Biodegration of LAS in an urban malodorous river
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摘要: 采用"river-die away"研究不同环境条件下阴离子表面活性剂LAS在上海市普陀区李湾河黑臭水体中的降解.探究不同的温度、pH、LAS初始浓度、葡萄糖和曝气条件对LAS生物降解的影响.结果表明：温度由10℃升至30℃，LAS降解半衰期由6.5 d降至2.5 d；表面活性剂在pH值为8.5±0.2时的降解性能优于pH值为7.5±0.2和pH值为9.5±0.2的降解性能；各实验组降解半衰期随着LAS初始浓度增大而增大（由2.9 d增至3.4 d）；添加葡萄糖会抑制LAS生物降解，连续曝气会促进LAS生物降解.Abstract: Biodegradation of the anion-surfactant LAS in the urban malodorous water of Liwan River in Putuo District (Shanghai) was studied by "river-die away"under different conditions. In particular, the influences of temperature, pH, initial concentration of LAS, nutrients (C6H12O6) and aeration conditions on the biodegradation of LAS were investigated. The study showed that when the temperature increased from 10℃ to 30℃, the half-life of LAS decreased from 6.5 days to 2.5 days. The biodegration of surfactant at pH=8.5±0.2 was slightly better than that at pH=7.5±0.2 and pH=9.5±0.2. With greater initial concentration, the half-life of LAS increased from 2.9 days to 3.4 days. C6H12O6 inhibited degradation of LAS, but the degradation of LAS accelerated under continuous aeration conditions.
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Key words:
- LAS /
- urban malodorous river /
- biodegration
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图 3 不同初始浓度LAS的降解曲线
Fig. 3 The degration curves of LAS under different initial concertration
表 1 LAS生物降解实验的培养条件
Tab. 1 Different cultivation conditions for the biodegration of LAS
不同培养条件 LAS初始浓度/(mg$\cdot$L$^{-1})$ 温度/℃ pH值 葡萄糖浓度/(g$\cdot $L$^{-1})$ 曝气条件 温度 3.33 10 7.5$\pm $0.2 0 不曝气 3.33 20 7.5$\pm $0.2 0 不曝气 3.33 30 7.5$\pm $0.2 0 不曝气 pH 3.33 20 7.5$\pm $0.2 0 不曝气 3.33 20 8.5$\pm $0.2 0 不曝气 3.33 20 9.5$\pm $0.2 0 不曝气 初始浓度 3.33 20 7.5$\pm$0.2 0 不曝气 5.90 20 7.5$\pm $0.2 0 不曝气 11.10 20 7.5$\pm $0.2 0 不曝气 添加营养物质 3.33 20 7.5$\pm$0.2 3 不曝气 3.33 20 7.5$\pm $0.2 0 不曝气 溶氧状态 3.33 20 7.5$\pm$0.2 0 曝气 3.33 20 7.5$\pm $0.2 0 不曝气 
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表 2 LAS与环境因子间相关性分析(n=126)
Tab. 2 Correlation analysis between LAS and environmental parameters (n=126)
温度 pH 初始浓度 碳源 曝气 LAS 温度 1 pH 0.021 1 初始浓度 0.032 0.108 1 碳源 0.014 -0.180* -0.164 1 曝气 0.312* 0.180* 0.164 0.125 1 LAS -.094 -0.391 0.290** 0.136 -0.310** 1 注: *表示p < 0.05, **表示p < 0.01
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