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排序方式: 共有64条查询结果,搜索用时 15 毫秒
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渗滤液的处理一直是生活垃圾填埋场存在的一大问题,尤其是新标准执行以来,对渗滤液的排放提出了更加严格的要求,因此处理工艺的选择成为达标排放的关键问题,本文中的“厌氧+生化+超滤+纳滤+反渗透”组合型渗滤液处理工艺能够确保污染物达标排放,并同时能满足处理后废水综合利用的要求。 相似文献
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S. Åkesson Lennart Karlsson Göran Walinder Thomas Alerstam 《Behavioral ecology and sociobiology》1996,38(5):293-302
Extensive ringing data from a coastal site (Falsterbo Bird Observatory) in southwesternmost Sweden were used to investigate
the occurrence of reverse autumn migration among 20 passerine bird species of widely different migration categories. The data
demonstrate that reverse migration is a widespread and regular phenomenon among nocturnal as well as diurnal migrants and
among irruptive migrants, temperate zone migrants, and long-distance migrants destined for tropical winter quarters. The reoriented
movements were directed approximately opposite to the normal migration direction, i.e. between NNW and ENE from the coast
and towards inland. Median distances of reverse movements varied between 9 and 65 km. Some individuals of irruptive and partial
migrants settled to winter in the reverse direction. Bird species with relatively small fat reserves at capture were more
likely to perform reverse migratory movements than species with larger fat deposits. In two species birds performing forward
migration were significantly heavier within 10 days after capture than individuals performing reverse movements. The reoriented
movements probably are of adaptive significance for birds confronted with the sea and pre-disposed to refuelling during migration.
A bimodal orientation mechanism will bring the birds from an area with high competition for food and high predation risk to
more suitable resting and feeding grounds before resuming migration in the forward direction and crossing the barrier.
Received: 11 July 1995/Accepted after revision: 19 November 1995 相似文献
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反渗透膜在分散型农村饮用水深度处理中开发应用研究 总被引:2,自引:2,他引:0
以反渗透膜为主,综合集成超滤、微滤、砂滤、活性碳吸附、紫外线消毒等技术措施.设计安装了适合农村自来水、井水、河水不同饮用水源深度净化处理的3套设备。运行结果表明,设备对于饮用水源中的有机物、微生物、色味臭,以及自来水中的余氯,处理效果非常明显。研究成果为解决分散型农村安全饮用水问题.提供了比较好的技术方案。 相似文献
46.
根据锦西石化污水的性质,讨论了利用膜生物反应器与反渗透技术相结合,处理石油化工行业污水的技术路线。结果表明采用此工艺,对于可生化性差、污染物成分相对复杂的石化行业污水,经过处理后,水质稳定,品质高。 相似文献
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Xiyan Xu Shuming Liu Ying Liu Kate Smith Xiaoting Wang Junyu Li Ziqing M Zhangqing Wang Yong Cui 《环境科学学报(英文版)》2020,32(3):218-226
The current study analyzes the contribution of 10 water quality parameters (including pH, turbidity, conductivity, total dissolved solids (TDS), hardness, total organic carbon (TOC), alkalinity, calcium ions, chlorides and sulfates) to corrosion extent of stainless steel valves taken from different locations in a reverse osmosis system of a reclaimed water plant. The valves were in service for 5 years. Raman spectroscopy and X-ray photoelectron spectroscopy analyses are conducted to quantify corrosion products on different valves under various water quality conditions. On that basis, bivariate and multivariate regression analyses between the 10 water quality parameters and the corrosion extent of valve specimens (represented by metal loss percentage (MLP) values) are carried out to check the contribution of those water quality parameters to MLP. The results indicate that the proportions of metal oxides as corrosion products vary according to the corrosion extent of the valves. Although no linear correlation is found, all 10 water quality parameters except for pH show a significant positive correlation with the MLP values of the valve specimens. Moreover, results of multivariate regression suggest that the variation of MLP can be explained by turbidity, TDS, TOC and sulfates. A positive contribution of turbidity, TDS and TOC to MLP is observed, whereas the contribution of sulfates is negative. The results from the current work help to identify the reasons for water quality-induced failure of stainless steel equipment in RO systems. 相似文献
49.
Burst disks are often used as the highest level of defense against over pressure. 36 knife blade burst disks were spent to test their steadfastness and reliability. Half of the burst disks were subjected to stress similar to normal use in a plant. They showed no sign of degradation compared to the unstressed disks. However many disks failed to burst at the specified pressure and none opened with the specified cross section. These parameters are essential for dimensioning pressure relief equipment. 相似文献
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