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Arctic and Antarctica
Reference:

Investigation of methane formation processes during waste disposal in the northern territories

Zabelina Alexandra Victorovna

Practice teacher, ITMO University

197101, Russia, Saint Petersburg, Kronverksky ave., 49

zabelina-eco@mail.ru

DOI:

10.7256/2453-8922.2024.1.69462

EDN:

DMFOAF

Received:

26-12-2023


Published:

02-01-2024


Abstract: Methane is one of the most significant greenhouse gases. Unlike carbon dioxide, methane is a short – lived greenhouse gas with a lifetime of about 10 years, however, due to significantly higher greenhouse activity (according to scientists, it is at least 25 times greater than that of carbon dioxide), its effect on total global warming is very significant. Global warming processes have the greatest impact on the biosphere and ecosystem of the Arctic territories. The melting of permafrost can lead to changes in soil composition and geological processes. Therefore, the formation of methane in the Arctic and subarctic territories is quite an urgent issue. The purpose of this work is to study the amount of methane released in landfills of municipal solid waste. The article discusses the results of a study of methane formation processes at landfills close to the post-operational period. The data in the work were obtained by applying the technology of drilling an array of municipal waste. The article considered the polygons of the Subarctic and Arctic zones. The paper presents averaged data on the results of methane extraction at various landfills. It was found that the volume fraction of methane in the composition of landfill gas from the waste array disposed of over the past two years can reach 61%. However, in the approved methodology for calculating emissions from landfills of municipal solid waste (MSW), accounting for emissions over the past two years is advisory in nature, which creates prerequisites for adjusting the methodology based on the results of instrumental measurements. The results obtained make it possible to more accurately assess the carbon units obtained by introducing the best available technologies at MSW landfills, which is especially important in the framework of the implementation of the state policy of the Russian Federation in the Arctic for the period up to 2035.


Keywords:

MSW landfill, emissions, municipal solid waste, methane, mining, climate change, subarctic zone, landfill gases, measurement techniques, Arctic

This article is automatically translated.

1. Introduction

One of the zones in the Russian Federation for which the actual problem of correct accounting of methane and other emissions of pollutants and greenhouse gases in landfill gas is the Arctic zone. Despite the low population density, the need for highly efficient facilities for the treatment of MSW is quite relevant here. The climatic features of the location region, the geoecological features of the structure of MSW landfills, the technologies used in the placement of MSW, taking into account the best available technologies (BAT), together should be taken into account when calculating the formation and rationing of emissions.

According to the data of the consolidated reporting 2-TP (waste), formed by the Federal Service for Supervision of Environmental Management, as of the end of 2022, the disposal of production and consumption waste, in general, remains the main type of solid municipal waste management (hereinafter referred to as MSW) [1-4].  

Currently, the normalization and calculation of emissions from landfills of MSW is carried out according to the "Methodology for calculating the quantitative characteristics of emissions of pollutants into the atmosphere from landfills of solid household and industrial waste" approved in 2004 [5-8]. It calculates landfill gas emissions based on the amount of waste disposed with an increasing total for each calendar year. Emissions are calculated based on the content of the organic component, fat-like, carbohydrate-like and protein substances in organic matter, as well as taking into account the average humidity of waste.

The period of active methane release does not take into account the geochemical and climatic features of the region where the landfill is located; the last two years of waste disposal can be excluded from consideration due to the lack of stable methane release in the surface layers of the landfill body [9-13].

In addition, the 2004 methodology does not take into account the heterogeneity of the landfill body, the different density of waste depending on the depth of their occurrence and, accordingly, the uneven accumulation of landfill gas [14-16].

In order to confirm the hypothesis that the heterogeneity of the landfill body structure at the stage of post-operational maintenance and completion of the life cycle as a waste disposal facility leads to heterogeneity of landfill gas accumulations and emissions in the summer of 2022, a study of volume-density characteristics was conducted; in 2023, a gas-geochemical survey of the studied waste disposal facilities in the Leningrad Region and in the city of Norilsk. The studied polygons are approaching the period of reclamation.

 

The purpose of this study is to analyze the features of methane formation processes at MSW landfills.

