Department of Bioprocesses Engineering, Energetics and Automatization, Faculty of Production and Power Engineering, University of Agriculture in Krakow, Balicka Street 116b, 30-149 Krakow, Poland.
Department of Bioprocesses Engineering, Energetics and Automatization, Faculty of Production and Power Engineering, University of Agriculture in Krakow, Balicka Street 116b, 30-149 Krakow, Poland.
Sci Total Environ. 2021 May 20;770:145375. doi: 10.1016/j.scitotenv.2021.145375. Epub 2021 Jan 23.
Biostabilization is a commonly applied method in mechanical-biological treatment (MBT) plants to process municipal solid waste. In many ways, e.g. by applying additives to waste, MBT plant operators strive to enhance the effectiveness of biostabilization, which leads to reducing the time and energy outlays necessary for the process, as well as to minimizing the amount of final stabilized waste directed to landfills. This paper deals with the impact of digestate waste from agricultural biogas plants used as additive to the biostabilization process of undersized fraction from municipal solid waste (UFMSW) on the intensive phase of the process and properties of stabilized waste. The aim of this study was to assess whether, and if so to what extent, the application of digestate waste affects the process. Five different input compositions were tested (without digestate and with the addition of digestate at: 2.5; 5; 7.5 and 10 wt%). Waste treatment time was 2 weeks. Changes in moisture content, organic matter (OM), respiration activity (AT4), bulk density, air-filled porosity, heavy metal content, pH, carbon to nitrogen ratio, as well as composition of process gases emitted were evaluated. Additionally, microorganisms (including pathogens) inhabiting the processed waste in the aspect of waste sanitation were analyzed. It was found that the addition of digestate at 2.5, 5 and 7.5 wt% extended the duration of the thermophilic phase and decreased the CO content in process gases. The addition of digestate at 2.5 wt% and 5 wt%, decreased also OM by approx. 25% of the initial value and AT4 by approx. 30%. It was also proved that the addition of digestate favors the limited sanitation of UFMSW. As a result of the research, it was found that the addition of digestate at 2.5 wt% and 5 wt% is sufficient to accelerate the aerobic biological degradation of UFMSW.
生物稳定化是机械-生物处理（MBT）工厂处理城市固体废物的常用方法。在许多方面，例如通过向废物中添加添加剂，MBT 工厂操作人员努力提高生物稳定化的效果，这导致减少处理过程所需的时间和能源支出，并最大限度地减少最终稳定化废物送往垃圾填埋场的数量。本文研究了农业沼气厂的消化废物作为城市固体废物（UFMSW）的小粒径部分生物稳定化过程的添加剂对过程强化阶段和稳定化废物特性的影响。本研究的目的是评估是否以及在何种程度上应用消化废物会影响该过程。测试了五种不同的输入成分（不添加消化废物和添加消化废物的比例为：2.5%、5%、7.5%和 10%）。废物处理时间为 2 周。评估了水分含量、有机物（OM）、呼吸活性（AT4）、堆积密度、充气孔隙率、重金属含量、pH 值、碳氮比以及排放的过程气体组成的变化。此外，还分析了处理废物中微生物（包括病原体）的状况，以评估废物卫生情况。结果表明，添加 2.5%、5%和 7.5%wt%的消化废物延长了高温阶段的持续时间，并降低了过程气体中的 CO 含量。添加 2.5%wt%和 5%wt%的消化废物也降低了约 25%的初始 OM 和约 30%的 AT4。还证明了添加消化废物有利于 UFMSW 的有限卫生。研究结果发现，添加 2.5%wt%和 5%wt%的消化废物足以加速 UFMSW 的好氧生物降解。
