How a two-day hydrolysis step improves the methane production rate in a TPAD reactor
The influence of retention time and temperature on the hydrolytic stage of a high solids temperature phased anaerobic digestion system (TPAD) was investigated.The substrate was composed of cattle slurry and maize silage at different ratio (100,70 and 30 % cattle slurry on VS basis) at constant total solids content of 12.8 %.It was incubated during 48h at 37,55,65 and 72 ℃ in order to simulate the hydrolytic stage ofa TPAD.COD solubilisation and BMP were measured at 0,24 and 48 h.The increase of temperature enhanced the amount of COD in the soluble phase.The influence of temperature on solubilization was thus in line with previously reported data,as higher temperatures brought fast higher COD turned into soluble form.Most of the solubilization took place in the first 24h of the hydrolytic stage The most interesting result was that the kinetics of methane production in post-hydrolysis (evaluated by a BMP test) was greatly influenced by the hydrolysis time: no remarkable effect after 24h were noticed,but the kinetics of methane production was greatly enhanced after 48h (1 st order kinetic coefficient increased by ±86% on average).This effect was observed for the whole range of temperature tested.Surprisingly,no correlation was observed between the extent of solubilization and the improvement of the methane production kinetics.The behaviour of the particulate fraction of the sample was similar to that of the whole sample regarding this kinetics.Meanwhile,the intrinsic value of the BMP was not significantly modified by the hydrolysis stage.
Temperature phased anaerobic reactor,hydrolysis methane potential,methane production kinetics
Maxime Dooms Hassen Benbelkacem Pierre Buffiere
Univ Lyon, INSA-Lyon, DEEP research group, EA7429, F-69621 Villeurbanne cedex, France;Arkolia Energi Univ Lyon, INSA-Lyon, DEEP research group, EA7429, F-69621 Villeurbanne cedex, 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
121-124
2017-10-17（万方平台首次上网日期，不代表论文的发表时间）