Residuals can be beneficially used to promote plant establishment and growth; improve soil quality, development and structure; reduce erosion; treat leachate; and as an energy source.
Pulp and Paper Residuals
SYLVIS’s understanding of the production and characteristics of pulp and paper residuals allows us to recommend and implement beneficial use opportunities.
The mechanical or chemical pulping of wood and the processing of recycled paper generates a wastewater effluent stream requiring treatment. Primary treatment of the raw effluent typically involves the physical separation of wood fibres and other components. Secondary treatment is typically a biological process in which nutrients (nitrogen and phosphorus) are added and organisms accelerate the removal of suspended solids. The solids recovered from the primary and secondary processes are collectively referred to as pulp and paper residuals. Depending on the process, pulp and paper residuals can also include lime mud, ash and short paper fibre.
There are a number of beneficial use opportunities for pulp and paper residuals including:
- land application as a fertilizer and/or soil amendment;
- use as a barrier layer in landfill closure; and
- as feedstock for fabricated soil for use in mine reclamation, leachate treatment and as a substitute for topsoil in landfill closure.
The physical and chemical characteristics of pulp and paper residuals make them ideal soil amendments in fertilization and reclamation.