Institute of Infrastructure, University of Innsbruck, Technikerstr. 13, 6020 Innsbruck, Austria.
Waste Manag. 2010 Jun;30(6):1057-62. doi: 10.1016/j.wasman.2009.12.011. Epub 2010 Jan 8.
This study presents a systematic comparison and evaluation of sewage sludge pre-treatment by mechanical and thermal techniques. Waste activated sludge (WAS) was pre-treated by separate full scale Thermo-Pressure-Hydrolysis (TDH) and ball milling facilities. Then the sludge was processed in pilot-scale digestion experiments. The results indicated that a significant increase in soluble organic matter could be achieved. TDH and ball milling pre-treatment could offer a feasible treatment method to efficiently disintegrate sludge and enhance biogas yield of digestion. The TDH increased biogas production by ca. 75% whereas ball milling allowed for an approximately 41% increase. The mechanisms of pre-treatment were investigated by numerical modeling based on Anaerobic Digestion Model No. 1 (ADM1) in the MatLab/SIMBA environment. TDH process induced advanced COD-solubilisation (COD(soluble)/COD(total)=43%) and specifically complete destruction of cell mass which is hardly degradable in conventional digestion. While the ball mill technique achieved a lower solubilisation rate (COD(soluble)/COD(total)=28%) and only a partial destruction of microbial decay products. From a whole-plant prospective relevant release of ammonia and formation of soluble inerts have been observed especially from thermal hydrolysis.
本研究对机械和热技术的污水污泥预处理进行了系统的比较和评估。采用单独的全规模热压水解（TDH）和球磨设备对废活性污泥（WAS）进行预处理。然后在中试规模消化实验中处理污泥。结果表明，可溶有机物的含量显著增加。TDH 和球磨预处理可以提供一种可行的处理方法，有效地分解污泥并提高消化的沼气产量。TDH 使沼气产量增加了约 75%，而球磨则使沼气产量增加了约 41%。通过在 MatLab/SIMBA 环境中的基于厌氧消化模型 No.1（ADM1）的数值建模研究了预处理的机制。TDH 工艺引起了先进的 COD 溶出（COD（可溶性）/COD（总）=43%），并特别彻底地破坏了在常规消化中几乎难以降解的细胞物质。而球磨技术的溶出率较低（COD（可溶性）/COD（总）=28%），仅对微生物降解产物进行部分破坏。从全厂的角度来看，特别是从热水解中观察到氨的释放和可溶性惰性物质的形成。
