ABSTRACT

The effects of pure oxygen aeration on organic pollutants removal performance and effluent soluble microbial products (SMP) characteristics of salt-tolerant sludge for the treatment of wastewater with the salinity from 1.0% to 3.5% were investigated. The results showed that the oxygen transfer efficiency of the pure oxygen aeration was higher than that of the air aeration. At the low salinities (0.5%, 1.0%, 1.5%), the total organic carbon (TOC) removal rates were 71.42%, 72.88% and 76.30%, respectively, much higher than those with air aeration. However, there were no significant differences of TOC removal efficiency between the air aeration and the pure oxygen aeration at high salinities (2.5% and 3.5%). The SMP contents showed a trend of first decline and then increase generally. The content of SMP with pure oxygen aeration was lower than that with air aeration at low salinity, whereas an opposite result was obtained for salinity above 2.5%. Five excitation–emission matrix (EEM) fluorescence peaks detected in the SMP with pure oxygen aeration and air aeration were assigned to tryptophan protein-like, tyrosine protein-like and humic acid-like substances. Humic acid-like fluorescence mainly appeared in the SMP with air aeration, which may be due to respiratory failure under air aeration conditions.

摘要

研究了纯氧曝气对含盐度为1.0%~3.5%废水的耐盐污泥去除有机污染物性能和出水可溶性微生物产物(SMP)特性的影响。结果表明，纯氧曝气的氧气传递效率高于空气曝气。在低盐度（0.5%、1.0%、1.5%）下，总有机碳（TOC）去除率分别为71.42%、72.88%和76.30%，远高于空气曝气。然而，空气曝气和纯氧曝气在高盐度（2.5% 和 3.5%）下的 TOC 去除效率没有显着差异。SMP含量总体呈先下降后上升的趋势。在低盐度下，纯氧曝气的SMP含量低于空气曝气，而盐度高于2.5%则相反。在具有纯氧曝气和空气曝气的 SMP 中检测到的五个激发 - 发射矩阵 (EEM) 荧光峰被分配给类色氨酸蛋白、类酪氨酸蛋白和类腐植酸物质。腐植酸样荧光主要出现在通气条件下的SMP中，这可能是通气条件下呼吸衰竭所致。