共查询到20条相似文献,搜索用时 78 毫秒
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以2级厌氧发酵生产沼气后的乙醇发酵废水为研究对象,采用微滤、超滤膜分离技术对其进行处理,考察了操作压力对膜分离效果的影响、4种超滤膜对废水COD和色度的处理效果,以及清洗方式对超滤膜通量恢复的影响。结果表明,尼龙66微滤膜在0.15 MPa下对废水COD和色度具有较好的处理效果。选取截留相对分子质量为103的聚酰胺复合膜作为超滤膜。经微滤和超滤膜2级处理后的废水COD和色度分别小于400 mg/L和80,达到GB 27631-2011的间接排放标准。酸洗+碱洗+次氯酸钠溶液组合清洗方式能有效恢复超滤膜通量,其纯水膜通量和废水膜通量分别可恢复至93.74%、91.55%。表明膜分离技术可以有效地处理乙醇废水。 相似文献
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Fenton氧化—吹脱法预处理兰炭废水的研究 总被引:2,自引:0,他引:2
采用Fenton氧化—吹脱法进行了兰炭废水预处理试验研究,分别考察了COD、色度和氨氮的去除效果及其影响因素。结果表明,处理100 mL的兰炭废水时,Fenton氧化的最佳工艺条件为:30%的H2O2投加量为40 mL、n(H2O2)∶n(Fe2+)=20、pH=6;吹脱除氨的最佳工艺条件为:温度为60℃、pH=11;在此条件下,Fenton氧化—吹脱法对COD、色度和氨氮的去除率分别达到了95.72%、95%和88%,废水的可生化性提高了4~5倍。 相似文献
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对采用有机超滤膜处理再生纸废水替代传统工艺的可行性进行了考察,对膜截留相对分子质量、膜材质、压力等对处理效果的影响进行了研究.结果表明,在t=(25±3)℃,p=0.2 Mpa,采用截留相对分子质量50×103的聚砜疏水型膜,其稳态通量可达3.8 L·m-2·h-1,COD的去除率可达82.5%,且处理的废水达到GB 3544-2001规定的排放标准.根据再生纸废水的性质对膜清洗再生进行了考察,聚砜疏水型和亲水型超滤膜纯水通量分别恢复到新膜的89%与86%左右. 相似文献
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通过盐酸对粉煤灰改性,并从中提取改性粉煤灰和酸浸液,将两者联合投加处理皂素废水,考察了pH值、改性粉煤灰投加量、温度和酸浸液投加量四个因素对皂素废水的COD和色度的去除效果。结果表明:在pH=7.0,改性粉煤灰投加量=0.2g/mL,T=20℃,酸浸液投加量(v/v)=3∶10条件下,COD去除率可达61.28%,色度去除率可达73.33%。经过改性后的粉煤灰对皂素废水具有较好的处理效果,可发挥以废治废的作用。 相似文献
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有机膨润土对造纸黑水的处理效果 总被引:1,自引:0,他引:1
利用不同用量十六烷基三甲基溴化铵(CTMAB)对膨润土进行改性制备有机膨润土,并研究了有机膨润土的用量、介质pH值、作用时间等因素对有机膨润土去除造纸废水COD和色度的影响。试验结果表明:在同一影响因素条件下,有机膨润土对造纸废水COD和色度的去除率随着CTMAB用量的增加而增加。在废水COD的质量浓度为952.3mg/L、色度A500为1.015、pH值为2的情况下,有机膨润土用量为20g/L时对COD和色度的去除率分别达到84.7%和99.5%。 相似文献
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膜分离技术处理印染废水的研究 总被引:11,自引:0,他引:11
用MWCO6000的中空纤维超滤膜和反渗透技术处理羊毛印染废水,可使其COD值,色度达标排放。操作压力为0.1MPa,流速为15001/h,经渗透处理后的废水含盐量和色度明显降低。对膜进行清洗时,合适的清洗剂为0.8?TA水溶液,用氢氧化钠或洗衣粉调整pH=10.0。 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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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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A perturbation viscometer is a differential capillary viscometer that measures the logarithmic viscosity gradient of the viscosity-composition curve for gas mixtures. Measurements are made at different gas mixture compositions. Integration of the logarithmic viscosity gradients measured over the full composition range gives the mixture viscosity relative to the viscosity of one of the pure components of the gas mixture. This method is attractive because, for measurements of equal precision, integration of the gradients is potentially an order of magnitude more precise than measurement of the viscosities directly. It can also work at high and low temperatures and perhaps high pressures.The perturbation viscometer has been used to make measurements on ideal gas mixtures at ambient and elevated temperatures. The situation is more complicated when the gas mixtures are non-ideal. Extra effects due to density differences, molar volume change on mixing and differential thermal expansion may be measured in addition to the desired viscosity change producing systematic errors in the results. Thus, a more sophisticated apparatus is required. The standard perturbation viscometer has been modified to separate out the extra effects to permit measurement of the true change in viscosity. In addition, the theoretical operation of the modified apparatus has been revised to account for the design changes to permit calculation of the viscosity-composition profiles from the results.The apparatus has been tested using helium-HFC-125 mixtures and two new viscosity-composition profiles are presented for these mixtures at 23 and . Internal consistency tests have been used to confirm that the data produced are of high quality with an estimated uncertainty in the viscosity ratio data at of 0.9% and at of 1.5%. 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