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Pelkonen, Markku
Alternative names
Publications (10 of 17) Show all publications
Bauer, T., Pelkonen, M. & Lagerkvist, A. (2022). Co-digestion of sewage sludge and wood fly ash. Environmental technology, 43(12), 1853-1859
Open this publication in new window or tab >>Co-digestion of sewage sludge and wood fly ash
2022 (English)In: Environmental technology, ISSN 0959-3330, E-ISSN 1479-487X, Vol. 43, no 12, p. 1853-1859Article in journal (Refereed) Published
Abstract [en]

This study uses a new approach for the recycling of plant nutrients by co-digesting sewage sludgewith fly ash from a wood combustion. Sewage sludge and fly ash both are enriched with nutrientsof the wastewater resp. wood, which makes these products an enhanced source for recycledfertilizers. The effects of the ash addition to the anaerobic digestion are studied in several labscale experiments including effects on the gas production and microbial activity. Following that,the fertilizing qualities of the digestate are evaluated by plant growth experiments. The resultsshow that the fertilizing qualities of the digested sludge were improved by the ash addition.Next to this, gas production results show that the methane production was not affected by theash addition, while the total gas release was reduced. The sulphur addition by the ashstimulated sulphate reducing bacteria. The sulphate reducing bacteria did not markedly inhibitthe methanogens.

Place, publisher, year, edition, pages
Taylor & Francis, 2022
Keywords
Anaerobic digestion, sewage sludge, ash, co-digestion, nutrient recycling
National Category
Other Environmental Engineering Other Environmental Biotechnology
Research subject
Waste Science and Technology
Identifiers
urn:nbn:se:ltu:diva-81973 (URN)10.1080/09593330.2020.1856937 (DOI)000597848000001 ()33301703 (PubMedID)2-s2.0-85106805373 (Scopus ID)
Funder
Swedish Energy AgencySwedish Research Council Formas, 2018-00194
Note

Validerad;2022;Nivå 2;2022-05-06 (hanlid)

Available from: 2020-12-14 Created: 2020-12-14 Last updated: 2023-04-20Bibliographically approved
Pelkonen, M. & Wang, Y. (2017). Leachate direct-discharge limits and incentives related to landfill aftercare costs (ed.). Paper presented at International Conference on Waste Management and Technology : 29/10/2014 - 31/10/2014. Journal of Material Cycles and Waste Management, 19(1), 413-422
Open this publication in new window or tab >>Leachate direct-discharge limits and incentives related to landfill aftercare costs
2017 (English)In: Journal of Material Cycles and Waste Management, ISSN 1438-4957, E-ISSN 1611-8227, Vol. 19, no 1, p. 413-422Article in journal (Refereed) Published
Abstract [en]

Society needs sustainable methods for landfilling from an environmental perspective, but they have to be cost effective and affordable. Aftercare represents considerable costs within waste management system and costs can be expected to accrue over a long period of time showing the need to compare different management options. Direct-discharge limits for leachate COD and nitrogen are different in various (European) countries. When leachate COD or nitrogen has decreased at the latter part of the aftercare period, effluent limits 50 or 200 mg/l for COD and 10 or 70 mg/l for nitrogen have a considerable impact on period length. The objective of this paper is to discuss the effects of leachate discharge limits on landfill aftercare and leachate management costs in various conditions. Landfill simulator results and modelling are used to estimate leachate concentrations in three different scenarios. It is suggested that stricter discharge limits (shown before) impact on the costs of activated carbon filtration (1.4-fold) and biological treatment (1.1–1.24-fold). Stricter limits also extend the aftercare period length considerably, but with substantial water circulation the differences are clearly smaller. These results support the recent suggestion of aftercare incentives, and some details of applying these incentives in different conditions are discussed.

