Characterization of Aqueous Phase Products of Co-Hydrothermal Liquefaction of Municipal Sludge with Microalgae
Municipal sludge(MS),as a waste product of urbanization,is a new challenge for urban development,environmental protection,and resource reuse.Co-processing of MS with microalgae can improve the physicochemical properties of biofuels and increase energy efficiency.In this paper,a co-hydrothermal liquefaction experiment of MS and microalgae was carried out to investigate the trends of the aqueous phase product properties,including chemical oxygen demand,total nitrogen,and ammonia nitrogen by regulating the reaction temperature,reaction time,biomass/water ratio,and sludge/biomass ratio.The best hydrothermal reaction conditions were simulated and optimized by determining the physicochemical properties of the aqueous phase.The results show that the response surface model fits for the characteristics of chemical oxygen demand,total nitrogen,and ammonia nitrogen in the aqueous phase.Among the four operational parameters,the biomass/water ratio and sludge/biomass ratio have the greatest impact on the aqueous phase characteristics.Specifically,at a reaction temperature of 341.44℃,a reaction time of 37.81 min,biomass/water ratio of 0.08 g/mL,and sludge/biomass ratio of 0.653,the lowest levels of chemical oxygen demand,total nitrogen,and ammonia nitrogen content in the aqueous phase can be achieved.
municipal sludgemicroalgaeco-hydrothermal liquefactionaqueous phase
万方数据
维普
