Refinery Wastewater Reuse Technology

In the study, Fe/Cu micro-electrolysis was used to treat oil refining wastewater, withthe help of chemical flocculation in pretreated treatment and similar Fenton oxidization inadvanced treatment. Several indexes including COD, turbidity, oil and pH could be up tothe water for general use finally.In pretreated treatment, inorganic flocculent PAC and types of organic flocculent wereused to do compounded trial. The scheme 40mg·L^-1 PAC and 1mg·L^-1 anionic FA-200did best, COD removal efficiency could reach 85% and turbidity removal efficiency 90%.This scheme was used to treat ten different refining wastewater, the effect was stable.In Fe/Cu micro-electrolysis trial, the effect of four factors(reaction time, pH,volumetric ratio and concentration) on contamination removal was studied. Based on that,COD-removing and oil-removing orthogonal trial was carried out. The best conditions was:pH 6, react time 30 min, Fe/Cu volumetric ratio 5:1, COD 440mg·L^-1. Made a contrast ofFe/Cu micro-electrolysis with copperized scrap iron micro-electrolysis and Fe/C micro-electrolysis, found that the three all could remove the contamination efficiently on acidicconditions. Efficiency of Fe/C micro-electrolysis decreased rapidly while the other twomaintained high on neutral and alkaline conditions. Treated nine types of wastewater byFe/Cu micro-electrolysis, COD decreased between 180mg·L^-1 and 200mg·L^-1, oildecreased between 7mg·L^-1 and 8mg·L^-1. Retreated the wastewater by Fe/Cu micro-electrolysis, then COD decreased below 100mg·L^-1 and oil below 5mg·L^-1.Similar Fenton oxidization was utilized to do advanced treatment after micro-electrolysis with the help of microwave. COD and oil decreased below 50mg/L and0.5mg/L respectively.