Influence of moisture content and leachate recirculation on oxygen consumption and waste stabilization in post aeration phase of landfill operation

Sohoo, Ihsanullah; Ritzkowski, Marco; Kuchta, Kerstin

doi:10.1016/j.scitotenv.2021.145584

Cited by 29 publications

(26 citation statements)

References 31 publications

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“…As the MSW sample used in this study was fresh and contained a high organic fraction, a short pre-aeration operation phase was realized in all the landfill simulation reactors to simulate initial aerobic decomposition of solid waste at open dumpsites, avoid unnecessary long lag phases, and reduce the intensity of acid formation anaerobic conditions [ 57 , 59 , 61 ]. In addition, various studies [ 61 , 62 ] suggested the pre-aeration operation as a pre-treatment of fresh waste (primarily comprising high organic content) prior to the anaerobic phase of landfill operation.…”

Section: Methodsmentioning

confidence: 99%

Municipal Solid Waste Management through Sustainable Landfilling: In View of the Situation in Karachi, Pakistan

Sohoo

Ritzkowski

Guo

et al. 2022

IJERPH

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Open disposal is the most common technique used for municipal solid waste (MSW) management due to the absence of sanitary landfills in Pakistan. The major cities and small towns in Pakistan have become a showcase of negligence and mismanagement of MSW, which results in deterioration of the environmental and social-life quality. Moreover, research has proved that inefficient handling (disposal) of MSW results in uncontrolled emissions of greenhouse gases (GHGs), mainly methane, and adds a significant share in global climate change. This study aims to estimate methane emissions from MSW disposed of at dumpsites and compare the GHG mitigation potential of different landfill strategies in specific climate and waste compositions in Karachi. The GHG estimations are based on lab-scale investigations conducted by simulating landfill conditions through the landfill simulation reactor (LSR) experiment. The synthetic MSW sample representing the composition of MSW generated in Karachi was used in the LSR experiment. Environmental sustainability and GHG mitigation potential of different landfilling strategies was evaluated by analyzing gas formation potential (GP21) and respiration activity (RI4) at the end of the experiment. This study revealed that the quantity of solid waste annually disposed of at dumpsites in Karachi possesses the potential to release about 3.9 Mt CO2-eq. methane (with specific methane potential of 1.8 tCO2-eq./tonne DM disposed) due to the biological decomposition of the organic fraction. Results show that the fresh waste disposed of at landfill sites in Karachi possesses about 92% and 94% higher GP21 and RI4, respectively, than the German allocated criteria for mechanically and biologically treated (MBT) waste for landfills Furthermore, sanitary landfills with post-aeration conditions showed higher GHG mitigation potential and low biological activity in the waste. The second highest GHG mitigation potential and lowest biological activity of the waste was noticed from bioreactor landfills with post-aeration conditions. The third number in GHG mitigation and reduced waste activity was noticed in the waste sampled from bioreactors without aftercare approach. The least GHG mitigation potential was noticed from the uncontrolled waste dumping (existing) approach with high residual gas potential and respiration index level. This lab-scale landfill simulation study can provide baseline data for further research and planning the development of new sustainable landfills in Karachi, Pakistan and in the region.

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Section: Methodsmentioning

confidence: 99%

Municipal Solid Waste Management through Sustainable Landfilling: In View of the Situation in Karachi, Pakistan

Sohoo

Ritzkowski

Guo

et al. 2022

IJERPH

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“…Figure 3 shows a scheme of sanitary landfill with landfill gas collection system and electrical energy (combined heat and power; CHP) generation facilities. However, landfills intended to be used for energy generation should be sustainably planned considering the aftercare phase when energy generation from landfill gas is not economically possible/feasible [52][53][54].…”

Section: Figurementioning

confidence: 99%

“…In Pakistan, there are deficiencies in the availability of funds, planning, technology, and trained workforce for proper and sustainable municipal solid waste management [58]. Even in major cities like Karachi, Lahore, Faisalabad, and Islamabad, municipal authorities are striving for the allocation of However, landfills intended to be used for energy generation should be sustainably planned considering the aftercare phase when energy generation from landfill gas is not economically possible/feasible [52][53][54].…”

Section: Municipal Solid Waste Management Situation In Pakistanmentioning

confidence: 99%

Estimation of Methane Production and Electrical Energy Generation from Municipal Solid Waste Disposal Sites in Pakistan

Sohoo

Ritzkowski

Sohu³

et al. 2021

Energies

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This work aimed to estimate the annual methane production from the municipal solid waste disposal sites in Pakistan. In this study, the Intergovernmental Panel on Climate Change (IPCC) default methodology was used to estimate theoretical methane formation potential of the waste disposal sites in major cities of Pakistan. The estimates of this study are based on the last population census conducted in the year 2017 and latest available data regarding the waste generation and management practices in the cities considered in the study. Results showed that 31.18 million tonnes of municipal solid waste (MSW) is generated annually. The top 10 major populated cities in Pakistan (with 20% share in country’s population) contributing 31% share in the total quantity of MSW generated in overall country. On average 50–60% of the MSW generated is collected and openly dumped at the designated waste disposal sites. After analyzing the data, we estimate that annually 12.8 MtCO2-eq of methane is emitted from the waste disposal sites in major cities considered in this study. The methane produced from the waste disposal sites can be sustainably utilized as a source of energy through transforming MSW disposal sites (open dumps) to sanitary landfills with methane capturing and utilization facilities. In the present scenario of waste management and methane formation potential, sanitary landfills would generate 62.35 MWh of electric power if 25% of the methane was recovered and utilized in power generation.

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“…The anaerobic degradation process of MSW can be divided into two stages simplified: the hydrolysis of cellulolytic matter (which provides most of the methane generation potential of MSW [38]) and methanogenesis [39]. The decomposition process can be idealized as Equation (8). In the hydrolysis stage, the cellulolytic matter is converted into typical volatile fatty acids (VFA, such as acetic acid), hydrogen (H 2 ), and carbon dioxide (CO 2 ).…”

Section: Hydro-biochem-mechanical-coupled Modelmentioning

confidence: 99%

“…Conventional sanitary landfills are designed without providing any processes to influence MSW degradation. The degradation rate of MSW is slow in the closed anaerobic environment in conventional landfills, which results in a quite long time of landfill stabilization process [8]. To fasten the stabilization of conventional landfills, a variety of techniques have been proposed in engineering practice.…”

Section: Introductionmentioning

confidence: 99%

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

Zhang

Liu

Jiang

et al. 2021

Water

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Surface spraying, horizontal trenches, and vertical wells are the most common leachate recirculation system used at landfills in engineering practice. In order to quantify the efficiency of the three aforementioned recirculation systems, a hydro–biochem–mechanical-coupled model was developed in the present work, which can describe hydrodynamic and biochemical behaviors in food-waste-rich landfills. A typical landfill cell was modeled in COMSOL. The results indicate that leachate recirculation can accelerate the decomposition of municipal solid waste (MSW) with food-rich waste content, relieving acidification, improving gas generation efficiency, and consequently, increasing the early settlement in landfills.

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Influence of moisture content and leachate recirculation on oxygen consumption and waste stabilization in post aeration phase of landfill operation

Cited by 29 publications

References 31 publications

Municipal Solid Waste Management through Sustainable Landfilling: In View of the Situation in Karachi, Pakistan

Municipal Solid Waste Management through Sustainable Landfilling: In View of the Situation in Karachi, Pakistan

Estimation of Methane Production and Electrical Energy Generation from Municipal Solid Waste Disposal Sites in Pakistan

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

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