Abstract

Anaerobic co-digestion (AcoD) is more advantageous than conventional mono-digestion, because of higher gas production rate. This study was aimed to study the effect of mixture ratio in codigestion of manure and source separated organics (SSO) in mesophilic condition. Manure and SSO at different mixture ratios of 9:1, 7:3, 5:5, 3:7, and 1:9 on a volumetric basis were used to determine the effect of the mixture ratios on methane production in biomethane potential assay (BMP). Results showed that co-digestion of SSO and manure at the ratio of 1:9 (V/V) resulted in the highest biomethane production rate of 46 mL CH4 /day. In comparison, the maximum methane production rate for anaerobic digestion of manure alone was 43 mL CH4 /day. When manure is mixed with SSO at a ratio of 5:5, about 15% higher cumulative methane production has been achieved. This research also verified the advantages of co-digestion over mono-digestion. Keywords: Anaerobic Digestion, Co-digestion, Source Separated Organics (SSO), Manure

Highlights

  • Nowadays many countries facing the most crucial problems for the disposal of many types of wastes like Municipal Solid Waste (MSW), Sewage Sludge (SS), Dairy Manure (DM) and crop residues

  • This study provided the information about different parameters for each types of digester which is summarized in Table-2

  • The maximum methane yield of about 150 mLCH4/g TCOD added was observed for the manure and Source Separated Organics (SSO) ratio of 9:1

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Summary

Introduction

Nowadays many countries facing the most crucial problems for the disposal of many types of wastes like Municipal Solid Waste (MSW), Sewage Sludge (SS), Dairy Manure (DM) and crop residues. There are different types of methods available for the proper disposal and recycling of these kind of wastes Among all these methods, Anaerobic Digestion (AD) is one of the most successful method because of its minimum impact on the environment. Anaerobic digestion is a natural biological process In this process anaerobic microbes break down the organic matters of the waste, release the gas and leave the non-biodegradable waste as a residue. This whole process operated in a closed reactor known as a ‘Digester’, in the absence of oxygen (O2) with elevated temperature. Biogas typically contains 60% to 70% methane (by volume), 30% to 40% carbon dioxide and minor quantities of nitrogen, hydrogen, ammonia and hydrogen sulfide (usually less than 1% of the total gas volume).

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