The Research On The Treatment Of Hard-degraded Dye By Three-Dimensional Electric Catalytic And Biological Aerated Filter Coupling Process

Dyeing wastewater with large water volume, high content of organic pollutants, high alkalinity, changeable water quality characteristics, belongs to one of the processing of industrial wastewater.Traditional physical chemical and biological treatment technology have been used for the treatment of dyeing wastewater, but Stains in the dyeing and printing wastewater with high colority, difficult to biodegrade and high toxicity, Conventional wastewater treatment technology can not suitable for meets real time performance. Three-dimensional electrochemical device has the advantages of the high mass transfer efficiency, high current efficiency, not selective for material removal. Biochemical method can effectively remove the organic matter and bad smell in the water, decrease chrome of the wastewater, meanwhile this technology has virtues of high technical maturity, Low running cost, easy operate and management, But biochemical method has selective to the degradation of organic matter, and can not use of the nocuous organics.These reasons restrict the use of biochemical method,so the combination of electrochemical technology and the biological aeration filter and constructed a new type of water treatment technology is very necessary.With steel slag, zeolite, pore forming agent and active ingredient（MnO₂, SnO₂, Fe₃O₄） as raw materials and by the following process steps : Steel slag and zeolite ground into a powder,screening steel slag and zeolite,drying raw material, balling, high-temperature roasting, A new type of particle electrode was made. By experiment measures we find the particle electrode load MnO₂ and SnO₂ has the best removal rate of rhodamine B and the optimal molar ratio of manganese dioxide and tin oxide is 2:1.Next, in the condition of different current intensity, voltage, electrolyte concentration, initial PH, The removal efficiency of rhodamine B has been studied, we find current intensity and voltage is the key factor in the removal of rhodamine B. With the increase of current intensity and voltage value, the removal effect of three-dimensional electrochemical device to rhodamine B would be raised, but electrolyte concentration and initial PH has a little of influence on rhodamine B removal. By XRF, SEM and XRD technology,the antioxidant content, surface structure and crystal structure of the particle electrodes has been studied.The launch stage of two groups of BAF adopt artificial inoculation with activated sludge. It take about 18 days to succeed in cultivating bio-film,and the removal ratio of electric biological coupling BAF to CODcr, ammonia nitrogen and rhodamine B, gets to 87.0%、80.0% and 83.0%. The removal ratio ordinary BAF respectively gets to 65.0%、80.0% and 30.0%. In the stage of continuous running, the influence on CODcr, ammonia nitrogen and rhodamine B concentration of effluent, by Current strength, hydraulic retention time, the main electrode area, has been studied. When current strength is 0.3A, the removal ratio of CODcr, ammonia nitrogen and rhodamine B concentration is 70.9%、81.9% and 70.6%. When current strength is 0.5A, removal ratio is 78.7%、85.3% and 78.2%.As current strength is 1.0A, removal ratio is 88.2%、89.8% and 88.4%. With the increase of current intensity, the removal ratio of electric biological coupling BAF to CODcr, ammonia nitrogen and rhodamine B improved all. When HRT is 2.5h, the removal ratio of CODcr, ammonia nitrogen and rhodamine B concentration is 73.1%、75.6% and 72.8%. As HRT is 3.5h, removal ratio is 78.7%、85.1% and 78.1%; As HRT is 4.5h, removal ratio is 82.4%、91.4% and 85.9%. It is better than ordinary BAF under the same condition. The main electrode area is 0.13m2, the removal ratio of CODcr, ammonia nitrogen and rhodamine B concentration is 81.0%、83.7% and 79.3%. When main electrode area is 0.08m2, removal ratio is 72.6%、82.8% and 60.9%.With the increase of electrode area, the removal effect of CODcr and rhodamine B was improved obviously, but the removal efficiency increase of ammonia nitrogen is not clear enough.The removal of CODcr and rhodamine B mainly concentrated on the front of BAF, and removal of ammonia nitrogen concentrated on the back of the reaction. After backwash of the two groups of reaction device, removal rate of the CODcr, Ammonia nitrogen and rhodamine B all declined, but the time of all indicators recovery is short than hang membrane startup phase, only a few hours. It can illustrate that although backwash can scour the biofilm on the packing, biofilm can fast grow and achieve to stable operation state.