Co-digestion of cow and poultry manure will offset the effect of high concentration of ammonia in poultry litter but biogas yields are expected to be lower than predicted due to certain inhibitory effects. Infact, co-digestion of cow and poultry manure is among the most preferred options used worldwide as poultry litter is dissolved by water present in dairy manure reducing total solids contents and improving its rheological properties.

However it is necessary to determine the quantity and the maximum organic loading rate that poultry litter could be applied to a working digester treating dairy manure and straw without adversely affecting its performance. The high organic nitrogen and sulfur content of poultry litter poses a significant challenge to the gas clean up and emissions control equipment.

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About Salman Zafar

Salman Zafar is a renowned expert in waste management, renewable energy and sustainable development. He is the Founder of EcoMENA, a Doha-based organization meant to promote sustainable development and create environmental awareness in MENA countries. Salman possesses Masters degree in Chemical Engineering from Aligarh Muslim University (Aligarh, India) and has successfully accomplished a wide range of projects, mainly in the areas of biogas technology, biomass energy, waste-to-energy and solid waste management. Salman is proactively engaged in creating mass awareness on clean energy technologies and waste management systems through his websites, blogs and articles. He has participated in various international conferences as session chair, keynote speaker and panelist. Salman is a prolific writer and has authored numerous articles in reputed journals, magazines and newsletters on renewable energy and environmental issues. He is based in India and can be reached at or

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