Hamburg University of Technology, Institute of Wastewater Management and Water Protection, 21073 Hamburg, Germany; University of Gondar, Department of Environmental and Occupational Health, P.O. Box. 196, Gondar, Ethiopia.
Hamburg University of Technology, Institute of Wastewater Management and Water Protection, 21073 Hamburg, Germany.
Waste Manag. 2019 Feb 15;85:417-424. doi: 10.1016/j.wasman.2018.12.046. Epub 2019 Jan 12.
Deinking sludge (DS) is a residue from the waste paper recycling industry. It is a by-product originating from the deinking process which is designed to remove inks and other impurities from waste papers to recover usable fibers. The aim of this study was to investigate the possibility of anaerobic digestion (AD) of DS in order to produce methane (CH) by degrading organic matter. DS differs clearly from common AD substrates due to its specific composition. The focus was laid on comparing various inocula in order to find appropriate microbial consortia. Three inocula from different origins were investigated. After sludge and inocula characterization, batch AD at a mesophilic (37 °C) condition was performed for 21 days to determine biogas and CH potentials as well as sludge biodegradability in comparison to cellulose. The highest average CH yield achieved in the 21 days of the batch experiment was 167 NmL/g organic dry matter (oDM). However, the CH potentials from all experiments did not have a wide range (average 160 NmL/g oDM; standard deviation ±5.0 NmL/g oDM). The highest organic matter degradation achieved was 31%. It can be stated that conventional AD inocula are usable to degrade DS, but that a significant part of the oDM was anaerobically not degradable. The overall CH yields were lower compared to top AD substrates such as energy crops, but in a similar range like residue-based AD substrates such as manure. Since actual DS management is cost-intensive and affecting the profitability of waste paper industry significantly, AD as a management option with an energetically valuable output is a very promising option.
脱墨污泥（DS）是废纸回收行业的一种残渣。它是脱墨过程中产生的副产品，旨在去除废纸中的油墨和其他杂质，以回收可用纤维。本研究旨在探讨 DS 进行厌氧消化（AD）的可能性，以便通过降解有机物来生产甲烷（CH）。DS 因其特殊的组成而明显不同于常见的 AD 底物。重点是比较各种接种物，以找到合适的微生物群落。研究了来自不同来源的三种接种物。在污泥和接种物特性分析之后，在中温（37°C）条件下进行批式 AD 实验，以确定沼气和 CH 潜力以及与纤维素相比的污泥生物降解性。批式实验 21 天内获得的最高平均 CH 产率为 167 NmL/g 有机干物质（oDM）。然而，所有实验的 CH 潜力范围都不大（平均 160 NmL/g oDM；标准偏差 ±5.0 NmL/g oDM）。实现的最大有机物降解率为 31%。可以说，传统的 AD 接种物可用于降解 DS，但 oDM 的很大一部分在厌氧条件下不可降解。与能源作物等顶级 AD 底物相比，整体 CH 产率较低，但与粪便等基于残渣的 AD 底物相当。由于实际的 DS 管理成本高昂，对废纸行业的盈利能力有重大影响，因此作为具有有价值能源输出的管理选项，AD 是一个非常有前途的选择。
