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首页> 外文期刊>Australian journal of water resources >A Case Study Of The Improvements Gained In Conduit Efficiency By Cleaning A Biofouled Pipeline
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A Case Study Of The Improvements Gained In Conduit Efficiency By Cleaning A Biofouled Pipeline

机译：清洁生物污染管道改善管道效率的案例研究

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The hydraulic performance of pipelines can be significantly affected by the presence of biological growth on internal surfaces. The change in wall roughness brought about by biofilms has been studied by the use of headloss tests, pre- and post-cleaning, of a low pressure hilltop pipeline of a Hydro Tasmanian hydroelectric scheme. Results of the headloss tests show that improvements to hydraulic efficiency can be achieved from the cleaning of biofouling material, and that identifying the flow velocities at which hydraulically smooth, transitional or rough conditions occur can aid in optimising the operating characteristics of the conduit. Results show both reductions in headloss and improvements in power output at the powerstation at given flow rates. The data when plotted in the style of a Moody diagram shows that the friction law, roughened by biological growth, is observed to deviate from the Colebrook-White relationship, although the results are too narrow in Reynolds number to be conclusive. It was found that bacteria made up the majority of the biofilm biomass in the pipeline studied. Based on molecular analysis, members of the class Alphaproteobacteria were the most frequently detected followed by members of the phylum Chloroflexi. Chemical analyses found high levels of iron, manganese and aluminium in the biofilm.
机译：管道的水力性能会受到内表面生物生长的影响。通过使用塔斯马尼亚水电计划的低压山顶管道的水头损失测试，清洁前和清洁后，研究了由生物膜引起的壁粗糙度变化。水头损失测试的结果表明，可以通过清洁生物污垢材料来提高水力效率，并且确定出现水力平稳，过渡或恶劣条件的流速可以帮助优化管道的运行特性。结果表明，在给定的流速下，水头损失的减少和发电站功率输出的改善。以穆迪图的形式绘制的数据表明，由于生物生长而变粗糙的摩擦定律与Colebrook-White关系有偏差，尽管结果雷诺数太窄而无法得出结论。发现在研究的管道中细菌构成了生物膜生物质的大部分。根据分子分析，最常检测到甲丙酸杆菌属成员，其次是叶绿菌门。化学分析发现生物膜中铁，锰和铝的含量很高。

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