The Study On Treatment Of Amides Wastewater Using Fenton Oxidation Coupled Iron Carbon Micro-electrolysis Method

The DMF and DMAC, which are widely used in petroleum industry, chemical industry,pharmaceutical industry, pesticide industry and other industries as an important chemical rawmaterial and organic solvent, will produce a large number of DMF and DMAC wastewater.With the characteristics of stable chemical properties and serious harmfulness, the directemissions of DMF and DMAC wastewater without any treatment not only bring the seriousharm to the environment and humans, but also a huge resource waster of DMF and DMAC.At present, the domestic research on DMAC wastewater is more mature and thorough thanDMF. Therefore, the experiment, we put forward to treat the DMF wastewater by Fentonoxidation based on previous studies and explore the various factors effects in this thesis, hasthe important practical significance. In order to reduce the treatment cost of DMF wastewater,we also test the effect of Fenton oxidation coupling micro-electrolysis deal with the DMFwastewater.This thesis studied the DMF wastewater treatment using Fenton oxidation method,micro-electrolysis, Fenton oxidation coupling iron carbon micro electrolysis and the influenceof pH, reaction time, Fe2+concentration, H₂O₂concentration, raw water concentration and soon respectively. And then we got the optimum conditions of various reaction: The Fentonoxidation is pH3, reaction time of40minutes, FeSO₄·7H₂O dosage of1500mg/L, H₂O₂dosage of3ml/L, the original concentration of250mg/L. raw water concentration of250mg/L;The micro-electrolysis is Fe: C ratio of1:3, pH3, reaction time of60minutes; The Fentonoxidation after iron-carbon micro-electrolysis is pH3, FeSO₄·7H₂O dosage of1000mg/L,H₂O₂dosage of2.67ml/L; The Fenton oxidation before iron-carbon micro-electrolysis is pH5,FeSO₄·7H₂O dosage of1000mg/L, H₂O₂dosage of2.67ml/L, without aeration.The COD removal rate of iron carbon micro electrolysis treatment DMF wastewater canreach40%, the Fenton oxidation is49.7%and the Fenton oxidation before iron-carbonmicro-electrolysis is72.22%， so we find the Fenton oxidation before iron-carbonmicro-electrolysis achieve strengthening the Fenton oxidation before iron-carbonmicro-electrolysis effect. But the COD removal rate of the Fenton oxidation after iron-carbonmicro-electrolysis is only40%, which cannot strengthen the Fenton oxidation beforeiron-carbon micro-electrolysis effect. Therefore, in the use of Fenton oxidation couplingiron-carbon micro-electrolysis technology treatment of DMF wastewater, we should choosethe Fenton oxidation before iron-carbon micro-electrolysis.Under the optimum conditions of the Fenton oxidation before iron-carbonmicro-electrolysis, The COD removal rate of DMF wastewater is65%and45%withoutaeration. In order to verify removal effect of the Fenton oxidation and the Fenton oxidationbefore iron-carbon micro-electrolysis, we choose different concentrations of membrane film and membrane wastewater. In the Fenton oxidation, when COD concentration was775.2mg/L,removal rate was35.71%, and when COD concentration was36720mg/L, removal rate was38.9%. In the Fenton oxidation before iron-carbon micro-electrolysis, when CODconcentration was734.4mg/L, removal rate was66.67%, and when COD concentration was36720mg/L, removal rate was72.22%.In addition, we analyzed the mechanism of Fenton oxidation treatment of DMF andDMAC wastewater with ultraviolet band spectral analysis, and then we concluded that thereaction mechanism of Fenton oxidation treat amide wastewater was Fenton oxygen theamide groups and unsaturated double bond to form easily degradable organic matter andinorganic. The oxidation process is mainly destructs carbonyl and amino bond, and thenoxidizes carbon-oxygen double bond.To sum up, the Fenton oxidation method treats DMF wastewater is feasible, and can beapplied to the actual water. In order to reduce the operation cost, consideration should begiven to deal with the amide wastewater using Fenton oxidation coupling iron-carbonmicro-electrolysis method. In addition, The Fenton oxidation coupling micro-electrolysis canalso be applied to other refractory organic wastewater, In order to find a cheaper and moreefficient wastewater treatment technology.