Research On The Treatment Of Dyeing Wastewater By New Type Combined Ceramic Membrane Reactor

As China's rapid development of the textile industry,textile and dyeing wastewater on the problem of environmental pollution has become more prominent.According to the urgent demand of deep treatment in dyeing wastewater,this paper studied the advanced treatment of dyeing wastewater by new type combined porous ceramic membrane reactor,which include the new type moving bed bioreactor and porous ceramic technology.And it gave reference to application in project.It also studies the running condition in treating dyeing wastewater and the running efficiency as well.The permeating flux,COD_Cr,NH₄-N,chroma and TDS were measured during experiments.The new type moving bed bioreactor was the first treatment step of the whole reactor,the experimental results showed the optimal operation condition is following:the HRT was 20h,the filling percentage was 50%,the aeration was 0.55m³/h,and the reactor run in ambient temperature.The filter module was made up of filter cloth with pore aperture of 0.15mm,and its filtration area was 0.03m².In this condition the COD_Cr and chromaticity removal efficiencyes can respectively reach up to 85%and 90%,and system keep stable.According to permeating flux and removal rate of COD_Cr,affecting factors were mainly discussed.In this paper,porous ceramic membrane in deep dyeing wastewater treatment carried out basic research,experimental analysis of the results through the choice of a reasonable operating conditions for the porous ceramic membrane technology dyeing wastewater handing the practical application of some basic data.The experiments show that the use of 0.275MPa transmembrane pressure,the membrane surface velocity 2.5m/s COD_Cr and ammonia nitrogen removal more efficient and can maintain greater flux,if the water input to the original 0.5g/l kaolin can effectively improve the efficiency of COD_Cr removal.The fouling mechanism was also investigated.According to resistance analysis,the reversible pollution was the main part of total pollution,which could be removed by physical cleaning.The flux was most sensitive to the crossflow velocity,the portion of Rp to the total resistance was decreasing with the decrement of CFV,which related to the thickness of concentration polarization layer.The membrane's external pollution was the main cause of flux decay.Also according to SEM analysis,the foul mechanism was the blockage of pollutant on the fenestra of ceramic membrane and the cake formation.To the ceramic membrane,with the physical cleaning,artificial cleansing and anti-pressure washing,it can have a return to the original flux of 40 percent, followed by a 1%sodium hypochlorite clean water seepage flux can be restored to the original 80%.