Introduction of acid-neutralizing layer to facilitate the stabilization of municipal solid waste landfill

Hui Chen; Jian He; Dandan Zhou; Zhicheng Zhang; Jun Yao; Zhanhong Qiu; Dongsheng Shen

doi:10.1016/j.wasman.2022.10.013

Introduction of acid-neutralizing layer to facilitate the stabilization of municipal solid waste landfill

Waste Manag. 2022 Dec:154:245-251. doi: 10.1016/j.wasman.2022.10.013. Epub 2022 Oct 21.

Authors

Hui Chen¹, Jian He¹, Dandan Zhou¹, Zhicheng Zhang¹, Jun Yao², Zhanhong Qiu¹, Dongsheng Shen³

Affiliations

¹ Engineering Technology Center for Pollution Prevention and Control of Taizhou, Taizhou University, Jiaojiang 318000, Zhejiang province, China.
² Engineering Technology Center for Pollution Prevention and Control of Taizhou, Taizhou University, Jiaojiang 318000, Zhejiang province, China. Electronic address: yizaghi@126.com.
³ Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling, Zhejiang Gongshang University, Hangzhou 310018, China.

PMID: 36279592
DOI: 10.1016/j.wasman.2022.10.013

Abstract

Rapid stabilization is important for landfill operation and beneficial for treatment capacity recovery, biogas production, and pollution control. Acidification of municipal solid waste (MSW) landfill hinders the degradation of MSW. In this study, a leachate-recirculated landfill bioreactor with acid-neutralizing layer (reactor BL) and a control landfill bioreactor without the acid-neutralizing layer (CL) were operated for 509 days. The pH of the landfill was increased by the acid-neutralizing layer. The landfill gas production volume increased by 18.3 % in reactor BL compared with CL during the study period, and the CH₄ concentration was also increased. A greater MSW mass reduction was observed in reactor BL than in CL. Microbial community analysis demonstrated that the presence of the acid-neutralizing layer promoted the abundance of methanogens. Based on these observations, it is believed that application of the acid-neutralizing layer accelerated the stabilization by mitigating the acidification of landfill, which promote the abundance of methanogens and enhance the MSW degradation. These results help to understand the influencing mechanism of acid-neutralizing layer on the landfill stabilization, and provide a new approach for the practical landfill to achieve fast stabilization.

Keywords: Acid neutralizing layer; Landfill; Leachate recirculation; Methanogens; Stabilization.