An integrated process of olive mill wastewater treatment

E. I. El-Shafey, P. F.M. Correia, J. M.R. De Carvalho

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

Olive mill wastewater (OMWW) is considered as a challenge for environmental scientists. It is characterized by high values of total organics expressed by chemical oxygen demand (COD), biological oxygen demand (BOD 5 ), and phenols. In this paper, an integrated process of OMWW treatment, which includes lime precipitation, filtration using a novel technology of a membrane filter press (a pilot scale) and a posttreatment using activated carbon adsorption for the filtrate, was studied. Lime precipitation has removed 71% of phenols, 39% of COD, and 88% of BOD 5 with a rise in the total suspended solids (TSS) from 31 kg/m 3 (before precipitation) to 69 kg/m 3 (after precipitation). The filtration and dewatering operation cycle is approximately 125-150 min. Filtration was examined at different feed pressure (3-5 bar), different slurry concentrations (23-69 kg/m 3 , dry weight), and filter aid precoat with different additions of diatomite body feed. Specific cake resistance, , was found to increase with the increase in feed pressure and to decrease with diatomite precoating and slurry concentration increase. However, a further decrease in values was obtained using diatomite body feed. Cake dewatering, via membrane squeezing, was applied using hot water (65°C) and cake moisture was dropped from 64% before squeezing to 35% after squeezing. Twenty minutes were found enough for that stage to be accomplished. With vacuum application, for 30 min, over the hot cakes, cake moisture decreased to 20% for cakes with an average thickness of 1 cm. The produced cakes lose more moisture by storing in open air (on the shelf), reaching an equilibrium value of 9% in 2-3 days. Calorific value of produced cake is 15.71 MJ/kg, suggesting strongly its use as an energy source. Activated carbon was used as an efficient sorbent for removing the remaining phenols and total organics from the filtrate as a posttreatment showing promising results. Maximum removal of phenols and total organics, by lime precipitation and filtrate posttreatment using activated carbon adsorption, reached 99.7% and 80%, respectively. A process flowsheet and preliminary cost estimates are presented and compared with other processes. The thermal energy produced by the burning of the produced cakes would be enough for the thermal needs of both the olive mill plant and the proposed treatment process.

Original languageEnglish
Pages (from-to)2841-2869
Number of pages29
JournalSeparation Science and Technology
Volume40
Issue number14
DOIs
Publication statusPublished - Oct 2005

Fingerprint

Phenols
Wastewater treatment
Biochemical oxygen demand
Lime
Activated carbon
Moisture
Chemical oxygen demand
Dewatering
Vacuum applications
Membranes
Adsorption
Calorific value
Flowcharting
Sorbents
Thermal energy
Wastewater
Water
Air
lime
diatomite

Keywords

  • Activated carbon
  • Cake
  • Lime
  • Membrane filter press
  • Olive mill wastewater

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Process Chemistry and Technology
  • Filtration and Separation

Cite this

An integrated process of olive mill wastewater treatment. / El-Shafey, E. I.; Correia, P. F.M.; De Carvalho, J. M.R.

In: Separation Science and Technology, Vol. 40, No. 14, 10.2005, p. 2841-2869.

Research output: Contribution to journalArticle

El-Shafey, E. I. ; Correia, P. F.M. ; De Carvalho, J. M.R. / An integrated process of olive mill wastewater treatment. In: Separation Science and Technology. 2005 ; Vol. 40, No. 14. pp. 2841-2869.
@article{da3ba9ae15204a2ab1c8a6d07f8b06ec,
title = "An integrated process of olive mill wastewater treatment",
abstract = "Olive mill wastewater (OMWW) is considered as a challenge for environmental scientists. It is characterized by high values of total organics expressed by chemical oxygen demand (COD), biological oxygen demand (BOD 5 ), and phenols. In this paper, an integrated process of OMWW treatment, which includes lime precipitation, filtration using a novel technology of a membrane filter press (a pilot scale) and a posttreatment using activated carbon adsorption for the filtrate, was studied. Lime precipitation has removed 71{\%} of phenols, 39{\%} of COD, and 88{\%} of BOD 5 with a rise in the total suspended solids (TSS) from 31 kg/m 3 (before precipitation) to 69 kg/m 3 (after precipitation). The filtration and dewatering operation cycle is approximately 125-150 min. Filtration was examined at different feed pressure (3-5 bar), different slurry concentrations (23-69 kg/m 3 , dry weight), and filter aid precoat with different additions of diatomite body feed. Specific cake resistance, , was found to increase with the increase in feed pressure and to decrease with diatomite precoating and slurry concentration increase. However, a further decrease in values was obtained using diatomite body feed. Cake dewatering, via membrane squeezing, was applied using hot water (65°C) and cake moisture was dropped from 64{\%} before squeezing to 35{\%} after squeezing. Twenty minutes were found enough for that stage to be accomplished. With vacuum application, for 30 min, over the hot cakes, cake moisture decreased to 20{\%} for cakes with an average thickness of 1 cm. The produced cakes lose more moisture by storing in open air (on the shelf), reaching an equilibrium value of 9{\%} in 2-3 days. Calorific value of produced cake is 15.71 MJ/kg, suggesting strongly its use as an energy source. Activated carbon was used as an efficient sorbent for removing the remaining phenols and total organics from the filtrate as a posttreatment showing promising results. Maximum removal of phenols and total organics, by lime precipitation and filtrate posttreatment using activated carbon adsorption, reached 99.7{\%} and 80{\%}, respectively. A process flowsheet and preliminary cost estimates are presented and compared with other processes. The thermal energy produced by the burning of the produced cakes would be enough for the thermal needs of both the olive mill plant and the proposed treatment process.",
keywords = "Activated carbon, Cake, Lime, Membrane filter press, Olive mill wastewater",
author = "El-Shafey, {E. I.} and Correia, {P. F.M.} and {De Carvalho}, {J. M.R.}",
year = "2005",
month = "10",
doi = "10.1080/01496390500333152",
language = "English",
volume = "40",
pages = "2841--2869",
journal = "Separation Science and Technology",
issn = "0149-6395",
publisher = "Taylor and Francis Ltd.",
number = "14",

}

TY - JOUR

T1 - An integrated process of olive mill wastewater treatment

AU - El-Shafey, E. I.

