Sokrat Ahmad*⁽¹⁾  Muhamad Manhal Alzoubi ⁽²⁾  and Issa Kbaybu ⁽¹⁾

(1) Soil and Water Science Department, Agriculture Faculty, Tishreen University, Lattakia, Syria.

(2) Natural Resources Administration, General Commission for Scientific Agricultural Research (GCSAR),Damascus, Syria.

(*Corresponding author: Sokrat Ahmad, E-mail: Socrates.82.sy@gmail.com)

Received:  25/08/2021                   Accepted: 4/11/ 2021

Abstract: 

Biogas technology mainly depends on Anaerobic digestion of organic wastes. It is considered one of the most spread technologies worldwide to treat the agro-residues in an economical and effective way. Moreover, it protects the environment from pollution and produce Methane gas as a renewable source of energy as well as the production of biogas fertilizer (digestate). Anaerobic co-digestion experiment was conducted of olive mill wastewater with cattle manure at a ratio of (60:40) using the digester located at Zahid Research Station for organic farming in Tartous Governorate. The aim was to minimize the adverse effects of OMWW on the environment, measuring the amount of produced biogas, and to evaluate the biogas fertilizer leftover at the end of the digestion process. There was a delay in biogas production due to the decrease in the pH of the fermentation solution at the beginning of the digestion process and to the acidic nature of the OMWW. After 15 days of feeding the digester, the biogas started to release and continued for 45 days, and the total production reached 195.4 m³ at a constant pressure of 0.02 bar. The results of the digestate analysis at the end of the digestion process showed a decrease of organic matter percentage and increase of pH compared to the organic wastes used in addition to good amounts of macro and micro nutrients. This study proves that mixing of OMWW with cattle manure is promising in enhancing biogas production and removing high organic load of OMWW.

Kew wards: Anaerobic digestion, Olive Mill Wastewater, Biogas, Digestate.

Full paper in Arabic: pdf