Effect of air and water on the release of chlorine from semi-aerobic landfill. Issue 14 (20th June 2022)

• Record Type: Journal Article
• Authors: Liu, Dongyun; Xu, Jing; Fang, Yuan; Du, Yao; Hu, Lifang; Fang, Chengran; Shen, Dongsheng; Long, Yuyang
• Is Part Of: Environmental technology. Volume 43:Issue 14(2022)
• Page Start: 2197
• Page End: 2206
• Publication Date: 2022-06-20
• Subjects: Chloride -- landfill -- leachate -- migration behaviour; Environmental engineering -- Periodicals; Environmental protection -- Periodicals; 628.05
• DOI: 10.1080/09593330.2020.1869838
• Languages: English
• ISSNs: 0959-3330

Abstract

ABSTRACT: Landfill leachate has a high chloride (Cl − ) content. Because it is highly mobile, and cannot be sorbed or transformed bio-chemically, it is important to have detailed information about how it migrates in landfill sites. In this study, we set up four lab-scale simulated landfills, including an anaerobic landfill (AL), an anaerobic landfill with leachate recirculation (RAL), an anaerobic/semi-anaerobic landfill with leachate recirculation (RASL), and an anaerobic/semi-aerobic landfill (ASL), to explore how, when regulated, moisture and air affected the migration of chlorine. We found that water and air had a strong influence on the release of Cl − . Leachate obviously promoted Cl − dissolution in refuse when recirculated. When air was introduced into landfill, thereby changing it from anaerobic to semi-aerobic, the leachate Cl − concentration increased sharply from around 4–9 g L −1 (RASL) and 18 g L −1 (ASL), respectively. In principle, Cl − is released continuously when leachate is recirculated in landfills (RAL and RASL), but it can also be found a terminal when the leachate recirculation stops (AL and ASL). Cumulative amounts of 64, 66, 27, and 53 g of Cl − were released from the AL, RAL, RASL, and ASL, respectively. Lower COD/Cl and N H 4 + -N/Cl ratios in ASL and RASL after day 175 indicated that lower Cl − pollution risk than that in AL and RAL. GRAPHICAL ABSTRACT: UF0001