High-solid anaerobic digestion of sewage sludge under mesophilic conditions: Feasibility study

► The first study on the feasibility of anaerobic digestion of dewatered sludge. ► The first study providing process parameters for dry anaerobic digestion of sludge. ► The TS of the feeding sludge for digestion was much higher than that in other reports. ► High-solid system could support an OLR 4-6 times as high as that of low-solid system. ► VFA/TA ratio was not suitable in predicting stability in ammonia inhibited system.