Abstract：
Proper management of wastewater treatment plant side streams in pulp and paper mills is a matter of great interest. This study evaluates the environmental impact of different strategies in the management of biosludge from pulp and paper mills in Finland through a Life Cycle Assessment methodology. The base industrial standard practice, biosludge incineration for energy recovery and ash landfill disposal (Scenario 1), was compared to the alternative process of hydrothermal carbonization. The hydrochar generated from hydrothermal carbonization was evaluated for energy recovery through incineration (Scenario 2), or for use in composting for nutrient recovery (Scenario 3). The results showed that the hydrothermal process improved the overall environmental performance of the sludge management, particularly in terms of energy consumption and greenhouse gas emissions. The use of hydrochar as a soil amendment in composting also resulted in a significant reduction on the environmental impact compared to the other two scenarios. Overall, this study highlights the potential of hydrothermal carbonization and hydrochar utilization as sustainable options for managing biosludge from pulp mills.
摘要：
纸浆和造纸厂中废水处理厂侧流的适当管理是非常令人感兴趣的问题。本研究通过生命周期评估方法评估了芬兰制浆和造纸厂生物污泥管理中不同策略的环境影响。基础工业标准实践，用于能量回收和灰烬填埋处理的生物污泥焚烧(场景1)，与水热碳化的替代工艺进行了比较。水热碳化产生的水热炭通过焚烧进行能量回收评估（方案2），或用于堆肥以恢复养分（方案3）。结果表明,水热法提高了污泥管理的整体环境性能,特别是在能源消耗和温室气体排放方面。与其他两种情况相比，在堆肥中使用水炭作为土壤改良剂也大大减少了对环境的影响。总的来说,这项研究强调了水热碳化和水炭利用作为管理来自纸浆厂的生物污泥的可持续选择的潜力。
