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PEI络合-超滤耦合过程分离铜和锌废水的研究 总被引:1,自引:0,他引:1
水溶性聚合物络合-超滤耦合过程是一种新型、环保处理工业废水的方法。它不但能够实现废水回用和重金属浓缩,而且能有效地分离二元重金属混合液。选取高效、环保的络合水处理剂聚乙烯亚胺(PEI),对含铜、锌的二元重金属废水进行络合-超滤耦合过程研究,探讨了pH值、装载量比L、离子强度等对超滤过程的影响;pH=7时,PEI对Zn2 和Cu2 的络合容量分别为KCu=0.10mgCu2 /mgPEI,KZn=0.06mgZn2 /mg PEI。随PEI浓度增加,超滤膜通量J=35~45L/(m2·h)。 相似文献
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络合超滤过程处理重金属工业废水 总被引:14,自引:1,他引:14
以废水回用为目的,研究了络合 超滤耦合过程处理重金属工业废水。利用聚丙烯酸(PAA)为络合剂和含Zn2+和Cu2+的重金属废水,讨论了各种因素,如操作压力、膜面流速、重金属与络合添加剂的质量比、pH、体积浓缩因子对超滤过程的影响。在NaCl或Na2SO4存在的条件下,对Zn2+和Cu2+仍可达到100%的去除。在较高的离子强度下,如0.203mol/L时,对Zn2+和Cu2+的截留率仍可达到95%以上。经过浓缩的重金属废水,可回收重金属,而透过液可达到回用水的标准。 相似文献
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以废水回用为目的 ,研究了络合 -超滤耦合过程处理重金属工业废水。利用聚丙烯酸( PAA)为络合剂和含 Zn2 + 和 Cu2 + 的重金属废水 ,讨论了各种因素 (如操作压力 (Δp)、膜面流速( VL)、重金属浓度与络合剂添加浓度比 ( L)、p H、体积浓缩因子 ( VCF) )对超滤过程的影响。在 Na Cl或 Na SO4存在的条件下 ,对 Zn2 + 和 Cu2 + 仍可达到 1 0 0 %的去除。在较高的离子强度下 ,如离子强度为 0 .2 0 3mol/L时 ,对 Zn2 +和 Cu2 +的截留率仍可达到 95 %以上。经过浓缩的重金属废水 ,可回收重金属 ,而透过液可以达到回用水的标准 相似文献
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膜技术在水处理中的应用(上) 总被引:1,自引:0,他引:1
综述了超滤、微滤、液膜、动态膜等膜技术在含油废水、生活废水、重金属废水处理中的应用。如超滤膜可用于处理含油废水、分离悬浮颗粒等。 相似文献
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近年来,超滤技术在废水净化及废水再生等方面取得了不少新成果,有着广阔的应用前景。综述了超滤技术在重金属废水、食品工业废水、纺织印染工业废水、含油废水、生活污水及其它领域中的研究概况,展示了该技术在相应废水处理中的发展趋势。 相似文献
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本文简单回顾了利用超滤技术处理纺织废水的概况,重点介绍和评述了国内超滤技术在洗毛废水回收羊毛脂、退浆废水回收聚乙烯醇及中长纤维油剂回收等几个方面的应用。 相似文献
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乙烯酮(双乙烯酮)是十分重要的化工中间体,其下游产品较多。江苏某化工厂开发生产乙烯酮(双乙烯酮)下游产品三十多个,年生产规模三万多吨,是国内以乙烯酮(双乙烯酮)为中间体生产精细化学品的综合骨干企业。针对乙烯酮(双乙烯酮)下游产品废水特点,该厂结合企业实际,开展了产品优化,结构调整,清洁生产,资源循环利用,节水降耗等工作,从源头削减了污染物的生产。同时投资二千多万元新建预处理装置三套,6000m3/d废水生化处理装置一套,使全厂乙烯酮(双乙烯酮)下游产品的废水得到了有效的治理。 相似文献
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D. G. Gordeev L. F. Gudarenko M. V. Zhernokletov V. G. Kudel’kin M. A. Mochalov 《Combustion, Explosion, and Shock Waves》2008,44(2):177-189
A semi-empirical equation of state for metals is described. Its capabilities are demonstrated by the example of the equation
of state for aluminum. New experimental data are presented on the location of the isentrope of aluminum for unloading from
the state at p = 229.71 GPa on the shock adiabat to an aerogel (SiO2) of density 0.08 g/cm3.
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Translated from Fizika Goreniya i Vzryva, Vol. 44, No. 2, pp. 61–75, March–April, 2008. 相似文献
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The objective of the study was to explore the effect of the degree of deacetylation (DD) of the chitosan used on the degradation rate and rate constant during ultrasonic degradation. Chitin was extracted from red shrimp process waste. Four different DD chitosans were prepared from chitin by alkali deacetylation. Those chitosans were degraded by ultrasonic radiation to different molecular weights. Changes of the molecular weight were determined by light scattering, and data of molecular weight changes were used to calculate the degradation rate and rate constant. The results were as follows: The molecular weight of chitosans decreased with an increasing ultrasonication time. The curves of the molecular weight versus the ultrasonication time were broken at 1‐h treatment. The degradation rate and rate constant of sonolysis decreased with an increasing ultrasonication time. This may be because the chances of being attacked by the cavitation energy increased with an increasing molecular weight species and may be because smaller molecular weight species have shorter relaxation times and, thus, can alleviate the sonication stress easier. However, the degradation rate and rate constant of sonolysis increased with an increasing DD of the chitosan used. This may be because the flexibilitier molecules of higher DD chitosans are more susceptible to the shear force of elongation flow generated by the cavitation field or due to the bond energy difference of acetamido and β‐1,4‐glucoside linkage or hydrogen bonds. Breakage of the β‐1,4‐glucoside linkage will result in lower molecular weight and an increasing reaction rate and rate constant. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 90: 3526–3531, 2003 相似文献
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Jorge Marcelo Romero Soledad Bustillo Hugo Enrique Ramirez Maisuls Nelly Lidia Jorge Manuel Eduardo Gómez Vara Eduardo Alberto Castro Alicia H. Jubert 《International journal of molecular sciences》2007,8(7):688-694
A thermochemical rather simple experimental technique is applied to determine the enthalpy of formation of Diperoxide of ciclohexanone. The study is complemented with suitable theoretical calculations at the semiempirical and ab initio levels. A particular satisfactory agreement between both ways is found for the ab initio calculation at the 6–311G basis This set level. Some possible extensions of the present procedure are pointed out. 相似文献
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醋酸纤维素取代基分布与性质的关系 总被引:9,自引:0,他引:9
分析了以吡啶为溶剂的醋酸纤维素的13C-NMR核磁共振谱,得出了三种不同位置羟基的取代度。结合X—射线和DSC分析,初步说明具有相同取代度但未经水解和经过水解的醋酸纤维素(CA) 性质上的差异是由于三个羟基上的取代度分布不同及消晶程度差异所致。 相似文献
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1 INTRODUCTIONBecause of importance of equations of state (EOS)in science and industry,hundreds forms of EOS havebeen presented since latter 19th century.It seems impossible to develop a general equation covering vari-ous kinds of EOS.But for cubic EOS,several generalequations have been reported already. Martin presented the first general equation whichis following p=RT/V-α(T)/(υ β)(υ γ) δ(T)/υ(υ β)(υ γ) (1) Kumar et a1.presented an equation called the most general form of a density-cubic or, alterna tively,volume-cubic mathematical equation,the form of which is as follows 相似文献