Informations et ressources scientifiques
sur le développement des zones arides et semi-arides

Accueil du site → Master → Pays Bas → 2016 → Treatment of olive mill wastewater in an upflow anaerobic sludge blanket (UASB) reactor

UNESCO-IHE Institute for Water Education, Delft (2016)

Treatment of olive mill wastewater in an upflow anaerobic sludge blanket (UASB) reactor

Assefa, F.

Titre : Treatment of olive mill wastewater in an upflow anaerobic sludge blanket (UASB) reactor

Auteur : Assefa, F.

Université de soutenance : UNESCO-IHE Institute for Water Education, Delft

Grade : Master of Science (MS) 2016

Résumé partiel
Anaerobic treatment of olive mill wastes (OMW) has gained significant attention in the Mediterranean and Palestine region due to demand for energy and cost-effective environmental protection. However, OMW harbours high concentration of toxic phenolic compounds that can affect the anaerobic treatment. In this study, different approaches were undertaken in order to limit the inhibition caused by phenol in OMW for improved anaerobic degradation and good quality biogas production. For this purpose, two lab-scale upflow anaerobic sludge blanket (UASB) reactors were used to treat synthetically prepared OMW. Biomass acclimation to phenol was used as a strategy to increase phenol degradation rates and to develop biomass that has high tolerance towards phenol toxicity. Acclimation was performed in two ways, in the first reactor (R1), biomass adaptation to phenol was performed at phenol loading rate of 2.4 g PCOD/L d for a longer period of time and the performance of the sludge was tested under different phenol loading rates (PLR).In the second reactor (R2), step feeding of phenol was started from low PLR of 0.72 g PCOD/L d and gradual increased to 2.4 g PCOD/L d. The possible use of activated carbon (AC) to enhance OMW anaerobic digestion by limiting phenol inhibition was also studied. The extent of phenol inhibition was also tested in batch conditions using Automatic Methane Potential Test System (AMPTS). Different parameters including chemical oxygen demand (COD), volatile fatty acid (VFA), phenol concentration, pH, total suspended solids (TSS) and volatile suspended solids (VSS) were monitored, both at the influent and effluent. Methane production and its composition were also measured on a daily basis. Toxicity of phenol in treating OMW was tested in a batch reactors using nonadapted sludge, biomass fed with OMW without phenol and phenol adapted sludge. Results from AMPTS showed that the total methane production was a strong function of the initial phenol (500 mg/L, 1000 mg/L, 1500 mg/L, 2000 mg/L, and 4000 mg/L) concentration. Low phenol contents enhanced methane production rates while high phenol concentrations inhibited the biogas production. In the case of the UASB reactors, the biomass adapted to phenol showed good potential to treat OMW containing phenol.

Sujets  : anaerobic treatment wastewater activated carbon anaerobic sludge phenols

Présentation

Page publiée le 21 décembre 2019