... biomass-based waste and byproduct fuels (e.g., wood, spent pulping liquors, chips, sawdust, bark). Despite its large use of biomass-based fuels, the paper manufacturing industry is the fourth ... Process Process Air Emissions Process Effluents Wastes, Residuals, or Byproducts Papermaking Possible formaldehyde emissions from urea or melamine formaldehyde resins used for wet strength; ... the U. S. Pulp and Paper Industry 19 Table 2-5 . Summary of Environmental Aspects of Pulping Processes Process Air Emissions Process Effluents Wastes, Residuals, or Byproducts Chemical Pulping...