Analysis on Release Behavior of Sulfur and Chlorine in Low Temperature Gasification Process of Livestock Manure Composts and Application of Solid Residue to Desulfurization and Desalinization

Abstract

Herein, we report on the release behaviors of sulfur and chlorine in the gasification process of livestock manure composts, i.e., pig feces compost (PC) and chicken droppings compost (CC) by pyrolysis under reduction atmosphere at low temperatures (<650°C). The pyrolysis of the composts generates gaseous species, tar and soot, containing sulfur and chlorine. The amounts of sulfur and chlorine released from the composts were dependent on increases of the pyrolysis temperatures. More than 80% of sulfur from PC and 39–56% from CC were released as gas, tar and soot. In contrast, chlorine released after the pyrolysis of PC and CC was less than 20%. This was considered to be mainly due to the chemical forms of sulfur and chlorine in the composts. Furthermore, the CC char, which contained a large amount of calcium, could be applied as the adsorbent for sulfur and chlorine in the gas, tar, and soot released by the pyrolysis of PC. This would be due to interactions of sulfur and chlorine to calcium in the CC char.