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Manufacturing Technology Insights | Monday, December 04, 2023
The pulp and paper industry is one of the world's worst contaminants and a massive consumer of water. However, efforts are being made to become more environmentally friendly.
FREMONT, CA: The pulp and paper industry is one of the world's worst contaminants and water consumers. However, due to tighter performance standards and increased regulation, stakeholders have begun to green their mill operations.
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Let's examine three main strategies employed by the pulp and paper industry:
Improve water usage: The pulp and paper industry uses more water per ton of product than any other industry, from the water-intensive pulping process to the water-intensive bleaching procedure. While the average water consumption per ton has decreased by 47 percent since the 1990s, one kilogram of paper can require up to 100 liters (26 gallons) of water.
It is estimated that 85 percent of the water used to produce cellulose and paper is processed water. Enhanced filtration and distillation procedures have allowed contaminated effluent to be safely discharged or recirculated for alternative uses due to growing pressure to reduce water footprints and boost efficiency.
The evaporators that consume biomass-based black liquor require hundreds of gallons of water to clean.
Reduce carbon monoxide: During the production of one kilogram of paper, approximately one kilogram of carbon dioxide is emitted; this number rises to 1.2 kilograms if the paper is not recycled. As a major carbon emitter, the pulp and paper industry is positioned to contribute significantly to realizing a net-zero economy. Innovations are currently being developed to do so.
A Finnish study conducted in 2022 concluded that many mills already have the potential to function as carbon sinks, with a CO2 capture rate of less than 6 percent sufficient to make all market kraft pulp mills studied carbon-negative. It has been demonstrated that biogenic carbon emissions captured from factories and combined with hydrogen can produce enough synthetic fuel to power an entire nation.
Enhance energy efficiency: Regarding profit and environmental impact, production efficacy is essential to success in the pulp and paper industry. Steam use efficiency can be enhanced through heat recovery in boilers and the drying process, two energy-intensive processes.
The International Energy Agency notes that cultivating additional renewable energy sources, bioenergy, and alternative fuels will be essential for the pulp and paper industry to achieve its 2050 goals. In addition, the use of Combined Heat and Power (CHP) has the potential to substantially improve the industry's energy efficiency.
Fouling and scaling in apparatus and pipes is a significant factor that frequently contributes to diminished production efficiency and inferior product quality.
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