Effect of Leachate Recirculation on Biological Stability of Municipal Solid Waste Under Simi-Arid Conditions

Abstract

A B S T R A C TThe present study was conducted to monitor the quality of leachate generated from solid waste landfills operated under different mode over a period of 335 days using a bench scale lysimeters. Sixty six kg waste sample reflecting the typical municipal solid waste (MSW) streams generated in Al-Diwaniyah city open dump was used to fill both sanitary and bioreactor lysimeters to study the influence of leachate recirculation on quality of leachate in landfills located in semi-arid areas. Leachate quality is frequently monitored in terms of pH, electrical conductivity (EC), chemical oxygen demand (COD), chloride, and total Kjeldahl nitrogen (TKN). The results show that pH and electrical conductivity values were clearly fluctuated in the rainy season, while in the dry season the values tend to decrease steadily with a close correlation between the chloride and electrical conductivity parameters. The study reveals that bioreactor landfill with leachate recirculation appears to be the most effective option in the removal of organic matter by 98% removal efficiency compared with 58% removal efficiency in a sanitary landfill. The main difference between recirculation and non-recirculation options is determined through leachate quality.

Evaluation The Leachate Characteristics and its Impacts on Groundwater Contamination Around Al-Diwaniyah Open Dumpsite

“…Abud et al focused on modifying leachate characteristics using a lime and sawdust waste mixture that assisted in enhanced solid waste stabilization [8]. In their research to examine the impact of leachate recirculation on the biological stability of MSW, Hussain, and Al-Ameen found that bioreactor landfills with leachate recirculation are superior to sanitary landfills at removing organic matter [9]. The amount of leachate and chemical composition, as well as the distance of the pollutant from the source of water, will affect the pollution level [10].…”

Evaluation of Leachate Recirculation Effect on the Acceleration of Waste Mineralization Process by Using a Coupled Numerical Model

“…Complex physical, chemical, and biological processes occur within landfills. Leachate with a substantial amount of pollutants and landfill gas are continually generated in landfills for a very long time [12,13]. e treatment of leachate remains an important environmental issue.…”

Numerical Model of Leachate Recirculation in Bioreactor Landfills with High Kitchen Waste Content

“…Landfilling is a commonly used MSW management method all around the world [1,2]. Due to the biochemical reaction of degradable components in MSW, the releasing of polluted leachate and landfill gas will be a long-term process that may take years even decades [3][4][5][6]. Therefore, it is of great necessity to reduce landfill emissions so as to avoid long-term environmental risks [7].…”