Laboratory Investigation of Cow Manure and Digested Synergistic with Municipal Organic Solid Waste in Anaerobic Digestion Process for Efficiency Increasing

Subject Areas : Renewable Energy

Leila  yousefi ¹ (Assistant Professor of Chemistry Group, Basic Science Faculty, Islamshahr Branch, Islamic Azad University, Tehran, Iran *(Corresponding Author))
Abbas  Bahri ² (Assistant Professor of Renewable Energies Department, Niroo Research Institute, Tehran, Iran.)

Received: 2020-09-03 Accepted : 2021-01-16 Published : 2021-06-22

Keywords: Digested, Biogas, Cow manure, Anaerobic digestion, Organic solid waste,

Abstract :

Background and Objective: Increasing production rate, biogas volume and pressure, methane composition are increased efficiency. The effect of adding a mixture of cow manure (CM) and digested to municipal organic solid waste (MOSW) for increase productivity of process is considered.Method: Through three steps single MOSW, CM and digested mixing were treated by laboratory setup. Digested and CM mixing effect with MOSW were studied and evaluated by investigating of physical-chemistry properties, feed and digested elemental analysis, and also biogas pressure and volume measuring, AD time and biogas analysis.   Findings: Adding mixture of digested and CM with MOSW increases feed dry part and its carbon and nitrogen content. Transformation rate in MOSW co-digestion with digested and CM mixture (3rd step) compare to co-digestion of MOSW with digested (2rd step) and also conversion percent of mentioned quantities derived from 2rd step compare to single digestion of MOSW (1rd step) are increased. Biogas volume and pressure in base on feed mass unit and also biogas relative component, in 3rd step compare to 2rd and also in 2rd step compare to 1rd are increased.Discussion and Conclusion: Digested and CM mixing with MOSW not only contributes in increasing the organic part of the feed, but also collaborates in inoculation in process and increases the methane generation. Biogas volume and pressure and also methane production efficiency are increased. 

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