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Membranes 2018, 8(3), 52; https://doi.org/10.3390/membranes8030052

Long-Term Performance of a Full-Scale Membrane Plant for Landfill Leachate Pretreatment: A Case Study

1
Gestione Impianti Depurazione Acque SpA, via di Baciacavallo 36, 59100 Prato, Italy
2
Department of Civil and Environmental Engineering, University of Florence, via S. Marta 3, 50139 Florence, Italy
*
Author to whom correspondence should be addressed.
Received: 10 May 2018 / Revised: 9 July 2018 / Accepted: 26 July 2018 / Published: 1 August 2018
(This article belongs to the Special Issue Membrane Bioreactor (MBR) Technology for Wastewater Treatment)
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Abstract

This paper presents a case study describing a full-scale membrane bioreactor (MBR) for the pretreatment of landfill leachates. The treatment train includes an aerated equalization tank, a denitrification tank, an oxidation/nitrification tank, and two ultrafiltration units. The plant has worked continuously since 2008 treating landfill leachates at a flux of 2–11 L·h−1·m−2. The old train of membranes worked in these conditions for more than seven years prior to being damaged and replaced. The permeability (K) of the membrane varied between 30 and 80 L·h−1·m−2·bar−1 during the years of operation. In 2010, after two years of operation, the oxidation/nitrification tank was changed to work in alternate cycles of aerated and anoxic conditions, in order to improve the denitrification process. The MBR, working at a mean sludge retention time of 144 days and with mixed liquor suspended solids of 17 g/L, achieved high removal rates of conventional contaminants, with more than 98% for Biochemical Oxygen Demand, 96% for ammonium, and 75% for Chemical Oxygen Demand (COD). From the COD balance, half the COD entering was determined to be biologically oxidized into carbon dioxide, while another 24% remains in the sludge. In order to obtain these results, the company used 5.2 KWh·m−3, while spending 0.79 €·m−3. View Full-Text
Keywords: membrane; leachate; performance; industrial wastewater; full-scale; long-term membrane; leachate; performance; industrial wastewater; full-scale; long-term
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Coppini, E.; Palli, L.; Fibbi, D.; Gori, R. Long-Term Performance of a Full-Scale Membrane Plant for Landfill Leachate Pretreatment: A Case Study. Membranes 2018, 8, 52.

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