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排序方式: 共有122条查询结果,搜索用时 46 毫秒
21.
本文就内蒙古环保局几年来开展环保科研工作情况进行了总结、回顾 ,并提出今后开展此项工作新思路、新方法、新要求 相似文献
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Jung JM Lee YJ Park HG Jung EY Jang MH Ha K Shin PS Joo GJ 《Journal of environmental biology / Academy of Environmental Biology, India》2005,26(1):97-103
Cyanobacterial blooms and associated microcystins in hypertrophic stagnant West-Nakdong River were investigated at weekly intervals from April to August, 1999. Microcystis spp. accounted for over 85% of the numeric abundance of total phytoplankton. Microcystins were present in the blooms sampled between May and August. The peak of total microcystin (microcystin-LR + -RR) levels (maximum level; 612 microg g(-1)) was detected in the initial stage of the bloom (mid May), at the same time as high N/P ratio and high Microcystis biomass. This study indicated that total microcystins of this regulated river was positively correlated to Microcystis biomass, absolute nutrient concentration and TN/TP ratio. 相似文献
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本文对1996-2000年全区城市环境综合整治定量考核工作进行了全面的分析,介绍了目前“城考”工作的状况,总结了经验,对今后的“城考”工作提出了建议。 相似文献
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We have developed a new nanofilter using a carbon nanotube-silver composite material that is capable of efficiently removing waterborne viruses and bacteria.The nanofilter was subjected to plasma surface treatment to enhance its flow rate,which was improved by approximately 62%.Nanoscale pores were obtained by fabricating a carbon nanotube network and using nanoparticle fixation technology for the removal of viruses.The pore size of the nanofilter was approximately 38 nm and the measured flow rate ranged from 21.0 to 97.2 L/(min·m~2)under a pressure of 1–6 kgf/cm~2 when the amount of loaded carbon nanotube-silver composite was 1.0 mg/cm~2.The nanofilter was tested against Polio-,Noro-,and Coxsackie viruses using a sensitive real-time polymerase chain reaction assay to detect the presence of viral particles within the outflow.No trace of viruses was found to flow through the nanofilter with carbon nanotube-silver composite loaded above 0.8 mg/cm~2.Moreover,the surface of the filter has antibacterial properties to prevent bacterial clogging due to the presence of 20-nm silver nanoparticles,which were synthesized on the carbon nanotube surface. 相似文献
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Misoo Shin Dongsoon Jang Jongwook Ha 《Journal of Material Cycles and Waste Management》2016,18(3):399-406
Considering the global warming potential of R-134a (C2H2F4) with the substantial generation of this refrigerant as waste material in various industrial sectors, the development of proper thermal destruction method of R-134a is of great practical significance. For this, experiment and numerical calculations have initially made for a tubular-type furnace in order to figure out the basic combustion characteristics of R-134a. A series of experimental investigations for the thermal decomposition of R-134a have been made as a function of wall temperature of tubular furnace and important reacting species such as O2 and H2O necessary for the decomposition of C2H2F4 into HF, CO2 and H2O. In general, the thermal decomposition of R-134a is successfully made for the condition of temperature above 800 °C with the supply of stoichiometric amount of O2 and these results are well agreed with numerical prediction. And this information is employed for the simulation of a full-scale, practical incinerator used for the CDM project. For this, numerical investigation has been made for a commercial-scale incinerator using CH4–air flames for the proper destruction C2H2F4 together with the control of pollutants such as CO and NO. In general, the destruction rate of C2H2F4 appears more than 99.99 % and the generation of CO and NO species appears rather sensitive to the operational condition such as amount of water vapor. The numerical method of HFCs (hydrofluorocarbons) thermal treatment shows high possibility as a viable tool for the proper design and optimal determination of the operational condition for a HFCs incinerator. 相似文献
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Nguyen Hao-Quang Ha Nam-Thang Pham Thanh-Luu 《Environmental science and pollution research international》2020,27(9):9135-9151
Environmental Science and Pollution Research - In recent years, Tri An, a drinking water reservoir for millions of people in southern Vietnam, has been affected by harmful cyanobacterial blooms... 相似文献
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Spatio-temporal variations of biochemical oxygen demand (BOD) and total coliform (TC) in the Han River, Korea, were investigated
in terms of concentration-based and mass loading-based approaches. Considering the river water quality criteria regulated
by the Ministry of Environment in Korea, the tributaries linked to the mainstream of the Han River were found to be highly
contaminated with respect to both BOD and TC and, in fact, most of the tributaries exceeded the maximum water quality criteria.
To evaluate the pollution impact of tributaries on the mainstream, the monthly water quality monitoring data for six years
(from 1995 to 2000) were collected from the Han River basin, and statistically analyzed using Pearson’s correlation coefficient.
The results revealed that mass loading-based approach was superior to the concentration-based approach for effective Han River
watershed management. Overall results supported that the mass loading-based approach associated with total maximum daily loads
(TMDL) management would be a useful and suitable protocol in watershed management for improving the water quality of the Han
River and protecting public health. Therefore, this study supporting TMDL management can be applicable to a wide array of
contaminants and watershed settings in Korea. 相似文献