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液膜分离技术在废水处理中的应用 总被引:9,自引:0,他引:9
综述了液膜分离的原理及该技术在废水处理领域中的研究进展和应用实例,介绍了静电式准液膜,离子交换膜支撑液膜和乳状液膜包酶的液膜分离技术。 相似文献
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聚偏氟乙烯中空纤维疏水膜及其初步应用 总被引:1,自引:0,他引:1
使用聚偏氟乙烯中空纤维疏水膜,比较了三种膜蒸馏过程用于质量分数为3.5%的氯化钠溶液的脱盐效果。实验结果表明:真空膜蒸馏的通量最大,达到21.8kg/(m^2·h),其次为直接接触式膜蒸馏,气扫式膜蒸馏的通量最小;三种膜蒸馏过程的脱盐率均在99.99%以上;膜蒸馏通量随膜内径增加略有增加,与膜壁厚呈反比。真空膜蒸馏法可用于反渗透浓水的进一步处理,当反渗透浓水浓缩4倍时,原水电导率从5980μS/cm增加到22800μS/cm,膜蒸馏产水电导率保持在1.8~1.9μS/cm以内,脱盐率大于99.99%。 相似文献
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介绍了TiO2光催化技术在废水处理应用研究中取得的快速发展.针对TiO2在废水处理过程中出现的光生电子空穴易复合和难回收等问题,综述了通过对TiO2进行掺杂负载改性和形态的改性使其达到可见光响应功能的研究进展;综述了通过固载磁载等方法使TiO2达到可分离易回收功能的研究进展.对TiO2光催化技术在废水处理领域的未来研究方向进行了展望. 相似文献
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介绍了含磷废水中磷的主要形态;综述了吸附法、化学沉淀法、结晶法等低含磷废水处理技术的研究现状,以及各种超低磷废水处理方法所能达到的最低浓度;例举了几种已商业化应用的低磷废水处理技术的应用实例。 相似文献
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高效菌处理难降解有机工业废水研究进展 总被引:2,自引:0,他引:2
总结了高效菌在造纸、印染、化丁、农药、制药等工业有机废水处理中的研究现状;认为大力开展和加强高效菌的选育和应用工艺研究,是生物强化技术领域今后的发展方向。 相似文献
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调查了使用膜材料的化工废水回用工程的若干案例后,总结了目前使用膜材料化工废水回用工程的经验和教训。为使化工废水回用目标顺利实现,应做到:要认认真真地做试验,要以试验为基础;按科学研究的规律,开发废水回用的全流程技术;明确职责,开好车,加强装置的日常操作管理;开发、使用有针对性的清洗约剂;充分利用废水处理的成熟技术。建议新建项目废水处理的目标应直接定在回用,而不是达到排放标准;膜材料、废水回用技术术语、使用标准等应规范化,制定、修订废水回用于锅炉补充水、循环冷却补充水、杂用水的水质标准。 相似文献
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超声波技术降解水中氯代有机物的研究进展 总被引:2,自引:0,他引:2
介绍了超声波技术的基本原理,概述了超声波和各种超声联用(超声波与紫外光、过氧化氢、臭氧、Fenton试剂等联用)技术降解氯代有机物的效果和影响因素,总结了氯代有机物降解机理与动力学的研究进展,并在此基础上提出了今后超声波及其联用技术降解水中氯代有机物的研究方向。 相似文献
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John F. Haasbeek 《补救:环境净化治理成本、技术与工艺杂志》1994,4(3):331-341
Under the purview of EPA's Remedial Engineering Management (REM III) Superfund contract, a CERCLA RI/FS was performed at the Pinettes Salvage Yard site located in Washburn, Maine (EPA Region I). The purpose of the RI/FS was to fully characterize the nature, extent, and fate and transport of PCB contamination resulting from an alleged surface spill of transformer dielectric fluid containing Arochlor 1260 (a polychlorinated biphenyl) and various volatile and semivolatile organic constituents. The RI/FS was performed subsequent to both an immediate removal action (IRA) and a deletion remedial investigation (DRI) performed by EPA contractors. Results of both efforts indicated that the site was unsuitable for deletion from the National Priorities List (NPL) because the site soils contained elevated levels of PCBs. This article presents a case history of the extensive field investigations performed to characterize the contaminant source and evaluate the fate and transport of PCBs in site soils. These investigations included on-site mobile laboratory gas chromatograph (GC) analytical techniques for PCBs and targeted volatile and semivolatile organic compounds; confirmatory Contact Laboratory Program (CLP) laboratory analyses of soils, sediments, surface water, and groundwater samples; statistical analyses and correlation of field mobile laboratory GC data with CLP laboratory analytical results; and an evaluation of the potential effects of cosolvency in the fate and transport of PCBs in subsurface soils. 相似文献
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The research concerns the Wielkopolski National Park (West Poland), which suffered a huge human impact in the 1970s and 1980s
owing to the nearby location of an industrial plant. Since then, fundamental technological changes that it introduced into
its production of phosphate fertilizers have radically reduced the amount of pollution emitted. A three-year study (2002–2004)
of fluorides in precipitation in open terrain and under tree crowns showed their concentrations to range from levels below
the detection limit (0.003 mg/l) to 0.560 mg/l. Those registered under tree crowns were several times higher and indicated
substantial dry deposition of fluorides on the trees. The highest values were recorded in 2003, with 43% of samples ranging
from 0.01 to 0.05 mg/l, and with 51% of throughfall ranging from 0.10 to 0.50 mg/l. A strong connection was shown to exist
between fluoride and sulphate concentrations in the precipitation. An analysis was made of the available data on F concentrations
in the air and the dust levels around the factory, but these figures did not show an unequivocal effect on F concentrations
in precipitation. A great similarity was found to occur between the fluoride content in rainwater in the Wielkopolski National
Park and in the centre of the nearby Poznań metropolitan area, which indicates that there are also other F sources besides
the local factory. 相似文献
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刘敏清 《再生资源与循环经济》2012,5(6):23-25