Place, publisher, year, edition, pages
Springer, 2017
Keywords
Landfill leachate management, Nitrogen, COD, Discharge limits, Landfill aftercare costs, Incentives
National Category
Other Environmental Engineering
Research subject
Waste Science and Technology
Identifiers
urn:nbn:se:ltu:diva-35047 (URN)10.1007/s10163-015-0433-4 (DOI)000392385300042 ()2-s2.0-84944563631 (Scopus ID)96cc346d-88fe-4b5f-ae15-5d89c003965f (Local ID)96cc346d-88fe-4b5f-ae15-5d89c003965f (Archive number)96cc346d-88fe-4b5f-ae15-5d89c003965f (OAI)
Conference
International Conference on Waste Management and Technology : 29/10/2014 - 31/10/2014
Note

Konferensartikel i tidskrift

Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2020-08-11Bibliographically approved
Lagerkvist, A., Pelkonen, M. & Wikström, T. (2015). Quick-start of full-scale anaerobic digestion (AD) using aeration (ed.). Waste Management, 38, 102-104
Open this publication in new window or tab >>Quick-start of full-scale anaerobic digestion (AD) using aeration
2015 (English)In: Waste Management, ISSN 0956-053X, E-ISSN 1879-2456, Vol. 38, p. 102-104Article in journal (Refereed) Published
Abstract [en]

A conventional 1300 m3 continuously stirred anaerobic tank reactor at the city of Boden, north Sweden, which was receiving a feed of both sewage sludge and food waste, was put out of operation due to the build-up of a float phase. The reactor was emptied and cleaned. At start-up there was no methanogenic sludge available, so an unconventional start-up procedure was applied: The reactor was rapidly (8 days with 1200 kg of total solids (TS) added daily) filled with thickened, and slightly acidic sewage sludge, showing only slight methane generation, which was subsequently heated to 55 °C. Then compressed air was blown into the digester and within a month a fully functional methanogenic culture was established. The transfer from acidogenic to methanogenic conditions happened in about one week. As a start-up technique this is fast and cost efficient, it only requires the access of a compressor, electricity and a source of air. In total, about 16 tonnes of oxygen were used. It is proposed that this method may also be used as an operational amendment technique, should a reactor tend to acidify.

National Category
Other Environmental Engineering
Research subject
Waste Science and Technology
Identifiers
urn:nbn:se:ltu:diva-5077 (URN)10.1016/j.wasman.2014.12.016 (DOI)000353176600013 ()25636861 (PubMedID)2-s2.0-84933671527 (Scopus ID)3178f0e2-0ebd-4838-b040-1b17e9ecedda (Local ID)3178f0e2-0ebd-4838-b040-1b17e9ecedda (Archive number)3178f0e2-0ebd-4838-b040-1b17e9ecedda (OAI)
Note

Validerad; 2015; Nivå 2; 20150129 (andbra)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2023-09-08Bibliographically approved
Wang, Y., Pelkonen, M. & Kaila, J. (2014). Are there carbon and nitrogen sinks in the landfills? (ed.). Sustainable Environment Research, 24(6), 423-429
Open this publication in new window or tab >>Are there carbon and nitrogen sinks in the landfills?
2014 (English)In: Sustainable Environment Research, ISSN 1022-7636, Vol. 24, no 6, p. 423-429Article in journal (Refereed) Published
Abstract [en]

The management of sanitary landfills after closure is an important engineering, economic and sustainability issue. The society needs sustainable methods for landfilling from an environmental perspective but it has to be cost-effective and affordable for a society as well. Compared with inorganics, carbon and nitrogen are more reactive. It is important to identify the time needed for them to achieve the limit values of leachate emission (i.e., the length of aftercare period). However, does it mean that the environmental impacts have been minimized after the active aftercare period? Especially at low temperature, the decomposition rate and release rate of carbon and nitrogen are lower; so the leachate emission concentrations are lower and it is easier to achieve the emission limit values. In these conditions the residual carbon and nitrogen remaining in the landfill are higher, but according to the results this is not a practical problem. In the degradation of stable humic compounds, carbon and nitrogen sinks are formed. Their fraction in the organics seems to be comparable with waste treated in mechanical-biological way and has impact as a sink. The humification process seems to be affected by temperature, but more knowledge is still needed like total balances of humic substances. It is necessary to discuss the performance of carbon and nitrogen within aftercare (active aftercare) and after aftercare (passive aftercare). The solutions should be designed accordingly from both environmental and economic considerations.

