How Paper Mills Utilize Biogas Generated from Wastewater Treatment

During the wastewater treatment process at paper mills, the anaerobic treatment stage generates significant quantities of biogas. Wastewater contains high levels of dissolved organic matter, which is converted into biogas through anaerobic treatment. As a high-energy gas, this biogas offers substantial potential for energy recovery. There are four primary methods for utilizing biogas: generating electricity via gas holders, producing steam in biogas-fired boilers, upgrading the biogas for injection into municipal natural gas grids or for use at vehicle refueling stations, and converting it into carbon dioxide through controlled combustion. The choice of utilization method depends on factors such as the volume of biogas produced, local energy prices, and environmental regulatory requirements.

For paper mills with high wastewater discharge volumes and stable biogas production, biogas-based power generation serves as an effective pathway toward energy self-sufficiency and reduced operating costs. Direct combustion of biogas in boilers to generate steam is well-suited for paper mills that have a significant internal demand for steam—provided that their biogas output aligns closely with their steam consumption requirements. Alternatively, upgrading biogas for injection into municipal gas grids or for use in vehicle refueling stations is better suited for large-scale paper mills—or centralized wastewater treatment facilities serving paper industrial parks—that feature high wastewater volumes, elevated organic concentrations, and substantial biogas yields. Finally, flaring biogas—converting it into carbon dioxide—can satisfy environmental compliance requirements while preventing the direct release of methane into the atmosphere.

If you are planning a biogas utilization project for wastewater treatment at a paper mill, please contact Leizhan. Based on factors such as your wastewater treatment scale (e.g., daily discharge volume), biogas yield, local electricity and natural gas prices, steam requirements, and environmental regulations, Leizhan can help evaluate the feasibility and economic viability of your proposed solution, while also providing the necessary equipment and engineering services. Email: leizhanpapermachine@gmail.com