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首页> 外文会议>2006 WQTC (Water Quality Technology Conference) >Impact Assessment of Quartz Sleeve Cleaning System Interruption in a Medium Pressure Ultraviolet Disinfection Reactor
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Impact Assessment of Quartz Sleeve Cleaning System Interruption in a Medium Pressure Ultraviolet Disinfection Reactor

机译：中压紫外线消毒器中石英套清洗系统中断的影响评估

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With the recent Federal Register publication of the Long Term 2 Enhanced Surface Water Treatment Rule (LT2), improved protection against resistant pathogens is mandated and focus is shifting onto meeting the requirements and practical constraints associated with solution options. One technology well-suited for meeting LT2 guidelines is disinfection by ultraviolet (UV) irradiation, which has proved effective against a range of microbial pathogens. A concern with UV treatment is the potential for performance reductions associated with fouling of the quartz sleeves that encase UV lamps. As mineral and particulate materials accumulate on sleeve surfaces, the effective lamp sleeve transmittance decreases, reducing the efficacy of the disinfection process. Chemical and mechanical sleeve wiping systems aid in removal of lamp sleeve fouling materials, but there can be uncertainty in determining to what extent these potentially costly systems may be necessary to ensure adequate UV exposure, and how often they should be activated to maintain adequate reactor function. Information is also limited with respect to the fouling effects that could be anticipated if sleeve wiping measures were interrupted. Experiments utilizing a commercial medium pressure (MP) UV disinfection reactor installed at the City of Albany, New York's Loudonville UV Treatment Facility were conducted to assess the effects of an interruption to sleeve wiping. The surface water source used had relatively low concentrations of the dissolved minerals sometimes associated with problematic sleeve fouling. Effects of sleeve wiping interruption were assessed by monitoring the temporal distribution of UV dose, and by post-experimental analysis of lamp sleeves. The UV transmittance of both clean and fouled sleeves was characterized over the germicidal UV wavelength range, and chemical analysis of lamp sleeves was performed to quantify metals content on sleeve surfaces. An analysis of spatial distribution for sleeve transmittance demonstrated that in this perpendicularflow MP reactor, fouling was relatively uniform along the length of quartz sleeves. Sleeve transmittance at a wavelength of 254 nm decreased from approximately 92 % to 61% (relative to air) after four weeks. Transmittance data were also collected at other wavelengths relevant to reactors utilizing MP lamps. Flow rate and reported dose data were used to estimate reductions in UV irradiance, and over the experiment duration of 4 weeks, the average reported dose decreased by 9.5%.
机译：随着最近《联邦公报》发布的《长期2增强地表水处理规则》（LT2），强制要求增强对耐药性病原体的防护，并且关注点将转移到满足与解决方案选项相关的要求和实际约束上。一种非常适合满足LT2准则的技术是通过紫外线（UV）照射进行消毒，已证明对多种微生物病原体有效。与紫外线处理有关的一个问题是与封装紫外线灯的石英套管结垢有关的性能下降的可能性。随着矿物和颗粒材料积聚在套筒表面上，有效的灯套筒透射率会降低，从而降低了消毒过程的效率。化学和机械套筒擦拭系统有助于去除灯套筒上的污垢物质，但是在确定这些潜在昂贵的系统对确保足够的紫外线暴露可能需要达到何种程度以及应该多长时间激活一次以维持适当的反应器功能方面可能存在不确定性。关于如果套筒擦拭措施被中断可能产生的积垢影响的信息也很有限。使用安装在纽约州奥尔巴尼市Loudonville紫外线处理设施中的商用中压（MP）紫外线消毒反应器进行了实验，以评估中断擦拭套管的影响。所使用的地表水源中溶解的矿物质的浓度相对较低，有时与有问题的套管结垢有关。通过监测紫外线剂量的时间分布以及对灯套进行实验后分析，评估了套擦中断的影响。在杀菌的紫外线波长范围内，对干净的和污损的套管的紫外线透过率进行了表征，并对灯套管进行了化学分析，以量化套管表面的金属含量。套管透射率的空间分布分析表明，在此垂直流MP反应器中，沿石英套管的长度结垢相对均匀。四周后，在254 nm波长处的套筒透射率从大约92％降低到61％（相对于空气）。在与使用MP灯的反应堆有关的其他波长下，也收集了透射率数据。流速和报告的剂量数据用于估计紫外线辐照度的降低，并且在4周的实验持续时间内，报告的平均剂量降低了9.5％。

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