Ghonwa Khaddour *(1), and Muhammad Manhal Al-Zoubi (2)
(1). Administration of technical affairs, General commission for scientific agricultural research, Latakia center, Syria.
(2) . Administration of natural resources research, General commission for scientific agricultural research, Damascus center, Syria.
(*Corresponding author: Ghonwa Khaddour, E-Mail: ghonwakhaddour@hotmail.com).
Received: 19/09/2022 Accepted: 16/10/2022
Abstract:
This research was conducted at the agricultural scientific research center in Latakia/ General Commission for Scientific Agricultural Research (GCSAR) in 2017/2018, to study the possibility of Olive Mill Wastewater (OMW) treatment, through the application of aerobic and anaerobic treatment techniques, in order to reduce the total phenolic content, and investigate biogas production, when anaerobic treatment is performed. The aerobic treatment included a reference (OMW without dilution and with no additives) for comparison, and three groups of experiments, in which OMW was adjusted with water by 45, 20 and 0%, and an additive was used with a 5% concentration of the mixture. Four additives were used in this work: molasses, bakery yeast, Azotobacter (AZ) and Phosphate Solubilizing Bacteria (PSB). Three replicates per addition were adopted. The results of the aerobic treatment showed a reduction in the total phenolic content, in all the experiments compared to the reference, and reached its maximum of 85% when PSB was added and with no dilution. The addition of PSB to OMW, with no dilution, was adopted for the application of anaerobic treatment. It was performed using a laboratory designed digester, and under a controlled temperature of 35 ºC. During the anaerobic treatment, it was found that on the day 21 of the experiment, biogas production has started. At the end of the treatment, in the day 47 of the experiment, it was possible to reduce the total phenolic content by 73%, and produce 3 m3/day of biogas under regular air pressure.
Key words: Olive Mills Wastewater (OMW), aerobic and anaerobic treatment, Phosphate Solubilizing Bacteria (PSB), biogas.
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