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煤基合成油废水通常采用生物处理,但出水COD与色度难以达到排放标准。提出"两级好氧+混凝沉淀+臭氧氧化"工艺技术,以提高COD和色度的去除率。研究结果表明:该废水经两级好氧生物处理后,COD去除率为87.3%;混凝沉淀过程中絮凝剂PAC(聚合氯化铝)与PAM(聚丙烯酰胺)的最佳投药量分别为750.0mg/L和3.5mg/L,COD去除率为42.6%;通过臭氧氧化,色度去除率在90.0%以上。因此该废水通过以上工艺处理后,其出水COD与色度指标均能达到《污水综合排放标准》(GB 8978-1996)一级标准要求。 相似文献
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为保护下游白洋淀地表水及地下水的水质,以高阳县印染废水为处理对象,对高阳污水处理厂的工艺和运行参数进行了优化和调试。采用混凝沉淀-水解酸化/曝气池-曝气生物滤池-活性砂滤为处理工艺,设计处理规模为12万m3/d,当进水的COD,SS,NH3-N和TP的质量浓度分别为669,424,8.83和6.03mg/L时,经该工艺处理后其最佳去除率分别为93.5%,98.8%,97.1%和96.2%,出水水质达到《城镇污水处理厂污染物排放标准》(GB 18918-2002)一级A标准,其运行成本仅为0.807元/m3。工程的建设和运营不仅改善了周围环境,而且促进了区域经济发展,工艺的设计和运行参数为印染废水处理行业提供了重要参考。 相似文献
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介绍了一种用于处理汽车油罐车容量检定过程中产生的含油污水的工艺,在不使用化学药剂的条件下,采用"重力分离-气浮-粗粒化-过滤"的工艺流程来处理含油污水。具体流程如下:初步处理为集水池的一级沉降处理;深度处理分为二级除油处理和三级除油处理,二级处理是指采用重力分离法(隔油池)进行油水分离的处理阶段,三级处理是指采用气浮、聚结、过滤等方法或组合工艺进行油水分离的处理阶段。 相似文献
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根据日本工业标准JISZ1707-1975中食品包装用塑料薄膜制成小袋,注入40℃的饱和食盐水溶液,密封后,在规定的温度和时间内进行处理,然后观察小袋是否变形,复合物是否有脱层,热封部是否有剥离,以此来判定耐热性,耐热性共分1-6级,其温度和时间是120℃/60秒、110℃/60秒、100℃/60秒、100℃/30秒、90℃/30秒和70℃/30秒. 相似文献
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企业战略管理模型:战略—文化—结构 总被引:14,自引:0,他引:14
在企业环境日益复杂多变的今天,如何从战略上管理企业已成为一个迫切而重要的问题。本文首先指出战略管理时代的来临,并认为企业战略管理实质上是指对企业的战略性管理。在此基础上,提出了一个以战略、文化、结构为顶点的企业战略管理三角形模型,并阐述了该模型的理论和实践意义。 相似文献
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This paper focuses on the joint pricing and procurement of fashion products in the existence of clearance markets. It is assumed that the expected regular season demand is a linear decreasing function of the price and the end of period excess inventory is sold at a known discounted price in a clearance market where the demand is a random variable that follows a general distribution. It is shown that the expected profit function is unimodal and the optimal procurement quantity and price can be found from the first order conditions. Existence of a clearance market increases the profit, price, and the procurement quantity. In order to prove this, the optimal procurement and pricing policy of a price-setting retailer who does not have a clearance market is provided. As opposed to the literature, it is shown that the expected profit function of this problem is unimodal as well. A numerical study demonstrating the magnitude of the increase in profit, procurement quantity, and price is reported. 相似文献
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Philip A. Scarf Cristiano A.V. Cavalcante 《International Journal of Production Economics》2012,135(1):372-381
Heterogeneity in component and maintenance quality is considered in the context of age-based inspection and replacement for a single component system. A three-state component failure model is assumed, with a defective state preceding the failed state. Heterogeneity in maintenance intervention is modelled by supposing that inspections may induce the defective state. Component heterogeneity is modelled by supposing that the population of components comprises a mixture of the weak and strong, and that the mixing proportion and cost of components vary between suppliers. Within this framework, the impact, on system reliability and cost, of switching component or maintenance supplier is determined. Broadly, our finding is that one is much more inclined to switch supplier in order to obtain higher quality maintenance than to obtain higher quality components. A gas pressure control valve is used to illustrate our ideas. 相似文献
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炉篦条是冶金设备烧结机上的一个重要零件,对铸件技术要求高,工作面不允许有铸造缺陷,采用消失模铸造生产炉篦条是一种先进、高效的生产工艺。针对原消失模铸造工艺经常出现的夹渣、夹砂等问题以及铸件报废的原因,在对原工艺认真分析的基础上对炉篦条铸件铸造工艺进行了优化:改变铸件浇冒口的设计,将原来的2个冒口向铸件长度方向的中间靠近;将铸件在浇注位置方向上的工作面朝下,以保证工作面的铸造质量;从管理、工艺实施和监督检查方面进行严格控制,消除气孔,保证涂料烘干,防止涂料返潮。通过优化铸造工艺,有效提高了生产效率,降低了生产成本。批量生产也证明了优化工艺性能稳定,产品质量可靠。 相似文献
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