Biotechnology of Processes for Environment, Faculty of Engineering, Universidad de la República, Montevideo, Uruguay.
Waste Manag Res. 2023 Aug;41(8):1331-1341. doi: 10.1177/0734242X231154198. Epub 2023 Mar 13.
The current disposal of biosludge generated in wastewater treatment has high costs and causes environmental problems, anaerobic digestion (AD) of solid waste is a promising alternative. Thermal hydrolysis (TH) is an accepted technology to enhance anaerobic biodegradability of sewage sludge, but this technology has not been developed to be used with biological sludge from industrial wastewater treatment. In this work, the improvements to the AD of biological sludge from cellulose industry when thermal pretreatment is carried out were experimentally determined. The experimental conditions for TH were 140 °C and 165 °C for 45 minutes. Batch tests were carried out to quantify methane production evaluated as biomethane potential (BMP), anaerobic biodegradability according to volatile solids (VS) consumption and kinetic adjustments. An innovative kinetic model based on the serial mechanism of fast and slow biodegradation fractions was tested for untreated waste, and parallel mechanism was also evaluated. Increases in BMP and biodegradability values according to VS consumption were determined with increasing TH temperature. The results of 241 NmL CH gVS substrate for BMP and 65% biodegradability are reported for the 165 °C treatment. AD rate increased for the TH waste compared to the untreated biosludge. Improvements of up to 159% for BMP and 260% for biodegradability according to VS consumption were quantified for TH biosludge compared to untreated biosludge.
当前，污水处理厂产生的生物污泥的处理费用很高，且会造成环境问题，而固体废物的厌氧消化（AD）则是一种很有前途的替代方法。热水解（TH）是一种公认的增强污水污泥厌氧生物降解性的技术，但该技术尚未开发用于处理工业废水处理厂的生物污泥。在这项工作中，通过实验确定了对纤维素工业生物污泥进行热预处理时对 AD 的改进。TH 的实验条件为 140°C 和 165°C 各 45 分钟。进行了批量测试以量化甲烷产量，评估为生物甲烷潜力（BMP），根据挥发性固体（VS）消耗和动力学调整评估厌氧生物降解性。针对未处理的废物测试了基于快速和慢速生物降解分数的串联机制的创新动力学模型，并评估了平行机制。随着 TH 温度的升高，BMP 和根据 VS 消耗确定的生物降解性值增加。对于 165°C 处理，报告了 BMP 为 241NmL CH gVS 基质和 65%生物降解性的结果。与未处理的生物污泥相比，TH 废物的 AD 速率增加。与未处理的生物污泥相比，TH 生物污泥的 BMP 提高了 159%，根据 VS 消耗的生物降解性提高了 260%。