National Category
Other Environmental Engineering
Research subject
Waste Science and Technology
Identifiers
urn:nbn:se:ltu:diva-7612 (URN)2-s2.0-84923642806 (Scopus ID)600db543-58bf-4660-8770-7fd98a0d7388 (Local ID)600db543-58bf-4660-8770-7fd98a0d7388 (Archive number)600db543-58bf-4660-8770-7fd98a0d7388 (OAI)
Note

Godkänd; 2014; 20150521 (andbra)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2024-01-11Bibliographically approved
Wikström, T., Nordmark, D., Pelkonen, M. & Lagerkvist, A. (2012). Fluorescent in situ hybridization technique in anaerobic process studies (ed.). In: (Ed.), Anders Lagerkvist (Ed.), Abstract proceedings of 7th Intercontinental Landfill Research Symposium :: Södra Sunderbyn, June 25th to 27th, 2012. Paper presented at Intercontinental Landfill Research Symposium : 25/06/2012 - 27/06/2012 (pp. 130-131). Luleå: Luleå tekniska universitet
Open this publication in new window or tab >>Fluorescent in situ hybridization technique in anaerobic process studies
2012 (English)In: Abstract proceedings of 7th Intercontinental Landfill Research Symposium :: Södra Sunderbyn, June 25th to 27th, 2012 / [ed] Anders Lagerkvist, Luleå: Luleå tekniska universitet, 2012, p. 130-131Conference paper, Meeting abstract (Refereed)
Place, publisher, year, edition, pages
Luleå: Luleå tekniska universitet, 2012
National Category
Other Environmental Engineering
Research subject
Waste Science and Technology
Identifiers
urn:nbn:se:ltu:diva-40159 (URN)f2ab3715-3c5a-48bb-8ea4-920c05bbafa3 (Local ID)978-91-7439-462-7 (ISBN)f2ab3715-3c5a-48bb-8ea4-920c05bbafa3 (Archive number)f2ab3715-3c5a-48bb-8ea4-920c05bbafa3 (OAI)
Conference
Intercontinental Landfill Research Symposium : 25/06/2012 - 27/06/2012
Note
Godkänd; 2012; 20120614 (ysko)Available from: 2016-10-03 Created: 2016-10-03 Last updated: 2023-09-06Bibliographically approved
Pelkonen, M. & Yu, W. (2012). Long term leachate management based on anaerobic/aerobic landfill simulator studies (ed.). In: (Ed.), Anders Lagerkvist (Ed.), Abstract proceedings of 7th Intercontinental Landfill Research Symposium: Södra Sunderbyn, June 25th to 27th, 2012. Paper presented at Intercontinental Landfill Research Symposium : 25/06/2012 - 27/06/2012 (pp. 103-104). Luleå: Luleå tekniska universitet
Open this publication in new window or tab >>Long term leachate management based on anaerobic/aerobic landfill simulator studies
2012 (English)In: Abstract proceedings of 7th Intercontinental Landfill Research Symposium: Södra Sunderbyn, June 25th to 27th, 2012 / [ed] Anders Lagerkvist, Luleå: Luleå tekniska universitet, 2012, p. 103-104Conference paper, Meeting abstract (Refereed)
Place, publisher, year, edition, pages
Luleå: Luleå tekniska universitet, 2012
National Category
Other Environmental Engineering
Research subject
Waste Science and Technology
Identifiers
urn:nbn:se:ltu:diva-40749 (URN)ffe04095-0715-4ffb-9c6a-1c119fec6c9b (Local ID)978-91-7439-462-7 (ISBN)ffe04095-0715-4ffb-9c6a-1c119fec6c9b (Archive number)ffe04095-0715-4ffb-9c6a-1c119fec6c9b (OAI)
Conference
Intercontinental Landfill Research Symposium : 25/06/2012 - 27/06/2012
Note
Godkänd; 2012; 20120614 (ysko)Available from: 2016-10-03 Created: 2016-10-03 Last updated: 2023-09-06Bibliographically approved
Wang, Y., Pelkonen, M. & Kaila, J. (2012). Optimization of landfill leachate management in the aftercare period (ed.). Waste Management & Research, 30(8), 789-799
Open this publication in new window or tab >>Optimization of landfill leachate management in the aftercare period
2012 (English)In: Waste Management & Research, ISSN 0734-242X, E-ISSN 1096-3669, Vol. 30, no 8, p. 789-799Article in journal (Refereed) Published
Abstract [en]

