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双膜法在处理循环冷却水系统排污水中的应用 总被引:1,自引:0,他引:1
介绍了超滤和反渗透工艺在处理循环冷却水系统排污水时的运行特点,讨论了影响超滤运行的因素,实际运行表明,超滤出水SDI≤2.5达到反渗透入口水要求,且膜法水处理系统在排污水回用系统中运行时是可靠的和稳定的,膜元件污堵的因素是可以控制的,膜通量经定期清洗后能得到恢复.同时也总结了膜法水处理系统存在的有待改进的问题. 相似文献
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《水处理技术》2016,(5)
采用含盐量、难降解有机物较高的中水作为循环水系统补水,所产生的循环水排污水含盐量达7 200 mg/L以上、难降解有机物含量达37 mg/L以上(以TOC计)、Ca~(2+)在15 mmol/L左右。针对该循环水排污水,现有循环水排污水回用工艺存在回收率低(一般小于50%),处理后出水水质差,膜系统污堵严重、无法稳定运行等问题。针对上述存在问题,根据中水水源循环水排污水水质特点,开发了一种高回收率的中水水源循环水排污水回用工艺,并通过实验对工艺各系统性能、运行参数及处理效果进行研究。研究结果表明,该回用工艺性能稳定,循环水排污水回收率可达90%以上,处理后产水电导率324μS/cm、含盐量150 mg/L,可作为循环水系统补水进行回用。该工艺吨水运行费用为9.65元/t水,具有良好的经济效益和环境效益。 相似文献
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蒋诚 《中国石油和化工标准与质量》2014,(7):265
当前,化工企业水资源短缺问题日益加剧,为了解决这一问题,降低化工企业外排污水对环境的污染,降低排污水的处理成本,本文将循环水排污水作为处理对象,对其进行分析和研究,并探讨循环水处理工艺在循环水排污水回用方面的应用,使化工企业水资源短缺的问题得到有效解决。本文就循环水处理工艺在循环水排污水回用方面的应用展开讨论,分析循环水处理工艺的常见类型及在实际应用中的效果。 相似文献
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介绍了烟台发电厂投入运行的循环冷却排污水的深度处理系统,该系统由预处理、预除盐、一级除盐、深度除盐等部分组成,它以电厂的循环排污水作为水源制取除盐水,与原有的水处理车间的除盐水一起供应烟台市供热管网首站用水和电厂锅炉用水.系统投入运行后降低了循环水的浓缩倍数,改善了循环水的运行工况,解决了电厂中循环水排污水处理难的问题,实现了循环冷却排污水的回收利用,达到了循环水的零排放,提高了水利用率,降低了电厂的水耗. 相似文献
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Manuel Melgosa Guihua Cui Claudio Oleari Pedro J. Pardo Min Huang Changjun Li Ming Ronnier Luo 《Coloration Technology》2017,133(4):273-282
We have used 13 experimental datasets (7420 colour pairs) to study the performance of the weighting function for lightness proposed by the CIEDE2000 colour-difference formula, because it has been suggested that this function can be improved by using the weighting function for lightness SL = 1 adopted by the CIE94 colour-difference formula. Using the standardised residual sum of squares (STRESS) index, it was found that: (i) replacing the SL in CIEDE2000 with SL = 1 improved the results for 7/13 datasets considered, but the improvement was statistically significant only for 1/13 datasets; (ii) a Whittle-type lightness-difference formula can be used to replace the term ∆L*/SL in CIEDE2000, which led to a new colour-difference formula with no statistically significant difference with respect to CIEDE2000 for any of the 13 experimental datasets. A modification of the CIEDE2000 formula using a Whittle-type lightness formula is proposed. 相似文献
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考虑罐式批次成品汽油调和过程中罐底余油对产品质量指标的影响,本文提出了一种基于改进多核模糊C均值(multi-kernel fuzzy C-means,MKFCM)与极端梯度提升树(extreme gradient boosting,XGBoost)集成的成品汽油调和的通用配方建模方法。该方法首先考虑各调和组分的差异性,提出一种自适应核参数计算方法对MKFCM改进,并将其用于罐底油聚类分析,旨在最大程度划分出性质相近的罐底油批次类型;在此基础上择优选用XGBoost算法,以各批次罐底余油的组分比例和产品预期质量指标作为输入,建立各批次子配方模型;在配方生成时,基于改进MKFCM求得当前罐底余油的隶属度向量,并以此为权值对子配方模型进行加权融合,最终以多模型集成的方式得到了成品汽油调和的通用配方。经使用某企业实际工业数据进行实验分析,结果表明,较单一模型或未改进MKFCM的集成模型,基于改进MKFCM-XGBoost的多模型集成配方,预测精度和泛化能力均更优,更适合罐式批次成品汽油调和过程。 相似文献
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研究了硼酸-硫酸铝-白炭黑复合体系浸渍剂对炭电极材料抗氧化性能的影响。首先用单种不同浓度的浸渍剂(硼酸、硫酸铝和白炭黑)处理碳电极样品,在800℃静态空气下进行氧化失重实验,考察上述浸渍剂的含量对炭电极氧化失重率的影响。结果显示,随着硼酸浓度的增加,炭电极的失重率基本上呈下降趋势,浓度大于4%后减少变弱;随着硫酸铝浓度的增加,炭电极的失重率先减小后增大,浓度为6%最好;随着白炭黑浓度的增加,炭电极的失重率亦先减小后增大,以浓度为1%最佳;然后基于上述结果,进行配方正交实验设计,采用三因素四水平正交设计方案,通过极差计算对正交实验结果进行分析,确定最佳配方为硼酸、硫酸铝、白炭黑配比为5∶4∶1。最后,实验研究了浸渍次数对炭电极材料的抗氧化性能的影响。此外对炭电极抗氧化机理进行初步分析。 相似文献
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There is a need to determine whether there is a dietary requirement for docosahexaenoic acid (DHA, 22:6n-3) by term infants
to achieve their full developmental potential. Studies of brain fatty acid composition demonstrated that infants who were
breast fed had greater levels of cerebral cortex DHA than did infants who were formula fed, suggesting that DHA in the cerebrum
is dependent on a supply in the diet. Some physiological studies reported that electrophysiological and behavioral assessments
of visual function were improved in breast-fed infants relative to those fed formula and that this was related to the length
of breast feeding. While some randomized studies of DHA supplementation of infant formula to term infants demonstrated that
the visual function of formula-fed infants could be improved to breast-fed levels by adding DHA to formula, others failed
to demonstrate an effect. Variations in dietary treatments and methods of assessment make comparison of the studies difficult.
Further work is necessary to rigorously establish if there are long-term benefits of dietary DHA to the term infant. 相似文献