Posted 06/04/07 About 30 years ago, unnatural and excessive biological growth started occurring in the small, man-made Beseck Lake six miles southeast of Wesleyan's campus. Septic systems from lakeside homes deposited nutrients into the water, altering the biogeological cycles of carbon, sulfur, nitrogen and phosphorus in the aquatic ecosystem. By 2002, the problem was remedied by connecting the homes to a city sewer system and the quality of the lake water improved. However, excess algae growth continued to form, proving that some unwanted nutrients continued to exist. What was still polluting the lake? asked Tim Ku, assistant professor of earth…