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Depuration Performance of Aerated Tanks Simulating Lagoons to Treat Olive Oil Mill Wastewater under Different Airflow Rates, and Concentrations of Polyphenols and Nitrogen

Department Agraria, Mediterranea University of Reggio Calabria, Località Feo di Vito, I-89122 Reggio Calabria, Italy
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Academic Editor: Alfredo Cassano
Received: 26 June 2021 / Revised: 19 July 2021 / Accepted: 21 July 2021 / Published: 23 July 2021
The uncontrolled disposal of olive oil mill wastewater (OMW) is hazardous for the health of water and soil, since this wastewater shows low pH and high contents of organic matter and polyphenols (PP). Lagooning is one of the most common treatment systems for agro-industrial wastewater (such as OMW), due to its low cost and easy management. Aeration allows reducing the low depuration time, which is a constraint for this system. Despite this potential feasibility, literature about OMW lagooning is not abundant. Moreover, the effects of the aeration rates, concentration of polyphenols and nitrogen shortage on depuration performance of lagoons treating OMW have not been properly explored. This study analyzes the removal rates of COD and PP, and variations of pH in OMW treated in aerated tanks at the laboratory scale simulating lagooning systems. Compared to the non-aerated tanks, aeration of OMW increased the removal rates from 61% to 90% (for COD) and from 52% to 64% (for PP). Permanent aeration was more advisable compared to intermittent flow rates. Increasing concentrations of PP noticeably reduced the COD removal rates, which were halved at a 4-fold PP concentration. In contrast, the PP removal rate was constant at every concentration experimented. Compared to the COD:N value suggested by literature for aerobic processes (100:5), a shortage in nitrogen availability reduced both COD (by about 20–25%) and PP removal rates (by 25%), the latter only when COD:N was higher 400:5. The pH was less influenced by the variations in aeration rates, PP concentration and COD:N ratio compared to COD and PP removal. This investigation provides indications about the most suitable operation parameters (airflow rates, inhibiting PP concentration, and optimal COD:N) in aerated lagooning of OMW towards environmentally sound treatments of highly polluting wastewater. View Full-Text
Keywords: aerated tanks; COD; pH; airflow rate; COD:N ratio; environmental pollution; depuration performance aerated tanks; COD; pH; airflow rate; COD:N ratio; environmental pollution; depuration performance
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MDPI and ACS Style

Andiloro, S.; Bombino, G.; Denisi, P.; Folino, A.; Zema, D.A.; Zimbone, S.M. Depuration Performance of Aerated Tanks Simulating Lagoons to Treat Olive Oil Mill Wastewater under Different Airflow Rates, and Concentrations of Polyphenols and Nitrogen. Environments 2021, 8, 70. https://0-doi-org.brum.beds.ac.uk/10.3390/environments8080070

AMA Style

Andiloro S, Bombino G, Denisi P, Folino A, Zema DA, Zimbone SM. Depuration Performance of Aerated Tanks Simulating Lagoons to Treat Olive Oil Mill Wastewater under Different Airflow Rates, and Concentrations of Polyphenols and Nitrogen. Environments. 2021; 8(8):70. https://0-doi-org.brum.beds.ac.uk/10.3390/environments8080070

Chicago/Turabian Style

Andiloro, Serafina, Giuseppe Bombino, Pietro Denisi, Adele Folino, Demetrio A. Zema, and Santo M. Zimbone 2021. "Depuration Performance of Aerated Tanks Simulating Lagoons to Treat Olive Oil Mill Wastewater under Different Airflow Rates, and Concentrations of Polyphenols and Nitrogen" Environments 8, no. 8: 70. https://0-doi-org.brum.beds.ac.uk/10.3390/environments8080070

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