 

2. Methodology and methods of research.

At the first stage of the research using the RTK (Real Time Kinematic) method, which consists in satellite positioning with a high degree of accuracy (up to 1 cm), in the mode of static definitions and movements from point to point during one study session with connection to the Geospider network [17], a topographic survey of the relief and contour was performed polygon bodies with a section of the relief horizontally through one meter. The received data was uploaded to the AutoCAD program.

At the second stage, drilling of pits for sampling was performed to study the volume-density characteristics of the MSW landfill [18, 19]. The volumetric density study was carried out only on the horizontal surface of the landfill, the lateral slopes were not studied due to the technical impossibility of installing drilling equipment on them. Samples were taken from the landfill body:  from the surface layer of waste and in layers at a depth of up to 51 meters. Such a sample was taken as a representative sample, which, when passing the well to a given depth, completely filled the volume of the core pipe, and when lifting which there was no loss of a significant part of the sample volume. To determine the volume of the sampled sample, measurements of the core pipe and the depth of the face were performed.

At the third stage, in order to study the composition of landfill gas in the surface layers of the spent landfill maps, a gas-geochemical survey of the territory was performed using the method of surface drilling of spent landfill maps with the installation of observation points. Air samples were taken from boreholes and the volume fraction of landfill gas components – CH4 and CO2 - was measured.

On the body of the polygon, access to the measurement point was carried out using a GPS navigator, measurement conditions and hindering factors were assessed. The study of the gas-air mixture obtained as a result of sampling was carried out at each point with a gas analyzer, the duct of which was connected through silicone nozzles to the borehole pipe.

The hole was driven to a depth of 0.8 meters, which corresponds to the depth of the last year of waste disposal. The research was carried out on an area of 5.7 hectares in 23 locations. The hole has a perforation at the depth of the sampling point for free air flow into the measuring path. The data obtained during the measurements were recorded in a field journal.

The measurements were carried out under meteorological conditions corresponding to the operating parameters of the measuring instruments. The surveys were carried out using devices PGA-1, PGA-300, MAG-6 P-V, which have operating manuals and valid verification certificates. The meteorological conditions during the measurements corresponded to acceptable ones.

 

3. The results of the study

The results of the study of the volume-density characteristics of the MSW landfill body are presented in Table 1.

The depth of the waste disposal layer from the surface, m

Density of landfill masses, t/m3

0-1

0,27

1-5

0,59

5-10

0,88

10-20

0,98

20-30

1,07

30-40

1,15

>40

1,19

 

The results of the experiment on measuring the volume-density characteristics of the MSW landfill showed that the density in the lower layers of waste disposal significantly exceeds the density in the surface layers of landfill masses.  

The results of the gas-geochemical study (Figure 2) and the measurement of concentrations of individual components of landfill gas showed the absence of detectable concentrations (below the detection limit), which allows us to conclude that waste disposed of more than 15 years ago does not participate in the formation of landfill gas.

Due to the natural processes of settling of the landfill body under the influence of gravity, landfill gas moved from the waste layers placed more than 15 years ago to the upper layers through natural man-made ruptures. The implementation of active degassing contributed to the release of landfill gas from the lower layers of waste, which currently represent a stable and inert base of the landfill body.

Figure 2. The process of gas-geochemical research at the municipal solid waste disposal facility[20].

During the experiment, data were also obtained on significant concentrations of methane in the upper layers of waste disposed over the last two years of operation of the MSW landfill, which are not taken into account when calculating, rationing and controlling emissions from waste disposal facilities.  The results of a gas-geochemical survey with data on the volume fractions of methane and carbon dioxide concentrations are presented in Table 2.  

Table 2 – Results of gas-geochemical studies

Number of the selection point

Methane,

% (vol.d.)

Carbon monoxide,

% (vol.d.)

