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Research On Pretreating High Concentration Industrial Wastewater By Iron-carbon Microelectrolysis-Fenton Reagent Process

Posted on:2009-02-04Degree:MasterType:Thesis
Country:ChinaCandidate:D L LiuFull Text:PDF
GTID:2121360275461078Subject:Applied Chemistry
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This article researched on the processing method of low cost and high effect, in view of the characters of industrial wastewater, such as high concentration organics, chroma, toxicity, complicated components, refractory degradation and so on. Finally achieved anticipated result.Iron-carbon micro-electrolysis has the advantages of wide application, good processing effect, long life and low cost, and using the waste iron fillings for raw materials without consumption of electric power resources, so it has the significance of making of waste circularly. But the shortcoming is to difficult to deal with refractory organics. However, Fenton reagent is effective to refractory organics, but it requires Fe2+ and H2O2, the cost is high. If the two methods used together, Fe2+ produced by micro-electrolysis is used for the following Fenton process, it may reduce the cost to a great extent and achieve the desired effect simultaneously, it caters people's favor.In this paper ,the object are medical intermediate wastewater and DMSO wastewater (including refined alkaline wastewater and synthetic wastewater). The principles, characters, influence factors as well as application in treating high concentration industrial wastewater of iron-carbon micro-electrolysis and Fenton reagent process were studied. Inspected pH value, reaction time, ratio of carbon and iron ,dosage of iron in micro-electrolysis and pH value, reaction time, dosage of H2O2 and other factors in Fenton process on the removal rate of COD, thus determined the optimal operating parameters, and under this condition, studied the biochemical performance.The results showed that:It was practicable to pretreat medical intermediate wastewater and DMSO wastewater by joint use of iron-carbon microelectrolysis - Fenton reagent process.(1) To medical intermediate wastewater, the removal rate of COD in effluent is 66.03%, the chroma falled from 105 to 18,the biodegradability rised from 0.21 to 0.46, so it was convenient for the following biological treatment. The optimal operating parameters are: micro-electrolysis's pH value is 2.0 and maintains constant, quality ratio of carbon versus iron is 1.5, the dosage of iron is 1.5%, reaction time is 4h;Fenton's pH value is 3.0-5.0,the dosage of H2O2 is 5mmol/L, by dropping way, reaction time is 2h.(2)To refined alkaline wastewater, the removal rate of COD in effluent is 64.59%, the chroma falled from 80 to 8, The optimal operating parameters are: micro-electrolysis's pH value is 2.0-3.0 , quality ratio of carbon versus iron is 1.0, the dosage of iron is 1.0%, reaction time is 4h;the dosage of H2O2 is 5mmol/L, by dropping way, reaction time is 1h.(3)To synthetic wastewater, the removal rate of COD in effluent is 72.14%, CODCr dropped from 143,145mg/L to 39876mg/L.The optimal operating parameters are: micro-electrolysis's pH value is 3.0, quality ratio of carbon versus iron is 1.0, the dosage of iron is 1.0%, reaction time is 4h;the dosage of H2O2 is 8mmol/L, by dropping way, reaction time is 2h.As a large number of volatile methanol included in synthetic wastewater, distillation can be used before microelectrolysis-Fenton reagent treatment, CODCr from 143,145 mg/L dropped to 5531 mg/L, the total removal rate reached 96.14%, but investment in equipment is high and energy consumption increases, the factory may choose a suitable method according to the actual situation.(4) To mixed wastewater composed of refined alkaline wastewater and synthetic wastewater by a certain percentage, the removal rate of COD in effluent is 82.80%, better than treated alone obviously. In summary, iron-carbon microelectrolysis-Fenton reagent process is characteristic of wide application,high COD removal rate,low running cost,simple equipment,small occupation of land,easy operation,so it has high application value.
Keywords/Search Tags:micro-electrolysis, Fenton regent, removal rate of COD, industrial wastewater
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