Chu Libing, Yan Sangtian, Xing Xin-Hui, Sun Xulin, Jurcik Benjamin
Institute of Nuclear and New Energy Technology, Tsinghua University School of Biochemical Engineering, Beijing 100084, China.
Water Res. 2009 Apr;43(7):1811-22. doi: 10.1016/j.watres.2009.02.012. Epub 2009 Feb 20.
The treatment and disposal of excess sludge represents a bottleneck in wastewater treatment plants (WWTP) worldwide, due to environmental, economic, social and legal factors. The ideal solution to the problem of sludge disposal is to combine sludge reduction with the removal of pollution at the source. This paper presents an overview of the potential of ozonation in sludge reduction. The full-scale application of ozonation in excess sludge reduction is presented. Improvements in the biodegradability of the ozonated sludge were confirmed. The introduction of ozonation into activated sludge did not significantly influence effluent quality but improved the settling properties of the sludge. An operation with a suitable sludge wasting ratio seems to be necessary to prevent accumulation of inorganic and inert particles for long-term operation. Sludge ozonation to reduce excess sludge production may be economical in WWTP which have high sludge disposal costs and operational problems such as sludge foaming and bulking. The recommended ozone dose ranges from 0.03 to 0.05 g O(3)/g TSS, which is appropriate to achieve a balance between sludge reduction efficiency and cost. An effort to design and optimize an economic sludge reduction process is necessary.
由于环境、经济、社会和法律等因素，剩余污泥的处理与处置已成为全球污水处理厂（WWTP）的一个瓶颈。污泥处置问题的理想解决方案是将污泥减量与源头污染去除相结合。本文概述了臭氧氧化在污泥减量方面的潜力。介绍了臭氧氧化在剩余污泥减量中的实际应用。证实了经臭氧氧化处理的污泥其生物降解性有所改善。将臭氧氧化引入活性污泥中对出水水质影响不大，但改善了污泥的沉降性能。为防止长期运行中无机和惰性颗粒的积累，采用合适的排泥比运行似乎是必要的。对于污泥处置成本高且存在污泥发泡和膨胀等运行问题的污水处理厂，采用污泥臭氧氧化以减少剩余污泥产量可能具有经济性。推荐的臭氧投加量范围为0.03至0.05 g O₃/g TSS，这对于在污泥减量效率和成本之间实现平衡是合适的。有必要努力设计和优化一种经济的污泥减量工艺。
