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Laboratory investigation of inorganic fouling of low pressure UV disinfection lamps

机译:低压紫外线消毒灯无机污染的实验室研究

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摘要

Iron(III) (mainly dosed as FeCl3) is one of the main inorganic constituents associated with the fouling of UV lamps during disinfection of wastewater. A low pressure mercury lamp UV system was operated under laboratory conditions to assess the effects of heat and UV light on fouling. Iron(III) was dosed at different concentrations and fouling was monitored by measuring the UV irradiance. The potential for ferric phosphate fouling and the effects of organics were also studied. Results showed that fouling did not occur in recirculating systems over 12 days of observation. However, in flow-through systems, the extent and rate of fouling depended on the solution Fe concentration. Furthermore, addition of phosphorus increased the fouling rate. Bulk precipitation appeared to be significant at iron(III) dosing over 3 mg/L. Theoretical predictions of an equilibrium model (MINEQL+) showed similar trends with measured concentrations of soluble Fe and P from batch tests. However, model predictions of temperature effects alone could not account for the observed solids deposition on the quartz sleeve. Bulk precipitation, followed by sedimentation, was considered to be the dominant mechanism at high iron (III) concentrations.
机译:铁(III)(主要添加为FeCl3)是在废水消毒过程中与紫外线灯结垢有关的主要无机成分之一。在实验室条件下运行低压汞灯紫外线系统,以评估热量和紫外线对结垢的影响。铁(III)的剂量不同,并且通过测量紫外线辐射来监测结垢。还研究了磷酸铁结垢的可能性和有机物的影响。结果表明,在12天的观察中,再循环系统未发生结垢。但是,在流通系统中,结垢的程度和速度取决于溶液中铁的浓度。此外,添加磷提高了结垢率。铁(III)剂量超过3 mg / L时,大量沉淀似乎很明显。平衡模型(MINEQL +)的理论预测表明,批次测试中可测出的可溶性Fe和P浓度具有相似的趋势。但是,仅凭温度影响的模型预测不能解释观察到的固体在石英套管上的沉积。在高铁(III)浓度下,大量沉淀然后沉淀是主要的机理。

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    Gehr, G.; Sheriff, M.;

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  • 年度 2006
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  • 原文格式 PDF
  • 正文语种 eng
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