Effects of rice husk biochar pyrolyzed at different temperatures on compost maturity and greenhouse gas emissions of sheep manure
In order to optimize the technical parameters of synergistic decomposition of sheep manure compost and greenhouse gas emission reduction,rice husk biochar pyrolyzed under two different temperatures were used as compost auxiliary material mixed with sheep manure and edible fungus residues.A 43-day compost experiment was conducted using three treatments.A mixture of sheep dung and edible fungus residues,with a mass ratio of 9∶1,was used as the preparation material.This was treated with BC450 and BC650 by adding rice husk biochar pyrolyzed at 450℃and 650℃,respectively,accounting for 15%of the mass of the compost preparation material.Non-pyrolyzed rice husks with the same volume as rice husk biochar were added to the preparation material for CK treatment.The dynamics of compost temperature,maturation indexes(NH+4-N/NO-3-N,EC value,and seed germination index),and greenhouse gas emissions(CH4,CO2,and N2O)were monitored,and the synergic effects of rice husk biochar pyrolyzed at different temperatures on compost maturation and greenhouse gas emission reduction were analyzed.The results showed that the addition of rice husk biochars pyrolyzed at 450℃and 650℃shortened the time required for NH+4-N/NO-3-N,T value,EC,and seed germination index to reach the recommended values for mature compost.Compared with CK treatment,the decomposition cycles of BC450 and BC650 treatments were shorter by 15.0%and 32.5%,respectively.After sheep manure was stored for 43 days,the comprehensive greenhouse effects of BC450 and BC650 treatments were significantly decreased by 6.56%and 24.36%,respectively,compared with CK treatment.Furthermore,the comprehensive greenhouse effect of the BC650 treatment was significantly decreased by 19.05%compared with the BC450 treatment(P＜0.05).The addition of rice husk biochar has a synergistic effect on the composting maturity of sheep manure and emission reduction of greenhouse gases.It is suggested that rice husk biochar prepared at 650℃is more beneficial.
biocharpyrolysis temperaturesheep manurecompostmaturitygreenhouse gas
万方数据
维普
