The Gas Formation Properties And Contaminants Precipitation Mechanism Of Municipal Organic Wastes Pyrolysis

Compared with incineration, landfill and biological treatment technology,pyrolysistechnology has obvious advantages in volume and quantity reduction, resourceutilization, and small pollution emerging, so it is getting more and more attention.Biochar technology can not only increase carbon storage、 serve as soil activeconditioners and improve soil fertility when stored in soil, it has significant effect tomaintain soil ecosystem balance and mitigate global warming. But for municipalorganic waste pyrolysis for biochar, product distribution, gas emissions characteristicsand mechanism of pollution emissions still lack of basic research. So in view of theabove problem, the pyrolytic experimentwas designed to study the city organic wastepyrolysis characteristics under the different terminal pyrolysis temperature, using argonas carrier gas. Main research object of this article were as following, first, thedistribution of the pyrolytic products under different terminal pyrolysis temperature insolid, liquid, gas phase, second, gas emissions characteristics of single and mixturecomponent of city organic waste in pyrolysis, the last, HCl, NH3, H2S emissionscharacteristics under different terminal pyrolysis temperature. The purpose is to find thebest temperature of pyrolysis for biochar control condition and provide theoretical basisfor the city organic waste pyrolysis technology application and biological carbonsequestration technology application. Through the experimental study, conclusions weredrawn as follows:①The terminal temperature changes between500~800°C, Solidproductionreduced from39.33%to39.33%，But the decreasing trend gradually slowdown; Liquid production rate first to climb up and then decline,at500°C was26.40%,700°C to peak32.07%, at700°C to31.50%;Gas products keep increasing, increasedfrom34.27%to37.30%.The early stage of the gas production mainly comes from thedecomposition of raw materials, after700°C mainly comes from the secondarypyrolysis of oil.②The terminal pyrolysis temperature will promote municipal organic waste asecond pyrolysis of the first pyrolysis products.③When the terminal pyrolysis temperature changes between500~800°C, theimprovement of the terminal pyrolysis temperature has no significant impact on NH3exhalation rate.but when the terminal pyrolysis temperature is700°C, biochar has agood fixation effect on N; And H2S and HCl exhalation rate is increased with the increase of the terminal pyrolysis temperature, but biachar in different terminalpyrolysis temperature didn’t shown obvious fixation on S or Cl.④Mixed pyrolysis of MSW is advantageous to the precipitation of NH3, and forthe precipitation of H2S, HCl has inhibitory effect.⑤Through the experimental study on pyrolysis of municipal organic waste, thebest pyrolysis temperature which could reduce the NH3and H2S, HCl exhalation rateis700°C,500°C and500°C respectively.