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Wet oxidation of sewage sludge from municipal and industrial WWTPs

机译：市政和工业污水处理厂的污水污泥的湿式氧化

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In the last years, sewage sludge management turned out to be a topic of great interest due to the increasing sludge production and the high cost of sludge treatment and disposal. In this context, several methods are being studied for sewage sludge minimization: among them, wet oxidation (WO) was proposed as an effective hydrothermal oxidation based technology. The aim of this work, carried out within the European project ROUTES, was the assessment of the influence of sludge composition on process performance: for this purpose, seven different types of sewage sludge were submitted to WO tests at lab scale. Moreover, each operating condition (temperature, reaction time, and initial oxygen pressure) was varied so as to highlight the effect of process parameters on oxidation efficiency; this was essentially evaluated in terms of chemical oxygen demand (COD), volatile suspended solid (VSS) and total suspended solid (TSS) reduction. COD and VSS abatement varied in the ranges 44-85%, 71-99% depending on reaction time (15-120min) and 22-79%, 54-99% as a function of temperature (200-250 degrees C), respectively. Furthermore, by comparing WO tests results of the seven types of sludge obtained under the same treatment conditions (temperature=250 degrees C and reaction time=60min), it was highlighted that VSS and COD removal efficiency can be correlated to the initial VSS/TSS ratio.
机译：在过去的几年中，由于污泥产量的增加以及污泥处理和处置的高昂成本，污水污泥管理成为一个备受关注的话题。在此背景下，正在研究几种减少污泥的方法：其中，湿式氧化（WO）被提出作为一种有效的基于水热氧化的技术。在欧洲项目ROUTES中进行的这项工作的目的是评估污泥组成对工艺性能的影响：为此，在实验室规模下将7种不同类型的污水污泥提交给WO测试。此外，改变每个操作条件（温度，反应时间和初始氧气压力），以突出工艺参数对氧化效率的影响。基本上从化学需氧量（COD），挥发性悬浮固体（VSS）和总悬浮固体（TSS）减少方面进行了评估。根据反应时间（15-120分钟）和温度（200-250摄氏度）的变化，COD和VSS的减少分别在44-85％，71-99％的范围内变化和22-79％，54-99％的变化范围。此外，通过比较在相同处理条件下（温度= 250摄氏度和反应时间= 60分钟）获得的七种污泥的WO测试结果，可以看出VSS和COD去除效率可以与初始VSS / TSS相关比。

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