利用实验室准直光束装置研究了膜处理废水的紫外线消毒能力。二级澄清废水经过氯化处理以减少膜污染，或未经氯化处理，在奥兰治县水区的水厂21设施中通过微滤（MF）和反渗透（RO）进行处理。膜处理后的废水具有较低的细菌密度、悬浮物和浊度，以及较高的紫外线透射率。与常规处理的废水相比，这些特性允许较低的紫外线剂量实现相同的失活反应。使用0至150 mWs/cm2的紫外线剂量，研究了大肠杆菌MS2种子MF滤液和RO渗透液以100:0、60:40、20:80和0:100的比例混合，未经洗涤和氯化。将MS2大肠噬菌体接种到5x10[6]pfu/mL的靶点，并使用噬菌体生物测定的顶部覆盖琼脂法进行计数。准直光束单元（PCI-WEDECO）采用低功率- 压力汞蒸气灯作为紫外线光源，使用辐射计直接测量254 nm处的紫外线强度。包括4个参考文献。

The ultraviolet disinfectability of membrane treated wastewater was investigated using a laboratory collimated beam apparatus. Secondary clarified effluent, chlorinated to reduce membrane fouling, or unchlorinated, is treated by microfiltration (MF) followed by reverse osmosis (RO) at Orange County Water District's Water Factory 21 facility. Membrane treated wastewater has low bacterial density, suspended solids and turbidity and high UV transmittance. These properties allow a lower UV dose to achieve the same inactivation response when compared to conventionally treated wastewater. Coliphage MS2-seeded MF filtrate and RO permeate blended in ratios of 100:0, 60:40, 20:80 and 0:100, unchloirinated and chlorinated were investigated using UV doses ranging from 0 to 150 mWs/cm2. MS2 coliphage was seeded to a target of 5x10[6] pfu/mL and enumerated using a top overlay agar method of bacteriophage bioassay. The collimated beam unit (PCI-WEDECO) employed low-pressure mercury vapor lamps as the UV light source with a radiometer for direct measurement of UV intensity at 254 nm. Includes 4 references.