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The co-digestion of biosolids and organic fraction of municipal solid waste was compared with the direct digestion of biosolids. Addition of organic fraction of municipal solid waste improved carbon-to-nitrogen (C/N) ratio from 8.10 to 17.68 or 20.55 in the feedstock, and led to a higher volatile fatty acid (VFA) concentration of about 1500 mg/L in the solution and a lower solution pH under 6 in the...
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