Technical Study On Iron-carbon Microelectrolysis Pretreatment Of Cyclohexanone Processing Wastewater

Cyclohexanone processing wastewater is a new type effluent of chemical industry which appeared in recent years. This wastewater contains a lot of cyclohexanone, cyclohexanol, organic acid and other larger molecular organics. It is hard to be treated by biochemical treatment, so it results in huge environmental contamination. A systematic study was conducted on the iron-carbon microelectrolysis treatment technology characteristics of cyclohexanone processing wastewater. The study contains laboratory experiments and practical engineering application. The emphasis of pretreatment is focus on improving wastewater biodegradability, the reduction of content of organics and chroma.The thesis is focused on run parameters and influence factors of iroen-carbon microelectrolysis treatment technology, and the biodegradability of microelectrolysis effluent as well. The optimal parameter is obtained through experiments.The static experiment on microelectrolysis treatment technology shows that the five important influencing factors are determined, such as coagulation, aeration, iron-carbon quality ratio, the pH of influent, and hydraulic retention time. The results of experiment show that coagulation and aeration can strengthen the treatment effect. The COD removal rate between 40%~60% and the effluent chroma between 100~200, when iron-carbon quality ratio is 1:2, pH of influent is 2~4, hydrolic retention time is about 4 hours.The dynamic experiment on microelectrolysis treatment technology also shows that the effect of the five important influencing factors such as coagulation, aeration, iron-carbon quality ratio, the pH of influent, and hydraulic retention time. The results of experiment show that iron-carbon microelectrolysis-coagulation is the optimal treatment technology. The optimal parameter is iron-carbon quality ratio is 1:2, pH of influent is 2～4, hydrolic retention time is about 4 hours and aeration installment is runing. The pH of effluent is about 7.The anaerobic biotreatment verifying experiment shows the improvability of the biodegradability of microelectrolysis effluent. The results of experiment show that microelectrolysis effluent can be treated by anaerobic biotreatment, the COD removal rate attain 75%, the chroma is less than 10. The larger molecular organics are broke up and transform to smaller ones through iron-carbon microelectrolysis treatment. The biodegradability of wastewater is improved.The optimal parameter is obtained and applied in practical engineering application. The optimal parameter is iron-carbon quality ratio is 1:2, pH of influent is 2～4, hydrolic retention time is about 4 hours and aeration installment is runing. When the iron-carbon microelectrolysis reactor is running for 1 month, the COD removal rate retain between 45%～50% and long-term stable operation of the latter anaerobic biotreatment reactor is built up.