Application Research Of Leachate And MBR Effluent By Microwave Pretreatment

《Standard for Pollution Control on the Landfill Site of Municipal Solid Waste》（GB16889-2008）has been implemented on July1,2008. The new standard proposedmore stringent requirements for leachate treatment facility effluent. Separate biologicaltreatment facilities can not meet the standard requirements, Advanced treatment,forexample, Membrane treatment must be combined with to achieve the effluentrequirements. The membrane treatment require periodic replacement of membrane module,Expensive replacement costs make prolong the life of water pretreatment membranemodule become an issue of concern; On the other hand, more and more aging landfillleachate also create some difficulties for biological treatment, high ammonia content, lowbiodegradability makes pretreatment before biochemical treatment technology becomescritical. Because of its advantages of fast and efficient,microwave treatment technologyget more and more research in high concentration organic wastewater treatment. In thisstudy,the microwave processing technology will be used in leachate pretreatment andMBR effluent (before membrane treatment influent) pretreatment, expecting to improvethe processing efficiency of the leachate treatment system.In this paper, there will be single factor experiments and orthogonal experiment forleachate and MBR effluent. By BOD5, COD, ammonia nitrogen, Turbidity, and VFApollutant removal rates and biological toxicity etc. indicators, studying the effect onmicrowave treatment of microwave time, microwave power, pH, initial concentration.The main results and preliminary conclusions are as follows:(1) Microwave processing technology for leachate pretreatment: Organic pollutantremoval rates ranged from40%-70%, BOD5/COD>0.3after microwave treatment, theleachate biodegradability improved significantly;(2) Microwave processing technology for MBR effluent treatment: further reduce theconcentration of organic matter, the removal rate between40%-70%, and pollutantindicators have reached the requirements of nanofiltration process. Direct access to thenanofiltration or reverse osmosis system, because of lower concentrations of pollutants, greatly reducing the possibility of clogging of membrane fouling,and could reduce theconcentration of concentrated solution at the same time;(3) Evaluation of treatment effect and the best experimental conditions: By the clusteranalysiscan of SPSS statistical software,we can be obtained that BOD5, COD, ammonianitrogen, Turbidity, and VFA pollutants removal eventually merged into ammonia andCOD removal, Therefore, COD and ammonia nitrogen removal can be used to evaluatethe effect of microwave treatment. In single factor experiment, the optimal experimentalconditions is: microwave power500w, microwave time8min, pH is the liquid pH. Withthe microwave treatment time, microwave power increases, BOD5, COD, ammonianitrogen, Turbidity, and VFA removal increased, biological toxicity decreased; With theleachate pH increases, there is a certain increase of ammonia removal, the rest of theremoval rate decreased slightly, biological toxicity did not change significantly; Leachateinitial concentration was less affected;(4) Processing conditions affect order Rating: By the regression analysis of SPSSstatistical software and range analysis,the effect order of the leachate treatment conditions:Microwave time,microwave power,pH,initial concentration.Microwave time andmicrowave power have a significant effect on the removal rate, and is positive correlation.