斜生栅藻降解苯酚的动力学研究

研究结果表明，斜生栅藻在驯化１０ｄ后具备降解苯酚的能力，在２００ｍｇ／Ｌ初始浓度下，５ｄ时间内苯酚被全部降解，日平均降解速率达４０ｍｇ／Ｌ。在４００ｍｇ／Ｌ初始浓度下，６ｄ时间内日平均降解速率为７．５ｍｇ／Ｌ。在高初始浓度的苯酚不仅明显抑制了斜生栅藻的生长，而且抑制了斜生栅藻的降解活性，导致降解速度下降。用最近提出的生物降解二级反应动力学方程拟合上述降解过程，在苯酚初始浓度分别为２００ｍｇ／Ｌ和４００ｍｇ／Ｌ下，计算值与实测值之间的标准偏差分别为６．９ｍｇ／Ｌ和４．４ｍｇ／Ｌ。

STUDY ON KINETICS OF PHENOL BIODEGRADATION BY SCENEDESMUS OBLIQNUS

It is found that Scenedesmus obliqnus has an ability to biodegrade phenol after 10 days' acclimation of phenol.Phenol could be completely biodegraded by S.obliqnus at inital 200 mg/L and average biodegradation rate per day was 40.0mg/L in 5 days.However average phenol biodegradation rate per day was decrease to 7.5 mg/L at initial 400mg/L in 6 days.Both S.obliqnus' growth and biodegradation activity were apparently inhibited by hingher initial concentration of phenol,which might lead to the decrease of the biodegradation rate.Using a two order biodegradation kinetic equation recently suggested to fit the biodegradation processes,the standard deviations between calculated and observed values were 6.9mg/L and 4.4mg/L at inital 200mg/L and 400mg/L phenol,respectively.