IATE, Montpellier University, INRAE, Agro Institut, 34060, Montpellier, France; Mohammed VI Polytechnic University (UM6P), Ben Guerir, Morocco; APESA, Pôle Valorisation, Cap Ecologia, Lescar, France; LIMAT, Faculté des Sciences Ben M'Sik, Université Hassan II de Casablanca, Morocco.
APESA, Pôle Valorisation, Cap Ecologia, Lescar, France.
J Environ Manage. 2021 Feb 1;279:111632. doi: 10.1016/j.jenvman.2020.111632. Epub 2020 Dec 9.
After press separation of the liquid and solid digestate from an agricultural biogas plant, pyrolysis of solid anaerobic digestate was carried out (i.e., at 500 °C, 1h, and 10 °C/min) to produce biochar (37.6 wt%), bio-oil (33.7 wt%) and syngas (29.3 wt%). The organic phase of bio-oil and syngas exhibited high and low heating values of 28.4 MJ/kg and 12.9 MJ/Nm, respectively. Then, the synergy of coupling biochar with liquid digestate for agronomic purposes was investigated by leaching experiment and growth plant tests on wheat. Leaching experiments using combination of liquid digestate (170 kg N/ha) and biochar demonstrated that biochar addition increases the cumulative leaching of all nutrients, except nitrate, that have a significant decrease of 82% and 91%, respectively at 50 and 100 t/ha, compared to soil treated only with liquid digestate. The co-application of biochar with liquid digestate on growth wheat plant tests demonstrated that biochar application at 50 t/ha did not exhibit a negative impact on the relative seed germination and improved aerial dry biomass production (up to 27.5%) compared to soil with only liquid digestate addition.
从农业沼气厂分离出液体和固体消化物后，对固体厌氧消化物进行热解（即在 500°C、1h 和 10°C/min 的条件下），以生产生物炭（37.6wt%）、生物油（33.7wt%）和合成气（29.3wt%）。生物油和合成气的有机相具有较高和较低的发热值，分别为 28.4 MJ/kg 和 12.9 MJ/Nm。然后，通过浸出实验和小麦生长试验研究了生物炭与液体消化物耦合用于农业目的的协同作用。使用液体消化物（170kgN/ha）和生物炭组合进行的浸出实验表明，与仅用液体消化物处理的土壤相比，生物炭的添加增加了所有养分的累积浸出量，但硝酸盐除外，在 50 和 100t/ha 时，硝酸盐的浸出量分别显著减少了 82%和 91%。生物炭与液体消化物在小麦生长试验中的共同施用表明，与仅添加液体消化物的土壤相比，在 50t/ha 时应用生物炭不会对相对种子发芽率产生负面影响，并提高地上干生物量的产生（高达 27.5%）。