The management of sanitary landfills after closure is an important engineering, economic and sustainability issue and is referred to as the greatest unresolved landfill challenge. Most sanitary landfills are operated according to the dry tomb principle, resulting in aftercare periods of hundreds of years. To study landfill body behaviour, long-term leachate emissions were studied with anaerobic landfill simulators, and a forecast model was developed targeting the behaviour of NH4-N, COD and chlorides as a function of temperature and the L/S-ratio (liquid-to-solid). It was found that NH4-N is the decisive factor in leachate management, requiring the highest L/S-ratio (around 6) to meet the direct discharge limit values. Various scenarios were constructed to find optimal leachate management strategies both in large (waste height H = 25 m) and medium-sized landfills (H = 10 m) with corresponding temperature ranges. The results show that by minimizing the aftercare period length with leachate pre-treatment and recirculation, both sustainability and economic benefits can be achieved. The results provide new views on how to manage the long-term leachate aftercare problem. In the case of large landfills, further efforts are needed to reach stabilization within a reasonable time frame.

National Category
Other Environmental Engineering
Research subject
Waste Science and Technology
Identifiers
urn:nbn:se:ltu:diva-5853 (URN)10.1177/0734242X12440483 (DOI)000306837200005 ()22605021 (PubMedID)2-s2.0-84864744230 (Scopus ID)40a3a6fc-5932-46fd-930d-ea10e0423213 (Local ID)40a3a6fc-5932-46fd-930d-ea10e0423213 (Archive number)40a3a6fc-5932-46fd-930d-ea10e0423213 (OAI)
Note
Validerad; 2012; 20120521 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2023-05-08Bibliographically approved
Wang, Y., Pelkonen, M. & Kaila, J. (2012). Strategies to enhance the biological nitrogen removal of high-strength ammonium and low C/N landfill leachate with the SBR process (ed.). Environmental technology, 33(5), 579-588
Open this publication in new window or tab >>Strategies to enhance the biological nitrogen removal of high-strength ammonium and low C/N landfill leachate with the SBR process
2012 (English)In: Environmental technology, ISSN 0959-3330, E-ISSN 1479-487X, Vol. 33, no 5, p. 579-588Article in journal (Refereed) Published
Abstract [en]

The treatment of high ammonium-nitrogen concentration landfill leachate has become an increasing problem because of the requirements to reduce nutrient emissions. A laboratory-scale sequential batch reactor (SBR) was operated and tested in order to optimize the operational strategies of a cost-saving method to enhance the removal of ammonium-nitrogen from a real landfill leachate. Two sequence schemes were tested, one with long non-aerated/aerated sequences and another with short sequences. The air supply levels with low to intermediate dissolved oxygen (DO) and external carbon addition were altered. With both schemes a high ammonium reduction (>99%) and a reasonable total nitrogen (TN) reduction (around 60%) could be achieved with strong carbon limitation (BOD 7/N=1.1). Chemical oxygen demand (COD) removal was lower with longer sequences. Denitrification via nitrite seemed to be an important part of TN removal, controlled with the low DO. With increasing nitrite accumulation COD/N removed decreased in both schemes indicating clearly a more efficient use of COD. The scheme with short sequences indicated advantages to save the air supply preventing nitrite oxidation under low air supply conditions and better TN and COD removal efficiencies. The results show that an applicable operational strategy can be found resulting in a reasonable pre-treatment option in landfills, requiring less carbon and aeration energy.

