{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,29]],"date-time":"2026-07-29T06:54:05Z","timestamp":1785308045586,"version":"3.55.0"},"reference-count":35,"publisher":"Wiley","issue":"12","license":[{"start":{"date-parts":[[2006,11,1]],"date-time":"2006-11-01T00:00:00Z","timestamp":1162339200000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Water Environment Research"],"published-print":{"date-parts":[[2006,11]]},"abstract":"<jats:p>The fouling of quartz sleeves surrounding UV disinfection lamps is a perennial problem affecting both drinking water and wastewater applications. The mechanisms of fouling are not fully understood, but factors promoting fouling are believed to include heat, high hardness and\/or high iron concentrations, and hydrodynamic forces. The role of UV radiation itself is unclear. The goal of this paper is to attempt to isolate the fouling mechanisms and to provide key information about those induced by UV radiation, using a unique laboratory\u2010scale continuous\u2010flow UV reactor. Its design allowed for irradiated and nonirradiated zones and control of both temperature and UV intensity at the fouling surface. Synthetic wastewater samples were tested with two levels of calcium, iron, phosphorus, and biochemical oxygen demand (as beef broth), and constant levels of magnesium and nitrogen to assess the effects of the four key variables. Average UV fluence before fouling exceeded 35 mJ\/cm<jats:sup>2<\/jats:sup>, based on collimated beam tests. Foulant accumulation was monitored by UV intensity measurements and by mass and composition of foulant collected after an average of 56 hours of continuous operation. Tests showed that relative UV intensity dropped by as much as 100% when iron was present. Detailed results were assessed and yielded support for the following three UV\u2010induced fouling mechanisms: (a) precipitation of ferric hydroxide [Fe(OH)<jats:sub>3<\/jats:sub>], (b) release of calcium from calcium\u2010organics complexes followed by precipitation of iron\u2010organics complexes, and (c) calcium carbonate precipitation. Other fouling mechanisms, such as sedimentation of preformed particles and sorption of calcium onto preformed colloids of Fe(OH)<jats:sub>3<\/jats:sub>, occurred outside the zone of UV radiation. Hence, these could be confused with concurrent UV\u2010induced mechanisms in full\u2010scale reactors. Iron and\/or calcium undoubtedly created the most favorable conditions for fouling to occur; in the absence of both, fouling would be unlikely. The rates of fouling were enhanced when organics were also present; however, when phosphorus was present, fouling in the UV section was reduced. Indeed, UV may be viewed as inhibiting the fouling caused by phosphate complexes.<\/jats:p>","DOI":"10.2175\/106143006x95474","type":"journal-article","created":{"date-parts":[[2006,11,20]],"date-time":"2006-11-20T19:16:32Z","timestamp":1164050192000},"page":"2311-2323","source":"Crossref","is-referenced-by-count":20,"title":["Fouling Mechanisms in a Laboratory\u2010Scale UV Disinfection System"],"prefix":"10.1002","volume":"78","author":[{"given":"Yoel","family":"Nessim","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ronald","family":"Gehr","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2006,11]]},"reference":[{"key":"e_1_2_7_2_1","volume-title":"User's Guide, The Rothberg, Tamburini & Winsor Model for Corrosion Control and Process Chemistry","author":"American Water Works Association","year":"1996"},{"key":"e_1_2_7_3_1","volume-title":"Standard Methods for the Examination of Water and Wastewater","author":"American Public Health Association; American Water Works Association; Water Environment Federation","year":"1998"},{"key":"e_1_2_7_4_1","volume-title":"Process Chemistry for Water and Wastewater Treatment","author":"Benefield L. 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