Politecnico di Milano, DIIAR - Environmental Section, Piazza Leonardo da Vinci 32, 20133 Milano.
Water Sci Technol. 2011;63(9):2032-8. doi: 10.2166/wst.2011.456.
This paper presents a full-scale experience of sludge minimization by means of short contact time ozonation in a wastewater treatment plant (WWTP) mainly fed on textile wastewater. The WWTP performance over a 3-year operational data series was analysed and compared with a two-year operation with sludge ozonation. Lab-scale respirometric tests were also performed to characterize biomass activity upstream and downstream of the ozone contact reactor. Results suggest that sludge ozonation: (1) is capable of decreasing excess sludge production by 17%; (2) partially decreases both N removal, by lowering the denitrification capacity, and P removal, by reducing biomass synthesis; (3) increases the decay rate from the typical value of 0.62 d(-1) to 1.3 d(-1); (4) decreases the heterotrophic growth yield from the typical value of 0.67 to 0.58 gCOD/gCOD.
本文介绍了在一个主要处理纺织废水的污水处理厂（WWTP）中通过短接触时间臭氧氧化实现污泥最小化的全面经验。分析了该 WWTP 在 3 年运行数据系列中的性能，并与污泥臭氧氧化的两年运行进行了比较。还进行了实验室规模的呼吸测量试验，以表征臭氧接触反应器前后的生物量活性。结果表明，污泥臭氧氧化：（1）能够将剩余污泥产量减少 17%；（2）通过降低反硝化能力部分降低氮去除率，通过减少生物量合成部分降低磷去除率；（3）将衰减率从典型值 0.62 d(-1)提高到 1.3 d(-1)；（4）将异养生长产率从典型值 0.67 降低到 0.58 gCOD/gCOD。
