Technical Research On Integrated Pretreatment Of Nitrobenzene Wastewater And Project Demonstration

Through deeply studying the treatment of nitrobenzene wastewater, this paper analyzes the influence effects under different technical condition, expatiates on mechanism that using iron and carbon revivification to deal with nitrobenzene wastewater, primarily bring forward nitrobenzene wastewater technical flow of pretreatment and the integrated treatment. Using iron and carbon revivification to pretreat nitrobenzene wastewater quality can be evidencely improved and also the degradation capability of the wastewater be enhanced. Meanwhile very good low investment be achieved. The main factors influencing iron and carbon revivification management are waterpower burthen, pH of inlet water and gas insolating intension which are confirmed the best bound by examination research. In the best reaction conditions, COD can be reduced by 50%, nitrobenzene can be reduced by 90%, while enhance B/C ratio from lower than 0.1 to 0.47. Most nitrobenzene component in the wastewater has been reduced to aniline through micro-electrolysis treatment, by which also enhance the degradation capability of the wastewater.The test also compares the effects of using iron chips and coke as filling material and iron and carbon revivification management of using iron chips and coke as filling material and the result indicates that the former has better effect than the latter, COD can be reduced higher by 20%, while whose investment is more than the latter and the clogging problem is appeared as using iron chips and coke as filling material. Hydrolysis acidification process can further reduce nitrobenzene concentration of wastewater and also reduce the amount of aniline in a large range. And B/C ratio of the effluent can be raised to 0.50 as a result, which provide better water quality for aerobic biological treatment. Using integration technicas of iron and carbon revivification plus hydrolysis acidification and CASS aerobic biological treatment can better dispose nitrobenzene wastewater economically and effectively. Apply aerobic biological treatment as a subsequent handling can ensure the wastewater disposal meet discharging standards.At the same time the treatment cost is comparatively very low and only 7.62 yuan per ton.This study has provided nitrobenzene wastewater treatment with reliable data and sufficient operational experiences for practical engineering design and processing, which can also be widely applied for other non-degradable chemical industry wastewater treatment.