| Chinese crop and livestock production has been developing very fast in line with its industrialization.Large amounts of crop residues,manure and municipal sewage sludge are produced every year.All these wastes will certainly cause environmental pollution and health risks while these waste biomass are not yet treated and recycled properly.For now,straw burning,and a big number of livestock manure free to pileup,industrial waste,waste is simply discarded,although there are straw,such as biogas,biomass production,but there are still quite a few waste biomass has not been effectively addressed.Seeking the utilization of biomass resources is therefore necessary.Relatively low temperature(<700 ?)and partially or completely anoxic conditions,biomass by pyrolysis and charming can form a carbon-rich products of biochar.Biochar with high pH,better pore structure,higher content of surface functional groups and contains a variety of features such as inorganic minerals.Biochar can improve the soil,reduce greenhouse gas emissions and treatment of pollution by heavy metals in farmland.This also solves the problem of biomass waste,achieving a waste of resources.This study is based on agriculture,livestock,and industrial waste.We collected crop straw,animal dung and made of industrial waste residue.Producing biochar with them at 450 ?.Then test their basic properties and contents of heavy metals.Exploring the effect on basic properties of biochars and the application.Here is the result:(1)The straw biochars have high content of K and low ash content.Animal manure carbon have much P and N.There is much P in sludge biochar.(2)A lot of heavy metals in sludge biochar,it is generally higher than the rest of biochars.Wood biochar and sludge biochar have high content of Cd and Pb,so they can not use agricultural area.Animal manure biochars contains a certain amount of heavy metal,and are rich in N and P.So these biochars can use together with crop straw biochars,which have much K. |
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