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排序方式: 共有62条查询结果,搜索用时 19 毫秒
1.
膜法水处理技术及研究进展 总被引:3,自引:0,他引:3
综述了反渗透、微滤、超滤、纳滤、渗透蒸发、液膜等几种常见膜技术的应用现状及进展情况 ,主要对反渗透膜的原理、流程、存在的问题及开发和利用情况进行了介绍。简单概括了近年发展起来的双极膜等新膜分离技术的开发研究。展望了膜分离技术的前景 相似文献
2.
膜分离技术处理电镀废水的实验研究 总被引:1,自引:0,他引:1
采用纳滤+反渗透2级处理系统浓缩回收电镀铜漂洗废水。实验结果显示:在△P=1.5MPa条件下进行浓缩.纳滤膜可以使料液浓缩近10倍。纳滤膜对Cu^2+的截留率在96%以上,对COD的截留率在57%以上。在△P=3.0MPa条件下进行浓缩,反渗透膜可以使料液浓缩近10倍。反渗透膜对Cu^2+的截留率在98%以上,对COD的截留率在67%以上。随着料液浓度的增加,纳滤膜和反渗透膜的截留率会降低。 相似文献
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赵彦永 《石油化工环境保护》2006,29(2):1-4
为满足可持续发展的需要,燕化公司将其炼油污水的再生水除盐处理后回用于锅炉。从处理工艺的选择,到工艺设计、开车运行,为再生水除盐回用提供了经验。 相似文献
5.
In Brazil most Construction and Demolition Waste (C&D waste) is not recycled. This situation is expected to change significantly, since new federal regulations oblige municipalities to create and implement sustainable C&D waste management plans which assign an important role to recycling activities. The recycling organizational network and its flows and components are fundamental to C&D waste recycling feasibility. Organizational networks, flows and components involve reverse logistics. The aim of this work is to introduce the concepts of reverse logistics and reverse distribution channel networks and to study the Brazilian C&D waste case. 相似文献
6.
This paper presents result from an economic and technical point of view evaluation study, which has sought to establish the potential for replacing well-water that is currently used at the Piaggio industrial plant in Pontedera with recycled wastewater. The study is based upon a pilot wastewater treatment plant, which has been used to test wastewater treatment processes and to compare with achieved quality of recycled waters with that of water drawn on-site from physical/chemical pre-treatment and end with a reverse osmosis and air stripping stage. However, after the physical/chemical pre-treatment, the first option uses oxidation with ozone followed by activated carbon filtration, whereas the second method uses ultrafiltration. The first method is more effective at reducing chemical oxygen demand (COD) whereas the second method is more effective in removing bacteria. Nonetheless, both methods deliver water for re-use of a quality comparable with or better than that of well-water. In principle, the reverse osmosis permeate from either process could be re-used in all production phases at the industrial plant. However, the method base upon oxidation with ozone followed by activated carbon filtration is preferred, because, the process is simpler and continuous. The economic analysis of this process gives an estimated cost of Euro 0.55 per m3 for treated water. This compares favorably with other treatment processes and with the cost of other forms of water supply, which are projected to increase in any case. 相似文献
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采用蒸发-固化工艺处理垃圾渗滤液反渗透浓缩液。蒸发工艺可将反渗透浓缩液减量化,固化工艺可将蒸发残留液中的污染物稳定化。研究表明,蒸发残留液宜采用水泥和石灰混合料进行固化,混合料最佳水泥与石灰质量比约为1︰2,每100 mL蒸发残留液(质量约为120 g)最佳投加量为50 g。固化体含水率低于40%,抗压强度高于1.0 MPa,适合填埋处置,其浸出液污染物含量较低。采用硅酸钠和硫酸钙作为添加剂可加快固化速度,提高固化体的抗压强度。利用蒸发-固化工艺处理反渗透浓缩液可取得良好的经济和社会效益。 相似文献
9.
根据单步反应机理(仅包括燃料的氧化),建立了一维非稳态燃料填充床反向阴燃的数学模型。通过简化模型参数及大活化能渐近分析,得出了定性描述燃料反向阴燃传播的两个方程。结果表明:随着空气流量的增大,阴燃温度是不断上升的,但由于受到反向空气风流的影响,阴燃温度的增长幅度是逐渐变小的;阴燃传播速度却呈现出先增大后减小直至熄灭的变化趋势。这种变化趋势与前人的实验结果相一致。通过定性分析得出:在气体流量为零的情况下,燃料仍然可以发生阴燃,而维持阴燃不断传播所需要的氧气量源于反应区域周围气体的扩散。此外,也分析了燃料特性参数(如密度、孔隙率、比热、导热系数及活化能)对燃料阴燃温度和阴燃速度传播的影响。 相似文献
10.
Determining advanced recycling fees and subsidies in "E-scrap" reverse supply chains 总被引:3,自引:0,他引:3
Primarily due to environmental concerns and legislative mandates, the disposition of end-of-life (EOL) electronics products has attracted much attention. Advanced recycling fees (ARFs) and government subsidies may play important roles in encouraging or curtailing the flows of recycled items. We present a Stackelberg-type model to determine ARFs and socially optimal subsidy fees in decentralized reverse supply chains where each entity independently acts according to its own interests. The model consists of one leader (the government) and two followers (a group of manufacturers, importers, and sellers (MISs) and a group of recyclers). To maximize social welfare, the government determines the ARFs paid by MIS and the subsidy fees for recyclers when MIS sells new products and recyclers process EOL products. We find that MIS and recyclers behave at the equilibrium status by choosing optimal selling quantity in the market and optimal reward money for customers bringing EOL products to recyclers. Under this approach the two fees achieve the maximum of social welfare at the equilibrium status, while both MIS and recyclers gain the maximum of profits. For comparative purposes, we also develop a conceptual model describing the current practice by which ARFs and the subsidy fees are determined on the basis of fund balance between revenues and costs along with recycling operations. We conclude that our results outperform current practice. 相似文献