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Research on Deep Degradation of Nitrobenzene in Wastewater by Two-stage Continuous Flow Denitrification

Author: LiangJia
Tutor: HeChengDa
School: Yangzhou University
Course: Municipal Engineering
Keywords: Two-stage continuous flow denitrification Nitrobenzene Nitrate Salinity
CLC: X703
Type: Master's thesis
Year: 2011
Downloads: 12
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Currently, organic chemical wastewater becomes the main source of toxic compounds in the water which is of high concentration, toxicity and hard to be biodegraded. Due to the complexity and specificity of its construction, the organic toxic compounds are hard to be efficiently harnessed by microbe and then enter into the material recycling. As a result, it becomes the central and difficult issue. Citing nitrobenzene as a typical kind of waste, this study investigates characteristic of deep degradation of nitrobenzene and the effect of salinity to the two-stage continuous flow denitrification system.After the complete research, we have obtained the following conclusions:(1) Two-stage continuous flow denitrification system has the relatively high and stable removal rate. The removal rate of COD system is90%, and the removal rate of nitrobenzene is97%. The influent concentration of80mg/l and the effluent nitrobenzene concentration of lower than1.5mg/l have reached the first-level emission standard (2.0mg/l) of Integrated Wastewater Discharge Standard (GB8978-1996).(2) Degradation of nitrobenzene by two-stage continuous flow denitrification method can effectively eliminate the secondary pollution of the intermediate aniline. With the gradual stability of the system, two-stage continuous flow denitrification method has a great effect on the elimination of aniline. The secondary effluent aniline reaches0-2.5mg/l.(3) The degree of load capacity to salinity impact in two-stage continuous flow denitrification method is apparently superior to the one-stage process. The salinity limit is higher than the the maximum limit of salinity (0.5%) within general biochemical process. The salinity limit in two-stage continuous flow denitrification method is0.8%. When the salinity rises beyond1.0%, due to the sensitivity of salinity shock loading, the removal rate will decrease rapidly. In contrast, the salinity shock loading of two-stage continuous flow denitrification method is relatively insensitive. (4) Comparing to the condition without salt, appropriate salinity actually improves the removal rate of nitrobenzene. When the salinity reaches0.5%and0%, the removal rate of one-stage nitrobenzene achieves96%and83%respectively. Comparing to the condition without salt, the removal rate of nitrobenzene rises approximately13%and the accumulation of nitrite is much less.The study confirms that deep degradation of nitrobenzene in wastewater using two-stage continuous flow denitrification method is feasible and available. This study has some reference value to the deep degradation of toxic organic compounds in industrial wastewater. And it has the vital significance of technological innovation.

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CLC: > Environmental science, safety science > Processing and comprehensive utilization of waste > General issues > Wastewater treatment and utilization
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