AU - Correia, P. F.M.

AU - De Carvalho, J. M.R.

PY - 2005/10

Y1 - 2005/10

N2 - Olive mill wastewater (OMWW) is considered as a challenge for environmental scientists. It is characterized by high values of total organics expressed by chemical oxygen demand (COD), biological oxygen demand (BOD 5 ), and phenols. In this paper, an integrated process of OMWW treatment, which includes lime precipitation, filtration using a novel technology of a membrane filter press (a pilot scale) and a posttreatment using activated carbon adsorption for the filtrate, was studied. Lime precipitation has removed 71% of phenols, 39% of COD, and 88% of BOD 5 with a rise in the total suspended solids (TSS) from 31 kg/m 3 (before precipitation) to 69 kg/m 3 (after precipitation). The filtration and dewatering operation cycle is approximately 125-150 min. Filtration was examined at different feed pressure (3-5 bar), different slurry concentrations (23-69 kg/m 3 , dry weight), and filter aid precoat with different additions of diatomite body feed. Specific cake resistance, , was found to increase with the increase in feed pressure and to decrease with diatomite precoating and slurry concentration increase. However, a further decrease in values was obtained using diatomite body feed. Cake dewatering, via membrane squeezing, was applied using hot water (65°C) and cake moisture was dropped from 64% before squeezing to 35% after squeezing. Twenty minutes were found enough for that stage to be accomplished. With vacuum application, for 30 min, over the hot cakes, cake moisture decreased to 20% for cakes with an average thickness of 1 cm. The produced cakes lose more moisture by storing in open air (on the shelf), reaching an equilibrium value of 9% in 2-3 days. Calorific value of produced cake is 15.71 MJ/kg, suggesting strongly its use as an energy source. Activated carbon was used as an efficient sorbent for removing the remaining phenols and total organics from the filtrate as a posttreatment showing promising results. Maximum removal of phenols and total organics, by lime precipitation and filtrate posttreatment using activated carbon adsorption, reached 99.7% and 80%, respectively. A process flowsheet and preliminary cost estimates are presented and compared with other processes. The thermal energy produced by the burning of the produced cakes would be enough for the thermal needs of both the olive mill plant and the proposed treatment process.

AB - Olive mill wastewater (OMWW) is considered as a challenge for environmental scientists. It is characterized by high values of total organics expressed by chemical oxygen demand (COD), biological oxygen demand (BOD 5 ), and phenols. In this paper, an integrated process of OMWW treatment, which includes lime precipitation, filtration using a novel technology of a membrane filter press (a pilot scale) and a posttreatment using activated carbon adsorption for the filtrate, was studied. Lime precipitation has removed 71% of phenols, 39% of COD, and 88% of BOD 5 with a rise in the total suspended solids (TSS) from 31 kg/m 3 (before precipitation) to 69 kg/m 3 (after precipitation). The filtration and dewatering operation cycle is approximately 125-150 min. Filtration was examined at different feed pressure (3-5 bar), different slurry concentrations (23-69 kg/m 3 , dry weight), and filter aid precoat with different additions of diatomite body feed. Specific cake resistance, , was found to increase with the increase in feed pressure and to decrease with diatomite precoating and slurry concentration increase. However, a further decrease in values was obtained using diatomite body feed. Cake dewatering, via membrane squeezing, was applied using hot water (65°C) and cake moisture was dropped from 64% before squeezing to 35% after squeezing. Twenty minutes were found enough for that stage to be accomplished. With vacuum application, for 30 min, over the hot cakes, cake moisture decreased to 20% for cakes with an average thickness of 1 cm. The produced cakes lose more moisture by storing in open air (on the shelf), reaching an equilibrium value of 9% in 2-3 days. Calorific value of produced cake is 15.71 MJ/kg, suggesting strongly its use as an energy source. Activated carbon was used as an efficient sorbent for removing the remaining phenols and total organics from the filtrate as a posttreatment showing promising results. Maximum removal of phenols and total organics, by lime precipitation and filtrate posttreatment using activated carbon adsorption, reached 99.7% and 80%, respectively. A process flowsheet and preliminary cost estimates are presented and compared with other processes. The thermal energy produced by the burning of the produced cakes would be enough for the thermal needs of both the olive mill plant and the proposed treatment process.

KW - Activated carbon

KW - Cake

KW - Lime

KW - Membrane filter press

KW - Olive mill wastewater

UR - http://www.scopus.com/inward/record.url?scp=29744470429&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=29744470429&partnerID=8YFLogxK

U2 - 10.1080/01496390500333152

DO - 10.1080/01496390500333152

M3 - Article

VL - 40

SP - 2841

EP - 2869

JO - Separation Science and Technology

JF - Separation Science and Technology

SN - 0149-6395

IS - 14

ER -