Department of Environmental Science and Engineering, Tsinghua University, Beijing 100084, P. R. China.
Water Sci Technol. 2010;62(4):751-8. doi: 10.2166/wst.2010.126.
Bench-scale experiments were conducted to investigate the application of ozonation pre-treatment for biologically treated textile and dyeing wastewater to improve performance of the RO process. Based on ozonation experiments, four specific ozone consumptions (SOC), 0, 0.3, 0.6, 4.0 mg O₃/mg DOC₀ were chosen for study of the effects of ozonation on the reverse osmosis (RO) process. Membrane flux was recorded. Also, the permeate water quality parameters such as TOC, conductivity were analyzed. In addition, fouled membrane cleaning was studied. The study further examined the nature and mechanisms of membrane fouling using scanning electron microscopy (SEM) and the energy dispersive X-ray spectrometer (EDS). The effect of ozonation on RO filtration was found to depend on SOC. The study revealed that significant improvement can be achieved in the efficiency of RO filtration by employing ozonation with 0.6 mg O₃/mg DOC₀ SOC. Although the product water purity slightly decreased, the ozonation pre-treatment showed advantages at 0.6 mg O₃/mg DOC₀ SOC for the following: (i) mitigation of flux decline due to membrane fouling; (ii) improvement in foulants cleanability. In addition, hypotheses were put forward to explain the reasons from the aspect of organic matter characteristics changed by ozonation, such as changing on functional groups and molecular weight of organic matter.
进行了中试规模的实验，以研究臭氧预处理对生物处理的纺织和印染废水的应用，以提高反渗透（RO）过程的性能。基于臭氧实验，选择了四个特定的臭氧消耗（SOC），0、0.3、0.6 和 4.0 mg O₃/mg DOC₀，研究臭氧对反渗透过程的影响。记录了膜通量。此外，还分析了渗透水水质参数，如 TOC、电导率。此外，还研究了污染膜的清洗。该研究进一步使用扫描电子显微镜（SEM）和能谱仪（EDS）研究了膜污染的性质和机制。研究发现，臭氧氧化对 RO 过滤的影响取决于 SOC。研究表明，采用 0.6 mg O₃/mg DOC₀ SOC 的臭氧氧化可以显著提高 RO 过滤的效率。尽管产水纯度略有下降，但在 0.6 mg O₃/mg DOC₀ SOC 下，臭氧预处理具有以下优势：（i）减轻膜污染引起的通量下降；（ii）提高污染物的可清洗性。此外，还提出了假设，从臭氧处理改变有机物特性的角度解释原因，如改变官能团和有机物的分子量。
