of measured data--11 physico-chemical parameters from 48 sampling sites. The results showed that three principal components explained approximately 62% of spatio-seasonal water quality variation, which are related to stratifications, pollutant loadings and resultant eutrophication, and the advective mixing process during the episodic rainfall-runoff events. A comparison was then made between YSR and an upstream freshwater reservoir (Damyang Reservoir, DYR) in the same river basin during an autumn season. It was found that the saline stratification and pollutant input from the upstream contributed to greater concentrations of nutrients and organic matter in YSR compared to DYR. In YSR, saline stratification in combination with thermal stratification was a dominant cause of the longer period (for two consecutive seasons) of hypoxic conditions at the reservoir bottom. The results presented here will help better understand the season- and geography-dependent characteristics of reservoir water quality in Asian Monsoon climate regions such as Korea. 相似文献
96.
Thang Nguyen Quoc Huy Bui The Khanh Dang Nguyen Nha Vy Ngo Thi Tuong Phuong Tran Ha Sy Do Trung Tham Le Thi Phuong Nguyen Thi Kim 《Environmental science and pollution research international》2021,28(39):54960-54971
Environmental Science and Pollution Research - This study aimed to evaluate the health risks of cadmium (Cd), lead (Pb), inorganic arsenic (As), and nitrate exposure through the consumption of... 相似文献
97.
98.
Debbabi Haïfa El Mokni Ridha Nardoni Simona Chaieb Ikbal Maggi Filippo Nzekoue Franks Kamgang Caprioli Giovanni Hammami Saoussen 《Environmental science and pollution research international》2021,28(11):13624-13633
Environmental Science and Pollution Research - This study is focused on the analysis of regional variation of the chemical compositions of three Clinopodium menthifolium subsp. ascendens (Jord.)... 相似文献
99.
Do Thi Nhu Ngoc Ngo Xuan Truong Pham Van Ha Vuong Nhu Luan Le Hoang Anh Pham Chau Thuy Bui Quang Hung Nguyen Thi Nhat Thanh 《Environmental science and pollution research international》2021,28(10):12067-12081
Environmental Science and Pollution Research - The WRF-Chem (Weather Research and Forecasting with Chemistry) model is implemented and validated against ground-based observations for meteorological... 相似文献
100.
Santiago Badillo Tania Patricia Pham Thi Thanh Ha Nadeau Mireille Allard-Massicotte Rosalie Jacob-Vaillancourt Colin Heitz Michèle Avalos Ramirez Antonio 《Environmental science and pollution research international》2021,28(23):29037-29045
Environmental Science and Pollution Research - Composting process of residual organic material generates considerable amounts of liquid leachate which contains high organic load. This waste stream... 相似文献