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城市污水二级处理出水回用于循环冷却水系统的防腐防垢研究
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摘要
随着水环境污染日益严重,水资源短缺已成为火电工业发展的制约因素。城市污水由于其来源的稳定性和可靠性,成为电厂可以利用水源之一。目前城市污水回用作工业循环冷却水补充水的工艺研究大都建立在对已经进行了二级处理的城市污水再进行深度处理的基础上,以使深度处理后的污水达到循环冷却水水质标准。城市污水处理厂二级出水直接回用于工业冷却水会引起系统设备腐蚀、结垢、微生物滋长等技术问题。在这样的背景下,本文主要进行了以城市污水处理厂二级生物出水为处理对象,以达到回用于火力发电厂循环冷却水为目的,以MBR+弱酸阳离子交换器为处理技术,对实际工程应用进行了研究。
     论文首先分析了城市污水二级处理出水与循环冷却水水质之间的差异及造成设备严重腐蚀的因素。利用静态挂片试验,研究了城市污水二级处理出水在不同浓缩倍率下对316L不锈钢的腐蚀影响。然后利用电化学交流阻抗法和动电位扫描法就模拟冷却水中316L不锈钢的耐蚀性能影响因素展开了研究。最后论文还利用自行设计的小型动态模拟装置,对城市污水二级处理出水直接回用于循环冷却水系统后的水质变化规律进行研究。
With pollution of water resource being serious day by day, the shortage of the water resource has already become the restriction factor of the electric industrial development of fire. Because the municipal sewage is because of the stability and dependability of its source, becoming the power plant can utilize one of the sources of water .At present, studies on reusing municipal wastewater as industrial cooling tower makeup water are on the base of advanced treatment for secondary sewage effluent, so as to meet the demand of industrial cooling water. Using the secondary treated sewage effluent of municipal wastewater plant as cooling water direct will lead to us lots of question such as : equipments' corrosion, scales and sterilization etc. Under such an backgrounds, this paper go on and leave target of punshing on water with city sewage treatment plant mainly. Regard achieving the purpose back to using in the circulation cooling water of thermal power plant as, adopt experimental study that the lime technology carries on the MBR+ weak acid cationic ion-exchange treatment sistem, And has carried on successful application in the actual project.
    So ,at first, the differences between the quality of secondary treated sewage and quality of recycling cooling water and components of water causing equipments corrosion seriously are analyzed respectively in this paper. Through static weight-lost method, the rates of the 316L stainless still corrosion are studied in secondary treated sewage water.Then the article describing the formation and growth process of the passive film on the 316L stainless steel in simulated cooling water. The main factors related to anti-corrosion properties and a new electrochemical method of evaluating the efficiency of the scale inhibitors are studied with anodic polarization curves and EIS method. We also design a simulated system in miniature to study inhibiting corrosion of equipments of the cooling system. The variety of components in cooling water is studied with different concentration rates.
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