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A range of total solids from 4.5% to 19.2% is considered in order to compare methane yields and kinetics of reactors operated under wet to dry conditions. The experimental results show a reduction of the specific final methane yield of 4.3% and 40.8% in semi-dry and dry conditions compared with wet conditions. A decreasing trend of the specific initial methane production rate is observed when increasing the total solids concentration. Because of lack of water, volatile fatty acids accumulation occurs during the first step of the process at semi-dry and dry conditions, which is considered to be responsible for the reduction of process kinetic rates. The total volatile fatty acids concentration and speciation are proposed as indicators of process development at different total solids content.<\/jats:p>","DOI":"10.1177\/0734242x14550740","type":"journal-article","created":{"date-parts":[[2014,10,4]],"date-time":"2014-10-04T00:17:05Z","timestamp":1412381825000},"page":"947-953","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":39,"title":["Effect of total solids content on methane and volatile fatty acid production in anaerobic digestion of food waste"],"prefix":"10.1177","volume":"32","author":[{"given":"Flavia","family":"Liotta","sequence":"first","affiliation":[{"name":"Department of Civil and Mechanical Engineering, University of Cassino and the Southern Lazio, Cassino, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Giuseppe","family":"d\u2019Antonio","sequence":"additional","affiliation":[{"name":"Department of Civil, Architectural and 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