LAS在城市黑臭河道中的生物降解

Biodegration of LAS in an urban malodorous river

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.

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?C to 30?C,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.