Water Use and Effluent Treatment in Canadian High Yield Pulp Mills, 2008 Engineering, Pulping and Environmental Conference

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In Canada, there are currently nine mills producing market high yield pulps (HYP), mainly BCTMP from hardwoods and spruce. Together their annual production is around 2.2 million tonnes. The water usage is typically low, or in the case of two mills, zero effluent. For the mills which discharge effluent, the effluent properties represent a challenge for biotreatment, particularly the high concentrations of extractives and chemical oxygen demand. These challenges have been met in a number of ways including activated sludge treatment, anaerobic treatment, and more recently biofilm activated sludge. The effluent properties and biotreatment technologies will be reviewed in this presentation.