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Pulp and Papermill Industry Benchmarks There are tons of files containing information on every subject from A to Z on the internet with standards, benchmarks and industry BMP's. The problems is, who has time to dig and find it all. It is not always in easy to find places. We have tried to show you some of the ones we though might be useful. There are links to the places where we found some of them in case you want to dig deeper on a particular subject and find out more.
Approximately 26% of the bleached kraft and soda mills in the United States have essentially complete spent pulping liquor management and control systems, approximately 29% have partial systems, and approximately 45% would require major upgrades to fully implement effective control systems. Sulfite mills in the United States are estimated to have a status similar to the bleached kraft mills.
Black Liquor can be a big problem at wastewater treatment plants at papermills. The chemical components are of particular interest due to the fact that a spill can have an adverse impact on the biomass in the system. If the spill is large enough and passes through the system, the impact on the receiving water and the aquatic life present might also be of concern, not to mention any emissions of TRS and HAP's to the air that black liquor also might contain. Below is a chart that shows some of the components that might be found in black liquor. Usually black liquor is not toxic to the bacteria in a system though. A spill usually means tons of high food loading, white foaming may be seen on the lagoons or aeration basins, but high BOD or TSS can be present in the effluent if the system is not properly adjusted to handle the spill. On the other hand, Green liquor or white liquor spills can be toxic to a system in some cases.
Did you know that a 1% fiber capture recovery yields ~$1MM in profits ?
Since toxicity can be an issue at Pulp and papermills here are some chemicals and the impact they have on Daphnia and Fathead minnows. Below are some typical removal rates for some common pollutants found in paper mills. BOD and TSS are almost always critical in a final permit effluent, unless the receiving water is a P.O.T.W. Typically the final effluent rates might be higher, but in those cases the surcharges also are higher.
What does a paper mill use? Below are some of the materials used and some of the wastes that might be generated
Sample Benchmarks for the Pulp and Papermill Industry: The forest products industry generates 51% of its energy needs from biomass and black liquor Boiler fuel and machine drives represent the largest energy end use in pulp and paper and lumber and wood, respectively The pulp and paper industry uses 84% of the energy consumed by the forest products industry Solid Waste generation- .01-.26 tons per ton of product (TPT) Landfill cost-10-20 million Knots- reuse them or waste Wood yard waste - .02-.06 TPT Sludge from a de-inking process has only 50% of the energy of bark Typical Sludge generation- .02-.06 TPT Ash generation: .04 TPT Lime mud is limited by kiln production –up to 200 tons per day Process waste- Averages 16-17,000 PTP
Stormwater may contain dust, bark and wood debris that contribute to TSS problems in the wastewater treatment systems if entering at the back of lagoons or ponds Boiler Ash-
Forest products account for about 11% of all manufacturing energy costs The forest products industry is the largest cogenerator in the manufacturing sector Energy intensity has declined since 1972 More on Papermills: Troubleshooting Lagoon Systems Wastewater in the Fall- Problems and Solutions Hurricane or Severe Weather Upset recovery program Wild Weather Extremes that can impact your plant Take a tour of a papermill Solids Holding in a papermill Lagoons-Winter BOD issues and bioaugmentation Learn how Environmental Leverage can help your plant Bioaugmentation in Papermills- impact on BOD and TSS Filamentous bacteria can be a problem is solids are held too long in a clarifier also. Total System Optimization- Case History More to come . . . . .
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