| The aerobic biodegradability and degradation kinetics of three nitrophenols were researched in this paper. The kinetics parameter can be used for this kind of wastewater treatment facilities. This research composed of two parts. Aerobic biodegradability of three nitrophenols were evaluated through four test methods in one part. In the other part, aerobic sludge which had good degrading effects was cultivated and acclimated in SBR reactors by using man-made nitrophenol wasterwater. At the same time, the degradation kinetics of the three nitrophenols were researched. The following achievements are obtained.(1) The water quality test demonstrates that 3-NP, 2,4-DNP and 2,6-DNP are all non-easy to degrade. Production Carbon Dioxide test demonstrates the above three nitrophenols are easily degradable, degradable and difficultly degradable respectively. The test by measuring oxygen utilization rate and dehydrogenase activity determing method show that the toxity of the three nitrophenols are 3-NP<2,4-DNP<2,6-DNP.(2) In the process of acclimation, the start-up and function of 3-NP is easy and can be stable quickly. The initial 3-NP concentration achieves 180mg/L in 80days. When the test substances are 2,4-DNP and 2,6-DNP , the acclimation are difficult. The sludge are damaged when 2,4-DNP and 2,6-DNP intial concentration achieve 30mg/L and 25mg/L respectively. The whole acclimation needs 80days. (3) Degradation Kinetics of 3-NPDegradation rate of 3-NP is faster when using TuanDao wastewater treatment sludge. The degradation kinetics are the same on the two conditions. With 3-NP intial concentration increasing, the degradation rate both decreased.When 3-NP intial concentration is 45mg/L, the degradation follows zero-reaction kinetic, the kinetic constant is 0.257 mg/(mgSS·d). When the intial concentration increases from 200mg/L to 360mg/L, the degradation fits Andrews inhition kinetics well. The maximum degradation rate Kmax decreases and the inhibition constant KI increases...
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