Optimised energy recovery from wastewater sludge

Elina Merta, Mona Arnold

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

Abstract

The paper presents a case-based comparison of energy balances and costs of municipal wastewater sludge process chains based on anaerobic digestion or incineration. In chains based on anaerobic digestion, several biogas utilisation options were studied. In addition, the potential of enhancing anaerobic digestion e.g. by converting the process to thermophilic was studied. Based on the results, sludge incineration was the most expensive option of the studied scenarios, but justified if the heat generated can be utilised in district heating. However, the electricity balances in both incineration and anaerobic digestion are close to one another. If anaerobic digestion is used, both from an economical and energy point of view, the best option is to feed the generated biogas to a gas engine to produce electricity and heat. Based on the calculations, thermophilic anaerobic digestion can improve the economy of a WWTP provided that the biogas yield is sufficiently higher than in a mesophilic process.
Original languageEnglish
Title of host publicationProceedings
Subtitle of host publicationThird International Symposium on Energy from Biomass and Waste, Venice 2010
PublisherCisa Publisher
ISBN (Print)978-8-8626-5008-3
Publication statusPublished - 2010
MoE publication typeA4 Article in a conference publication
EventThird International Symposium on Energy from Biomass and Waste, Venice 2010 - Venice , Italy
Duration: 8 Nov 201011 Nov 2010

Conference

ConferenceThird International Symposium on Energy from Biomass and Waste, Venice 2010
Abbreviated titleVenice 2010
CountryItaly
CityVenice
Period8/11/1011/11/10

Fingerprint

Anaerobic digestion
Wastewater
Recovery
Biogas
Waste incineration
Electricity
Gas engines
Incineration
District heating
Energy balance
Costs

Keywords

  • anaerobic digestion
  • biogas
  • sludge treatment
  • sludge incineration

Cite this

Merta, E., & Arnold, M. (2010). Optimised energy recovery from wastewater sludge. In Proceedings: Third International Symposium on Energy from Biomass and Waste, Venice 2010 Cisa Publisher.
Merta, Elina ; Arnold, Mona. / Optimised energy recovery from wastewater sludge. Proceedings: Third International Symposium on Energy from Biomass and Waste, Venice 2010. Cisa Publisher, 2010.
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Merta, E & Arnold, M 2010, Optimised energy recovery from wastewater sludge. in Proceedings: Third International Symposium on Energy from Biomass and Waste, Venice 2010. Cisa Publisher, Third International Symposium on Energy from Biomass and Waste, Venice 2010 , Venice , Italy, 8/11/10.

Optimised energy recovery from wastewater sludge. / Merta, Elina; Arnold, Mona.

Proceedings: Third International Symposium on Energy from Biomass and Waste, Venice 2010. Cisa Publisher, 2010.

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

TY - GEN

T1 - Optimised energy recovery from wastewater sludge

AU - Merta, Elina

AU - Arnold, Mona

N1 - Project code: 30875

PY - 2010

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N2 - The paper presents a case-based comparison of energy balances and costs of municipal wastewater sludge process chains based on anaerobic digestion or incineration. In chains based on anaerobic digestion, several biogas utilisation options were studied. In addition, the potential of enhancing anaerobic digestion e.g. by converting the process to thermophilic was studied. Based on the results, sludge incineration was the most expensive option of the studied scenarios, but justified if the heat generated can be utilised in district heating. However, the electricity balances in both incineration and anaerobic digestion are close to one another. If anaerobic digestion is used, both from an economical and energy point of view, the best option is to feed the generated biogas to a gas engine to produce electricity and heat. Based on the calculations, thermophilic anaerobic digestion can improve the economy of a WWTP provided that the biogas yield is sufficiently higher than in a mesophilic process.

AB - The paper presents a case-based comparison of energy balances and costs of municipal wastewater sludge process chains based on anaerobic digestion or incineration. In chains based on anaerobic digestion, several biogas utilisation options were studied. In addition, the potential of enhancing anaerobic digestion e.g. by converting the process to thermophilic was studied. Based on the results, sludge incineration was the most expensive option of the studied scenarios, but justified if the heat generated can be utilised in district heating. However, the electricity balances in both incineration and anaerobic digestion are close to one another. If anaerobic digestion is used, both from an economical and energy point of view, the best option is to feed the generated biogas to a gas engine to produce electricity and heat. Based on the calculations, thermophilic anaerobic digestion can improve the economy of a WWTP provided that the biogas yield is sufficiently higher than in a mesophilic process.

KW - anaerobic digestion

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KW - sludge treatment

KW - sludge incineration

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Merta E, Arnold M. Optimised energy recovery from wastewater sludge. In Proceedings: Third International Symposium on Energy from Biomass and Waste, Venice 2010. Cisa Publisher. 2010