Quality and Quantity of Leachate in Aerobic Pilot-Scale Landfills

Abstract

In this study, two pilot-scale aerobic landfill reactors with (A1) and without (A2) leachate recirculation are used to obtain detailed information on the quantity and quality of leachate in aerobic landfills. The observed parameters of leachate quality are pH, chloride (Cl-), chemical oxygen demand (COD), biological oxygen demand (BOD), total Kjeldahl nitrogen (TKN), ammonia nitrogen (NH3-N), and nitrate (NO3(-)-N). pH values of the leachate increased to 7 after 50 days in reactor A1 and after 70 days in reactor A2. Cl- concentrations increased rapidly to 6100 (A1) and 6900 (A2) mg/L after 80 days, from initial values of 3000 and 2800 mg/L, respectively. COD and BOD values decreased rapidly in the A1 landfill reactor, indicating the rapid oxidation of organic matter. The BOD/COD ratio indicates that leachate recirculation slightly increases the degradation of solid waste in aerobic landfills. NH3-N concentrations decreased as a result of the nitrification process. Denitrification occurred in parts of the reactors as a result of intermittent aeration; this process causes a decrease in NO3(-) concentrations. There is a marked difference between the A1 and A2 reactors in terms of leachate quantity. Recirculated leachate made up 53.3% of the leachate generated from the A1 reactor during the experiment, while leachate quantity decreased by 47.3% with recirculation when compared with the aerobic dry landfill reactor.

Microorganisms in landfill bioreactors for accelerated stabilization of solid wastes

“…Nowadays, such landfills are often designated as bioreactor landfills and landfill bioreactors (LBRs) (7e9). Furthermore, recently developed aerobic LBRs with aeration provide more rapid biodegradation of organic matter, reduced methane production, and enhanced ammoniaenitrogen removal (10,11). Such advantages minimize the health and environmental risks and allow for greater free space availability, thereby extending the landfill site life and reducing costs (12,13).…”

A case study of an holistic approach to leachate and storm-water management developed at a municipal landfill site

“…High hydraulic transmissivity of the buried layers of waste allow for the recirculation of significantly larger water fluxes (some 40,000 m 3 /year in the Ajdovščina case) when compared to anaerobic and even aerobic bioreactorlandfills (e.g., Bilgili et al [13]) of comparable capacity, flushing the landfill vadose and saturated zones continually (Figs 1 and 5) rather than just filling up the pore volume up to the extent until field moisture capacity is attained. This results in fast and cheap stabilization, mineralization and decontamination of the landfill interior, nearly acquired during the first 5 years after the completion of a particular landfill section.…”

Pattern of Characteristics of Leachate Generation from Municipal Solid Waste Landfill by Lysimeter Experiment

“…(1) to simulate of leachate TDS obtained C max , k, and R 2 is shown in Table III. Compared to research by [7], TDS in the lysimeter experimental show considerable differences, especially after passing maximum stage. It is caused higher organic waste in the lysimeter.…”

“…Through landfill lysimeter experiment diameter of 1.52 m and a height of 1.52 m was obtained that the percolation between 0.12 to 11.44 cm per year of 95.72 cm of precipitation water per year [6]. Results of a study conducted by [7] note that with the addition of leachate through the recirculation will enhance the degradation process of waste that marked concentrations of BOD and COD are more likely to trash the recirculated.…”

“…Filling continuity of waste will cause differences TDS concentrations in the leachate. Landfill is active, the waste is additions continuity and result of fluctuations TDS [10] Compared with the results of research by [7], the TDS in the lysimeter leachate experimental results show considerable differences, especially after passing through T1 or maximum stage. This is because organic waste is significant in the experiment.…”