CRYSTAL LAKE – Slightly abnormal odors might come from the city’s Wastewater Treatment Plant No. 2 as workers fire up a new anaerobic digester. The new digester that was installed at the 1100 Coventry Lane plant will become operational Tuesday. Odors might be intermittently present for the next week or two, according to a memo from the city’s Public Works Department. The plant is adjacent to a residential area, St.