Final published version
Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Characterization of condensates from an indirect olive oil pomace drying process
T2 - the effect of drying temperature
AU - Papaioannou, E. H.
AU - Patsios, S. I.
AU - Karabelas, A. J.
AU - Philippopoulos, N. A.
PY - 2013/12
Y1 - 2013/12
N2 - Residual oil recovery from olive mill solids-containing residues (pomace) necessitates significant reduction of its water content, usually done in direct-contact dryers producing polluting vapors. An environmentally superior alternative involves pomace drying by indirect heating at modest temperatures, vapor condensation and condensate treatment for utilization or safe disposal. To develop such an integrated process, this study focuses on the condensates from pomace drying by indirect-heating at 70-120 C. These condensates exhibit fairly high concentration of organic substances, significant quantities of phenolic compounds, acidity, and low biodegradability. At the higher temperatures, local overheating of equipment surfaces, especially during the final stage of batch drying, tends to degrade condensate characteristics due to pyrolysis and/or vaporization of organic matter. At relatively low temperatures, condensates exhibit smaller concentration of organic and phenolic compounds, which entail improved biodegradability. Therefore, relatively low temperatures, combined with moderate vacuum, appear to be preferable drying conditions facilitating further condensate treatment.
AB - Residual oil recovery from olive mill solids-containing residues (pomace) necessitates significant reduction of its water content, usually done in direct-contact dryers producing polluting vapors. An environmentally superior alternative involves pomace drying by indirect heating at modest temperatures, vapor condensation and condensate treatment for utilization or safe disposal. To develop such an integrated process, this study focuses on the condensates from pomace drying by indirect-heating at 70-120 C. These condensates exhibit fairly high concentration of organic substances, significant quantities of phenolic compounds, acidity, and low biodegradability. At the higher temperatures, local overheating of equipment surfaces, especially during the final stage of batch drying, tends to degrade condensate characteristics due to pyrolysis and/or vaporization of organic matter. At relatively low temperatures, condensates exhibit smaller concentration of organic and phenolic compounds, which entail improved biodegradability. Therefore, relatively low temperatures, combined with moderate vacuum, appear to be preferable drying conditions facilitating further condensate treatment.
KW - Condensate characterization
KW - Indirect drying
KW - Olive mill residues
KW - Olive pomace
U2 - 10.1016/j.jece.2013.07.025
DO - 10.1016/j.jece.2013.07.025
M3 - Journal article
AN - SCOPUS:84888415677
VL - 1
SP - 831
EP - 837
JO - Journal of Environmental Chemical Engineering
JF - Journal of Environmental Chemical Engineering
SN - 2213-2929
IS - 4
ER -