中文摘要：

为了研究共热解对生物炭中碳氮固定的协同效应,利用管式固定炉开展了不同热解温度（300~700℃）下的污泥与稻秆单独热解及其共热解（泥秆质量分别为1∶3、1∶1、3∶1）试验研究.结果发现,污泥和稻秆共热解并不是两种物料单独热解贡献的简单叠加.共热解对生物炭产率无协同效应,但对固定碳产率的协同性受共热解条件影响较大.在相同热解温度下,1∶3和3∶1泥秆比共热解生物炭中的碳和氮含量协同量化值均明显大于1∶1泥秆比下的协同量化值,碳和氮元素含量协同量化值分别在热解温度和泥秆比为（400℃、1∶3）与（400℃、3∶1）时达到最大值12.43%与40.65%.碳和氮固定率协同量化值随热解温度的升高而增加,最大分别为53.77%~56.13%和38.30%~39.12%,说明共热解可显著提高生物炭中碳和氮元素的固定水平.除3∶1泥秆比共热解生物炭中H/C原子比大于理论值,对降低生物炭的芳香度与饱和度具协同作用外,其他共热解条件下的H/C、（O＋N）/C、O/C原子比均小于理论值,对提高生物炭的稳定性具明显的协同促进作用.污泥与稻秆在泥秆比1∶3、1∶1与3∶1下共热解,提高协同效应的方式分别为促进脱氧去氢反应、去氢反应与脱氧反应.该研究结果可为生物炭在碳氮封存减排中的应用提供新的工艺途径.

英文摘要：

This study compared the sole pyrolysis of sewage sludge （SS） or rice straw （RS） with co-pyrolysis of SS/RS at different mass ratios （ 1：3, 1 ： 1, and 3：1 ） regarding with biochar production, C and N transformations and elemental composition. The pyrolysis were carried out with a tube fixed-bed reactor at different temperatures of 300 ~ 700 ℃. The results indicated that co-pyrolysis of SS and RS was not a simple addition of the individual contribution of the two. Co-pyrolysis of SS and RS had no synergistic effect on the biochar yield. However, the synergistic effect of co-pyrolysis on fixed- carbon yield was dependent on co-pyrolysis conditions. At the same pyrolysis temperature, the values of synergistic effect （As） of carbon and nitrogen contents in biochars from 1：3 and 3：1 SS/RS were significantly higher than those from 1：1 SS/RS. The maximum AC of 12.43% and the maximum AN of 40.65% were observed using a mass ratio of 1：3 SS/RS and 3：1 SS/RS at a pyrolysis temperature of 400 ~, respectively. As the pyrolysis temperature increased, the synergistic effects of co-pyrolysis on C and N fixing increased, reaching a maximum value of 53.77% ~ 56.13% and 38.30%- 39.12%, respectively. This suggested that co-pyrolysis is benefit for fixing C and N in biochar. Except that the atomic ratio of H/C in the bioehar from 3： 1 SS/RS was higher that its theoretical value, the atomic ratios of H/C, （O＋N）/C and O/C were all lower than their theoretical values under other co-pyrolysis conditions （i.e., SS/RS ratio, temperature）. This indicated that co-pyrolysis had evident positive synergistic effects on biochar stability. The synergistic effects of co-pyrolysis of SS and RS were enhanced by deoxygenation and dehydrogenation, dehydrogenation, and deoxygenation when SS/RS was in ratios of 1：3, l：l and 3：1, respectively. The results showed that the effect of carbon and nitrogen fixation in biochar can be significantly enhanced using co- pyrolysis of SS and RS with an optimal mixtur