Strategic Water Infrastructure Laboratory, School of Civil, Mining and Environmental Engineering, University of Wollongong, Keiraville NSW 2522, Australia.
School of Civil and Environmental Engineering, University of New South Wales, Kensington NSW 2052, Australia.
Bioresour Technol. 2018 May;256:384-390. doi: 10.1016/j.biortech.2018.02.040. Epub 2018 Feb 10.
A pilot-scale study was conducted to investigate the fate of trace organic contaminants (TrOCs) during anaerobic digestion of primary sludge. Of the 44 TrOCs monitored, 24 were detected in all primary sludge samples. Phase distribution of TrOCs was correlated well with their hydrophobicity (>67% mass in the solid phase when LogD > 1.5). The pilot-scale anaerobic digester achieved a steady performance with a specific methane yield of 0.39-0.92 L/gVS and methane composition of 63-65% despite considerable variation in the primary sludge. The fate of TrOCs in the aqueous and solid phases was governed by their physicochemical properties. Biotransformation was significant (>83%) for five TrOCs with logD < 1.5 and electron donating functional groups in molecular structure. The remaining TrOCs with logD < 1.5 were persistent and thus accumulated in the aqueous phase. Most TrOCs with logD > 1.5 were poorly removed under anaerobic conditions. Sorption onto the solid phase appears to impede the biodegradation of these TrOCs.
进行了一项中试规模的研究，以调查痕量有机污染物（TrOCs）在原污泥厌氧消化过程中的命运。在所监测的 44 种 TrOCs 中，有 24 种在所有原污泥样品中均有检出。TrOCs 的相分布与其疏水性密切相关（LogD>1.5 时，固相中的质量占比超过 67%）。尽管原污泥变化较大，但中试规模的厌氧消化器仍能稳定运行，比甲烷产率为 0.39-0.92 L/gVS，甲烷组成 63-65%。在水相和固相中，TrOCs 的命运取决于其物理化学性质。对于 logD<1.5 和分子结构中具有供电子官能团的五种 TrOCs，生物转化作用显著（>83%）。其余 logD<1.5 的 TrOCs 则具有持久性，因此在水相中积累。大多数 logD>1.5 的 TrOCs 在厌氧条件下难以去除。吸附到固相上似乎阻碍了这些 TrOCs 的生物降解。
