ABSTRACT
Lake Utopia Paper Limited operates a 300 ton/d corrugating medium mill at St. George, New Brunswick. The L'Etang Estuary is the receiving water for mill effluent. Waters from the L'Etang Estuary flow into the Bay of Fundy. Anaerobic pilot plant studies on pulp and paper effluents carried out by Environment Canada's Wastewater Technology Centre indicated that the wastewater could be treated by anaerobic methods. Also, an on-site demonstration program carried out by MacMillan Bloedel Ltd. at Sturgeon Falls, Ontario, using anaerobic technology confirmed the findings by Environment Canada. Chemicals used at the mill consist of NaOH and molten sulphur for pulping, felt washing compounds, oil for machinery operation, and biocides for reduction of slime growth. These chemicals are stored in various locations throughout the mill. Discharges of these chemicals are to the paper mill sewer. Pilot Plant demonstrates the ability to produce granular sludge and biologically active as verified by sludge activity tests.
