Study On The Effect Of Bio-carbon On Chromium In Soil

In this paper,the main soil types of brown soil and cinnamon soil in Liaoning Province were studied.The effects of three dry and wet alternate cycling cycles on soil contamination were studied at different temperatures(300℃,400℃ 500℃)(Corn stover and peanut shell)for 30 days,and the effect of biochar on the transformation of chromium in soil was determined.The results are as follows:1.When the MC300 and MC400 biochar were added to the brown soil,the Cr(VI)in the soil was almost completely reduced,and the reductions were 239 mg/kg and 238 mg/kg respectively.However,when MC500 was added to the soil,The reduction was only 213 mg/kg.When the peanut shell biochar was added to the soil,the reduction of Cr(VI)in the soil also showed a decreasing trend with the increase of the temperature of the charcoal.The reduction effect of adding two kinds of biochar to the cinnamon was the same As the firing temperature of biochar increases,there is a decreasing trend.In the case of brown soil or cinnamon soil,the biochar has a decrease in the reduction of heavy metal chromium in the soil with the increase of the pyrolysis temperature of the prepared biochar due to the biochar from the same material.trend.Therefore,from the perspective of pyrolysis temperature to compare the biochar on the soil heavy metal chromium reduction ability,300 ℃ is a more appropriate temperature.The reduction of 239 mg/kg of MC300 in brown soil was similar to that of PC300 at 238 mg/kg,but with the increase of the temperature of biochar The yield of chromium in corn steak is always higher than that of peanut shell.In the cinnamon soil,the reduction of chromium by corn stalk is always higher than that of peanut shell.The reduction ability of chromium in soil was always stronger than that of peanut shell biochar in the brown soil and in cinnamon soil.Compared with the different carbon production materials at the same cracking temperature,Straw is more suitable for peanut shell than raw material for the reduction of chromium in the soil.The reduction ability of bio-charcoal of corn stalks is better than that of peanut shells.The effect of the difference of pyrolysis temperature of biochar on the reduction ability of heavy metal chromium in soil is not exactly the same in different soils:biochar in pyrolysis at 300℃ in carbon soil and creatures calcined at 400℃ The reduction ability of heavy metals in the soil is not very different,especially for the corn stalk biochar,the two kinds of corn stalks bio-carbon can be all the soil Cr(VI)reduction,but there is a reduction rate of reduction.In the cinnamon soil,the reduction ability of the biochar to the heavy metal chromium decreased gradually and the change rate was very significant with the increase of the pyrolysis temperature of the prepared biochar.The reduction rate showed a tendency of increasing first and then decreasing,but not affecting the chromium Restore the overall effect.In summary,at 300℃,the bio-charcoal was burned at 300℃,and the reduction ability of heavy metal chromium in soil was stronger than that of other biochar in both brown soil and cinnamon soil.Therefore,the most suitable bio-carbon The corn stalks were prepared at 300℃.