The use of biochar (pyrolysed biomass) in anaerobic digesters can improve the efficiency of methane production at a low cost. However, the biochar dosage and the ability to re-use biochar affects the viability of this process improvement. This study shows the effects of high dosages of both pristine and re-used wood-pellet biochar on the performance of high-solids anaerobic digesters processing chicken litter. Performance was assessed on a basis of methane yield per gram of volatile solids and the volumetric efficiency. The 90-day methane yield increased by 39% with a pristine biochar dosage of 1 g_TS−char/g_TS−feed but unchanged under pristine biochar at lower dosages and re-used biochar at all three dosages. The use of pristine biochar at the highest dosage increased propionate degradation compared with other treatments. In addition, the highest dosage of pristine biochar causes the largest reduction in lag time compared with the control, a reduction of 35%. Lowering the biochar dosage affects the concentration of methanogens on the biochar. Methanosaetaceae and hydrogenotrophic methanogens had greater concentrations on the biochar at dosages of 0.25 and 0.5 g_TS−char/g_TS−feed. The addition of both pristine and re-used biochar at all three dosages investigated allows for shorter retention times and a greater number of batches to be processed per annum compared with digesters without biochar.

在厌氧消化池中使用生物炭（裂解的生物质）可以以较低的成本提高甲烷的生产效率。但是，生物炭的剂量和再利用生物炭的能力会影响该过程改进的可行性。这项研究表明，高剂量的原始和重复使用的木质颗粒生物炭对处理鸡粪的高固体厌氧消化池性能的影响。根据每克挥发性固体的甲烷收率和体积效率评估性能。在90天的甲烷产量与1g的原始生物炭剂量增加了39％_{TS -炭}/克_{TS -进料}但在较低剂量的原始生物炭下和在所有三种剂量下可重复使用的生物炭下均未改变。与其他处理方法相比，以最高剂量使用原始生物炭可增加丙酸酯的降解。另外，与对照相比，最高剂量的原始生物碳可导致最大的滞后时间减少，减少了35％。降低生物炭剂量会影响生物炭上产甲烷菌的浓度。Methanosaetaceae和氢营养甲烷以0.25和0.5克的剂量对生物炭更高浓度_{TS -炭}/克_{TS -进料}。与没有生物炭的蒸煮器相比，在所研究的所有三种剂量下都添加了原始生物炭和可重复使用的生物炭，可以缩短保留时间，并每年处理更多的批料。