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Co-digestion of organic solid waste and sludge from sewage treatment

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Title: Co-digestion of organic solid waste and sludge from sewage treatment
Authors: Edelmann, W., Engeli, H., Gradenecker, M.
Source: Water Science & Technology. 2000, Vol. 41 Issue 3, p213. 0p.
Subjects: Agriculture, Sewage purification, Sewage sludge, Municipal solid waste incinerator residues, Biogas production
Abstract: Solid organic wastes were codigested together with sludge of a sewage treatment plant (STP). In the practical part of the study, a plant to pretreat the organic solid wastes provided by local super markets was constructed at the STP of Frutigen, Switzerland. Up to more than 1 cubic metre of wastes was added to the fermenter of the STP every day. Data collected during 14 months of practical works, showed that for raw fruit and vegetable wastes a two step pretreatment is necessary: First the wastes were chopped and afterwards reduced to a size of 1-2 millimetres, in order to get a homogeneous suspension together with the primary sludge. The vegetable wastes showed excellent digestibility: They seemed to accelerate the digestion process as well as to increase the degree of the anaerobic degradation of the sludge. The energy demand for both, pretreatment and digestion, was 85 kWh/ton of fresh wastes. 20% of the energy was used for the hygienization, a step which does not seem to be necessary for this kind of waste in most of the cases, however. After using the gas for energy conversion, a net yield of 65 kWh/ton of electricity and 166 kWh/ton of heat was measured. Treating cooked kitchen wastes, the net energy production willbe higher, because in this case a one step pretreatment will be sufficient. The pretreatment and treatment costs for codigestion on STP'swere calculated to be in the range of 55 US$/ton treating half a tonper day and 39 US$/ton treating one ton, respectively. A theoreticalfeasibility study showed that in Switzerland there is a short term potential on STP's for the codigestion of about 120,000 tons of biogenic wastes per year without big investments. Economic studies about codigestion on agricultural biogas plants showed that the codigestion is a must at the current energy prices, which are far too low for agricultural AD without an additional income by treating solid wastes forthird parties. [ABSTRACT FROM AUTHOR]
Copyright of Water Science & Technology is the property of IWA Publishing and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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  Data: Co-digestion of organic solid waste and sludge from sewage treatment
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  Data: <searchLink fieldCode="AR" term="%22Edelmann%2C+W%2E%22">Edelmann, W.</searchLink><br /><searchLink fieldCode="AR" term="%22Engeli%2C+H%2E%22">Engeli, H.</searchLink><br /><searchLink fieldCode="AR" term="%22Gradenecker%2C+M%2E%22">Gradenecker, M.</searchLink>
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  Data: <searchLink fieldCode="JN" term="%22Water+Science+%26+Technology%22">Water Science & Technology</searchLink>. 2000, Vol. 41 Issue 3, p213. 0p.
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  Data: <searchLink fieldCode="DE" term="%22Agriculture%22">Agriculture</searchLink><br /><searchLink fieldCode="DE" term="%22Sewage+purification%22">Sewage purification</searchLink><br /><searchLink fieldCode="DE" term="%22Sewage+sludge%22">Sewage sludge</searchLink><br /><searchLink fieldCode="DE" term="%22Municipal+solid+waste+incinerator+residues%22">Municipal solid waste incinerator residues</searchLink><br /><searchLink fieldCode="DE" term="%22Biogas+production%22">Biogas production</searchLink>
– Name: Abstract
  Label: Abstract
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  Data: Solid organic wastes were codigested together with sludge of a sewage treatment plant (STP). In the practical part of the study, a plant to pretreat the organic solid wastes provided by local super markets was constructed at the STP of Frutigen, Switzerland. Up to more than 1 cubic metre of wastes was added to the fermenter of the STP every day. Data collected during 14 months of practical works, showed that for raw fruit and vegetable wastes a two step pretreatment is necessary: First the wastes were chopped and afterwards reduced to a size of 1-2 millimetres, in order to get a homogeneous suspension together with the primary sludge. The vegetable wastes showed excellent digestibility: They seemed to accelerate the digestion process as well as to increase the degree of the anaerobic degradation of the sludge. The energy demand for both, pretreatment and digestion, was 85 kWh/ton of fresh wastes. 20% of the energy was used for the hygienization, a step which does not seem to be necessary for this kind of waste in most of the cases, however. After using the gas for energy conversion, a net yield of 65 kWh/ton of electricity and 166 kWh/ton of heat was measured. Treating cooked kitchen wastes, the net energy production willbe higher, because in this case a one step pretreatment will be sufficient. The pretreatment and treatment costs for codigestion on STP'swere calculated to be in the range of 55 US$/ton treating half a tonper day and 39 US$/ton treating one ton, respectively. A theoreticalfeasibility study showed that in Switzerland there is a short term potential on STP's for the codigestion of about 120,000 tons of biogenic wastes per year without big investments. Economic studies about codigestion on agricultural biogas plants showed that the codigestion is a must at the current energy prices, which are far too low for agricultural AD without an additional income by treating solid wastes forthird parties. [ABSTRACT FROM AUTHOR]
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  Label:
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  Data: <i>Copyright of Water Science & Technology is the property of IWA Publishing and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.2166/wst.2000.0074
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      – Code: eng
        Text: English
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        PageCount: 0
        StartPage: 213
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      – SubjectFull: Agriculture
        Type: general
      – SubjectFull: Sewage purification
        Type: general
      – SubjectFull: Sewage sludge
        Type: general
      – SubjectFull: Municipal solid waste incinerator residues
        Type: general
      – SubjectFull: Biogas production
        Type: general
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      – TitleFull: Co-digestion of organic solid waste and sludge from sewage treatment
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            NameFull: Engeli, H.
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              Text: 2000
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