Energy balances, GHG emissions and related costs of municipal wastewater sludge treatment chains

Elina Merta, Mona Arnold, Ari Niemelä, Ari Kangas

Research output: Contribution to conferenceOther conference contributionScientificpeer-review

Abstract

The paper presents a case-based comparison of energy balances, green house gas emissions and costs of municipal wastewater sludge process chains based on anaerobic digestion or incineration. Several utilisation options were covered for biogas energy as well for energy from sludge incineration. The potential of enhancing anaerobic digestion by converting the process to thermophilic was studied. In addition, primary precipitation as an operation mode of a WWTP was evaluated as a possible means of enhancing the total energy efficiency. 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. Based on costs and energy balances as well as green house gas emissions it is most preferable in anaerobic digestion chains to feed the generated biogas to a gas engine to produce electricity and heat. Moreover, thermophilic anaerobic digestion can improve the overall economy of a WWTP provided that the biogas yield is sufficiently higher than in a mesophilic process.
Original languageEnglish
Number of pages15
Publication statusPublished - 2010
MoE publication typeNot Eligible
EventIWA Water and Energy Conference 2010 - Amsterdam, Netherlands
Duration: 10 Nov 201012 Nov 2010

Conference

ConferenceIWA Water and Energy Conference 2010
CountryNetherlands
CityAmsterdam
Period10/11/1012/11/10

Fingerprint

energy balance
biogas
wastewater
cost
greenhouse gas
incineration
energy efficiency
energy
electricity
sludge
anaerobic digestion
sludge treatment
sludge incineration

Keywords

  • anaerobic digestion
  • biogas
  • sludge treatment
  • sludge incineration

Cite this

Merta, E., Arnold, M., Niemelä, A., & Kangas, A. (2010). Energy balances, GHG emissions and related costs of municipal wastewater sludge treatment chains. IWA Water and Energy Conference 2010, Amsterdam, Netherlands.
Merta, Elina ; Arnold, Mona ; Niemelä, Ari ; Kangas, Ari. / Energy balances, GHG emissions and related costs of municipal wastewater sludge treatment chains. IWA Water and Energy Conference 2010, Amsterdam, Netherlands.15 p.
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abstract = "The paper presents a case-based comparison of energy balances, green house gas emissions and costs of municipal wastewater sludge process chains based on anaerobic digestion or incineration. Several utilisation options were covered for biogas energy as well for energy from sludge incineration. The potential of enhancing anaerobic digestion by converting the process to thermophilic was studied. In addition, primary precipitation as an operation mode of a WWTP was evaluated as a possible means of enhancing the total energy efficiency. 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. Based on costs and energy balances as well as green house gas emissions it is most preferable in anaerobic digestion chains to feed the generated biogas to a gas engine to produce electricity and heat. Moreover, thermophilic anaerobic digestion can improve the overall economy of a WWTP provided that the biogas yield is sufficiently higher than in a mesophilic process.",
keywords = "anaerobic digestion, biogas, sludge treatment, sludge incineration",
author = "Elina Merta and Mona Arnold and Ari Niemel{\"a} and Ari Kangas",
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Merta, E, Arnold, M, Niemelä, A & Kangas, A 2010, 'Energy balances, GHG emissions and related costs of municipal wastewater sludge treatment chains' IWA Water and Energy Conference 2010, Amsterdam, Netherlands, 10/11/10 - 12/11/10, .

Energy balances, GHG emissions and related costs of municipal wastewater sludge treatment chains. / Merta, Elina; Arnold, Mona; Niemelä, Ari; Kangas, Ari.

2010. IWA Water and Energy Conference 2010, Amsterdam, Netherlands.

Research output: Contribution to conferenceOther conference contributionScientificpeer-review

TY - CONF

T1 - Energy balances, GHG emissions and related costs of municipal wastewater sludge treatment chains

AU - Merta, Elina

AU - Arnold, Mona

AU - Niemelä, Ari

AU - Kangas, Ari

N1 - Project code: 30875

PY - 2010

Y1 - 2010

N2 - The paper presents a case-based comparison of energy balances, green house gas emissions and costs of municipal wastewater sludge process chains based on anaerobic digestion or incineration. Several utilisation options were covered for biogas energy as well for energy from sludge incineration. The potential of enhancing anaerobic digestion by converting the process to thermophilic was studied. In addition, primary precipitation as an operation mode of a WWTP was evaluated as a possible means of enhancing the total energy efficiency. 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. Based on costs and energy balances as well as green house gas emissions it is most preferable in anaerobic digestion chains to feed the generated biogas to a gas engine to produce electricity and heat. Moreover, thermophilic anaerobic digestion can improve the overall 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, green house gas emissions and costs of municipal wastewater sludge process chains based on anaerobic digestion or incineration. Several utilisation options were covered for biogas energy as well for energy from sludge incineration. The potential of enhancing anaerobic digestion by converting the process to thermophilic was studied. In addition, primary precipitation as an operation mode of a WWTP was evaluated as a possible means of enhancing the total energy efficiency. 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. Based on costs and energy balances as well as green house gas emissions it is most preferable in anaerobic digestion chains to feed the generated biogas to a gas engine to produce electricity and heat. Moreover, thermophilic anaerobic digestion can improve the overall economy of a WWTP provided that the biogas yield is sufficiently higher than in a mesophilic process.

KW - anaerobic digestion

KW - biogas

KW - sludge treatment

KW - sludge incineration

M3 - Other conference contribution

ER -

Merta E, Arnold M, Niemelä A, Kangas A. Energy balances, GHG emissions and related costs of municipal wastewater sludge treatment chains. 2010. IWA Water and Energy Conference 2010, Amsterdam, Netherlands.