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Ben-Gurion University of the Negev (2017)

Anaerobic digestion of goat manure : the role of different pre-treatments on its efficiency and biogas production

Al Ramahi, Mahmood

Titre : Anaerobic digestion of goat manure : the role of different pre-treatments on its efficiency and biogas production

Auteur : Al Ramahi, Mahmood,

Etablissement de soutenance : Ben-Gurion University of the Negev

Grade : Master of Science (2017)

Résumé partiel
In the Mediterranean region and specifically in Israel and the Palestinian territories goats and sheep are grown both intensively and extensively in small to medium size farms. In the Negev desert, there are about 90,000 Bedouins live in unrecognized villages and grow about 300,000 heads of sheep, camels and goats which produce about 200 tons of manure per day (Ministry of agriculture data-Israel), while the number of sheep, cows and goats in the West Bank is more than 800,000 heads (Palestinian news and info agency (WAFA) data). Of course many farms are grown in unrecognized villages which are unplanned and deprived of basic services such as electricity, running water, sewage systems and waste disposal. In these communities, the sewage is usually collected into a pit hole and spread directly to the environment with no treatment. Manure waste from small remote farms is a growing environmental challenge which often requires onsite solutions. Anaerobic digestion for reduction of waste volume, stabilization and biogas production (as energy source) is suggested and practiced in different locations. Yet, as manure is an already digested waste, its biological degradability is usually limited. Pretreatment technologies to enhance degradability and biogas production were suggested but their efficiency is debated. While goat farming is expanding, only a handful of studies have discussed its waste treatment and anaerobic digestion for biogas production in a desert environment, which is the focus of this study. More so, the study aimed to examine the effectiveness of pretreatments in enhancing digestion efficiency and biogas yield.

Specifically, the objectives were : a) Test the chemical properties of goat manure from different sites in the Negev and Jericho deserts, for determination of its suitability for AD. b) Evaluate anaerobic digestion and hydrothermal carbonization as potential goat manure treatment for recovery of energy and nutrients. Moreover, test HTC as a pretreatment technique for the anaerobic digestion of goat manure. c) Evaluate the effect of microwave radiation and mechanical grinding as pretreatment on anaerobic digestion and biogas yield for goat manure.

Présentation et version intégrale (PRIMO)

Page publiée le 17 janvier 2022