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Long‐Term Destratification in an Illinois Lake
Author(s) -
Raman Raman K.,
Arbuckle Benny R.
Publication year - 1989
Publication title -
journal ‐ american water works association
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.466
H-Index - 74
eISSN - 1551-8833
pISSN - 0003-150X
DOI - 10.1002/j.1551-8833.1989.tb03218.x
Subject(s) - environmental science , aeration , water quality , algae , groundwater , water supply , environmental engineering , manganese , sulfate , hydrology (agriculture) , ecology , waste management , chemistry , geology , engineering , biology , geotechnical engineering , organic chemistry
Lake Eureka was created in 1942 to serve as a water supply source for Eureka, Ill., but because of persistent complaints about tastes and odors, in 1979 the city abandoned the lake and switched to groundwater. A low‐energy mechanical destratifier installed in the deepest part of the lake and chelated copper sulfate application to control blue‐green algae were first used in 1981 to improve water quality. The aerator has destratified the lake and maintained adequate oxygen levels. Iron and manganese concentrations in deep water have been reduced by 95 to 97 percent from the predestratification levels. Chlorine demand values have been reduced by more than half, and problem‐causing blue‐green algae have been brought under control. The city reinstated the lake as its water supply source in April 1982 and has realized a 50 to 60 percent savings in annual plant operating costs over the past six years.