LOGAN, Utah (AP) — Utah environmental regulators have set a seven-year deadline for Logan officials to cut the amount of phosphorus in sewage lagoons west of the city. Water from the lagoons discharges into Cutler Reservoir. Utah Department of Environmental Quality Assistant Director John Whitehead says phosphorous fuels algae blooms that produce oxygen during the day, but use oxygen at night and essentially suffocate fish and other animals. DEQ wants Logan to cut the amount of phosphorus in its sewage lagoons by half. To fix its phosphorous problem, Logan plans to partner with Utah State University researchers on a $40 million experimental project that would convert the algae into biofuels to power vehicles. The city hopes to fund the project through a federal grant.