Richter A Y, Weaver R W
Texas A&M University, MS 2474, College Station, TX 77843, USA.
Environ Technol. 2003 Sep;24(9):1175-82. doi: 10.1080/09593330309385658.
Subsurface flow constructed wetlands are becoming increasingly common for on-site treatment of domestic wastewater. Before spray application, wetland effluent must be disinfected. Traditionally, tablet chlorination has been used, but an alternative is needed to increase dependability. Consequently, we investigated the use of ultraviolet light disinfection of effluent from constructed wetlands. Two low pressure (254 nm) and two medium pressure ultraviolet bulbs (190 to 400 nm) were used for disinfection. Upon installation, all units disinfected effluent successfully. After 2 weeks in operation, three of the four units did not reduce fecal coliform populations below 200 in 100 ml of effluent due to decreased light intensity from films that developed on the bulbs. One unit consistently disinfected water to populations lower than 200 in 100 ml for 1 year without maintenance. Ultraviolet disinfection, as utilized, was not consistently suitable for disinfection of effluent from subsurface flow constructed wetlands because of coatings that developed on the bulbs and blocked the light.
潜流人工湿地越来越常用于生活污水的现场处理。在进行喷洒应用之前，湿地出水必须进行消毒。传统上，一直采用片剂氯化消毒法，但需要一种替代方法来提高可靠性。因此，我们研究了利用紫外线对人工湿地出水进行消毒。使用了两个低压（254纳米）和两个中压紫外线灯（190至400纳米）进行消毒。安装后，所有装置都成功地对出水进行了消毒。运行2周后，由于灯泡上形成的薄膜导致光强度降低，四个装置中的三个未能将100毫升出水中的粪大肠菌群数量降至200以下。一个装置在无需维护的情况下，持续一年将水中的粪大肠菌群数量消毒至100毫升低于200。由于灯泡上形成涂层并阻挡了光线，所采用的紫外线消毒并不始终适用于潜流人工湿地出水的消毒。
