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Revealing the membrane fouling mechanism caused by the denitrification filter effluent during ozonation by model assessment
Journal of Water Reuse and Desalination ( IF 2.3 ) Pub Date : 2021-06-01 , DOI: 10.2166/wrd.2021.005
Yuan Bai 1 , Yin-Hu Wu 1 , Xin Tong 1 , Yun-Hong Wang 1 , Nozomu Ikuno 2 , Wei Wang 3 , Yu-Long Shi 3 , Hong-Ying Hu 1, 4
Affiliation  

Membrane fouling has been a major obstacle for stable operation of ultrafiltration. In this study, prevailing fouling models were applied to assess the fouling behavior of the denitrification filter (DNF) effluent during ozonation. In order to clarify the fouling mechanism, correlation analysis and redundancy analysis (RDA) were conducted to investigate the correlations among model parameters, fouling potential and water features of the DNF effluent. The combined intermediate-standard model exhibited superior determination coefficients (R2 > 0.99). Based on analytical results, the model parameter of intermediate blocking (Ki) and standard blocking (Ks) was fairly applicable to describe the fouling of higher molecular weight (F1, MW >4,000 Da) and lower molecular weight fractions (F2, MW = 2,000–4,000 Da and F3, MW < 2,000 Da), respectively. In comparison, F1 played a predominant role in the fouling behavior of the DNF effluent. Increased ozone dosage resulted in decreased membrane fouling contribution of F1 and increased fouling contribution of F2 and F3 during ozonation. The change of fouling contributions was attributed to the transformation of high MW fractions into lower MW fractions by ozonation. This study clarified the relationships between model parameters and the membrane fouling process caused by organic fractions with specific molecular weight, thus demonstrating the membrane fouling mechanism of the DNF effluent during ozonation.



中文翻译:

通过模型评估揭示臭氧化过程中反硝化过滤器出水引起的膜污染机制

膜污染一直是超滤稳定运行的主要障碍。在这项研究中,应用流行的污垢模型来评估臭氧化过程中反硝化过滤器 (DNF) 流出物的污垢行为。为了阐明污染机理,通过相关分析和冗余分析(RDA)研究了模型参数、污染潜力和DNF出水水特征之间的相关性。组合中间标准模型表现出优越的决定系数(R 2 > 0.99)。根据分析结果,中间阻塞(K i)和标准阻塞(K s) 分别适用于描述较高分子量 (F1, MW > 4,000 Da) 和较低分子量级分 (F2, MW = 2,000–4,000 Da 和 F3, MW < 2,000 Da) 的污垢。相比之下,F1 在 DNF 流出物的结垢行为中起主要作用。在臭氧化过程中,增加臭氧剂量导致 F1 的膜污染贡献减少和 F2 和 F3 的污染贡献增加。污垢贡献的变化归因于通过臭氧化将高 MW 部分转化为较低 MW 部分。该研究阐明了模型参数与特定分子量的有机组分引起的膜污染过程之间的关系,从而证明了臭氧化过程中 DNF 流出物的膜污染机制。

更新日期:2021-06-14
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