Experimental Study On The Treatment Of Emulsion Wastewater From Hot Continuous Rolling Process For Aluminum Plate

Aluminum strip hot rolling is one of the main process of aluminum processing, the oil-water emulsion used in hot rolling of aluminum plate plays an important role, after a certain period of using the emulsion, the emulsion will be deteriorated, the failure of the emulsion is emulsion wastewater. Emulsion wastewater with high concentration of organic matter content and oil content, direct discharge will pollute the environment. Therefore, emulsion wastewater must be treated to meet the national emission standards before they are discharged. In our country, the annual discharge amount of emulsion wastewater from hot continuous rolling mill is 0.57¹.54 million tons, how to deal with a lot of emulsion wastewater to achieve the standard discharge is an important issue in the field of aluminum processing.In this paper, the emulsion wastewater produced by hot rolling process of aluminum plate is studied, the experimental method of static-demulsification and flocculation-Fenton oxidation process treatment of emulsion wastewater treatment process were studied, systematically explores the static links, demulsification flocculation and Fenton oxidation process of each process parameter of emulsion wastewater processing rules of the effect of. Through experimental study are determined by using the technique of emulsion wastewater treatment process each link of the reasonable process conditions, the results showed that of aluminum hot continuous rolling process of emulsion wastewater using static-demulsification and flocculationFenton oxidation process for treatment of emulsion wastewater COD?chemical oxygen demand? concentration can reach 104mg/L, meet the national standard requirements of the secondary emission of COD in wastewater, wastewater after the subsequent biochemical treatment realize safe discharge has created favorable conditions. The specific research contents and results are as follows:?1? Study on the relationship between the thickness of oil layer and change the static time of emulsion wastewater in static process. Results show that the static treatment can remove free oil and suspended oil in the emulsion wastewater, the free oil and suspended oil gradually transformed into oil slick, in a static time 1¹6 minutes and increase the thickness of oil layer, oil layer become darker in color, 16⁹1 minutes and constant thickness of oil layer, oil layer become darker in color, after 1min, thickness of oil layer and color are no longer changes, that emulsion waste water static floating oil suspension and free oil, has been fully realized to the transformation of the oil slick.?2? Study on demulsification process of wastewater after by static processing. Study on the demulsification process of sulfuric acid dosage, reaction temperature and time on the effect of oil-water separation. The results show that the sulfuric acid acidification destroyed the wastewater containing emulsified oil, the emulsified oil part into spontaneous floating free oil and oil suspension, partially transformed to not spontaneous floating oil droplet particles, by measuring the COD of the waste water in the middle layer, it is concluded that the concentration sulfuric acid dosage 15ml/L, the reaction temperature is 50 ?, and the standing time is 180 minutes, COD removal rate reached 48.30%, what is the reasonable technological conditions for the separation of oil and water.?3? Flocculation treatment of static and demulsification of emulsion wastewater. The experimental study of the flocculation process wastewater pH value, flocculant Al2?SO4?3 or FeCl3 dosage of wastewater of oil drop coalescence effect. The results show that the flocculation of FeCl3 and Al2?SO4?3 poly effect to removal in wastewater by emulsified oil into oil droplet particles, Al2?SO4?3 flocculation than FeCl3 in Al2?SO4?3 dosing amount of 4g/L, pH of wastewater value of 7.20, reaction time was 180 minutes conditions, the removal rate of COD reached 85.70%, COD concentration of emulsion wastewater by 8480mg/L reduced to 1212mg/L, wastewater particles oil droplets coalescence of the reasonable process conditions.?4? For static and demulsification and flocculation treatment of emulsion wastewater by Fenton oxidation treatment. Experimental study on the Fenton oxidation with H₂O₂ dosage, FeSO₄·7H₂O dosage and p H value on the removal rate of organic matter in wastewater, COD wastewater characterization in organic matter content, analysis of the separate effects of the factors and interactions. Results showed that H₂O₂ investment quantity than FeSO₄·7H₂O cast dosage and pH value of wastewater COD removal rate was more significant and their influence, combined with wastewater treatment effectiveness and economic considerations, and the pH value is 3.5, the dosages of H₂O₂ dosage 45ml/L, FeSO₄·7H₂O cast dosage of 2g/L obtained, oxidation reaction time 120 min, removal rate of COD reached 98.77%, Fenton oxidation treatment of emulsion wastewater rational technological conditions.?5? By static-demulsification and flocculation-Fenton oxidation process for treating emulsion wastewater, the process are in the reasonable process conditions, can be made of emulsion wastewater COD concentration reached 104mg/L, conform to the national standard secondary emissions of COD in wastewater, wastewater after subsequent biological treatment to achieve safe discharge has created favorable conditions.