光照和营养盐对DBP在海河河口水中生物降解的影响

采集渤海海河河口水,在实验室受控条件下,研究了营养盐和光照条件对邻苯二甲酸二丁酯(DBP)生物降解的影响。实验结果表明:DBP在海河河口水中的生物降解符合一级动力学,微生物降解占总去除率的99%左右,微生物降解是DBP降解的主要途径。高营养水平时,DBP在光照、光暗条件下的生物降解速率常数分别为0.32d-1和0.41d-1;低营养水平时,DBP在光照、光暗条件下的生物降解速率常数分别为0.17d-1和0.20d-1。高营养条件下较高的微生物总量使DBP的生物降解速率明显大于相对低营养条件下的降解速率;在相同的营养条件下,光照能够改变水体中藻、菌的微生态结构,从而延迟DBP的降解。

Effects of Nutrients and Light on DBP Biodegradation in Haihe Estuary

Effects of nutrients and light on dibutyl phthalate(DBP) biodegradation in water samples of Haihe estuary were investigated.The results showed that biodegradation of DBP in the water samples followed first-order kinetics,and 99% of DBP in the water samples was removed by biodegradation.DBP transformation is primarily by biodegradation.First-order DBP biodegradation rate constant was 0.32d~(-1) in the light,and 0.41d~(-1) in the dark under high nutrient condition,0.17d~(-1) in the light,and 0.20d~(-1) in the dark under low nutrient condition,respectively.The higher biodegradation rate under high nutrient condition correlated with higher biomass.Proliferation of algae and bacteria was correlated and influenced by illumination because of nutrient limitation,and DBP biodegradation was retarded in the presence of illumination.