报道了254nm低压汞蒸气紫外线（UV）照射对两个地表水和两个地下水源生物再生潜力的影响。由于即将出台的地下水规则可能会产生影响，目前正在研究紫外线消毒作为氯化的替代方法。将待测水样分离为亲水性和疏水性部分。在剂量为130 mW的紫外线处理前后采集的非分馏和分馏水样中，测量了可生物降解溶解有机碳（BDOC）的浓度。s/cm2。在这些分析中比较了两种方法:30天的BDOC试验和5天的可同化有机碳（AOC）试验。许多配对t检验显示（95%的置信水平）没有证据表明紫外线处理增加了BDOC或AOC。由于不同来源的水的结果不同，考虑紫外线处理的公用事业公司应评估其自身配水系统中生物再生的可能性。 包括23个参考文献、表格和图表。

The effects of low-pressure mercury-vapor ultraviolet (UV) irradiation at 254 nm on the biological regrowth potential of two surface water and two groundwater sources are reported. Because of possible effects of the pending Ground Water Rule, UV disinfection is being studied as an alternative to chlorination. Water samples to be tested were separated into hydrophilic and hydrophobic fractions. The concentration of biodegradable dissolved organic carbon (BDOC) was measured in nonfractionated and fractionated water samples collected before and after UV treatment at a dosage of 130 mW.s/cm2. Two methods were compared in these analyses: a 30-day BDOC and a 5-day assimilable organic carbon (AOC) test. Many paired t-tests showed (at a 95 percent confidence level) no evidence that UV treatment increased BDOC or AOC. Because results differed in water from different sources, utilities considering UV treatment should evaluate the potential for biological regrowth in their own distribution systems. Includes 23 references, tables, figures.