Study On Flue Gas Desulfurization By Microorganism

With simple processe, low investment and operation costs , no coal loss and repeated pollution , flue gas desulfurization techniques by microorganism have a lot of advantages for society ^ environment and economy. This study aimed at researching and developing a new flue gas desulfurization technique with more efficiency and low cost. Packing with SRB ( Sulphate Reducing Bacteria ) for treating simulative wastewater with sulphate concentration and packing with CSB (Colourless Sulfur Bacteria) for treating simulative wastewater withsulfides by activated-charcoal, agar, synthesized sorbent--MagneticHollow porous Polystyrenemicrophere(MHP) on Upper-flowing Fluidized Bed Reactor, the experiment results show: Magnetic Hollow porous Polystyrenemicrophere characterized with magnetism , large surface area , easier recovering and flowing, of which the reducing efficiency of SRB in Upper-flowing Anaerobic Fluidized Bed Reactor can reach 96 % , the reducing efficiency rate of CSB in Aerobic Fluidized Bed Reactor can come up to 88.4 %, which was the highest among the three sorbents. Laboratory-scale, the technological process of SO2 absorbing tower-Magnetic Upper-flowing Anaerobic Fluidized Bed Reactor-Magnetic Aerobic Fluidized Bed Reactor-the filtering column sulphur recovery, with ethanol as carbon source, packing with SRB and CSB by Magnetic Hollow porous Polystyrenemicrophere for treating simulative flue gas, it was found that:( 1 ) SO2 absorbing--Sulphate reducing--Biologicaldesulfurizing--Sulphur recovering, the process made up of those fourphases is a new technological process fitting in with flue gas desulfurization.( 2 ) Magnetic Hollow porous Polystyrenemicrophere(MHP) characterized with easier recovering , high efficiency and many advantages, as anew sorbent packing with SRB and CSB, is fit for this technological process.(3) Magnetic Upper-flowing Anaerobic Fluidized Bed Reactor of sulphate reducing phase and Magnetic Aerobic Fluidized Bed Reactor of biological desulfurizing phase in this technological process filled with Magnetic Hollow porous Polystyrenemicrophere(MHP) were economical and actable.(4) In this technological process , N2 amount of lOml/min in sulphate reducing phase, dissolved oxygen content of 2mg/L in biological desulfurizing phase, HRTof6h, experimental temperature of 30 , the SO2 removal efficiency and the sulfur recovery efficiency was maximal for continuous-flow mode.