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High‐Performance, Low‐Cost Solar Collectors for Disinfection of Contaminated Water
Author(s) -
Vidal A.,
Díaz A.I.
Publication year - 2000
Publication title -
water environment research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.356
H-Index - 73
eISSN - 1554-7531
pISSN - 1061-4303
DOI - 10.2175/106143000x137473
Subject(s) - water disinfection , environmental science , sunlight , solar energy , environmental engineering , contamination , water treatment , waste management , engineering , physics , electrical engineering , ecology , astronomy , biology
Although the germicidal action of sunlight has long been recognized, its potential for practical applications has to be researched more thoroughly. This paper summarizes the progress made toward a commercially practical collector for solar disinfection applications. Nontracking compound parabolic collectors (CPCs), developed originally for capturing solar photons for thermal energy applications, were examined as potential solar photoreactors. A field demonstration of solar disinfection treatment using commercially manufactured solar reactors was conducted. Field tests showed successful destruction of Escherichia coli and Enterococcus faecalis and have provided data for full‐scale design of water treatment systems. From above observations, a throughput value of 50 L/m 2 h for the low‐cost CPC reactor tested was estimated. For a 190 m 3 /d (0.05 MGD) facility, the estimated total costs for disinfection using UV‐A is U.S. .19/m 3 (.70/1000 gal). The use of near‐UV sunlight to disinfect water supplies seems promising in rural communities of developing countries where treated water is unavailable.