Effects of antimicrobial compounds on dry anaerobic digestion (dry-AD) processes were investigated. Four compounds with known inhibition effects on traditional wet digestion, i.e. car-3-ene, hexanal, 1-octanol and phenol were selected and investigated at concentrations of 0.005%, 0.05% and 0.5%. Food waste (FW) and Paper waste (PW) were used as model substrates, all assays were running with the substrate to inoculum ratio of 1:1 (VS basis) corresponding to 15% TS in reactors. Generally, increasing concentrations of inhibitors resulted in decreasing methane yields with a few exceptions; in all these specific cases, long, lag phase periods (60 days) were observed. These adaptation periods made possible for the microbial systems to acclimatize to otherwise not preferred conditions leading to higher methane yields. Comparing the effects of the four different groups, phenols had the highest inhibitory effects, with no methane production at the highest amount added, while the lowest effects were obtained in cases of car-3-ene. Furthermore, the results showed that adding inhibitors up to a certain concentrations can repair the balance in AD process, slowing down the degradation steps, hence making it possible for the methanogens to produce a higher amount of methane. This phenomenon was not observed in case of PW, which is already a slow degradable substrate in its nature.

中文翻译：

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有机化合物对食品和造纸工业废物干式厌氧消化的影响。

研究了抗菌化合物对干式厌氧消化（dry-AD）过程的影响。选择了对传统湿消化具有抑制作用的四种化合物，即Car-3-ene，己醛，1-辛醇和苯酚，并以0.005％，0.05％和0.5％的浓度进行了研究。将食物垃圾（FW）和纸张垃圾（PW）用作模型底物，所有测定均以底物与接种物的比例为1：1（以VS为基准）进行，对应于反应器中15％的TS。通常，增加抑制剂的浓度会导致甲烷产量的下降，只有少数例外。在所有这些特定情况下，都观察到了较长的延迟阶段（60天）。这些适应期使微生物系统能够适应否则会导致较高甲烷产率的非优选条件。比较这四个不同组的效果，苯酚的抑制效果最高，添加量最高时不会产生甲烷，而在car-3-ene情况下效果最低。此外，结果表明，添加一定浓度的抑制剂可以修复AD过程中的平衡，减慢降解步骤，从而使产甲烷菌产生更高量的甲烷成为可能。在PW的情况下未观察到此现象，而PW本质上已经是可缓慢降解的基质。结果表明，添加一定浓度的抑制剂可以修复AD过程中的平衡，减慢降解步骤，从而使产甲烷菌产生更高量的甲烷成为可能。在PW的情况下未观察到此现象，而PW本质上已经是可缓慢降解的基质。结果表明，添加一定浓度的抑制剂可以修复AD过程中的平衡，减慢降解步骤，从而使产甲烷菌产生更高量的甲烷成为可能。在PW的情况下未观察到此现象，而PW本质上已经是可缓慢降解的基质。