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Pilot-plant treatment of olive mill wastewaters by Phanerochaete chrysosporium coupled to anaerobic digestion and ultrafiltration

Paper ID Volume ID Publish Year Pages File Format Full-Text
36292 45127 2006 9 PDF Available
Title
Pilot-plant treatment of olive mill wastewaters by Phanerochaete chrysosporium coupled to anaerobic digestion and ultrafiltration
Abstract

In this work, we investigated an integrated technology for the treatment of the recalcitrant contaminants of olive mill wastewaters (OMW), allowing water recovery and reuse for agricultural purposes. A pilot plant was devised based on fungal pretreatment using Phanerochaete chrysosporium followed by anaerobic digestion. P. chrysosporium DSM 6909 was cultivated on pre-stored OMW as sole carbon and energy sources in a 120 L air lift reactor (ALR) at a hydraulic retention time (HRT) of 3–5 days. The P. chrysosporium DSM 6909 pre-treated OMW was fed in a 300 L anaerobic filter after a decantation step. This anaerobic reactor worked continuously for 6 months at loading rates reaching 7 g L−1 d−1 of COD without any apparent toxicity. The P. chrysosporium DSM 6909 decreased the OMW relative toxicity from 100% to 74%. Furthermore, the P. chrysosporium DSM 6909 pre-treated OMW was well converted into methane by anaerobic digestion which resulted in an effluent with 38% toxicity referred to as untreated OMW. Moreover, the use of ultrafiltration (UF) as post-treatment technology completely detoxified the anaerobic effluent and removed its high molecular mass polyphenols. Results showed that compared to irrigation with water, treated effluent increased the germination index (GI) of Lycopersicon esculentum and enhanced plant growth while diluted untreated OMW decreased the GI and caused a pronounced growth inhibition.

Keywords
OMW, olive mill wastewaters; COD, chemical oxygen demand; ALR, air lift reactor; AF, anaerobic filter; VFA, volatile fatty acidsOlive mill wastewaters; Polyphenols; Fungi; Anaerobic digestion; Ultrafiltration; Toxicity
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Pilot-plant treatment of olive mill wastewaters by Phanerochaete chrysosporium coupled to anaerobic digestion and ultrafiltration
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Publisher
Database: Elsevier - ScienceDirect
Journal: Process Biochemistry - Volume 41, Issue 1, January 2006, Pages 159–167
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us