Insights into leachate reduction in landfill with different ventilation Rates: Balance of Water, waste physicochemical Properties, and microbial community

TY - JOUR

T1 - Insights into leachate reduction in landfill with different ventilation Rates

T2 - Balance of Water, waste physicochemical Properties, and microbial community

AU - Jin, Pan

AU - Bian, Shijie

AU - Yu, Wenbo

AU - Guo, Shuai

AU - Lai, Changfei

AU - Wu, Lixin

AU - Zhao, Hongyang

AU - Xiao, Keke

AU - Liang, Sha

AU - Yuan, Shushan

AU - Huang, Liang

AU - Wang, Songlin

AU - Duan, Huabo

AU - Gan, Fangmao

AU - Chen, Wenran

AU - Yang, Jiakuan

N1 - Publisher Copyright: © 2022 Elsevier Ltd

PY - 2023/2/1

Y1 - 2023/2/1

N2 - Ventilation is an efficient approach employed for accelerating stabilization and reducing aftercare of landfill, but its effect on leachate reduction is still elusive. To fill this knowledge gap, five lab-scale landfill reactors with different ventilation rates were established in this study. Suitable ventilation (e.g. 0.25–0.5 L·min−1·kg−1 dry solid of waste (DS)) was beneficial to promoting the stabilization of landfill, which effectively accelerated the degradation of organic matter and reduced water content of landfilled waste. Based on the mass balance of water, the dominant input water was initial water of landfilled waste (more than 94 %), which was partially converted to leachate and evaporated water. Ventilation enhanced the intensity of biochemical reactions heat to increase evaporated water content from 0 to 0.29 t/t DS while reducing the leachate generation significantly from 0.69 to 0.49 t/t DS with the increase of ventilation rate. Besides, the hydrophilic substances, such as humic acid-like substances, in landfilled waste increased, and the surface of the landfilled waste converted from smooth to rough. The reduction of the bound water content has a significant correlation with the degradation of organic matter content (p less than 0.05), which reduced the water-holding capacity of waste. Actinobacteriota and Firmicutes were the key bacterial phyla in the degradation of organic matter to promote bio-heat and evaporation of water, thus reducing leachate production under suitable ventilation conditions. Carbohydrates and amino acids were the main energy metabolism sources of bacteria during the landfill process. This study deepens our understanding of the leachate reduction mechanism in the micro-aerobic landfill.

AB - Ventilation is an efficient approach employed for accelerating stabilization and reducing aftercare of landfill, but its effect on leachate reduction is still elusive. To fill this knowledge gap, five lab-scale landfill reactors with different ventilation rates were established in this study. Suitable ventilation (e.g. 0.25–0.5 L·min−1·kg−1 dry solid of waste (DS)) was beneficial to promoting the stabilization of landfill, which effectively accelerated the degradation of organic matter and reduced water content of landfilled waste. Based on the mass balance of water, the dominant input water was initial water of landfilled waste (more than 94 %), which was partially converted to leachate and evaporated water. Ventilation enhanced the intensity of biochemical reactions heat to increase evaporated water content from 0 to 0.29 t/t DS while reducing the leachate generation significantly from 0.69 to 0.49 t/t DS with the increase of ventilation rate. Besides, the hydrophilic substances, such as humic acid-like substances, in landfilled waste increased, and the surface of the landfilled waste converted from smooth to rough. The reduction of the bound water content has a significant correlation with the degradation of organic matter content (p less than 0.05), which reduced the water-holding capacity of waste. Actinobacteriota and Firmicutes were the key bacterial phyla in the degradation of organic matter to promote bio-heat and evaporation of water, thus reducing leachate production under suitable ventilation conditions. Carbohydrates and amino acids were the main energy metabolism sources of bacteria during the landfill process. This study deepens our understanding of the leachate reduction mechanism in the micro-aerobic landfill.

KW - Landfill

KW - Leachate reduction

KW - Microbial analysis

KW - Ventilation

KW - Water balance

UR - http://www.scopus.com/inward/record.url?scp=85144590116&partnerID=8YFLogxK

U2 - 10.1016/j.wasman.2022.11.033

DO - 10.1016/j.wasman.2022.11.033

M3 - 文章

C2 - 36462342

AN - SCOPUS:85144590116

SN - 0956-053X

VL - 156

SP - 118

EP - 129

JO - Waste Management

JF - Waste Management

ER -