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Researches on Reclaimed Water Quality Changes and Biofilm Characteristic

机译：再生水水质变化及生物膜特征研究

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Under the certain circumstances of global shortage of freshwater resources, reclaimed water, as a potential water resource, has gained extensive concerned for its sustainability.When there are excessive organic matters in treated water, bacterial regeneration and pipeline corrosion occur, which will severely damage water quality.So the biological stability of water is significant to water quality and safety.As biofilm is commonly found on the wall of reclaimed water pipe due to the limit of water nutrient environment, they have a great impact on the quality and security of water supplement.Effluent of water recycling plant are treated as water source, 4 CDC biofilm reactors in each of 2 groups in series operation are applied to simulate the recycling network system, scanning and detections of ductile iron and PE plate are completed by electron microscopy and XRD.The variation of water quality, formation of biofilm process and the interaction between microorganisms and residual chlorine in reclaim water are studied.Significant differences are observed in biofilm morphology when different tube conditions are applied.Corrosion made the pipe wall become loose and uneven on nodular cast-iron pipe while biofilms on polyethylene pipe were relatively smooth and with certain viscosity.And the structure of the rough biofilm changing with water flow can increase the specific surface area of the biofilm which will promote the growth and the development ofbio-film as well as the removal rate of pollutant.Water recycling is a key element of water resource management.By proper water protection and recycle,we can maintain and conserve freshwater resources, meet people's demands on the environment, achieve the sustainable development of human and nature, and then provide an important guide and practical signifi cance to the improving of reclaimed water reliability.
机译：在全球淡水短缺的某些情况下，中水作为一种潜在的水资源已受到广泛关注，其可持续性。当处理水中有机物过多时，会发生细菌再生和管道腐蚀，从而严重破坏水源。因此，水的生物稳定性对水质和安全性至关重要。由于受水营养环境的限制，在再生水管的壁上通常会发现生物膜，因此它们对补水的质量和安全性有很大影响以循环水处理厂出水为水源，两组串联运行的四个CDC生物膜反应器分别模拟循环网络系统，并通过电子显微镜和XRD对球墨铸铁和PE板进行扫描和检测。水质变化，生物膜形成过程以及微生物与残留氯之间的相互作用在不同的管道条件下，生物膜的形态存在显着差异;腐蚀使球墨铸铁管的管壁变得疏松和不均匀，而聚乙烯管上的生物膜则相对光滑且具有一定的粘度。粗糙的生物膜的结构随水流的变化而变化，可以增加生物膜的比表面积，从而促进生物膜的生长和发育以及污染物的去除率。循环水是水资源管理的关键要素。适当的水资源保护和循环利用，可以维护和保护淡水资源，满足人们对环境的需求，实现人与自然的可持续发展，从而为提高再生水的可靠性提供重要的指导和现实意义。

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