Phothilangka P, Schoen M A, Wett B
University of Innsbruck, Institute of Infrastructure, Technikerstr.13, 6020 Innsbruck, Austria.
Water Sci Technol. 2008;58(8):1547-53. doi: 10.2166/wst.2008.500.
This paper presents benefits and potential drawbacks of thermal pre-hydrolysis of sewage sludge from an operator's prospective. The innovative continuous Thermo-Pressure-Hydrolysis Process (TDH) has been tested in full-scale at Zirl wastewater treatment plant (WWTP), Austria, and its influence on sludge digestion and dewatering has been evaluated. A mathematical plant-wide model with application of the IWA Activated Sludge Model No.1 (ASM1) and the Anaerobic Digestion Model No.1 (ADM1) has been used for a systematic comparison of both scenarios--operational plant performance with and without thermal pre-hydrolysis. The impacts of TDH pre-hydrolysis on biogas potential, dewatering performance and return load in terms of ammonia and inert organic compounds (Si) have been simulated by the calibrated model and are displayed by Sankey mass flow figures. Implementation of full scale TDH process provided higher anaerobic degradation efficiency with subsequent increased biogas production (+75-80%) from waste activated sludge (WAS). Both effects--enhanced degradation of organic matter and improved cake's solids content from 25.2 to 32.7% TSS--promise a reduction in sludge disposal costs of about 25%. However, increased ammonia release and generation of soluble inerts Si was observed when TDH process was introduced.
本文从运营者的角度介绍了污水污泥热预处理的优点和潜在缺点。创新的连续热压水解工艺（TDH）已在奥地利齐尔污水处理厂（WWTP）进行了全规模测试，并评估了其对污泥消化和脱水的影响。采用应用国际水协活性污泥1号模型（ASM1）和厌氧消化1号模型（ADM1）的全厂数学模型，对有无热预处理两种情况下的运营厂性能进行了系统比较。通过校准模型模拟了TDH预处理对沼气潜力、脱水性能以及氨和惰性有机化合物（Si）回流负荷的影响，并通过桑基质量流量图进行展示。全规模TDH工艺的实施提高了厌氧降解效率，随后来自剩余活性污泥（WAS）的沼气产量增加了75 - 80%。这两种效果——有机物降解增强以及饼状污泥的固体含量从25.2%总悬浮固体提高到32.7%——有望使污泥处置成本降低约25%。然而，引入TDH工艺时观察到氨释放增加以及可溶性惰性物质Si的产生。