广州市作为国家再生资源回收体系建设试点城市,在大力发展循环经济、推进再生资源回收利用网络体系建设方面进行了先行先试探索,取得了明显成效。“广州模式”对推进广东省加快转型升级具有启示借鉴意义。 相似文献
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Within the European monitoring network (EMEP, ) several different sampling procedures for measuring the main air components have been applied. This has contributed to systematic
concentration differences and a comparability problem. Since 1997 co-located experiments in 15 countries have been carried
out to quantify these differences. In addition, three major measurement campaigns were organized by EMEP between 1985 and
1991. Differences among results depend on the concentration level and methods used. The decrease in SO2 concentrations over the last twenty years has placed greater demands on the methodology. Absorbing solutions methods for
SO2, (H2O2 and tetrachloromercurate (TCM)) typically have higher detection limits than the reference method, which uses KOH impregnated
filters. The TCM method also has problems with negative interference, especially in summertime. UV fluorescence monitors have
in a few cases proven to give good results, but interferences, detection limit and poor maintenance can be problems. For NO2, many countries are using the TGS absorption solution method, which has a higher detection limit than the reference method
using NaI impregnated glass sinters. The Salzmann method gives unreliable results at concentrations below 1 μgN/m3, and even at higher concentrations the uncertainty is rather unsatisfactory. The chemiluminescence monitor with molybdenum
converters tends to systematically overestimate NO2 concentrations, possibly because zero-drift problems and the non-specific response to NO2. Particulate sulphate measurements in general have lower bias and uncertainties than gas and other aerosol measurements. 相似文献
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Assessment of the leaching of metallic elements in the technology of solidification in aqueous solution 总被引:2,自引:0,他引:2
Results are presented of experiments performed to optimize the solidification/stabilization system for metallic elements in aqueous solution. This system involves mixing cement and a solution of metallic elements in a conventional mixer: the paste thus obtained is transferred drop by drop into a recipient filled with an aqueous solution of NaOH at 20% by weight, in which it solidifies immediately. The separate use of chloride solutions of Li+, Cr3+, Pb2+ and Zn2+ makes it possible to obtain granules displaying various levels of compressive strength. Three different inertization matrices were used in the experiments, the first consisting solely of Portland cement, the second of Portland cement and a superplasticizer additive, and the third of Portland cement partially replaced with silica-fume and superplasticizer. The results of the tests performed showed a very low level of leaching into the alkaline solidification solution for Cr3+, the quantity leached being under 2% as against higher levels for the other metallic elements. For all the considered elements, the best results were obtained by using silica-fume in the inertization matrix. 相似文献
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李湘洲 《再生资源与循环经济》2012,5(1):30-33
介绍了我国电子垃圾回收利用存在的问题与现状、国外可供借鉴的经验,以及电子垃圾分类情况,最后提出我国电子垃圾再生利用的产业化发展方向。 相似文献
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This work investigates the colloid-facilitated migration of radionuclides with radioactive decay in porous media. The sorption processes for radionuclides with both the solid matrix and colloids are treated as equilibrium or nonequilibrium. An analytical solution is obtained from a simplified linear equilibrium interaction mechanism. In addition, the adsorption processes for radionuclides with colloids and porous rock can be assumed as nonequilibrium and modeled by the linear kinetic adsorption. The numerical method is employed to solve the coupled colloid and radionuclide transport equations under nonequilibrium sorption assumption. Moreover, the reaction rates of the adsorption processes for radionuclides with the solid matrix and colloids affect the transport characteristics of radionuclides. The fast reaction rate of radionuclides with colloids causes a higher concentration of radionuclides adsorbed on colloids in a dispersed phase and enlarges acceleration caused by colloids. However, the fast reaction rate for radionuclides with solid matrix increases the retardation effect caused by the solid matrix. This work developed a predictive model for the transport of colloid-facilitated radionuclides in porous medium and to assess the importance of various phenomenological coefficients, particularly parameters for the adsorption interactions. 相似文献