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Olive mill wastewater pretreatment by combination of filtration on olive stone filters and coagulation-flocculation.

Authors
  • Enaime, Ghizlane1
  • Baçaoui, Abdelaziz1
  • Yaacoubi, Abdelrani1
  • Wichern, Marc2
  • Lübken, Manfred2
  • 1 a Laboratory of Applied Chemistry, Unity of Methodology and Environment, Faculty of Sciences Semlalia, Cadi Ayyad University , Marrakech , Morocco. , (Morocco)
  • 2 b Institute of Urban Water Management and Environmental Engineering, Ruhr-Universität Bochum , Bochum , Germany. , (Germany)
Type
Published Article
Journal
Environmental Technology
Publisher
Informa UK (Taylor & Francis)
Publication Date
Jul 01, 2019
Volume
40
Issue
16
Pages
2135–2146
Identifiers
DOI: 10.1080/09593330.2018.1439106
PMID: 29421956
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

In the present study a new combined process, comprising filtration of raw olive mill wastewater (OMWW) on two successive olive stone (OS) filters followed by a coagulation-flocculation, was developed in order to perform an efficient pretreatment of OMWW. The results show that the use of OS filter leads to a higher removal of total suspended solids (TSS) and fatty matter (FM) from the raw OMWW (about 82.5% and 73.8%, respectively) and a depletion of total phenolic compounds (TP) and chemical oxygen demand (COD) (11.3% and 23.2%, respectively). The coagulation-flocculation was then applied to improve the removal of TP and COD from the filtered OMWW. For this purpose, a full-factorial design was used to study the effect of different factors involved in coagulation-flocculation. The studied variables were: pH (5-8), coagulant type (ferric chloride; FC and aluminum sulfate; AS), coagulant concentration (250-1000 mg/L) and flocculant (Anionique polyelectrolyte Superfloc A120 PWG) concentration (1-5 mg/L). The results reveal that the use of 250 mg/L FC and 5 mg/L flocculant at an acid pH (around 5) allows for, respectively, a removal of TP and COD of about 10.8% and 31.3%.

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