Optimization of urban food waste valorization: cardboard as suitable co-substrate for dry anaerobic co-digestion
Dry anaerobic digestion is a promising option for food waste treatment and valorization.However,it is a complex process,often associated with accumulation of volatile fatty acids and ammonia nitrogen.This is translated into inefficient processes and even digestion failure.Co-digestion with cardboard may be a solution to this problem.This study focused on the effect of the initial substrate load (substrate to inoculum ratios from 0.25 to 1 gVS·gVS-1) and the initial total solids contents (20-30 %) on the performance and kinetics of dry mono-digestion of food waste and its dry co-digestion with cardboard using batch tests.All the conditions produced methane efficiently (298-464 mlCH4·gVS-1).However,volatile fatty acids accumulated initially,decreasing the pH and causing lag phases in the methane production.Interestingly,besides the high maximum free ammonia (≤ 1.17 g·kg-1) and volatile fatty acids peaks (≤ 22.6 gCOD·kg-1),methanogenesis occurred efficiently.At increasing loads of substrates,the acid accumulation was more pronounced,causing longer lag phases and lower methane yields.The addition of cardboard allowed less intense acid accumulations and smaller yields decreases at increasing loads.Centralized dry co-digestion of food waste with cardboard appears as an interesting option for valorization of these wastes in urban areas.
High-solids biomethane kinetics Gompertz
G.Capson-Tojo M.Rouez M.Crest E.Trably J.-P.Steyer J.-P.Delgenès R.Escudié
LBE, INRA, 102 avenue des Etangs, 11100, Narbonne, France;Suez, CIRSEE, 38 rue du Président Wilson, Suez, CIRSEE, 38 rue du Président Wilson, 78230, Le Pecq, France LBE, INRA, 102 avenue des Etangs, 11100, Narbonne, France
国际会议
The 15th IWA World Conference on Anaerobic Digestion( 第15届IWA世界厌氧大会)
北京
英文
133-136
2017-10-17（万方平台首次上网日期，不代表论文的发表时间）