National Category
Other Environmental Engineering
Research subject
Waste Science and Technology
Identifiers
urn:nbn:se:ltu:diva-2730 (URN)10.1080/09593330.2011.586057 (DOI)000303579700011 ()22629632 (PubMedID)2-s2.0-84859198302 (Scopus ID)06a73a4b-a7a9-4436-b16a-b222fcd9dffa (Local ID)06a73a4b-a7a9-4436-b16a-b222fcd9dffa (Archive number)06a73a4b-a7a9-4436-b16a-b222fcd9dffa (OAI)
Note
Validerad; 2012; 20120411 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2023-05-08Bibliographically approved
Wang, Y., Pelkonen, M. & Kaila, J. (2011). Cost-saving biological nitrogen removal from strong ammonia landfill leachate (ed.). Waste Management & Research, 29(8), 797-806
Open this publication in new window or tab >>Cost-saving biological nitrogen removal from strong ammonia landfill leachate
2011 (English)In: Waste Management & Research, ISSN 0734-242X, E-ISSN 1096-3669, Vol. 29, no 8, p. 797-806Article in journal (Refereed) Published
Abstract [en]

The aim of the study was to develop an improved management mode in Ammassuo landfill (Finland) for leachate ammonium-nitrogen removal, to minimize the leachate management costs and secure compliance with the uptrend requirements of regulations for on-site leachate management. With a single sequential batch simulation reactor, the minimum C/N ratio was detected as 1.7 (adjusted by external carbon addition), to achieve the acceptable removal efficiency of 99, 62 and 74% in NH(4)-N, total nitrogen and chemical oxygen demand, respectively. Both total nitrogen removal and efficiency of carbon use were correlated with an increasing NO(2)(-)/NO(x)(-) ratio indicating higher performance with denitrification via nitrite. It was estimated that the leachate management cost could be reduced by 28 to 38%.

National Category
Other Environmental Engineering
Research subject
Waste Science and Technology
Identifiers
urn:nbn:se:ltu:diva-7467 (URN)10.1177/0734242X10394911 (DOI)000294436500004 ()21382875 (PubMedID)2-s2.0-80052385999 (Scopus ID)5da7ef23-e8a3-4735-863f-fae4527699bc (Local ID)5da7ef23-e8a3-4735-863f-fae4527699bc (Archive number)5da7ef23-e8a3-4735-863f-fae4527699bc (OAI)
Note

Validerad; 2011; 20110916 (andbra)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2023-05-08Bibliographically approved
Wang, Y., Pelkonen, M. & Kotro, M. (2010). Treatment of high ammonium-nitrogen wastewater from composting facilities by air stripping and catalytic oxidation (ed.). Water, Air and Soil Pollution, 208(1-4), 259-273
Open this publication in new window or tab >>Treatment of high ammonium-nitrogen wastewater from composting facilities by air stripping and catalytic oxidation
2010 (English)In: Water, Air and Soil Pollution, ISSN 0049-6979, E-ISSN 1573-2932, Vol. 208, no 1-4, p. 259-273Article in journal (Refereed) Published
Abstract [en]

Composting municipal wastewater sludge may generate composting wastewater (acid washer water and tunnel wastewater) with high ammonium-nitrogen (NH 4-N) concentration; this kind of wastewater is usually generated in a rather small daily amount. A procedure of air stripping with catalytic oxidation was developed and tested with pilot-scale and full-scale units for synthetic disposal of the high NH4-N wastewaters from composting facilities. In air stripping, around 90% NH4-N removal efficiency was reliably achieved with a maximum of 98%. A model to describe the stripping process efficiency was constructed, which can be used for process optimization. After catalytic oxidation, the concentrations in the outlet gas were acceptable for NH3, NOX, NO2, and N2O, but the NH3 and N2O concentrations limited the feasible loading range. The treatment costs were estimated in detail. The results indicate that air stripping with the catalytic oxidation process can be applied for wastewater treatment in composting facilities

National Category
Other Environmental Engineering
Research subject
Waste Science and Technology
Identifiers
urn:nbn:se:ltu:diva-8555 (URN)10.1007/s11270-009-0164-z (DOI)000276497900021 ()2-s2.0-77951768272 (Scopus ID)7118ad8b-f3f0-41f9-8c0d-49c47849039e (Local ID)7118ad8b-f3f0-41f9-8c0d-49c47849039e (Archive number)7118ad8b-f3f0-41f9-8c0d-49c47849039e (OAI)
Note
Upprättat; 2010; 20150521 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2023-05-08Bibliographically approved
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