1

1,11

0,00

2

0,46

11,02

3

61,00

10,56

4

37,80

10,89

5

36,60

11,21

6

48,30

10,55

7

3,55

10,98

8

33,50

11,68

9

11,20

11,88

10

0,05

0,24

11

35,80

10,05

12

29,80

1,43

13

15,50

10,98

14

14,90

11,51

15

0,00

0,00

16

14,70

11,12

17

34,20

10,85

18

11,50

11,81

19

5,51

11,22

20

8,30

11,55

21

11,50

10,95

22

0,41

7,78

23

57,40

11,68

The average annual rate at a depth of 0.8 m

21,85

9,13

 

The waste that is placed in the landfill begins to emit methane within a few months after its placement. In the first year, methane release usually reaches a peak, as the biological decomposition of organic materials begins in the absence of oxygen. In the future, the rate of methane release decreases, but methane continues to be released for many years, sometimes decades after the landfill is closed. According to the results of the field study, the presence of methane in the waste of the first year of placement in a volume fraction from 0 to 61%, carbon dioxide in a volume fraction from 0 to 11.88% was found. According to European climate standards [12-15], such methane release is considered significant and can have an impact on the greenhouse effect. Thus, these landfills of MSW can be considered as a significant source of greenhouse gas emissions.

 

4. Conclusions.

As the results of volume-density studies and gas-chemical examination have shown, the density in the lower layers of municipal solid waste is significantly higher than in the layers later in time of placement, the amount of landfill gas released is not significant. At the same time, active methane formation occurs in the upper layers of the waste mass at the depths corresponding to the first year of waste disposal.

The current methodology for calculating emissions from MSW landfills does not consider the features of methane extraction at different stages of the landfill life cycle. Emissions from the decomposition of waste over the last two years of disposal are not taken into account in the calculations of emissions, which creates prerequisites for adjusting the methodology based on the results of instrumental measurements.

In general, it can be argued that clarifying information on landfill gas emissions at MSW landfills based on instrumental measurements will allow for more reliable results in calculating emissions and determining possible carbon units when introducing BAT.  Accurate calculation of landfill gas emissions and their disposal fully meets the goals of environmental protection and rational nature management in the Arctic zone.

References
1. Rosprirodnadzor. (2023). Analytical data. Statistical reporting: information on the formation, processing, disposal, neutralization, disposal of production and consumption waste. Rosprirodnadzor. Retrieved from https://rosprirodnadzor.rpn.gov.ru/open-service/analytic-data/statistic-reports/production-consumption-waste
2EEA. (2023). Waste recycling in Europe. Retrieved from https://www.eea.europa.eu/ims/waste-recycling-in-europe
3. McQuibban, J. (2021). Cities Programme Coordinator at Zero Waste Europe The state of zero waste municipalities report. Retrieved from https://zerowastecities.eu/wp-content/uploads/2021/12/SZWMR_2021-Final.pdf
4. Laurieri, N. et al. (2020). A Door-to-DoorWaste Collection System Case Study: A Survey on its Sustainability and Effectiveness. Sustainability, 12(14), 5520.
5Methodology for calculating the quantitative characteristics of emissions of pollutants into the atmosphere from landfills of solid household and industrial waste. (2004). Moscow: AKH im. Pamfilova.
6. Travin, I., & Shmelev, A. L. (2023). RDF fuel. Foreign experience and prospects for use in Russia. [Electronic resource]. Retrieved from https://7greenline.ru/novosti/news_post/rdf-toplivo-zarubezhnyy-opyt-i-perspektivyispolzovaniya-v-rossii
7. Valineeva, A. A., & Stepanova, T. A. (2020). RDF as an alternative energy source. Electronic scientific journal “Engineering Bulletin of the Don”, 3. Retrieved from ivdon.ru/ru/magazine/archive/n3y2020/6377
8. Calabrò, P.S., & Komilis, D.A. (2019). Standardized inspection methodology to evaluate municipal solid waste collection performance. J. Environ. Manag, 246, 184–191.
9. Xue, B., Chen, X.P., Geng, Y., Guo, X.J., Lu, C.P., Zhang, Z.L., & Lu, C.Y. (2010). Survey of officials’ awareness on circular economy development in China: Based on municipal and county level. Resour. Conserv. Recycl., 54, 1296–1302.
10. Seyring, N., Dollhofer, M., Weißenbacher, J., Herczeg, M., & David, M. (2015). Assessment of separate collection schemes in the 28 capitals of the EU. Waste Manag. Res., 34, 947–956.
11. Yadav, V., & Karmakar, S. (2020). Sustainable collection and transportation of municipal solid waste in urban centers. Sustain. Cities Soc., 53, 101937.
12. Rodrigues, S., Martinho, G., & Pires, A. (2016). Waste collection systems. Part A: A taxonomy. J. Clean. Prod., 113, 374–387.
13. Yaman, C. (2020). Investigation of greenhouse gas emissions and energy recovery potential from municipal solid waste management practices. Environ. Dev., 33, 100484.
14. Das, S., Bhattacharyya, B.K. (2015). Optimization of municipal solid waste collection and transportation routes. Waste Manag, 43, 9–18.
15. Stoeva, K., Alriksson, S. (2017). Influence of recycling programmes on waste separation behaviour. Waste Manag., 68, 732–741.
16. Casazza, M., Huisingh, D., Ulgiati, S., Severino, V., Liu, G., & Lega, M. (2019). Product service system-based municipal solid waste circular management platform in campania region (Italy): A preliminary analysis. Procedia CIRP, 83, 224–229.
17. Paes, M.X., de Medeiros, G.A., Mancini, S.D., Bortoleto, A.P., Puppim de Oliveira, J.A., & Kulay, L.A. (2020). Municipal solid waste management: Integrated analysis of environmental and economic indicators based on life cycle assessment. J. Clean. Prod., 254, 119848.
18The unique satellite network of differential geodetic stations "Geospider". Retrieved from http://geospider.ru
19Berg-project LLC. (2022). Report on the work performed to determine the volume and density characteristics of the landfill of solid household and construction waste in the village of Zamostye, Gatchina district, Leningrad region. St. Petersburg: Berg-project LLC.
20Technoterra LLC. (2023). 109-23-EI. Report on the results of environmental research. St. Petersburg: Technoterra LLC.

