Bertanza Giorgio, Galessi Raniero, Menoni Laura, Salvetti Roberta, Slavik Edoardo, Zanaboni Sabrina
Department of Civil, Environmental, Architectural Engineering and Mathematics, University of Brescia, via Branze 43, I-25123, Brescia, Italy,
Environ Sci Pollut Res Int. 2015 May;22(10):7306-16. doi: 10.1007/s11356-014-3144-9. Epub 2014 Jun 12.
Nowadays, sewage sludge management represents one of the most important issues in wastewater treatment. Within the European project "ROUTES," wet oxidation (WO) was proposed for sludge minimization. Four different types of sludge were treated in an industrial WO plant: (1) municipal primary sludge (chemical oxygen demand COD: 73.0 g/L; volatile suspended solid VSS: 44.1 g/L); (2) secondary sludge from an industrial wastewater treatment plant (WWTP) without primary sedimentation (COD: 71.8 g/L; VSS: 34.2 g/L); (3) secondary sludge from a mixed municipal and industrial WWTP without primary sedimentation (COD: 61.9 g/L; VSS: 38.7 g/L); and (4) mixed primary (70%) and secondary (30%) municipal sludge (COD: 81.2 g/L; VSS: 40.6 g/L). The effect of process parameters (temperature, reaction time, oxygen dosage) on WO performance was investigated. Depending on operating conditions, VSS and COD removal efficiency varied in the range 80-97% and 43-71%, respectively. A correlation between process efficiency and the initial VSS/TSS (total suspended solids) ratio was highlighted. Furthermore, a mathematical model of WO process for simulating VSS and COD profiles was developed.
如今，污泥管理是废水处理中最重要的问题之一。在欧洲项目“ROUTES”中，提出采用湿式氧化法（WO）来减少污泥量。在一座工业湿式氧化处理厂中处理了四种不同类型的污泥：（1）城市初级污泥（化学需氧量COD：73.0克/升；挥发性悬浮固体VSS：44.1克/升）；（2）来自无初级沉淀的工业废水处理厂（WWTP）的二级污泥（COD：71.8克/升；VSS：34.2克/升）；（3）来自无初级沉淀的城市与工业混合污水处理厂的二级污泥（COD：61.9克/升；VSS：38.7克/升）；以及（4）城市混合初级（70%）和二级（30%）污泥（COD：81.2克/升；VSS：40.6克/升）。研究了工艺参数（温度、反应时间、氧气用量）对湿式氧化性能的影响。根据操作条件，VSS和COD去除效率分别在80 - 97%和43 - 71%的范围内变化。突出了工艺效率与初始VSS/TSS（总悬浮固体）比率之间的相关性。此外，还开发了用于模拟VSS和COD曲线的湿式氧化过程数学模型。
