| Microelectrolysis technology is a kind of waste water electrochemical treatment method which integrates the primary batteries,oxidation and reduction,flocculation and adsorption,electrochemical enrichment and coprecipitation.It is widely used in the treatment of various industrial wastes.There are some problems about the traditional iron-carbon microelectrolysis such as the compaction and passivation of the filler,the difficulty of replacement and the small difference of iron carbon potential,and the limited ability of pollutant degradation,which leads to some restrictions in the practical wastewater treatment application.Aiming at a series of current problems of iron-carbon microelectrolysis and the characteristics of intractable organic industrial wastewater,the preparation of new manganese-carbon microelectrolytic packing and the treatment of practical organic wastewater were studied.The main results are as follows:(1)Using manganese powder,activated carbon powder,binder(bentonite)and porogen(ammonium bicarbonate)as raw materials to prepare the manganese-carbon microelectrolysis packing by high temperature microporous activation technology.This material belongs to the new porous high activity micro-electrolytic packing.(2)Use the manganese-carbon packing to deal with Hubei Sanning chemical synthetic ammonia industrial wastewater,and set the COD removal rate and BOD5/CODCr as the water quality indexes.The optimum conditions for the preparation of manganese carbon filler were as follows:Mn/C was 1/1,the content of binder was 30%,calcination temperature was 800? and calcination time was 3h.(3)The physical and chemical properties of the the manganese-carbon packing prepared under the optimum conditions were tested and analyzed:manganese carbon filler is spherical,its particle size is between 7?9mm,the apparent density is 2.265g/cm3 and the bulk density is 0.755g/cm3.It also has high compressive strength and good wear resistance.The results show that the filler has a well-developed pore structure,and this material contains the contents of elemental manganese,MnO,Mn7C3,Mn2SiO4,SiO2 and Al2SiO5,which are characterized by SEM,XRD and X-ray fluorescence.The mass fraction of Mn,C,Si,O and Al were 46.38%,32.92%,8.19%,6.88%and 2.46%respectively,and the BET specific surface area of the packing was 191.37m2/g.(4)When using the manganese-carbon packing to deal with synthetic ammonia wastewater which prepared under the optimum conditions,the effect of reaction time,reaction pH value,aeration rate and filler dosage on the treatment effect of manganese carbon microelectrolysis process was investigated.The optimum operating conditions were determined by using manganese carbon filler prepared under the best condition:reaction time is 3h,the reaction pH is 3,the aeration volume is 1200L/h,the packing dosage is 50g/L.At the same time,the stability of the waste treatment was studied when the microelectrolysis process for continuous operation,adding 2g/L of manganese-carbon packing to the reaction system every 24 hours,and the wastewater treatment effect can be maintained at a high level.(5)The removal rate of COD was 71.71%,49.34%,44.08%and 31.58%respectively by microelectrolytic treatment of Mn-C,Mn-Fe-C,Mn-Mn slag-C and Mn slag-C four kinds of packings respectively.The results show that the use of manganese slag waste as a raw material to prepare micro-electrolytic packing is to achieve solid waste of resources and turn waste into treasure.(6)When the late landfill leachate was treated with manganese-carbon packing and the reaction time was 3h,COD removal rate was 75.81%,and the removal efficiency of pollutants was better.(7)Strengthening the manganese-carbon microelectrolysis to treat the synthesis of ammonia waste water and adding NaOH solution to the effluent of manganese carbon micro-electrolysis,the pH value of the effluent was adjusted to 9 when the microbial electrolysis reaction time was 3h.The removal rate of COD was 86.37%,and this indicates that the treatment effect is optimal. |
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