Title: Batch and semi-continuous anaerobic codigestion of Olive mill wastewaters and diluted poultry manure: a laboratory scale optimal ratio evaluation

Authors: Imane Qarraey; Abd-Essamad Moujanni; Aaziz Ouatmane

Addresses: Department of Biology, Sciences and Technology, Faculty Sultane Moulay Slimane University, Box 523 Beni Mellal, Morocco ' Department of Biology, Sciences and Technology, Faculty Sultane Moulay Slimane University, Box 523 Beni Mellal, Morocco ' Department of Biology, Sciences and Technology, Faculty Sultane Moulay Slimane University, Box 523 Beni Mellal, Morocco

Abstract: The anaerobic codigestion of olive mill wastewater (OMWW) and poultry manure (PM) was investigated in order to determine the appropriate mixture ratio with a focus on total and OMWW organic load contribution. Codigestion was first explored through batch tests using a combination of four PM dry basis ratios (1 to 4%) and four volumetric OMWW ratios (0 to 15%). Thereafter, codigestion was attempted at semi-continuous mode, at batch identified appropriate PM ratio, using a gradual OMWW increase up to 20%. Results showed that the maximum BMP was recorded with PM monodigestion with biogas peak of 410.48 mL/gVS at 5.38 gVS/L. Under the semi-continuous conditions, increasing OMWW fed ratio improved biogas yield up to total feed of 1.57 gVS/L.d achieving a maximum production of 215.85 ± 23.56 mL/gVS.d. The codigestion of OMWW and PM was possible up to a critical OMWW VS contribution of 40% to 50%.

Keywords: anaerobic codigestion; biogas; OMWW; optimal mixture; poultry manure.

DOI: 10.1504/IJEWM.2024.135920

International Journal of Environment and Waste Management, 2024 Vol.33 No.1, pp.1 - 13

Received: 19 Sep 2020
Accepted: 29 Jun 2021
Published online: 09 Jan 2024 *

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