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The subject of the study, according to the author, is the peculiarities of studying and researching the processes of methane formation during the disposal of waste at landfills in the northern territories. Research methodology based on the analysis of the article, it can be concluded that several techniques are used: at the 1st stage of research using the RTK (Real Time Kinematic) method, which consists in satellite positioning with a high degree of accuracy, in the mode of static definitions and movements from point to point during one research session connected to the Geospider network, there was topographic survey of the relief and contour of the landfill body with a section of the relief horizontally through one meter was performed; at stage 2, drilling of pits for sampling was performed to study the volume and density characteristics of the MSW landfill; at stage 3, a gas-geochemical survey of the territory was performed by surface drilling of spent maps to study the composition of landfill gas in the surface layers of spent landfill maps landfill with the installation of observation points and air sampling from boreholes and measurement of the volume fraction of landfill gas components – CH4 and CO2. The measurements were carried out under meteorological conditions corresponding to the operating parameters of the measuring instruments. The relevance of the topic of monitoring is unconditional, accounting for methane and other emissions of pollutants and greenhouse gases as part of landfill gas, the Arctic zone is one of the zones in the Russian Federation for which, despite the low population density, the need for highly efficient MSW facilities is quite relevant here. At the same time, the climatic features of the region, the geoecological features of the structure of MSW landfills, the technologies used in the placement of MSW, taking into account the best available technologies, should be taken into account in the calculation of formation and rationing of emissions. The scientific novelty lies in the attempt of the author of the article, based on the conducted research, the results of volume-density studies and gas-chemical examination were obtained in the lower layers of solid municipal waste, the density is significantly higher than in later layers, the amount of landfill gas released is not significant, at the same time in the upper layers in the mass of waste at depths corresponding to the first in the year of waste disposal, active methane formation occurs. Style, structure, content the style of presentation of the results is quite scientific. However, there are a number of wishes, in particular, the author of the article should, in our opinion, have abbreviations in the title of the article, in particular MSW - solid municipal waste. The article is provided with rich illustrative material reflecting the process of determining the effectiveness of gas extraction methods. The tables and photos are illustrative. The author of the article correctly notes that it is necessary to clarify information on landfill gas emissions at MSW landfills based on instrumental measurements to obtain more reliable results in calculating emissions and determining possible carbon units when implementing the best available technologies. The bibliography is very comprehensive for the formulation of the issue under consideration, contains references to normative legal acts. The appeal to the opponents is presented in identifying the problem at the level of available information obtained by the author as a result of the analysis. Conclusions, the interest of the readership in the conclusions there are generalizations that allow us to apply the results obtained. The target group of information consumers is not specified in the article.