Experimental Study On Sludge-based Activated Carbon For Leachate Treatment By The Unit Of MBR Process

In recent years, with industrial and commercial development, the advancementof technology and the improvement of living standards, coupled with the ubiquity ofthe accelerated aging of the product and waste, solid waste becoming more and moreserious problems which troubled. Since conventional sanitary landfill process willproduce water at the landfill complex high concentration organic wastewater, andhas the risk of secondary pollution, and unable to meet the treatment and disposalrequirements. Membrane bioreactor (MBR) is a new sewage treatment technologywhich combines the membrane separation technology with biological sewagetreatment technology, but the membrane fouling is a serious problem. Adding agiven quantity of powdered activated carbon (PAC) to the membrane bioreactor notonly enhance the processing performance, but also slow down the membranefouling.For landfill leachate water complex and volatile issue, using two sets ofcompletely parallel to the MBR of Harbin some UASB effluent in the landfillprocess. MBR uses microfiltration and adding3.0g/L sludge-based activatedcarbon (SBAC) which is made from the urban municipal sewage sludge to theaerobic zone of one bioreactor. In contrast to the parallel operation under theconditions studied SBAC-MBR and MBR are two processes for landfill leachatetreatment efficiency and membrane fouling characteristics.The results of two membrane bioreactors treating the landfill leachate showsthat, the removal of SBAC-MBR treating TOC, CODCr,UV254, TN, NH4+-N ishigher than the MBR, which is due to SBAC dosing, in addition to organicadsorption of pollutants, but also for the growth of microorganisms provides vectors.However, since the sludge retention time during the experiment is running (SRT) islonger, the two reactors of the removal of TP is little difference. By characterizingthe nature of the sludge mixture, confirming the SBAC-MBR sludge concentrationincreases rapidly, SBAC’s existence enhances the ability of the sludge floc shearforce, increases the sludge particle size, decreases the viscosity of the sludge,reduces the sludge specific resistance and reduces the Zeta potential.Due to the SBAC improved properties of the sludge mixed liquor, makes theformation of structure in the SBAC-MBR a good porosity, permeability filter cakesludge layer and formation rate slows down, extending a transmembrane pressuredrop reaches the specified value (40kPa) needed time, slows down membranefouling and prolongs membrane life cycle. Through the analysis of membrane filtration resistance in two reactors, foundthat the addition of SBAC reduces the membrane pore clogging resistance and theresistance of the cake layer growth rate. Scanning electron microscope image of thenew film after film and pollution also confirmed SBAC dosing cake layer thicknessof the membrane surface becomes smaller and loose structure, slowing themembrane fouling. The two reactors sludge mixture of three-dimensionalfluorescence spectra show, SBAC dosing reduce the content of SMP and EPS in thereactor, thereby reducing the mixture of sludge specific resistance, and thusmembrane fouling.