EFFECT OF SWINE MANURE BIOCHAR ON THE ADSORPTION OF SULFUR IN LIGHT SIEROZEM

Characteristics sulfur adsorption onto swine manure biochar, light sierozem and light sierozem with biochar was investigated by batch adsorption experiments. The results indicate that the adsorption is increased with the increase of pyrolysis temperature and BSM700 is the best. The order of the adsorption capacity of three kinds of adsorbents for sulfur is LS > BSM700+LS > BSM700. The adsorption process of biochar, light sierozem and light sierozem with biochar could be well characterized with Pseudo-second kinetic model, whereas adsorption isotherm results elucidated that Langmuir-Freundlich model provided the best fit for equilibrium date; The Gibbs free energy obtained by thermodynamic calculation is negative, indicating that the adsorption of BSM700, light sierozem and light sierozem with BSM700 on sulfur is spontaneous. The adsorption capacity of the three adsorbents is decreased with the increase of the solution pH, while the coexisting anions have less effect on the adsorption of sulfur by the three.