Pilot scale evaluation of a model to distinguish the rates of simultaneous anaerobic digestion, composting and methane oxidation in static waste beds

Rafiee, Reza; Obersky, Lizanne; Xie, Sihuang; Clarke, William P.

doi:10.1016/j.wasman.2017.11.003

Cited by 11 publications

(4 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The described rates (r AD , r OX and r COM ) have been previously estimated in laboratory reactors that contained packed beds of waste overlain with soil sourced from the same landfill (Rafiee et al, 2018). These rates were determined from the measurement of the net fluxes of CH 4 , CO 2 , O 2 and 13 C-CO 2 with mass balances for each of these four components.…”

Section: Mass and Isotope Balancesmentioning

confidence: 99%

Methodology to determine the extent of anaerobic digestion, composting and CH4 oxidation in a landfill environment

et al. 2018

Self Cite

View full text Add to dashboard Cite

An examination of the processes contributing to the production of landfill greenhouse gas (GHG) emissions is required, as the actual level to which waste degrades anaerobically and aerobically beneath covers has not been differentiated. This paper presents a methodology to distinguish between the rate of anaerobic digestion (r), composting (r) and CH oxidation (r) in a landfill environment, by means of a system of mass balances developed for molecular species (CH, CO) and stable carbon isotopes (δC-CO and δC-CH). The technique was applied at two sampling locations on a sloped area of landfill. Four sampling rounds were performed over an 18 month period after a 1.0 m layer of fresh waste and 30-50 cm of silty clay loam had been placed over the area. Static chambers were used to measure the flux of the molecular and isotope species at the surface and soil gas probes were used to collect gas samples at depths of approximately 0.5, 1.0 and 1.5 m. Mass balances were based on the surface flux and the concentration of the molecular and isotopic species at the deepest sampling depth. The sensitivity of calculated rates was considered by randomly varying stoichiometric and isotopic parameters by ±5% to generate at least 500 calculations of r, r and r for each location in each sampling round. The resulting average value of r and r indicated anaerobic digestion and composting were equally dominant at both locations. Average values of r ranged from 9.8 to 44.5 g CO m d over the four sampling rounds, declining monotonically at one site and rising then falling at the other. Average values of r ranged from 10.6 to 45.3 g CO m d. Although the highest average r value occurred in the initial sampling round, all subsequent r values fell between 10 and 20 g CO m d. r had the smallest activity contribution at both sites, with averages ranging from 1.6 to 8.6 g CO m d. This study has demonstrated that for an interim cover, composting and anaerobic digestion of shallow landfill waste can occur simultaneously.

show abstract

Section: Mass and Isotope Balancesmentioning

confidence: 99%

Methodology to determine the extent of anaerobic digestion, composting and CH4 oxidation in a landfill environment

et al. 2018

Self Cite

View full text Add to dashboard Cite

show abstract

“…This paper outlines the many processes, including anaerobic digestion, composting, hydrothermal carbonization, pyrolysis, and landfilling, that are utilized in practice to recover important resources (such as bio-oil, biochar, and biomethane) from OFMSW. [14]. Regulating bacterial dynamics by lime addition to enhance kitchen waste composting.…”

Section: Literature Reviewmentioning

confidence: 99%

Study on Solid Waste Home Composting Process by Using Piping System

2023

IRJMETS

View full text Add to dashboard Cite

This study investigates the effectiveness of a solid waste home composting process using a piping system and leachate recirculation to enhance compost quality. As waste generation and environmental concerns increase, home composting offers an eco-friendly solution for waste disposal and organic fertilizer production. However, traditional methods face challenges like odor, pests, and limited space. To overcome these challenges, a piping system was developed to enable leachate recirculation. Recirculating leachate optimizes nutrient distribution and microbial growth, accelerating decomposition and improving compost quality. Experimental trials using various household organic waste materials were conducted and the impact of leachate recirculation was studied. Results demonstrate that the piping system, with leachate recirculation, significantly enhances composting. Leachate recirculation improves nutrient absorption, increases microbial activity, and maintains moisture balance. Incorporating leachate recirculation in the piping system produces high-quality compost with reduced odor. The study presents an economical, space-efficient model using vertical pipes and cow dung, addressing landfill accumulation while producing compost suitable for plant fertilization. The anaerobic method employed mitigates odor and fly problems. Detailed analysis of compost properties and waste composition enriches understanding of the composting process. Implementing leachate recirculation in home composting holds significant potential for sustainable waste management aligned with environmental goals which leads to minimizing the waste at source level.

show abstract

“…When O 2 is present in landfill, CH 4 can be oxidized by methanotrophs . The CH 4 oxidation can be described by the equation as follows:

{CH}_{4} + 1.5 O_{2} \to 0.5 {CO}_{2} + 0.5 - normalC H_{2} normalO - + 1.5 H_{2} normalO + heat

where, CH 2 O, represents biomass.…”

Section: Numerical Simulationmentioning

confidence: 99%

Simulation of gas concentration during the process of air injection and extraction in a landfill

Liu

Yu³

et al. 2020

Env Prog and Sustain Energy

View full text Add to dashboard Cite

Old landfills require pre‐aeration before excavation to reduce the emissions of volatile organic compounds and methane. Variation and distribution of gas species during landfill aeration is important in designing an aeration system and evaluating aeration progress. Limited research is conducted on the variation of gas concentration in aerobic landfills considering methane oxidation and aerobic waste degradation. In this study, a numerical model is developed considering reactions to simulate the changes in methane, oxygen, and carbon dioxide concentrations in landfills during air injection and extraction. Parameter sensitivity analyses are conducted to evaluate the effects of permeability, dispersion coefficient, maximum methane oxidation rate, and oxygen consumption rate on simulation results. Results show that the model is sensitive to oxygen consumption rate. Overall, the application of this model in aerobic landfills provides a practical method to predict gas concentration variation. This model can be used in the optimal design of in situ aeration system.

show abstract

Pilot scale evaluation of a model to distinguish the rates of simultaneous anaerobic digestion, composting and methane oxidation in static waste beds

Cited by 11 publications

References 30 publications

Methodology to determine the extent of anaerobic digestion, composting and CH4 oxidation in a landfill environment

Methodology to determine the extent of anaerobic digestion, composting and CH4 oxidation in a landfill environment

Study on Solid Waste Home Composting Process by Using Piping System

Simulation of gas concentration during the process of air injection and extraction in a landfill

Contact Info

Product

Resources

About