| Azo dye wastewater with heavy colority and huge volume,the distribution of a wide range of changes in water quality,a high content of organic toxins and nonbiodegradable industrial waste water,which is difficult to deal with.Most of the existing biological treatment methods low processing efficiency,the large amount of excess sludge,water treatment chemicals,large amount and high operating costs.Thus the study of high efficiency and low cost method of dye wastewater bio-treatment has momentous significance.Bio-electrolytic technology is a new water treatment biotechnology.Within the reactor,electrochemical reactions and microbial reactions is coupled together,so that the two reactions play the respective strengths at the same time,to achieve process complementary and treatment effect strengthening purposes,in order to achieve the purpose to improve the reaction efficiency,reduce equipment investment.The experiment researchs current density,hydraulic retention time of bio-electrochemical hydrolysis reactor and dye concentration of bio-electrochemical hydrolysis-acidification and aerobic biological contact oxidation Processing azo dye reacting brilliant red X-3B effect impact.By comparing the effect of azo dyes wastewater treatment under the conditions of various factors,determine the best current density,hydraulic retention time and suitable dye mass concentration of bio-electrochemical hydrolysis-acidification and aerobic biological contact oxidation processing azo dyes.Studing how the electric field impact microbialIn bioelectrochemical hydrolysis reactor,there were iron sheet as anode,and graphite column as the cathode.Inside of hydrolysis reactor and contact oxidation reactor placed the filler used to fix biofilm.The electric current density used in this bioelectrochemical hydrolysis experiment were 0.048,0.072,0.096,0.120 mA·cm-2,HRT were 8,9.2,11,12h,Dye concentration were 50,60,70,85,100 mg/1.The test results show that the electricity-biological hydrolysis reactor of hydraulic retention time 12h,processing average concentration 47.10 mg/1 azo dyes wastewater,at the current density 0.096 mA·cm-2 working best,with average removal rate of the dye concentration 96.37%,color removal 73.48%.Increasing the current densityto0.120 mA·cm-2 the removal did not continue to increase.Bio-electrochemical system dye concentration average removal rate 99.06%,color removal 85.03%.The current density is less impact on the average removal rate of CODCr for biological hydrolysis reactor and electricity-biological system.The current density 0.072 mA·cm-2 the electricity-biological system with the highest removal rates was 30.81%.The bio-electrochemical reactor at the average concentration of the current density 0.096 mA·cm-2,processing 49.62 mg/1 dye wastewater,hydraulic retention time more than 9.2h,the average removal rate of the dye concentration 97.63%,chroma average removal rate around 70%,and the hydraulic retention time 9.2h?12h has little effect to bio-electrochemical reactor.Hydraulic retention time 8h,bio-electrochemical reactor average removal rate of the dye concentration 79.75%,removal rate of chroma 44.99%.Hydraulic retention time treatment of azo dyes wastewater effect impact on electricity-biological system to exhibit similar properties with bio-electrochemical reactor,hydraulic retention time more than 9.2h,dye concentration degree average removal rate of more than 99.86%,chroma average removal rate of about 90%,Hydraulic retention time 8h removal of dye concentration and chroma decreasing,with removal rates were 86.39%,67.93%.With the increasing of the Dye concentration,the removal of dye concentration for bio-electrochemical reactor and electricity-biological system reduced,effluent dye concentration increased.Bio-electrochemical processing the dye concentration 47.26 mg-L-1,dye concentration wastewater average removal the highest rate up to 99.09%,chroma average removal rate of 87.82%,and the average the dye wastewater of the dye concentration 99.36mg/l the removal rate as low as71.23%.The Electric-biological coupling processed dye concentration 99.36mg/l,with the worst treatment effect,effluent average concentration6.69mg/l,chromaticity 57.37 degree.Removal capacity of bio-electrochemical sydrolysis for azo dye was significantly higher than the biological hydrolysis.Biofilm scanning electron microscope results showed that the biofilm structure-The biological coupled system reactor complex,a large number of micro-organisms,the biological phase richer.Bio-electrochemical hydrolysis-acidification and biological contact oxidation Processing azo dye reactive brilliant red X-3B,current density of bio-electrochemical reactor using the 0.096mA · cm-2,the hydraulic retention time of 9.2h,dye concentration should be lower than 85mg/l. |
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